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This Technical Data Sheet includes a compilation
of commonly used terms, and may not be
considered complete from an industry viewpoint.
• The terms and definitions are not universal.
Variations within the industry may exist with
regard to
precise meaning.
3-Hole Adjustable Clip: See
3-Hole Cable Clip
3-Hole Cable Clip: Metal clip
tied to end of extension spring cable to allow
length adjustment
3-Hole Cable Connector: See
3-Hole Cable Clip
Accent Moulding: Half-round and
square mouldings that provide a distinctive mode
of expression to doors
Access Door: See Pass Door
Active Coils: The number of
working coils in a torsion spring
Adjustable Cone: See Winding Plug
Adjustable Sleeve: See Winding
Plug
Adjusting Rod: See Winding Rod
Adjusting Spring Cone: See
Winding Plug
Aero Cable: See Aircraft-Type
Cable
A-Frame: Support member used to
fasten torsion spring assembly of a vertical lift
door to the wall above the
door opening
Air Infiltration: The leakage or
passage of air through a door system
Aircraft Cable: See Aircraft-Type
Cable
Aircraft-Type Cable: Several
strands of galvanized wire rope braided together
Anchor Cone: See Stationary Cone
Anchor Plug: See Stationary Cone
Angle Brace: Lateral brace
attached to back hang and roof construction or
ceiling
Angle Iron: Length of L-shaped
steel material generally used to support and brace
rear of horizontal tracks
from roof construction or ceiling
Angle Mounted Track: A method of
fastening vertical track to a door jamb using a
full height continuous
angle
Anodize: A hard non-corrosive
oxide film on the surface of aluminum
Astragal: See Bottom Weatherseal
Astragal Floor Rail: See Bottom
Weatherseal
Astragal Retainer: See Bottom
Weatherseal
Automatic Latch: An automatic
door locking device
Automatic Opening Device: Quick
opening mechanism recommended for installations
requiring rapid
automatic door opening without use of an electric
operator
Back Hang: Hanger fabricated from
angle iron, which attaches the end of the
horizontal tracks to roof
construction or ceiling
Backroom: Horizontal distance
measured into a building from the face of the
header above a garage door
opening to the first obstruction at the required
headroom
Ball Bearing: A load bearing
device that uses trapped rolling balls to reduce
rotating friction
Ball Bearing Drum: Counterbalance
drum with a ball bearing for smoother operation of
heavier doors
Bar Joist: A lightweight truss
adaptable for the support of roof decks
Bead: A strip of metal, vinyl, or
rubber used to secure glass around the periphery
of a pane
Black: Color-marking convention
to mark parts as Right Side, Left Wound
Blind Rivet: A type of fastener
that mechanically joins two pieces of material
together by means of a riveting
tool
Booster Spring: Additional
spring, usually an extension spring, provided to
compensate for weakened
counterbalance
Bottom Bracket: See Bottom Corner
Bracket
Bottom Corner Bracket: A
structural support located on the bottom section
that holds track rollers and may
also provide for attachment of lifting cables
Bottom Corner Fixture: See Bottom
Corner Bracket
Bottom Fixture: See Bottom Corner
Bracket
Bottom Rail: The lower-most
horizontal rail of a door section
Bottom Roller Bracket: See Bottom
Corner Bracket
Bottom Weatherseal: Weatherstrip
attached to the bottom rail of a door to seal
against the floor
Bow: Condition where a garage
door bottom rail of a wood door is not level or
straight, which is characterized
by a closed door gsmilingh (corners turned up)
Box Strut: See Strut
Bracket Mounted: Method of
fastening vertical track to jamb using angle
brackets
Bracket-Mounted Track: See
Bracket Mounted
Breakaway Track: See Angle
Mounted Track
Breakstem Rivet: See Pop Rivet
Broken Cable Device: A bottom
fixture intended to prevent a door from falling in
the event of cable breakage
Bushing: A fixed or removable
lining used to constrain, guide, or reduce
friction
Cable: See Aircraft-Type Cable
Cable Clamp: Manufactured device
used to secure two pieces of cable to each other
Cable Drum: Grooved drum, fitted
on torsion spring shaft, onto which lifting cable
is wound when door is
opened
Cable Drum Set Screws: Normally
refer to set screws that attach the drum to the
shaft/tube. One screw may
secure the cable to the drum in order to secure
proper cable length.
