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Straight steel spindle with satin chrome finish

Tuff Stuff

Tuff Stuff 4425 Door Lock Spindle 9/32" Square x 5" 20 TPI Steel

SKU CH-6QFW-BZ51W MPN 4425

Straight steel spindle measuring 9/32 inch square by 5 inches long with 20 threads per inch

  • Lock keyingKeyed Different
  • Surface finishSatin Chrome
  • Sold asBox
  • Straight spindle fits vintage knobs directly
  • 9/32" square profile matches original hardware
  • 5" length spans standard door thicknesses
  • 20 TPI threading secures both knob ends
  • Steel construction resists daily wear longer

Replacement Spindle for Vintage Hardware

The Tuff Stuff 4425 is a straight steel spindle measuring 9/32 inch square by 5 inches long with 20 threads per inch on both ends and an unthreaded centre section. It is supplied in a box with a satin chrome finish and keyed-different configuration for individual lock operation.

Suitable for restoration projects

This spindle fits Corbin Russwin, Yale, Marks, Norwalk, National, Baldwin and Tuff Stuff vintage door knobs that accept a 9/32 inch square shaft. Installers working with modern tubular latch mechanisms or metric-dimension hardware will find the dimensions incompatible and should select a different part.

Critical dimension is the 9/32 inch square shaft

The square cross-section and 20 TPI threading determine whether the spindle engages the lock hub and secures the knob roses correctly. Verify that the existing hardware requires this exact square size and thread pitch before purchasing.

How it compares

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

Price $1.99
Cheaper than about 99% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameTuff Stuff
Model name4425
Size & build
Surface finishSatin Chrome
More details
Lock keyingKeyed Different

Questions about this item

How much heat or noise does the 4425 spindle generate during continuous daily use?

The solid steel spindle has no moving parts of its own and produces no measurable heat or noise; any warmth or sound comes from the lock mechanism it operates.

What existing door hardware is required for the 9/32" square 20 TPI spindle to function?

You need a mortise lock or tubular latch with a matching 9/32" square hub and 20 threads-per-inch threaded bosses on both sides of the door.

Will the 5" long straight spindle fit vintage Corbin Russwin or Yale knob sets I want to keep?

Yes — the 4425 is listed as a direct replacement for Corbin Russwin, Yale, Marks, Norwalk, National, Baldwin and most vintage knobs using the same 9/32" square 20 TPI specification.

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