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Pair of polished brass solid door knobs with straight spindle

WILSON SUPPLY

WILSON SUPPLY Tuff Stuff 6043 TUF40 Polished Brass Door Knob Set

SKU CH-4RTV-443JT

Solid brass door knob pair with 3-1/2" spindle fits Marks surface-mount mortise locksets 91A and 71A

  • FinishPolished Brass
  • Selling UnitPair
  • TypeDoor Knob
  • Features3-1/2" straight spindle
  • MaterialSolid Brass
  • Polished brass finish resists tarnish and matches classic décor
  • Solid brass construction provides lasting strength for daily use
  • 3-1/2" straight spindle fits Marks 91A and 71A mortise locksets
  • 20 TPI threading ensures secure spindle engagement
  • Trusted replacement knob chosen for over 60 years

Polished Brass Door Knob Set

The Wilson Supply Tuff Stuff 6043 TUF40 is a solid brass door knob pair finished in polished brass. It is designed for use with Marks surface mount mortise locksets including the 91A and 71A models. The 2-1/4 inch diameter knobs suit residential and light commercial doors requiring a traditional look.

3-1/2 Inch Straight Spindle Included

Each box contains one pair of knobs supplied with case hardened set screws and a 3-1/2 inch straight spindle. The spindle uses a standard 20 threads per inch pitch for secure engagement with compatible mortise lock bodies. No additional hardware is required for installation on supported locksets.

Replacement For Marks 91A And 71A Mortise Locksets

The set directly replaces original knobs on Marks Type Surface Mount 91A and 71A mortise locksets and similar compatible units. It does not fit tubular latchsets, cylindrical locksets or mortise locks with non-standard spindle threads. Buyers needing a different spindle length or thread pitch must source alternative hardware.

Highlights

  • Polished brass finish resists tarnish and matches classic décor
  • Solid brass construction provides lasting strength for daily use
  • 3-1/2" straight spindle fits Marks 91A and 71A mortise locksets
  • 20 TPI threading ensures secure spindle engagement
  • Trusted replacement knob chosen for over 60 years

Specifications

FinishPolished Brass
Selling UnitPair
TypeDoor Knob
Features3-1/2" straight spindle
MaterialSolid Brass
SeriesKnobs

Questions about this item

Will the 3-1/2" straight spindle need replacement if the door thickness changes?

The spindle is case-hardened and fixed at 3-1/2"; a different door thickness would require a new spindle of the correct length.

What limits continuous operation of the 20 TPI spindle thread?

The 20 threads-per-inch spindle engages the mortise lockset; heavy daily use can wear the thread profile before the solid brass knob shows wear.

Does the polished brass finish generate heat or noise during all-day use?

No — the knob set is passive hardware with no moving parts that produce heat or audible sound during normal operation.

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