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
Steel swivel spindle with satin chrome finish, square shaft and removable centers

Tuff Stuff

Tuff Stuff 4522 Steel Swivel Spindle 9/32" Square x 4-3/4" Long 20 TPI 3/8

SKU CH-B6MT-K536R MPN 4522

Steel swivel spindle with two removable centres and tapped ends replaces surface-mount mortise locksets

  • FinishSatin Chrome
  • Selling UnitBox
  • KeyingKeyed Different
  • Swivel design allows smooth door operation
  • 9/32 inch square by 4-3/4 inch length fits standard mortise locksets
  • 20 TPI 3/8 inch threading with two removable centers enables flexible installation
  • Tapped holes on both ends provide secure fastening points
  • Steel construction with satin chrome finish resists wear and corrosion

Steel Swivel Spindle for Mortise Locks

The Tuff Stuff 4522 is a steel swivel spindle built to replace worn parts in surface mount mortise locksets. It suits homeowners and maintenance workers restoring vintage or period-correct door hardware.

9/32 Square Dimensions and Threaded Ends

The spindle measures 9/32 inch square by 4-3/4 inch long with 20 threads per inch on a 3/8 inch diameter. Two removable centres and tapped holes on both ends allow flexible installation but limit use to mortise bodies accepting this exact square profile and thread pitch.

Direct Replacement for Surface Mount Mortise Sets

This part replaces original spindles in surface mount mortise locksets where the square drive and threading match. The jump is worth it when the existing spindle is stripped, bent or missing and the lock case remains serviceable.

Highlights

  • Swivel design allows smooth door operation
  • 9/32 inch square by 4-3/4 inch length fits standard mortise locksets
  • 20 TPI 3/8 inch threading with two removable centers enables flexible installation
  • Tapped holes on both ends provide secure fastening points
  • Steel construction with satin chrome finish resists wear and corrosion

Specifications

BrandTuff Stuff
Model4522
FinishSatin Chrome
Selling UnitBox
KeyingKeyed Different

Questions about this item

Will the 9/32" square spindle fit my existing surface-mount mortise lockset?

The spindle is sized 9/32" square by 4-3/4" long with 3/8"-20 threading, matching the standard dimensions for surface-mount mortise lockset replacements.

How can I confirm the swivel action is working correctly after installation?

Operate the door knob or lever from both sides; the two removable centers should rotate independently, allowing smooth latch retraction without binding.

Does the box include set screws or mounting hardware for the tapped holes?

The spindle comes with two removable centers and tapped holes on both ends; separate set screws or fasteners are not included and must be sourced to match your lockset.

Also in this aisle

People compared these

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