Cable Length: Specific amount of
cable required to properly operate door
Cable Safety Device: A bottom
fixture designed to slow or stop the descent of a
door in the event of a cable
breakage
Cable Stop: A swaged fitting at
the end of the cable to prevent slippage through a
slot in a drum
Cable Stopping Device: See Broken
Cable Device
Cam: Rotating piece that
transfers rotary motion into linear motion
Cam Tube: Tube encasing a torsion
spring assembly that imparts axial force
Carry-Away Post: A type of
removable center post
Ceiling: Top horizontal surface
in the interior of a garage
Center Bearing Bracket: A bracket
that houses a shaft bearing and aligns and
supports the torsion shaft and
spring(s) assembly. Also serves to anchor
stationary cone(s) to header
Center Bearing Plate: A plate or
bracket that can house a shaft bearing and is used
to align and support the
counterbalancing mechanism to the torsion shaft as
well as anchor one end of torsion springs to the
header.
containment Cable: A cable
threaded through an extension spring to retain the
spring if it breaks
Continuous Angle: See Reverse
Angle Mount
Continuous Angle Mount: See Angle
Mounted Track
Contour Track: Horizontal track
that follows the contour of roof construction or
ceiling
Corner Bracket: See Bottom Corner
Bracket
Corner Burn: A full-scale fire
test performed in a specially constructed room,
where the ignition source is
located in the corner of that room, adjacent to
the garage door
Cotter Pin: A half-round metal
strip bent into a pin, whose ends can be flared
after insertion through a slot or
hole
Counterbalance: To oppose or
balance with an equal weight or force
Counterbalance Shaft: See Torsion
Shaft
Counterbalance System: A system
which counteracts the weight of a garage door to
allow a reduced force to
open and close the door
Counterbalance Tension: See
Counterbalance
Counterweight: Design of door
mechanisms using weights instead of springs to
counterbalance door weight
Counterweight Balancing System:
See Counterweight
Coupler: A device to connect two
counterbalance shafts together, end-to-end
Coupling: See Coupler
gCh Strut: See Strut
C-Value: Heat rate flow through
an insulating material when there is a temperature
difference from outer to
inner surfaces; not normally used in conjunction
with thermal transmittance through garage doors
Cycle: One complete cycle of a
door beginning with the door in the closed
position, then moving to the open
position and back to the closed position
Cylinder: The part of a key
operated lock that accepts the key and contains
the locking pins
Daylight Opening: Opening
dimensions taken between face of jambs and between
floor and header
DC: Door opening size
designation, denoting gdouble carh
Dead Coils: The number of coils
rendered inactive by the spring plugs
Dead-End Cone: See Stationary
Cone
Dead in the Head: The lack of
counterbalancing when the door is in the open
position, failing to keep the door
fully open
Dead Load: A static applied load,
or a load without movement, generally referring to
the weight of the door
Decal: A template of information
attached to a garage door, or in its vicinity, to
convey relevant information
concerning the garage door system
Decorator Angle: See Jamb Angle
Depth: See Backroom
Design Wind Load: Horizontal
design load applied to a garage door based on such
factors as wind speed,
building height and door horizontal location
Direct Drive Chain Hoist: See
Chain Hoist
Disconnect Chain: Used in
conjunction with industrial door operators to
disengage operator and permit manual
use of emergency hand chain to facilitate
operation of door in event of power failure
Disconnect Hoist: See Disconnect
Chain
Door Casing: The framing members
with which a door opening is finished
Door Check: A mechanical device
to insure the self closing of a pass door or
wicket
Door Closer: A device, combining
in one case, a spring to close the door, and a
checking arrangement to
prevent slamming and to insure silent closing
Door Frame: The frame into which
the door fits; consists of two door jambs, and a
door header
Door Framework: See Door Frame
Door Guide: See Track
Door Header: The upper part of a
door frame, consisting of the head jamb, head
casing, stop and trim molding
Door Jamb: The upright framing on
each side of the door opening
Door Moulding: See Door Casing
Door Opener: See Electric
Operator
Door Opening: See Daylight
Opening
Door Operator: See Electric
Operator
Door Path: See Trajectory
Door Schedule: A list of door
sizes, locations and special requirements shown on
a construction document
Door Section: A single segment of
a sectional door
Door Size: Door dimensions
characterized by the width first and the height
second
Door Stop: See Stop Mould
Door Travel: See Trajectory
D Shaft: A torsion shaft
manufactured with a flat area allowing minimum
rotation of affixed hardware.
