Explanation of Terms

Automatic Latch: Automatically locks door
Automatic Opening Device: Opens door quickly without electric operator
Back Hang: Iron hanger holds tracks to ceiling
Back Jamb: Interior wood surrounding door
Backroom: Distance from header above door to first blockage of headroom
Ball Bearing:  Metal ball used to reduce friction
Ball Bearing Drum: Gives smoother operation of heavy doors
Bar Joist: Lightweight truss that can hold roof decks
Bead: Strip to hold glass in window frame
Black: Signifies right side, left wound
Blind Rivet: To hold two surfaces to each other
Booster Spring: Extra spring to ensure proper counterbalance
Bottom Corner Bracket: Keeps track rollers and also for lifting cables
Bottom Rail: Door's lowest rail
Bottom Weatherseal: Weatherstrip between door and floor
Bow: Crooked or bent door
Bracket Mounted: Vertical track mounted to jamb with angle brackets
Broken Cable Device: Safety part in case of cable breakage
Bushing: Lining to control friction
Cable Clamp: Holds cables together
Cable Drum: Drum on torsion spring shaft that holds lifting cable
Cable Drum Set Screws: Screws that hold drum to the shaft or tube
Cable Length: Total cable needed
Cable Safety Device: Safety feature in case of cable breakage
Cable Stop: A swaged fitting to stop slipping
Cam: Turns rotary movement into linear movement
Cam Tube: Provides axial force
Carry-Away Post: Removable center post
Ceiling: Garage's interior top
Center Bearing Bracket: Holds torsion shaft and spring assembly and anchors stationary cone to header
Center Bearing Plate: Holds counterbalancing mechanism to torsion shaft and torsion springs to header.
Center Bushing: Helps center bracket support a torsion tube
Center Hinge: Lets sections pivot when opening door and can serve as edge hinge between sections
Center Lift Cable: Gives more lift for very big doors.
Center Post: Area between two doors or extra strength against wind
Center Stile: Adds structural integrity and attaches to center hinge
Center Track: Extra track helps stop doors from sagging
Chain Hoist: A sprocket or pocket wheel that connects to torsion spring to ease opening and closing door
Chain Hoist Operator: Jackshaft-type operator attaches to chain hoist
Channel Frame: Steel flanges that follow the jambs
Chill: A square shaft joining exterior and interior latches
Clearance: Area available for proper installation
Clevis Pin: Steel pin used with a cotter pin to hold cables, arms and brackets together
Commercial: Overhead door designed for heavy commercial use
Containment Cable: Safety cable in case of spring breakage
Contour Track: Follows the layout of ceiling
Corner Burn: Fire emergency test where fire starts next to garage door
Cotter Pin: Holds by flaring through a hole
Counterbalance: Equalizes balance with a comparable force
Counterbalance System: Decreases effort to operate doors
Counterweight: Weights used to counterbalance door weight
Coupler: Connects counterbalance shafts
C-Value: Measure of how heat flows through insulation
Cycle: One opening and closing of a door
Cylinder: Lock mechanism
Daylight Opening: Measurement between jambs, floor and header
DC: Double-car door opening
Dead Coils: Coils inactivated by spring plugs
Dead in the Head: Door doesn't stay fully open due to lack of counterbalance
Dead Load: Nonmoving load
Decal: Basic data attached to door
Design Wind Load: A garage door's capacity based on wind, location and height
Disconnect Chain: Emergency feature for manual operation when power fails
Door Casing: Frame surrounding door opening
Door Check: Ensures that pass door or wicket closes
Door Closer: A mechanism that uses a spring to close the door quietly
Door Frame: Enclosure for the door
Door Header: Top of door frame
Door Jamb: Sides of door frame
Door Schedule: Overview of sizes and placements for doors
Door Section: One piece of a sectional door
Door Size: Door measurements
D Shaft: A torsion shaft that limits spin of attachments
Double Door: Two or more vehicle openings
Double End Stile: Two neighboring stiles on both sides of section
Double Glazing: Twice the glazing for better insulation and noise reduction
Double Shaft: Double torsion spring shaft for more space with counterbalance spring lengths
Double-Strength Glass: Extra-strength glass typically 1/8" in thickness
Double Top Roller Fixture: Uses two top brackets to accommodate a longer roller shaft
Double Track Low Headroom: An extra set of horizontal tracks used for applications with scant headroom
Dowel: Wood cylinder for joining wooden pieces together
