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Pair of satin chrome solid brass door knobs with spindle

Tuff Stuff

Tuff Stuff TUF46 Satin Chrome 26D Door Knob Set

SKU CH-BWCK-1MH9R MPN TUF46

Satin Chrome solid brass knob pair with 20 TPI spindle fits Marks 91A and 71A surface-mount mortise locksets

  • FinishSatin Chrome
  • Satin Chrome 26D finish resists corrosion
  • 2-1/4 inch solid brass knobs provide durable grip
  • 20 TPI standard spindle fits Marks mortise locksets
  • Compatible with Marks 91A and 71A surface mount locksets
  • Popular replacement knob trusted for over 60 years

Solid Brass Knob Set for Marks Mortise Locks

The Tuff Stuff TUF46 is a 2-1/4 inch diameter solid brass door knob pair finished in satin chrome 26D. It includes a 3-1/2 inch straight spindle and case hardened set screws. The set is designed specifically for Marks surface mount mortise locksets such as the 91A and 71A types.

Ideal for Restoring Original Hardware

This knob set suits owners of older Marks mortise locks who need a direct replacement that matches the original spindle threading. Builders fitting modern tubular latchsets or any lock requiring a different spindle diameter or thread pitch should look elsewhere.

20 TPI Spindle Thread Determines Compatibility

The supplied spindle uses a standard 20 threads per inch pitch. This single specification decides whether the knobs will engage correctly with the mortise lock body. Verify the existing lock requires 20 TPI before purchasing.

Highlights

  • Satin Chrome 26D finish resists corrosion
  • 2-1/4 inch solid brass knobs provide durable grip
  • 20 TPI standard spindle fits Marks mortise locksets
  • Compatible with Marks 91A and 71A surface mount locksets
  • Popular replacement knob trusted for over 60 years

Specifications

BrandTuff Stuff
ModelTUF46
FinishSatin Chrome

Questions about this item

What spindle standard does the TUF46 knob set use, and what thread count does that limit?

The set ships with a 3-1/2" straight spindle built to 20 TPI, so it only fits mortise locksets that accept a 20 threads-per-inch spindle.

What physical dimensions must the door and lockset accommodate for the TUF46 to mount correctly?

Each knob measures 2-1/4" in diameter and is made of solid brass, requiring a door thickness and bore that accept that size and the included case-hardened set screws.

How is the TUF46 installed, and which step is most often done incorrectly?

Insert the supplied spindle through the mortise lock body, slide both knobs on, then tighten the case-hardened set screws firmly; the common mistake is leaving the set screws loose, which lets the knobs rotate freely.

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