Double Door: Commonly used to
refer to larger width doors used on two car
openings
Double End Stile: When a door
section utilizes two stiles adjacent to each other
on each end of the section
Double Glazing: Use of two
thicknesses of glazing within an opening to
improve insulating value and/or reduce
sound transmission
Double Low Headroom Track: See
Double Track Low Headroom
Double Shaft: Double torsion
spring shaft used when additional space is
required to accommodate
counterbalance spring lengths
Double Strength Glass: A grade of
window glass lighter than plate glass and usually
1/8h thick
Double Thick Glass: See Double
Strength Glass
Double Top Roller Fixture:
Fixture used at the top section consisting of two
top brackets to incorporate a
longer roller shaft. Usually requires double end
stiles on top section
Double Track Low Headroom:
Addition of second pair of horizontal tracks to
reduce the high point of travel
of top section and permit door being mounted in
area with minimum headroom facilities
Dowel: Wooden pin for fastening
wood usually glued in between stiles and rails to
strengthen a joint
Drawbar Operator: Electric
operator which mounts above the door in the
horizontal position and lifts door by
pulling and pushing the top section. For normal
headroom and low headroom doors
Drip Cap: A projection over the
head of a door opening, or on the top of a wall,
to throw water clear of the
building
Drip Lap: An angled weather seal
provided between sections on steel doors in lieu
of a rabbeted joint to
prevent entrance of the elements
Driveway Post: Post mounted
adjacent to a residential driveway to provide
exterior location for key switch to
actuate an automatic door operator.
Drop-Off Weight: See
Counterweight
DSB: Acronym for Double Strength
Grade B Glass
Duplex Spring: A combination of
two torsion springs of different diameters
telescoped within spring fittings
Eased Edge: Rounded and sanded
meeting rail edge
Eased Off: See Eased Edge
Eave Height: Height measured from
the floor to the underside of an eave
Edge Grain: Wood in which the
rings form an angle of 45 degrees or more with the
surface of the pieces
Edge Hinge: See Graduated Edge
Hinge
Electric Opener: See Electric
Operator
Electric Operator: An
electrically-powered device to control the opening
and closing of a door
Electrical Interlock: Interlock
to prevent door operation by an electric operator
under certain conditions
Embossed Door Section: Door
section featuring embossed panels
Embossed Panel: Panel containing
surfaces raised in relief from a flat surface
Embossed Rosette: Special
ornament or design accessory made of wood,
hardboard or aluminum with designs
raised in relief from the surface
Embossed Section: See Embossed
Door Section
Embossed Steel Door Section: See
Embossed Door Section
End Bearing Plate: Plate commonly
used on torsion spring counterbalance units, which
includes a ball bearing
to support radial movement of a torsion shaft at
each end
End Bearing Support: See End
Bearing Plate
End Bracket: See End Bearing
Plate
End Hinge: See Graduated Edge
Hinge
End Roller Hinge: See Graduated
Edge Hinge
End Stile: Stile located at each
end of a door section which provides for
attachment of graduated edge hinges
End Stile Lock: See Inside Lock
End Stile Sealing Strip: Foamed
plastic strip to seal sections at end stiles of
steel and fiberglass doors
Escutcheon: A plate surrounding
the lock mechanism on outside of door
Exhaust Port: Opening in bottom
section to accept hose to vent tailpipe exhaust
Extension Spring: Provides power
or tension by stretching or pulling, and is
usually mounted along the
horizontal section of track extending from front
of door opening to the back hang
Exterior Lock: Keyed lock on
exterior of the door
Extrusion: Fabricated shapes made
by forcing hot aluminum, or plastic, billets