Drawbar Operator: Lifts door electrically for doors with normal or low headroom
Drip Cap: Designed to draw water away from door and building
Drip Lap: Designed to protect steel doors from weather
Driveway Post: Allows easy automatic operation of door via key switch
DSB:  Glass that is double-strength grade B
Duplex Spring: A pair of different-sized torsion springs
Eased Edge: A contoured meeting rail edge
Eave Height: Measurement of height from ground to roof eave
Edge Grain: Quartersawn lumber
Electric Operator: Electrically opens and closes door
Electrical Interlock: Device to stop door operation
Embossed Door Section: Decorative raised design
Embossed Panel: Panel with a raised design
Embossed Rosette: Raised ornamental design of wood or metal
End Bearing Plate: Helps radial movement of a torsion shaft at each end of torsion spring counterbalance
End Stile: Stile located at end of door section attached to graduated edge hinges
End Stile Sealing Strip: For sealing sections at end stiles of steel or fiberglass doors
Escutcheon: Surrounds the exterior lock mechanism
Exhaust Port: Takes hose to safely remove vehicle exhaust
Extension Spring: Stretches or pulls to increase tension or power
Exterior Lock: Outside keyed lock
Extrusion: Process for forming metal and plastic parts
False Louver Molding: Looks like a slatted panel
Faux Divided Lite: Mullions divide glass and light
Ferrule: Caps a cable's end
Finger Joint: Joins two pieces of wood
Flame Spread Index: Measurement of how quickly a flame will spread horizontally
Flush Door: Even-surfaced door
Front Mounted Low Headroom: For low-headroom mounting
Front-Mounted Spring: A header-mounted spring for counterbalance
Full-View Section Glazed with glass or see-through plastic
Galvanizing: Protects metal against rust
Gauge: System standardizing weight per square foot
Glazed: Covered with glass or see-through plastic
Glazing Strip: Protects window and frame from elements
Graduated Edge Hinge: Lets door sections pivot during opening and closing
Grease Packet: Small amount of grease for lubrication
Grille: Window insert that gives divided lighting effect
Gusset: Metal reinforcement for corners
Gusset Plate: Reinforces track and spring assembly
Hang Down: The part of door hanging down while open
H-Column Jamb: Separates pair of door openings for H-columns
Headplate: Supports lifting drum
Headroom: Clearance between door and ceiling and obstructions
Heliarc Weld: A versatile, durable style of weld
High-Cycle Spring: Long-life spring for heavy use
High Lift: Measurement between header and horizontal track's bottom for high-lift track
High-Lift Drum: Drum made for high-lift door
High-Lift Track: Makes door open higher before retracting horizontally
High-Moment Arm: Cable-drum's radius
Hinge: Attaches door sections while letting them pivot
Hinge Support Plate: Reinforces the hinge mount
Hinge Tube: Attaches a pair of hinge leaves to each other
Hoist Electric Operator: Includes a chain hoist for power outages
Horizontal Radius: Moves from vertical to horizontal track
Horizontal Rise: Horizontal track's rising slope starts the door down
Horizontal Track: Moves door horizontally
Horizontal Track Angle: Reinforces horizontal track
Horizontal Track Assembly: Track and reinforcement angle move and hold door horizontally
Hot off the Floor: Unwanted rising of door from floor
Inch-Pounds: Torque measurement
Inclined Track: Smooth-moving vertical track that protects against weather and friction
Inside Hook Up: Counterbalance cable inside track
Inside Hook Up Bottom Bracket: Cable routed via bottom corner bracket
Inside Lock: Lock operated via door interior
Installation: Installing door
Installer: Person who installs door
Insulated Door: Doors with insulation
Insulating Glass: Glass with insulating air spaces between panes
Insulation: Decreases temperature transfer
IPPT: Inch-pounds per turn denotes a spring's torque rate
ISLO: Inside looking out
Jackshaft-Type Operator: Wall- or ceiling-mounted device turns torsion shaft
Jamb Bracket: Joins vertical track and door jamb
Jamb Extension: Used to hold door track and spring assemblies above opening height
Joint, Shiplap: Raised part of a section joint used between door sections for a weatherproof seal
Joint, Tongue-and-Groove: A locking joint for weatherproofing connections between door sections
Key: Keeps parts from rotating
Key Switch Control: Alternative to push button or transmitter to start door operator
Key Way: Groove used with key to stop rotation of parts on shaft
