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Polished brass cylinder collar guard, 5/8 inch high, wrought brass construction

Marks USA

Marks USA 9276-3 Polished Brass 5/8" Cylinder Collar Guard

SKU CH-F63M-MN236 MPN 9276-3

A free-spinning cylinder collar guard in polished brass that prevents forced removal of mortise lock cylinders

  • Surface finishPolished Brass
  • Free-spinning guard prevents forced cylinder removal with tools
  • Polished brass US3 finish resists corrosion and matches hardware
  • 5/8" projection fits standard mortise cylinder installations
  • Wrought brass construction withstands physical attack attempts
  • Cylinder sold separately — guard only in package

Cylinder Collar Guard 9276

This Marks USA cylinder collar guard is designed for mortise lock installations where cylinder protection is required. It provides a free-spinning ring that prevents forced removal of the lock cylinder using common burglary tools. The guard suits residential and commercial doors fitted with mortise cylinders.

Wrought Brass Construction

The guard is made from wrought brass with a polished brass US3 finish that resists corrosion and matches traditional hardware. Its 5/8" projection adds a low-profile barrier without interfering with door operation. The included insert ensures a secure fit around the cylinder, and the unit is sold as a single guard with the cylinder purchased separately.

Mortise Cylinder Compatibility

This guard fits standard mortise cylinders only and will not suit rim cylinders or other lock types. The free-spinning design protects against gripping tools but does not prevent other forms of attack such as drilling or picking. Buyers needing protection for multiple cylinders must order additional guards.

How it compares

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

Price $18.99
Cheaper than about 72% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks USA
Model name9276-3
Size & build
Surface finishPolished Brass

Questions about this item

What type of cylinder does the 9276-3 collar guard fit?

It is designed for mortise cylinders and includes a free-spinning insert that resists forced unscrewing with tools.

What door projection does the 5/8" high guard add?

The guard extends 5/8 inch from the door surface, so the mortise cylinder must accommodate that additional projection.

How is the guard installed and what step is often missed?

The guard threads onto the mortise cylinder before the cylinder is secured in the lock body; the cylinder itself is sold separately and must be purchased to complete the installation.

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