through a die in an extrusion
press
False Louver Molding:
Special angular shaped molding that gives an
appearance of a slatted panel when fitted
together
Ferrule: Metal ring or cap
which is affixed to a cable by compressing so as
to form a button or loop on the end
of the cable
Finger Joint: Joint used
in joining lumber together at ends of lumber
pieces
Finish Moulding: See Stop
Mould
Plastic Muntin: See
Muntin
Pocket Wheel: A wheel or drum
machined to receive the individual links of a
chain; used to directly transmit
power
Pop Rivet: See Blind Rivet
Pounds Pull: Unit of force
determined by dividing the torque by the moment
arm of the drum
Power Unit: A complete torsion
spring assembly consisting of springs, shaft,
winding plugs and stationary
cones, drums and cables
Pre-Finished: Finish
characterized by galvanized steel painted with a
primer, then given an oven-baked top
coat
Pre-Painted: See Pre-Finished
Prime: To lay on the first coat
of primer paint
Prime-Painted: Coated with primer
paint
Pull Down Rope: A rope connected
to the bottom bracket; used to manually pull the
door down
Pull Rope: See Pull Down Rope
Pull Type Spring: See Extension
Spring
Pulley: A wheel turning around an
axis and having a groove on its rim in which runs
a cable, chain, or rope
Pulley Clevis: See Sheave Fork
Punched Angle: See Angle Iron
Punched Angle Brace: See Angle
Brace
Punched Angle Iron: See Angle
Iron
Punched Angle Track Hanger: See
Back Hang
Purlin: A horizontal roof member
spanning between beams and trusses to which
roofing is attached; commonly
used in a pre-engineered, industrial type building
Push Down Spring:
Spring-activated push rods mounted on horizontal
tracks to start door down during closing
portion of door cycle; generally used with a
jackshaft-type operator or a manual chain hoist
Pusher Bumper: A leaf spring in
place of a rod
Push Nut: Stamped metal fastener
design to be pushed onto a shaft instead of a
typical threaded nut
Quarter Grain: See Edge Grain
Quarter Round: Molding showing a
quarter circle in its cross section
Quarter Turn: A unit of turn
measurement when winding tension into a torsion
spring
Quick Turn Bracket: See Low Lift
Hardware
Radial Force: A force generated
from the center of an object toward the outside
Radius: See Horizontal Radius
Radius Track: See Horizontal
Radius
Rail: Horizontal member of a
section
Rain Ledge: See Rain Stop
Rain Stop: Ledge provided at the
point where the bottom rail meets the floor to
prevent water from running
under the door and allowing for runoff of the
water onto the drive or approach
Raised Panel: See Panel
Rate of Rise: Measurement of
change per revolution of a drum's moment arm
Rear Mount: When the
counterbalance system attached to the rear of the
horizontal tracks
Rear-Mounted Torsion: See Rear
Mount
Rear Track Hanger: See Back Hang
Red: Indicates color for Left
Side, Right Wound
Regular Angle Mount: See Angle
Mounted Track
Removable Center Post: Post/track
assembly which substitutes for door jamb in wide
door openings so that
multiple doors may be used instead of a single
large door, and which can be released and carried
from an
opening
Removable Jamb Wall: Wall
designed to allow the use of two or more doors in
a single opening with carry-
away aluminum center posts that can be removed
when doors are in up position
Removable Mullion: See Removable
Center Post
Removable Post: See Removable
Center Post
Residential: A sectional overhead
type door which is intended for use in a
residential garage, and normally
operated less than 1,500 cycles per year
Restraining Cable: See
Containment Cable
Return: See Sideroom
Reverse Angle: See Reverse Angle
Mount
Reverse Angle Mount: An gLh
shaped angle with the wall leg toward the door
opening used to connect the
vertical track to the jamb. Used in low headroom
and sideroom restricted garages as well as lap
joint.
