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Home >  » Miscellaneous Security Items > Sargent and Greenleaf S&G 8550 Manipulation Proof Safe Lock UL Group 1 US GOV

Sargent and Greenleaf S&G 8550 Manipulation Proof Safe Lock UL Group 1 US GOV

Item #: 3620
Price:$489.00
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Comes complete with change key and instructions and all mounting hardware • Comes with D054 Spy Proof Dial (small knob) & R162 Ring (3.753")

These Sargent & Greenleaf were used for more than 30 years to secure the most sensitive installations from weapons systems to classified documents. It is among the most secure mechanical type locks made. It has been tested by Underwriters Laboratories against manipulation opening for 20 man hours and certified as a UL listed Group 1 lock. The lock has also been tested and approved by the following international security testing agencies: VdS Class 2, CEN B, DNV 3492, CNPP A2P B/E.

Unlike common and lesser secure type combination locks the tumblers and drivers do not touch making manipulation virtually impossible.

This lock comes with a special Spy-proof dial so the numbers can only bee seen by the person dialing the combo. This lock will fit any safe that has a standard mounting footprint safe lock. The lock comes complete with installation instructions and all screws and parts.

Lock Features:
  • Three combination wheels for 1,000,000 possible combinations
  • Tested against expert manipulation for 20 hours by U.L. Laboratories
  • Integral relock trigger thwarts punch attacks
  • Thermal relock protects against torch type attacks
  • Designed and constructed to perform in the most demanding applications
  • Brass and aluminum wheels for long dependable life • Black & White finish


  • Product Reviews for Sargent and Greenleaf S&G 8550 Manipulation Proof Safe Lock UL Group 1 US GOV




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