PSC 5310

Overview

The Product Service Code (PSC) system is the U.S. government’s standard taxonomy for classifying what is purchased in federal awards. PSCs are entered and tracked in government procurement systems (e.g., FPDS/SAM) and are maintained through the official PSC Manual to support consistent reporting, analysis, and category management. ¹

PSC 5310 — Nuts and Washers — is a product code in Federal Supply Group 53 (Hardware and Abrasives). It covers nuts and washers, including specially designed forms, across materials such as metal and leather. It includes items like locknuts, wing nuts, plate nuts, and flat, lock, concave/convex, shouldered, split, and keyed washers. Exclusions include bearing thrust washers (PSC 3120) and shims, ring spacers, plate spacers, and lock rings (PSC 5365). ²

See also on G2X:

• G2X — PSC 5310 overview
• G2X — PSC 5305 Screws
• G2X — PSC 5320 Rivets

What this PSC covers

• Nuts, including locknuts, eye nuts, plain, castellated, wing, plate, and push-on varieties. ²
• Washers used as seats for fasteners to distribute pressure and/or prevent movement. ²
• Washer types: flat, lock, concave/convex, shouldered, split, and keyed. ²
• Items “specially designed” as nuts or washers for specific applications. ²
• Materials beyond metal, including leather or other suitable materials when performing a washer function. ²
• Exclusions: bearing thrust washers classified under PSC 3120. ²
• Exclusions: shims, ring spacers, plate spacers, and lock rings classified under PSC 5365. ²

Related NAICS and PSC codes

Type	Code	Descriptor
PSC	5305	Screws 2
PSC	5306	Bolts 2
PSC	5315	Nails, Machine Keys, and Pins 2
PSC	5320	Rivets 2

Classification guidance highlights

• Use PSC 5310 when the supply item is predominantly nuts and/or washers, including specially designed variants. ²
• For orders containing multiple product types, select the PSC that reflects the predominant item purchased per PSC Manual guidance. ²
• Apply exclusions carefully: thrust washers to PSC 3120; shims/spacers/lock rings to PSC 5365. ²

Frequently asked questions

• What items are included under PSC 5310?

  • PSC 5310 includes nuts (e.g., locknuts, wing nuts, plate nuts) and washers (flat, lock, concave/convex, shouldered, split, keyed), including specially designed forms for specific applications. Items may be of metal or other suitable materials when functioning as washers. ²

• Are non-metal washers covered?

  • Yes. Washers made of leather or other suitable materials are included when they perform a washer function, such as serving as a seat for a fastener to distribute pressure or to prevent movement between parts. Classification is based on function rather than material. ²

• How is PSC 5310 different from other hardware PSCs?

  • Bearing thrust washers belong to PSC 3120. Shims, ring spacers, plate spacers, and lock rings belong to PSC 5365. Screws, bolts, rivets, and pins are coded to PSC 5305, PSC 5306, PSC 5320, and PSC 5315, respectively. ²

• Is there an official PSC-to-NAICS crosswalk for PSC 5310?

  • Not specified by official sources ¹.

• Is PSC 5310 a product or a service code?

  • Product. The PSC Manual places 5310 in Section D: Product Codes within Group 53 (Hardware and Abrasives), indicating it is used for tangible supplies rather than services. ²

Useful resources

• G2X — PSC 5310 overview
• Product and Service Code Manual (April 2025), official PDF. ²
• PSC Manual — current/archives and supporting documents. ¹

References

1. Product and Service Code Manual — document library (current and archives), Acquisition.gov. https://www.acquisition.gov/psc-manual
2. Product and Service Codes (PSC) Manual, April 2025 Edition (Section D: Group 53 — includes 5310). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf