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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

  • 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.

Highlights

  • 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

Specifications

TypeSanders
Brand3M
Model5621

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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