The Doorman's Glossary

The ultimate glossary to help you navigate through the doors and loading dock equipment's terminology.

Powder CoatingWhile traditional painting and powder coating are both "coating" processes, powder coating is more wear resistant and maintains color integrity longer due to its more intensive preparation before coating, its electrostatic application, and also its greater thickness applied. For more information about our powder coating services, see Powder Coating.
SlatMany roll up curtains are made of slats, formed strips of sheet metal with eyes on their tops and bottoms where they slide together, They can be made of wood, and other materials as well. They come in a variety of sizes and profiles, and can be painted, powder coated, galvanized, or perforated. They can also be thermally insulated. American Door recommends end-locking the slats for extended curtain life, and decreased wear due to slat drift.
Slat ProfileA slat's profile has to do with its shape along the shortest edge. Most profiles are named for the part of the shape between the the top and bottom eyes such as "Flat," "Single Crown," and "Double Crown." Their names can also include the height dimension of the profile such as two inch, three inch,or four inch. Some slats are doubled up (back to back) so that their profiles form a channel that is filled with thermal foam, such as a "Double Insulated Flat Slat".
CurtainOn a coiling or sliding door, the curtain is the part that retracts, enabling an opening to be "free to pass" or "secure" depending on the curtain's position. A curtain can be made of a variety of materials including slats, panels, PVC, or a mix of fabrics. Common door curtains are typically coiling or folding.
EndlocksComposed of metals or plastics, end locks or endlocks, are mounted to the side edges of slat curtains to prevent the slats from shifting from side to side, which causes curtain wear and jamming. They are commonly bolted or riveted in place. They come in a variety of sizes and shapes depending on the curtain and needed functionality. Some types besides standard endlocks are windlocks, roller windlocks, and articulating roller windlocks.
GuidesThe guides of a roller door limit it's travel from side to side. They are commonly made of a composite of metal angles, but can be constructed in other ways as well.
Helical Torsion SpringA type of spring commonly used for overhead doors to offset the weight of a curtain or a sectional door assembly. Unlike extension or compression springs, a torsion spring stores energy through the twisting of the ends of the spring. The shape of the spring is helical, as it is formed into a coil.