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Solid bronze double cylinder deadlock in dark bronze finish US10

Prime-Line

Prime-Line 687 Solid Bronze Double Cylinder Deadlock US10

SKU CH-2KQ6-VHAF5 MPN 687

Solid bronze double-cylinder deadlock with jimmy-proof design, shutter guard and hardened drill-point screws for commercial-grade security

  • Surface finishDark Bronze
  • Sold asEach
  • Product typeDeadlock Double Cylinder
  • Key featuresSegal
  • Commercial-grade security backed by solid bronze construction
  • Jimmy-proof deadlock resists forced-entry tampering
  • Double-cylinder design requires a key on both sides
  • Hardened drill-point screws protect against drilling attacks
  • SE1 keyway with recessed cylinder collar adds pick resistance

Solid bronze deadlock with double cylinder

The Prime-Line 687 is a solid bronze deadlock featuring a double cylinder design and US10 dark bronze finish. It uses a SE1 keyway and includes a flat strike plate. The lock is supplied boxed and ready for installation.

For doors needing keyed entry both sides

Suits exterior doors where keyed access is required from both the inside and outside. Not suited for doors where a thumb-turn interior release is preferred or where single-cylinder operation meets fire egress requirements.

Double cylinder with SE1 keyway

The defining specification is the double cylinder mechanism paired with an SE1 keyway, meaning a key operates the deadbolt from both sides. Verify that this keyway matches your existing key system before purchase.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $149.99
Pricier than about 76% of the 2,145 comparable items (median $55.99).

Specifications

Product
Model name687
Product typeDeadlock Double Cylinder
Size & build
Surface finishDark Bronze

Questions about this item

How often will the SE1 keyway cylinders need re-keying or replacement under normal use?

The SE1 keyway cylinders are solid brass and built to commercial grade standards, so they typically only need re-keying if keys are lost or access changes, not from routine wear.

What limits continuous operation on a high-traffic door?

The hardened drill-point screws and solid bronze case bolt resist forced entry, but the flat strike and latch mechanism will show binding first if the door or frame shifts out of alignment.

Does the lock generate heat or noise when operated repeatedly all day?

No, the mechanical deadlock has no motor or electronics, so it produces no heat and only a brief, quiet click each time the double cylinder is turned.

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