Keyed-Alike: Locks that the same key can open
Keyed Shaft: Contains an integrated key way
K-Value: A material's thermal conductance
Lag Screw: Coarse-threaded wood screw
Lap Jamb: Door section overlaps both jambs
Lateral Force: From the side
Lift Handle: Manual door opener
Lintel: Structural support over opening
Lock: Keeps door securely shut
Lock Bar with Cremone: Locks door with rotation
Long-Stem Roller: 7-inch-plus roller
Louver: Ventilates via slats or screen
Low-Lift Hardware: Parts for using a door system with limited headroom
Low Moment Arm: Measurement of the shortest distance from shaft axis to cable center
LSLO: Left side looking out
Lubricant: For lubricating
Lubricate: To decrease friction
Maintenance: Maintaining a system in good running condition
Master Keying: Opening multiple locks with one key
Meeting Rail: Top or bottom horizontal rail forming a seal
Metallurgist Report: Describes components of a metal
Mill Certification: Technical description of a metal by its maker
MIP: Maximum Inch-pounds
Modular Coordination: Coordinated dimensions of building components
Mounting Plate: Steel or wood plate for mounting
Movable Post: Transportable post for use of multiple doors in one opening
Mullion, Garage Door: Door reinforcement
Mullion, Window: Separates window panes
Muntin: Strip that separates window panes in sash
Munton, Window: Makes a faux divided light
Neoprene: Synthetic rubber
Nicopress Sleeve: Cable sleeve made of aluminum or copper
Numbered Panel: Left-to-right numbered space between stiles
Opening Height: Height from ground to header bottom
Opening Width: Width of door opening
Operator: Device that moves door up or down
Outside Hook Up: Connects counterbalance cable on tracks' outside
Outside Hook-Up Bottom Bracket: Cable on outside tracks goes via bottom corner bracket
Overlay: Ornamental wood or metal for exterior door sections
Pan Door: Door made with sheet-metal sections
Panel: Raised design on sections
Pass Door: Swinging door built into sectional door for foot traffic
Pedestrian Door: Door for foot traffic next to garage door
Perforated Angle: Metal part hangs garage doors and operators from punched holes
Perimeter Seal: Weatherstripping around door
Pinch Resistant: Designed to avoid catching and hurting fingers
Pocket Wheel: Chain-link drum or wheel that transmits power
Polyurethane: Foam insulation used in doors
Pounds Pull: Measurement of drum force
Power Unit: Torsion spring assembly
Prefinished: Comes painted
Prime: Paint undercoat
Prime-Painted: Primed with primer for final finish painting
Pull-Down Rope: To pull door down by hand
Pulley: Pulls cable, chain or rope
Purlin: Roof member often used in industrial buildings
Push-Down Spring: Push rods that make door start closing
Pusher Bumper: Leaf spring
Push Nut: Metal fastener that pushes on to a shaft
Quarter Round: Molding cut as quarter of a cylinder
Quarter Turn: Turn measurement for torsion spring winding tension
Radial Force: Force emanating from the middle outward
Rail: Horizontal piece of section
Rain Stop: Part to keep water from running under door
Rate of Rise: Measures drum's movement arm revolution rate
Rear Mount: Counterbalance system connected to horizontal tracks' rear
Red: Means left side, right wound
Removable Center Post: Movable post that serves as a jamb in large openings to accommodate many doors rather than one
Removable Jamb Wall: Wall allows use of multiple doors in one opening
Residential: Overhead door for residential use
Reverse Angle Mount: Permits use of doors in garages with low headroom or side room
Roller Bracket: Holds track roller
RSLO: Right side looking out
R-Value: Measurement of thermal resistance
Sash: Window or door framework for glass
Sash Muntin: Bar for glass in sash with multiple lights
SC: Single-car door
Scarf Joint: Joining wood with glue and dowels
Scribing: Cutting the door's bottom to fit the floor
Section: Part of garage door
Section Joint Meeting Rail Seal: Weatherproofing between sections
Sectional-Type Door: Door made with multiple hinged sections
SG: Single glazed
Shaft Bearing: Keeps torsion shaft in alignment and decreases friction
Sheave: Pulley designed for counterbalance system
Sheave Fork: Attaches sheave to extension springs
Shiplap Section Joint: Interface for joint sections
S-Hook: Used to attach door hardware
Shop Drawings: Manufacturers' or suppliers' illustrations to ensure correct execution of architectural plans
Sideroom: Distances from sides of door opening to nearest horizontal obstructions
Single Door: One-vehicle opening