Rigid Strut: See Strut
Rigid Truss: See Strut
Roll-Away Post: See Removable
Center Post
Roller: See Track Roller
Roller Assembly: See Track Roller
Roller Bracket: A device that is
mounted to a door section and holds a track roller
Roller Stem: See Track Roller
Rounded Off: See Eased Edge
RSLO: Acronym for gright side
looking outh
R-Value: Thermal resistance
value; inverse of U-Value
Safety Bottom Bracket: See Broken
Cable Device
Safety Bottom Corner Bracket: See
Broken Cable Device
Safety Bottom Fixture: See Broken
Cable Device
Safety Cable: See Containment
Cable
Safety Spring Containment: See
Containment Cable
Safety Spring Containment Kit:
See Containment Cable
Sash: The framework which holds
the glass in a window or door
Sash Muntin: One of the rabbeted
bars into which glass is fitted in a sash
containing two or more lights
SC: Door opening size
designation, denoting gsingle carh
Scarf Joint: Method of joining
pieces of lumber together by gluing and pinning
with wood dowels
Scribing: Cutting a door bottom
rail to match the contour of the floor
Scutcheon: See Escutcheon
Section: Garage door component
that extends the full width of an opening; usually
joined together by hinges
Section Joint Meeting Rail Seal:
A weather seal between door sections
Section Joint Meeting Rail Type Seal:
See Section Joint Meeting Rail Seal
Sectional Door: See
Sectional-Type Door
Sectional-Type Door: Door made of
two or more horizontal sections hinged together so
as to provide a door
capable of closing the entire opening and which is
by means of tracks and track rollers
Servicing: See Maintenance
SG: Refers to gsingle glazedh
Shaft Bearing: A bearing that is
used to maintain torsion shaft alignment and
reduce friction
Sheave: A metal or plastic pulley
that is designed to guide the cables employed in a
counterbalance system
Sheave Fork: A yoke type device
used to attach the sheave to extension springs
Shoe Molding: See Quarter Round
S-Hook: Hardware device used to
connect an extension spring to a pulley. These are
also used with other door
related hardware (i.e. chain on locks)
Shop Drawings: Drawings provided
by the manufacturer or door supplier to the
architect-engineer showing the
plans, sections, elevations, and details of the
work required, submitted to assure proper
interpretation of
the intent of the architectural drawings
Side Bearing Plate: See End
Bearing Plate
Side Seal: See Stop Mould
Sideroom: A horizontal
measurement from each side of the door opening,
outward to the nearest obstruction
Single Door: Commonly used to
refer to smaller width doors used on one car
openings
Single Strength Glass: See Single
Thick Glass
Single Thick Glass: A type of
sheet glass used in glazing sashes
Slant: The pitch of a roof
Smile: See Bow
Snap Latch: See Automatic Latch
Solar Glass: A type of tinted
glass
Special Door: Non-standard door
which must be custom manufactured and/or specified
Specifications: A detailed
statement of the quantity and type of material to
be used in the construction of a
garage door system
Splice Plate: Plate used for
attachment of track at the junction of tracks in
clip type angle mounted track
Spring Anchor: See Center Bearing
Bracket
Spring Anchor Bracket: See Center
Bearing Bracket
Spring Anchor Cone: See
Stationary Cone
Spring Anchor Plate: See Center
Bearing Bracket
Spring Assembly: See Torsion
Spring Assembly
Spring Assembly Closed Wound: A
coiled torsion spring with no gaps between the
coils
Spring Assembly Open Wound: A
coiled torsion spring with equal gaps between each
coil
Spring Balance: The amount of
turns needed to counterbalance the weight of the
garage door
Spring Bumper: Spring mechanism
mounted on horizontal track that eases the door to
stop in its upward travel
to reduce shock and prevent pull down rope
breakage. Can be made from leaf springs or tension
rods.
