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Steel swivel spindle, satin chrome finish, 3/8 inch square by 5 inch long

Tuff Stuff

Tuff Stuff 4525 Swivel Spindle 3/8" Square x 5" Long door lock

SKU CH-F8B4-5SVS5 MPN 4525

A steel swivel spindle measuring 3/8" square by 5" long with tapped holes on both sides, threaded 1/2-20 TPI, designed as a heavy-duty replacement for Progressive #2638 knob sets

  • FinishSatin Chrome
  • Selling UnitBox
  • KeyingKeyed Different
  • Heavy-duty steel construction withstands frequent use
  • 3/8" square by 5" length fits standard door assemblies
  • Swivel design allows smooth knob operation
  • Threaded 1/2-20 TPI with tapped holes ensures secure mounting
  • Direct replacement for Progressive 2638 brass knob set

Direct replacement for Progressive 2638

The Tuff Stuff 4525 swivel spindle matches the Progressive #2638 brass knob set. It measures 3/8" square by 5" long with 1/4" tapped holes on both ends. The 1/2-20 thread pitch fits the original hardware exactly. Steel construction replaces the softer brass component.

Steel build with satin chrome finish

Heavy-duty steel resists bending under daily torque better than the original brass. Satin chrome surface withstands repeated handling without visible wear. Swivel action allows the knob to rotate freely while the spindle stays fixed in the lock body. Tapped holes on both sides accept standard set screws securely.

Upgrade when brass spindle strips or snaps

Install this spindle when the existing brass part rounds out or breaks inside the lock. The steel core prevents the failure mode that affects the original material. Buyers who need a different length or square dimension should look elsewhere. The part is sold individually, not as a paired set.

Highlights

  • Heavy-duty steel construction withstands frequent use
  • 3/8" square by 5" length fits standard door assemblies
  • Swivel design allows smooth knob operation
  • Threaded 1/2-20 TPI with tapped holes ensures secure mounting
  • Direct replacement for Progressive 2638 brass knob set

Specifications

BrandTuff Stuff
Model4525
FinishSatin Chrome
Selling UnitBox
KeyingKeyed Different

Questions about this item

What thread standard does the 1/2-20 TPI swivel spindle use?

The spindle uses a 1/2-20 TPI thread standard for secure attachment to compatible hardware.

What door thickness does the 5" long spindle accommodate?

The 5" length fits standard residential door thicknesses and works with the Progressive #2638 knob set.

How do you align the tapped holes during installation?

Insert the spindle through the latch mechanism, then rotate each end until the 1/4" tapped holes align with the knob set screws.

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