PSC 5331: O – Ring
5331 is the product and service code (PSC) federal agencies use for o – ring, in the hardware and abrasives group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 6
Open contracts with PSC 5331, due soonest
- O-RING
✦ NAVSUP Weapon Systems Support (Mechanicsburg) is buying an O-ring, part number MS28775-473 (CAGE 81343).
Due in 13 daysOct 22, 2026
- O-RING
✦ NAVSUP Weapon Systems Support (Navy, Mechanicsburg PA) wants to buy O-rings (P/N 2244739, CAGE 10001) built to Government drawings.
Due in 17 daysOct 26, 2026
- O-RING
✦ NAVSUP Weapon Systems Support (Mechanicsburg) wants to buy an O-RING made to SAE AS3581 (P/N AS3581-232) for use in a Seal Delivery Vehicle, a critical shipboard system.
Due in 21 daysOct 30, 2026
- O-RING
✦ The Navy (NAVSUP Weapon Systems Support) wants to buy an O-ring made to SAE AS3581, part number AS3581-232, for a Seal Delivery Vehicle.
Due in 21 daysOct 30, 2026
- FD2020-22-00058-00
Due in 24 daysNov 3, 2026
- PACKING, PREFORMED
✦ The Navy's NAVSUP Weapon Systems Support office in Mechanicsburg, PA wants quotes on preformed packing (a seal or gasket part).
Due in 27 daysNov 5, 2026
Where 5331 sits in the PSC Manual
- Category: Product
- Group 53: Hardware and Abrasives
- Code 5331: O – Ring
NAICS codes used with PSC 5331
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with 5331 most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 336310 | Motor Vehicle Gasoline Engine and Engine Parts Manufacturing | On 5 open |
Related PSC codes
- 5305 Screws
- 5306 Bolts
- 5307 Studs
- 5310 Nuts and Washers
- 5315 Nails, Machine Keys, and Pins
- 5320 Rivets
- 5325 Fastening Devices
- 5330 Packing and Gasket Materials
- 5335 Metal Screening
- 5340 Hardware, Commercial
Frequently asked questions
What is PSC 5331?
5331 is the product code in the federal Product and Service Code (PSC) Manual for o – ring, under 53 (Hardware and Abrasives). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC 5331?
Most federal contract dollars under PSC 5331 go with NAICS 336310 (Motor Vehicle Gasoline Engine and Engine Parts Manufacturing), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC 5331?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 6 open notices use PSC 5331 right now. FedReady can match new ones to your business and email you, free.