Spring Constant: Mathematically
developed number from basic spring wire formulas,
that applies to any
specific wire size and coil diameter combination;
used to determine the number of active coils a
spring
must contain
Spring Containment Device: See
Containment Cable
Spring Fitting: A plug or cone
used to adapt the torsion springs to the torsion
shaft and/or center bearing
bracket. One piece is a stationary cone while the
other fitting is a winding plug
Spring Hook: See S-Hook
Spring Latch Lock: See Automatic
Latch
Spring Pad: Pad installed on
header above the door to anchor the center bearing
bracket. Can be mounted in
various locations, not necessarily in center,
depending on size of springs
Stationary Plug: See Stationary
Cone
Stationary Sleeve: See Stationary
Cone
Stationary Spring Cone: See
Stationary Cone
Steel Jamb: Door framing made
from either channel or angle iron
Steel Jamb Mounted: A track
system intended for mounting to a steel jamb
Steel Pin: Short, headless
pointed nail driven through the dowel and rail in
doors for greater security
Step Down Plate: A means of
closing a sectional door the last few inches of
its travel
Step/Lift Plate: A part that can
be used as a step down plate and a lift handle for
manually operating a sectional
door
Sticker: See Decal
Stile: Vertical reinforcement
member of a section
Stock Door: Door made to standard
size and generally kept in inventory at either
distributor or factory
warehouse
Stop: See Stop Mould
Stop Mould: Serves to seal the
perimeter of the door against weather and light
infiltration; usually nailed to the
jamb, outside the door
Stop Moulding: See Stop Mould
Stress: The amount of work
required of a spring at a desired cycle level
Stretch Spring: See Extension
Spring
Strike: See Striker Plate
Striker: See Striker Plate
Striker Plate: A plate used in
conjunction with a locking system to secure a lock
mechanism
Strut: Support stiffener to
reduce deflection of the door sections in the
horizontal position. Also, to increase
windload capability of a door
Sway Brace: See Angle Brace
Sway Strap: See Angle Brace
Sweep: See Trajectory
Swing-Away Post: A type of
removable center post that remains attached at the
top and can be pivoted out of
the way
Swing-Up Post: See Swing-Away
Post
T Handle: A handle in the shape
of a gTh
T Lock Handle: See T Handle
Tapered Vertical Track: See
Inclined Track
TC: A designation of door opening
size indicating an opening for two cars
Template: A pattern used as guide
to shape something or show hole drilling
locations. Also a short header to
support a beam in a wall
Test Load: See Test Wind Load
Test Wind Load: Specified
difference in static air pressure (positive or
negative), equal to a specified
percentage greater than or equal to 100% of the
design load
Thermal Barrier: See Thermal
Break
Thermal Break: The separation
between the outer and inner surfaces of a door
section
Thermal Seal: See Bottom
Weatherseal
Tin-Canning: See Oil-Canning
Tog-L-Loc: Method of mechanically
securing two pieces of steel together without
welding, riveting or bolting
Top Carrier: See Top Fixture
Top Fixture: A bracket for
positioning the top guide roller on the top
section of a door
Top Header Seal: See Top Seal
Top Rail: Horizontal rail forming
the top of a door as distinguished from the
meeting rails and bottom rail
Top Roller Bracket: See Top
Fixture
Top Roller Fixture: See Top
Fixture
Top Seal: Weatherstripping which
fastens to the top of the door to seal the door
along the top of the opening
Torque: The twisting force around
an axis
Torque Bar: See Torsion Shaft
Torsion: Act of twisting or
turning of a torsion spring by the exertion of
forces tending to turn one end about a
longitudinal axis while the other end is held
stationary
Torsion Bar: A long metal bar
that transfers torque from a spring to a winding
plug
Torsion Shaft: A shaft that
transfers torque from springs to load
Torsion Spring: A spring that
works in the manner of twisting one end or part
about a longitudinal axis while
the other end is held or turned in the opposite
direction developing torque
Torsion Spring Assembly: Hardware
used to make up door counterbalance assembly
Torsion Spring Counterbalance Assembly:
See Torsion Spring Assembly
Torsion Tube: See Torsion Shaft
Torsion Tube Coupler: See Coupler
Track: Channel shaped metal bars
or rails in which upward acting doors operate via
track rollers
Track Bracket: A fixture,
connected to a track, which is designed for the
track to be mounted to the jamb
Track Clip: A metal plate used to
attach tract to wall angle
Track Graduation: The
differential distance from the track to the door
jamb, measured at the top and bottom of
the vertical track
Track Guard: Added protection for
back of vertical track recommended in cases where
powered material
handling fork trucks and similar equipment may be
operating in the area.
