We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • FinishSatin Chrome
  • Selling UnitBox
  • KeyingKeyed Different
  • 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.

Highlights

  • 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

Specifications

BrandTuff Stuff
Model4425
FinishSatin Chrome
Selling UnitBox
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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.