A half cylinder locks from one side only, and it guards the roller shutters, garage doors, gates and key switches we service across Maryland, Washington DC and Northern Virginia. We replace, rekey, repair and install every common size and keyway. Licensed, insured and bonded, with 25 years in business, our mobile units carry the parts your hardware needs.
A half cylinder is a euro profile cylinder built to DIN 18252, keyed on one side with a fixed 10 millimeter stub on the other. The brass plug rides in a 17 millimeter housing above a 10 millimeter wide body, pinned through five or six chambers and retained by a single M5 fixing screw through the door edge.
Lengths run from the cam center, commonly 30/10 through 45/10, and the cam on most half cylinders adjusts in 45 degree steps to suit shutter boxes and key switches. Many share keyways with full euro cylinders, so we key them alike, which is why storefront grilles across the District of Columbia and garage hardware throughout the region run this format.
Three failures dominate our half cylinder calls. The single M5 fixing screw backs out or its thread strips, so the whole cylinder spins in the housing. Exterior gates and shutters seize plugs when water corrodes the brass chambers. And with only one keyed side and no inside turn, a lost key means a genuine lockout.
On arrival we check screw engagement, cam alignment and plug rotation, then flush chambers and replace pins and springs from the kits on our trucks, or extract a seized plug. A worn keyway or corroded plug is honestly a replacement, not a repair. Locked out? Our mobile units respond 24/7. Call (240) 345-1455 in Maryland or (202) 800-2622 in DC and NOVA.
We recommend replacement after attack damage, a stripped fixing thread, a discontinued keyway or a security upgrade. We measure from the cam center, select the correct 30/10 to 45/10 length, set the cam angle and match keyway and finish so the new half cylinder drops into your existing hardware with no new drilling. Where the keyway allows, we pin to your existing key, build keyed alike sets with your full euro cylinders, and master key multi-door properties.
Installation starts with compatibility checks: projection flush with the escutcheon, fixing screw engagement and cam clearance inside the lock box. Our own certified technicians measure, match, install, then test operation and security before we leave, and our in-house door expert corrects gate and shutter alignment in the same visit.
Stripped threads, seized plugs and lost keys all end the same way: we measure, match and fit your new half cylinder in a single visit.
Anyone can hand you a half cylinder. Measuring from the cam center, setting the cam angle and matching keyways takes 25 years of practice.
We measure your existing cylinder from the cam center, confirm 30/10 through 45/10 sizing, and set the adjustable cam angle before any part gets ordered.
Our locksmiths service euro profile plugs, pin chambers and fixing screws daily, reading corrosion and wear patterns before pinning your replacement half cylinder on site.
Our mobile units carry pinning kits, followers, common euro keyways and half cylinder lengths, which means most replacements and rekeys finish in a single visit.
Roller shutters, gates and garage doors punish misaligned hardware. Our door specialist squares tracks, boxes and strikes during the same appointment, protecting your half cylinder.
A failing half cylinder leaves your shutter, gate or garage exposed. Call (240) 345-1455 now or request cylinder service online.
Half cylinders are one of many cylinder formats we service daily. Browse the other cylinder types our technicians repair, rekey, replace and install across Maryland, Washington DC and Northern Virginia.
Straight answers from King Locksmith Technicans to on Half Cylinder questions customers ask us most.
(240) 345-1455
A loose fixing screw or dry chambers we repair on the spot. A corroded plug or stripped fixing thread means replacement, and we tell you which one honestly.
We give free on-site estimates with no hidden fees. Price depends on length, keyway and finish. Call (240) 345-1455.
Most shutter lock boxes accept a euro half cylinder when the length from the cam center and the cam angle match. We verify both before fitting.
