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Polished brass closet spindle with zinc die-cast turn, 9/32 inch square by 3-1/4 inch long, 3/8"-20 threads

Progressive Hardware Co., Inc.

Progressive Hardware Co., Inc. 33BP door lock spindle 9/32" x 3-1/4" 3/8"-20 TPI

SKU CH-TCSW-6GZ4J MPN 33BP

A brass-plated closet spindle with a 9/32" square by 3-1/4" long shaft and 3/8"-20 threading for secure door-lock operation

  • FinishPolished Brass
  • Polished brass finish resists corrosion and matches period hardware
  • 9/32 inch square shaft fits standard closet lock mechanisms
  • 3-1/4 inch length suits typical door thicknesses
  • 3/8 inch 20 TPI threading ensures secure knob attachment
  • Zinc die-cast turn provides durable operation for daily use

Closet Spindle Replacement

The Progressive Hardware 33BP is a brass-plated closet spindle designed as a direct replacement for worn or broken hardware. It fits standard closet door locks that accept a 9/32 inch square spindle measuring 3-1/4 inches in length. The zinc die-cast turn provides a durable operating surface for daily use. Homeowners and maintenance staff can install it without specialised tools.

Threaded Connection Detail

The spindle features a 3/8"-20 TPI thread pattern that engages securely with compatible lock mechanisms. Brass plating on the zinc die-cast turn resists corrosion and wear from repeated handling. Normal operation generates no heat, noise or power draw because the component is entirely mechanical. The polished brass finish maintains its appearance through regular cycles of locking and unlocking.

Installation Fit Requirements

This spindle requires a lock body with a matching 9/32 inch square broach and 3/8"-20 internal threads to function correctly. It frees up a stuck or stripped closet door by restoring the mechanical link between the turn knob and the latch bolt. Builders should verify the existing spindle dimensions and thread pitch before ordering. The part does not suit locksets that use a different square size or thread standard.

Highlights

  • Polished brass finish resists corrosion and matches period hardware
  • 9/32 inch square shaft fits standard closet lock mechanisms
  • 3-1/4 inch length suits typical door thicknesses
  • 3/8 inch 20 TPI threading ensures secure knob attachment
  • Zinc die-cast turn provides durable operation for daily use

Specifications

BrandProgressive Hardware Co., Inc.
Model33BP
FinishPolished Brass

Questions about this item

How do I install the 9/32" square spindle into the closet lock and what step is often missed?

Insert the 9/32" square end through the latch hub, then thread the 3/8"-20 TPI turn piece onto the spindle until the knob sits flush; the missed step is tightening the set screw on the knob collar so the spindle cannot rotate independently.

What maintenance or replacement will the brass-plated zinc turn need over time?

The brass plating on the zinc die-cast turn can wear through with heavy use; when the finish dulls or the 3/8"-20 threads strip, replace the entire #33BP spindle assembly.

What limit appears first when the closet spindle sees sustained daily operation?

The 9/32" square section will round off inside the latch hub before the 3/8"-20 threads fail, causing the knob to spin without retracting the bolt.

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