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Polished brass mortise lockset with wide face plate, screw-on knobs and right-hand orientation

Tuff Stuff

Tuff Stuff 5100XR Polished Brass Right Hand Mortise Door Lock

SKU CH-HDCF-Y167T MPN 5100XR

Heavy-duty mortise entry lockset with wide face plate, screw-on brass knobs and solid brass cylinder

  • Security gradeHeavy Duty
  • Location typeCommercial/Residential
  • Backset distance2-1/2 in
  • Lock keyingKeyed Different
  • Main functionEntrance
  • Surface finishPolished Brass
  • Heavy-duty security with solid brass construction
  • Wide 1-1/4" x 8" face plate reinforces door strength
  • Right-hand mortise design fits specific door handing
  • Screw-on knobs with swivel spindle ensure smooth operation
  • Solid brass cylinder includes two keys for entry

Polished Brass Mortise Entry Lockset

The Tuff Stuff 5100XR is a right-hand mortise entry lockset finished in polished brass. It uses surface-mounted screw-on knobs with a swivel spindle and includes a solid brass cylinder supplied with two keys. The wide face plate measures 1-1/4" by 8" and the backset is 2-1/2". This heavy-duty lock is rated for both commercial and residential locations.

Replaces narrow-plate mortise locks

The wide face plate covers a larger cut-out than standard narrow plates, making it the correct choice when retrofitting doors previously fitted with 1-1/4" by 8" hardware. The upgrade is worth it when the existing mortise pocket matches the 2-1/2" backset and the door handing is right-hand. It does not suit doors prepared for a different backset or left-hand operation.

Sustained commercial-grade operation

Solid brass plates and a solid brass cylinder resist wear from high-frequency use in commercial settings. The screw-on knob design with swivel spindle maintains alignment under repeated leverage. Deadbolt throw is 1 inch, operated by key outside and thumb turn inside. The lockset is not designed for electronic access control integration or fire-rated door assemblies requiring specific certifications.

How it compares

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

Price $91.99
Pricier than about 63% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameEm-D-Kay
Product lineMarks 91A/3-X Like
Model name5100XR
Product typeMortise Entry Lock Set - Surface Mounted Screw-on Knobs
Design styleKnobs
Size & build
Surface finishPolished Brass
Main materialBrass
Backset distance2-1/2 in
More details
Security gradeHeavy Duty
Location typeCommercial/Residential
Lock keyingKeyed Different
Main functionEntrance

Questions about this item

What mortise pocket dimensions does the 2-1/2" backset and 1-1/4" x 8" wide face plate require?

The lock needs a mortise pocket cut for a 2-1/2" backset measured from the door edge to the spindle centre, with a face plate recess 1-1/4" wide by 8" tall to sit flush.

Which step is most often missed when fitting the screw-on knobs with swivel spindle on this right-hand mortise set?

Installers often forget to orient the swivel spindle for right-hand operation before tightening the knob set screws, causing the latch to bind or retract backwards.

When will the solid brass cylinder or its two keys need replacement on this heavy-duty entrance lock?

Replace the cylinder if the keyway wears enough to cause sticking or if a key is lost and master-keying is not available; otherwise the brass cylinder typically outlasts the door.

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