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Silver threaded disc retainer nut, pack of 10

3M

3M 5621 Disc Retainer Nut 1/2in 11 Thread PK10

SKU CH-M130-8JQAV MPN 5621

Pack of ten 1/2-inch disc retainer nuts with 11-thread for sander backing pads

  • Product typeSanders
  • Secure disc attachment with 1/2in 11-thread retainer nut
  • Pack of 10 nuts supports extended workshop use
  • Compatible with 5/8in-11 connector threaded holes
  • Silver finish resists corrosion in demanding environments
  • Designed for round backup pads on sanding tools

Product Identity

The 3M 5621 Disc Retainer Nut is a silver‑coloured replacement nut designed for 5/8‑11 threaded sanders. It secures fiber discs on round backup pads and is sold in a pack of 10 for workshop or fleet maintenance.

Thread Compatibility

The nut fits only tools with a 5/8‑11 internal thread; it will not engage other thread pitches or diameters. No quick‑change mounting system is supported, so the disc must be threaded on manually each time.

Installation Notes

Installation is a simple hand‑tighten onto the sander spindle; no special tools are required. The most common issue is cross‑threading if the nut is started at an angle, which can damage both the nut and the tool spindle.

How it compares

Measured against everything we stock in Sanders, Rotary & Demolition Tools, at today’s prices. Recalculated every night.

Price $54.99
Pricier than about 71% of the 477 comparable items (median $21.99).

Specifications

Product
Brand name3M
Model name5621
Product typeSanders

Questions about this item

Should I buy the pack of 10 retainer nuts or look for a different quantity?

The product is supplied as a pack of 10 nuts, model 5621, so you receive ten pieces in one package.

What does the 1/2 in overall length mean when the nut is fitted to my sander?

The nut measures 1/2 in overall length, so it adds that much axial height to the disc stack on your backup pad.

How does the 5/8 in.-11 threaded hole limit which backup pads I can use?

The nut accepts a 5/8 in.-11 thread, so it only fits backup pads or spindles with that exact thread size.

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