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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

  • Lock keyingKeyed Different
  • Surface finishSatin Chrome
  • Sold asBox
  • 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.

How it compares

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

Price $9.99
Cheaper than about 90% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameTuff Stuff
Model name4522
Size & build
Surface finishSatin Chrome
More details
Lock 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.

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