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Polished brass single-cylinder deadbolt with thumb turn and keyway visible

Mul-T-Lock

Mul-T-Lock HD1-05 Brass Hercular Single Cylinder Deadbolt 006 Keyway

SKU CH-FZ55-W3C97

Heavy-duty single-cylinder deadbolt with adjustable backset, ANSI Grade 1 certification, UL fire rating, and drill-resistant cylinder

  • Security gradeHeavy Duty
  • Grade1
  • Lock keyingKeyed Different
  • Surface finishPolished Brass
  • Sold asBox
  • Product typeDeadbolts
  • ANSI Grade 1 certification confirms heavy-duty security
  • UL 437 listing verifies drill and pick resistance
  • Adjustable backset fits 2 3/8 to 2 3/4 inch door recesses
  • Patented key control with 006 keyway prevents unauthorised duplication
  • UL fire-rated latch approved for fire-door installation

High-Security Brass Deadbolt

The Mul-T-Lock HD1-05 is a single-cylinder deadbolt built from solid brass and steel. It carries ANSI Grade 1 certification and UL 437 listing for drill and pick resistance. The lock suits residential and commercial doors that require heavy-duty protection against forced entry.

Adjustable Backset Installation

The deadbolt fits standard door recesses with an adjustable backset ranging from 2-3/8 inches to 2-3/4 inches. A thumb turn on the interior side allows keyless egress. Professional fitting is recommended to ensure the cylinder aligns correctly and the UL fire-rated latch engages fully.

Grade 1 Protection and Key Control

The 006 keyway cylinder resists bumping, drilling, wrenching, ice-pick and hammer attacks. Two keys and a key ID card are supplied, supporting the patented key-control system that prevents unauthorised duplication. The mechanism meets UL fire-door requirements for rated openings.

How it compares

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

Price $151.99
Pricier than about 76% of the 2,145 comparable items (median $55.99).

Specifications

Product
Product typeDeadbolts
Size & build
Surface finishPolished Brass
More details
Security gradeHeavy Duty
Grade1
Lock keyingKeyed Different

Questions about this item

How do I confirm the deadbolt is operating correctly after installation?

Turn the thumb-turn from inside and the key from outside; the bolt should extend and retract smoothly, the 006 keyway cylinder should resist bumping, and the UL 437 listing confirms drill and pick resistance.

What components are included in the box and what must be purchased separately?

The box contains the solid brass single cylinder deadbolt with thumb turn, two keys, and a key ID card; no additional parts are required for standard installation.

Which keyway option should I select for this lock?

This model is supplied only with the 006 keyway, so there is no alternative version to choose.

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