Single Thick Glass: Glass for sashes
Slant: Roof angle
Solar Glass: Tinted glass
Solid Rail: A jointless rail
Special Door: Custom door
Specifications: Listing of quality and materials for system
Splice Plate: Attaches tracks
Spring Assembly Closed Wound: Gapless coiled tension spring
Spring Assembly Open Wound: Gapped coiled torsion spring
Spring Balance: Number of turns required as counterbalance to door
Spring Bumper: Slows upward movement of door to prevent shocks and rope breakage
Spring Constant: Formula to find number of active coils necessary per spring
Spring Fitting: Adapts torsion springs to torsion shaft or center bearing bracket
Spring Pad: Anchors center bearing bracket from header
Stationary Cone: Connects torsion spring to center bearing bracket
Steel Jamb: Iron door frame
Steel Jamb Mounted: Track system for steel jamb
Steel Pin: Helps secure door rails and dowels
Step-Down Plate: Closes door final inches
Step/Lift Plate: Step-down plate that doubles as manual door handle
Stile: Reinforces a part of a section
Stock Door: Door for standard-sized opening
Stop Mold: Goes around door for protection from elements and sunlight
Stress: Measurement of a spring's work load
Striker Plate: Part of locking system
Strut: Reinforces door for structural support and against wind
Swing-Away Post: Swiveling center post that can be swung aside
T Handle: T-shaped handle
TC: Two-car opening
Template: Plan for shape or drilling; also, a short header for beam support
Test Wind Load: Measurement of wind resistance
Thermal Break: Space between outside and inside parts of door section
Tog-L-Loc: Mechanical means of attaching steel parts
Tongue and Groove Section Joint: Joint for joining adjacent door sections
Tongue and Groove Board: Wood that look like wainscoting
Top Fixture: Attaches top guide roller to door's top section
Top Rail: Horizontal rail at top of door
Top Seal: Weatherstripping that seals opening along door top
Torque: Measurement of force caused by rotation
Torsion: Force turning one end while the other end remains still
Torsion Bar: Long bar made of metal that moves torque from spring to winding plug
Torsion Shaft: Moves torque from springs to load
Torsion Spring: Turns one end while the other remains stationary or is turned the other way
Torsion Spring Assembly: Parts for counterbalance assembly
Track: Channel along which doors run via rollers
Track Bracket: Holds track to jamb
Track Clip: Attaches track to wall angle
Track Graduation: Measurement of differential distance from track to door jamb
Track Guard: Protects vertical track back
Track Roller: Guides door on track
Trajectory: Movement of top section as door opens
Translucent Door: Allows some light to pass but isn't see-through
Transom Bar: Horizontal piece above window or door
Transom Section: Spare section on top of opening giving more lift for trolley-type operator
Trim: Finishing parts, including handles and locks
Triplex Spring: A group of three springs inside each other
True Divided Lite: Multiple windows separated by mullions to make one bigger window
Tubular Shaft: Empty shaft
Turn: One full revolution
Twist: Type of warp due to twisting rail edges
Urethane (Finish): Clear coat to protect and beautify wood
U-Value: Measurement of heat transfer through door
Upper Vertical Track: Upper track assembly
Varnish: Clear coat good for interior wood
Vent: Opening allows air exchange
Vertical Lift: Design requiring no horizontal tracks for opening doors vertically
Vertical Lift Drum: Cable drum with grooves to handle spring tension
Vertical Post: Reinforces against strong wind
Vertical Track: Up-and-down track next to jamb
Vertical Track Assembly: Vertical track and brackets held to jamb
Vision Lite: Door-mounted glazing
Warning Tag: Safety advisory
Water Seal: To prevent moisture damage
Weatherstrip: Material to insulate and protect against elements
Wedge Connection: Holds vertical and horizontal track sections where they meet
West Coast Lumber: Wood from the U.S. Pacific Coast often used for garage doors
Winding Cone: Piece in torsion spring for winding and adjusting tension
Winding Plug Set Screw: Locks winding plug to torsion shaft
Winding Rod: Tensions torsion springs via winding plug's socket
Winds on Spring: Total turns on torsion spring
Wire Glass: Glass reinforced against heat and breakage
Wire Size: A wire's diameter
Wood Grain: Wood pattern and orientation
Wood Jamb: Perpendicular wooden pieces on an opening's sides
Wood Jamb Mounted: Vertical track mounted on wood jambs
Woodruff Key: A semicircular key