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Satin chrome steel swivel spindle with two removable centers and tapped ends

Progressive Hardware Co., Inc.

Progressive Hardware Co., Inc. 45-20-RTP Swivel Spindle 9/32" x 4-3/4" 20 TPI 3/8

SKU CH-AQD9-Z71SJ MPN 45-20-RTP

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

  • Lock keyingKeyed Different
  • Surface finishSatin Chrome
  • Sold asBox
  • Swivel action reduces binding on mortise locksets
  • 9/32" square steel shaft fits standard door hardware
  • 20 TPI 3/8" threads ensure secure knob attachment
  • Two removable centres allow flexible installation options
  • Tapped holes on both ends speed up replacement fitting

Swivel Spindle for Mortise Locksets

This Progressive Hardware swivel spindle serves as a direct replacement component for surface-mount mortise locksets. It is manufactured from steel with a satin chrome finish and supplied new in a box. The unit features a 9/32" square cross-section and an overall length of 4-3/4 inches. Two removable centres and tapped holes on both ends allow flexible installation on compatible hardware.

Threaded Design Handles Repeated Operation

The spindle uses a 3/8"-20 thread pitch across its tapped ends, providing secure engagement with knob or lever shanks during daily cycling. Steel construction resists deformation when the lock mechanism is actuated frequently. Removable centres let the installer adjust the engagement depth without replacing the entire spindle. The swivel action accommodates slight misalignment between the lock body and the trim.

Square Section Limits Retrofit Options

The 9/32" square profile fits only mortise locksets designed for that specific dimension; it will not engage round or larger square spindle holes. The fixed 4-3/4" length suits standard door thicknesses but cannot be shortened for thinner panels. Compatibility is restricted to surface-mount mortise locksets, so tubular latchsets or cylindrical locks require different hardware.

How it compares

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

Price $13.99
Cheaper than about 80% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameProgressive Hardware Co., Inc.
Model name45-20-RTP
Size & build
Surface finishSatin Chrome
More details
Lock keyingKeyed Different

Questions about this item

Does the 9/32" square steel spindle generate any heat or noise during continuous daily operation?

The spindle is a solid steel mechanical component with no moving electrical parts, so it produces no heat and operates silently under normal use.

What existing lock hardware must I already have for this 20 TPI 3/8" spindle to fit correctly?

You need a surface-mount mortise lockset with a 3/8"-20 threaded hub that accepts a 9/32" square spindle and provides clearance for the 4-3/4" overall length.

Will the two removable centers and tapped holes on both ends work with an older mortise lock body that uses a solid spindle?

Yes, the removable centres allow conversion to a solid spindle, and the tapped ends accept traditional knob or lever setscrews found on vintage mortise hardware.

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