Lock Shop Direct measurement guide How to Measure Garage and Roller Shutter Locks Use this guide to identify and measure replacement locks and handles for up-and-over, sectional, side-hinged garage doors and roller shutters. Important: Identify the door type and complete operating mechanism before removing anything. Garage-door springs, cables and powered operators must not be disturbed during a simple lock measurement. In this guide Identify the door type Measure a garage lock Handle and spindle Roller-shutter lock Safety checks 1. Identify the garage or shutter type Different door constructions use very different locks and operating parts. Identify whether the opening is an up-and-over canopy door, retractable door, sectional door, side-hinged door or roller shutter. Up-and-over canopy Door tilts out and up with tracks or pivot arms. Central handles often operate cables or rods. Up-and-over retractable Door retracts fully into horizontal tracks. Check lock and handle clearance through travel. Sectional door Hinged horizontal panels travel in tracks. Use hardware designed for the panel system. Side-hinged doors Measure each leaf, meeting stile, rebate and bolts in a similar way to a pair of doors. Roller shutter Interlocking curtain rolls above the opening. Locks may be central, rail-mounted, bullet or ground locks. Powered door Do not modify locking or safety systems without checking the manufacturer and competent installer. 2. Measure an up-and-over garage lock Where a central handle operates cables, rods or locking bars, record the complete mechanism rather than the handle alone. Measure the handle, lock body, spindle and linkage arrangement. What to check How to measure or identify it Record Door thickness At the lock and handle position. _____ mm Handle fixing centres Centre-to-centre spacing of handle or escutcheon fixings. _____ mm Spindle Profile, width, length and how it connects to the lock. ________ Lock body Width, height, depth and fixing centres. _____ × _____ × _____ mm Cable/rod travel Connection type, length and direction of movement. ________ Locking points Number and position of side, top or bottom latches. ________ 3. Identify the handle and spindle Garage handles can use square, diamond, rectangular, splined or manufacturer-specific spindles. Check the cross-section and orientation as well as the length. Compare spindle profile, handle shape and fixing arrangement before ordering. Handle shape and rotation. Spindle profile and dimensions. Usable spindle length through the door. Escutcheon or backplate dimensions. Inside release and emergency override. Key type, code and keyed-alike requirement. 4. Measure a roller-shutter lock Roller-shutter locks may be fitted in the bottom rail, central slat, guide rail or side frame. Record the shutter profile and available clearance. Measure the case, faceplate, cylinder and bolt or bar arrangement. What to check How to measure or identify it Record Lock case Width, height and depth of the body. _____ × _____ × _____ mm Faceplate Length, width and fixing centres. _____ × _____ mm Cylinder/keyway Type, projection and operating direction. ________ Bolt or bar Width, thickness, throw and direction. ________ Shutter/rail profile Channel dimensions and fixing material. ________ Clearance Space behind and beside the curtain during movement. _____ mm 5. Safety before removal or modification Garage doors can be dangerous: Springs, cables, counterbalances and powered operators can store significant energy. Do not loosen or alter them as part of a lock measurement. Isolate powered equipment and use a competent garage-door engineer where the work affects the operating or safety system. Support and secure the door before removing a central lock or linkage. Do not drill where springs, cables, electrical wiring or moving parts may be hidden. Check that added locks cannot be engaged while an automatic operator is used, unless designed for that system. Test manual release and emergency access after fitting. Still not sure which product you need? Send our team clear photographs and your measurements before ordering. Please include: A full photograph of the door inside and outside. Close-ups of the lock, handle, spindle, cables or rods. Door type, material and thickness. Lock case, handle fixing and spindle measurements. For shutters, the lock case, bolt and rail or curtain profile. Sales and technical advice Monday to Friday, 9:30am to 4:30pm Telephone: 0330 174 0851 Email: info@lockshopdirect.co.uk Browse garage securityAll measurement guides This guide is intended to help identify and measure replacement hardware. Product designs, terminology and handing conventions can vary by manufacturer. Always compare the complete product specification and fitting instructions. Where a door or fitting forms part of a fire escape, fire door, powered system or other safety-critical installation, obtain advice from a competent person before ordering or altering the hardware.