Track Hanger Kit: See Back Hang
Track Radius: See Horizontal
Radius
Track Roller: Roller assembly for
guiding the door sections along track
Trajectory: The arc of travel or
sweep of the top section as the door is raised
from closed to open position
Translucent Door: Door that
allows the passage of light without being
transparent
Transom Bar: A horizontal
crossbar in a window, over a door, or between a
door and a window or fanlight
Transom Section: An extra section
above a garage door opening sometimes used to
allow extra lift of the
horizontal tracks to accommodate a trolley type
operator
Trim: The finishing materials;
such as the lock and handles on the door
Triplex Spring: Three springs of
increasing diameter assembled one inside another
using special spring fittings
Trolley Opener: See Drawbar
Operator
Trolley Type Operator: See
Drawbar Operator
Truss: See Strut
Truss Bar: See Strut
Tubular Shaft: A hollow shaft
Turn: A 360-degree revolution of
a component about its axis
Turns On Spring: See Winds On
Spring
Twist: A form of warp caused by
the twisting or winding of the edges of a rail
U-Bar: See Strut
U-Bar Stiffener: See Strut
U-Bar Truss: See Strut
gUh Strut: See Strut
U-Value: Thermal transmission
coefficient which is a measurement of heat, in
BTU's, transmitted through one
square foot of material (the door) in one hour at
a temperature difference of 1 degree from one side
to the
other
Upper Trajectory: See Trajectory
Upper Vertical Track: Upper track
assembly on a vertical lift door
Vent: An opening located in the
bottom section of a door for ventilation
Vertical Grain: See Edge Grain
Vertical Lift: Refers to a
hardware design that causes doors to open
vertically where no horizontal tracks are
required
Vertical Lift Drum: A cable drum
with changing radius grooves to negate spring
tension
Vertical Splice Angle: See Jamb
Angle
Vertical Track: The portion of
track that is oriented vertically and is adjacent
to the jamb
Vertical Track Assembly: An
assembly made up of a piece of vertical track and
a piece of continuous angle or
jamb brackets used to secure the track to the
jamb.
Vision Lite: Glazing that is
mounted in a door
Warning Tag: A tag with warnings
and/or instructions for safe operation
Water Seal: A coating of some
kind used to prevent the absorption of water
Water Stop: See Rain Stop
Weather Joint: See Weatherstrip
Weatherseal: See Weatherstrip
Weatherstrip: Material used at
the perimeter of a garage door, or between joints
of a garage door, intended to
improve a doorfs performance against air
infiltration and thermal transmission
Wedge Connection: A device
composed of a steel wedge and clip for securing
the joint between vertical and
horizontal track sections
West Coast Lumber: Lumber
produced on the West Coast, generally used in
manufacturing wood sectional
garage doors
Wheel and Axle: See Track Roller
Wicket Door: See Pass Door
Wind Load: See Design Wind Load
Winding Bar: See Winding Rod
Winding Cone: Part that fits into
a torsion spring permitting winding and tension
adjustment
Winding Cone Set Screw: See
Winding Plug Set Screw
Winding Cone Socket Head Set Screw:
See Winding Plug Set Screw
Winding Plug: See Winding Cone
Winding Plug Set Screw: Set screw
fasteners used to lock the winding plug to the
torsion shaft
Winding Rod: A solid rod that
fits into the socket of the winding plug to
tension torsion springs
Winding Sleeve: See Winding Plug
Window Lite: See Vision Lite
Winds On Spring: The number of
winding turns on a torsion spring
Wire Glass: Glass into which wire
netting is woven prevent splintering from heat or
impact
Wire Rope: See Aircraft-Type
Cable
Wire Size: The diameter of the
wire in a spring
Wood Anchor Pad: See Spring Pad
Wood Casing: See Wood Jamb
Wood Jamb: Upright wood piece
forming the side of an opening
Wood Jamb Mounted: Refers to
mounting vertical track to wood jambs
Woodruff Key: Special half-moon
shaped steel key
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