A deadbolt lock is an auxiliary lock that throws a bolt into the frame by key or thumbturn, with no spring latch to slip. We install, replace, repair and rekey deadbolt locks across Maryland, Washington DC and Northern Virginia, specifying by ANSI/BHMA A156.5 grade first, because Grade 1 means a 1 inch throw. Licensed, insured and bonded for 25 years.
A bored deadbolt is an auxiliary lock under ANSI/BHMA A156.5, coded E0141 single cylinder or E0151 double cylinder. The key or thumbturn turns a tailpiece that drives a hardened bolt into the strike. The housing sits in a 1 inch edge bore, the cylinder in a 2-1/8 inch cross bore, and through-bolts clamp both to a mounting plate.
Doors across the District of Columbia carry 2-3/8 or 2-3/4 inch backsets, and Grade 1 hardware wants a strike box with 3 inch screws. We fit SC1 and KW1 cylinders, SFIC housings for Best A2 systems, or UL 437 Medeco cylinders for drill resistance. Tell us the door; we match the deadbolt.
A deadbolt’s advantage is the absence of a spring. A knob or lever latch can be carded back from outside; a deadbolt’s 1 inch bolt only moves when the cylinder or thumbturn turns it, so the door resists slipping, kicking and prying.
Grade 1 hardware rated to 250,000 cycles outlasts any builder grade unit, the 2-1/8 inch cross bore means an upgrade drops into your prep, and interchangeable core housings rekey without pulling the lock. Still running a Grade 3 deadbolt? Upgrading takes one visit.
Deadbolts carry the perimeter on single-family homes, townhouse entries, apartment doors and back-of-house doors on retail and office suites across North Virginia. Wherever a keyed knob or lever is the only lock, we add a Grade 1 deadbolt above it.
A deadbolt is the wrong choice on a fire-rated door or any door that must open in one motion for egress; a self-latching storeroom or classroom function lockset belongs there.
A door with a failing deadbolt is an open door, not a maintenance ticket. Call (202) 800-2622 now or book deadbolt service online today.
These are the deadbolt lines we carry on our trucks because their bolts, cylinders and strikes hold up across the DMV, and because we can service every one for years.
The B60N is ANSI/BHMA Grade 1 with a 1 inch throw and an adjustable bolt for 2-3/8 or 2-3/4 inch backsets, rekeyed on SC1 keyways.
Maxum deadbolts pair a Grade 1 hardened bolt with UL 437 listed cylinders and patented keyways, resisting picking, drilling and unauthorized duplication at hardware counters.
The 83T takes Best small format interchangeable cores, so property managers swap a 7-pin A2 core in seconds while we handle combinating and control keys.
The bolt will not throw fully: hinge sag drops the bolt onto the strike lip, or the strike pocket sits too shallow for a 1 inch throw. The key turns but nothing moves: the tailpiece sheared or the torque blade slipped from the cylinder cam. The cylinder spins: retaining screws stripped or the mounting plate loosened.
We check hinge sag and strike alignment, then pull the cylinder to inspect tailpiece and cam, then test the throw. Locked out? Mobile units respond 24/7. Call (240) 345-1455 in Maryland or (202) 800-2622 in Washington DC and NOVA.
Alignment first: we reset hinges, deepen the strike pocket for a 1 inch throw and refit the strike box with 3 inch screws. Sheared tailpieces and slipped torque blades get new parts; spinning cylinders get new retainer screws.
Replacement follows attack damage, a bent housing, discontinued Grade 3 parts or a Grade 1 upgrade. We match backset, cross bore, door thickness, cylinder format and finish so the new deadbolt fits the existing prep without drilling, rekeyed to your key or master system where the keyway allows. Measure, match, install, test throw and thumbturn; our in-house door expert corrects frame alignment same visit.
Our locksmith tests your deadbolt, prices repair against a Grade 1 replacement on the spot, and completes whichever you choose before leaving.
Deadbolt locks secure home entries, apartment units and storefronts, but every door has its match. Browse our lock type resources below to see each function, its applications and our services.
Straight answers from King Locksmith Technicans to on Deadbolt Locks questions customers ask us most.
(240) 345-1455
Bored deadbolts fall under ANSI/BHMA A156.5: E0141 for single cylinder with thumbturn and E0151 for a double cylinder keyed both sides.
Grade 1 on perimeter doors: a 1 inch throw, 250,000 cycles and hardened inserts against sawing. Grade 2 suits interior offices.
Only a deadbolt listed for fire door use belongs on a labeled door, and the latch must still self-latch. We check the label first.
A 2-1/8 inch cross bore, 1 inch edge bore at 2-3/8 or 2-3/4 inch backset, and a strike mortise deep enough for the throw.
