Home · FSC 5331 O-Ring · NSN 5331-00-700-0639

NSN 5331-00-700-0639 — O-Ring

NIIN 00-700-0639 · unit of issue EA · AAC J (not stocked, central procurement) · source of supply SMS

Buying rhythm

from 4 government buys since 2019

The government has bought this item about every 1.4 years (irregular, gaps vary ±100%). Last buy Sep 21, 2026. The gaps are too uneven to put a window on the next one.

How well this works: for irregular items, "next buy about one typical gap after the last, give or take 151 days" caught the actual next buy 31% of the time across 21,161 past buys, against 24% for a fixed "one year later" guess. A rhythm, not a schedule: DLA buys when stock and demand say so. Every item due for a buy now.

NSN 5331-00-700-0639 is the national stock number for an o-ring in federal supply class 5331 (O-Ring). It cross-references to 2 manufacturer part numbers from 2 CAGE codes, including Sae International, Military Standards Promulgated By Military Departments Under Authority Of Defense Standardization Manual 4120 3-M; the primary is MS29561-272. The unit of issue is EA and the FLIS list price is $53.28.

The U.S. government has bought this item 7 times on record, 4 of them in the last 24 months, most recently on September 23, 2026 for $364 from Dbr Industries, Inc.. The median unit price paid over 36 months is $13.29. No seller has confirmed stock of it here in the last 60 days; watching the number is free and the first listing triggers an alert.

part numbers from 2 CAGEs

open solicitations, all agencies

government buys in 24 months · median $13.29

sellers with confirmed stock

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Cross-references

Part numbers filed against this stock number, with the manufacturer (CAGE) and the FLIS reference codes.

Part number	CAGE	Manufacturer	Reference	Variation
MS29561-272	0U583	Sae International	3 · Design control (vendor)	2 · Fully interchangeable
SAE-AS29561	0U583	Sae International	3 · Design control (vendor)	1 · Not fully interchangeable
MS29561-272	96906	Military Standards Promulgated By Military Departments Under Authority Of Defense Standardization Manual 4120 3-M	5 · Secondary reference	9 · Reference only

Government demand

Nothing open right now. Last government buy Sep 23, 2026. Watch this NSN and we will email you when it is solicited.

What the government paid

Date	Vendor	Qty	Unit cost	Amount	Buyer	Reference
Sep 23, 2026	Dbr Industries, Inc. 1K697			$364	Dla	SPE7L126V234Q » Award/Basic Package View
Sep 21, 2026	Blade Industrial Products Inc 1JYT1			$742	Dla	SPE7L126P9H86 » Award/Basic Package View
Aug 25, 2026	Dbr Industries, Inc. 1K697	30	$13.29		Dla	SPE7L026V1507
Aug 25, 2026	Dbr Industries, Inc. 1K697			$399	Dla	SPE7L026V1507
Dec 3, 2020	Dbr Industries, Inc. 1K697	3	$40.00		Dla	SPE7L121V1805
Jul 9, 2019	Dbr Industries, Inc. 1K697	33	$11.35		Dla	SPE5E819V7531
Mar 28, 2003	Dbr Industries, Inc. 1K697	100	$2.45		Dla	SP054003MD776

Sources: DLA DIBBS procurement history (unit cost), DLA award history, FPDS (all agencies), SAM.gov notices. 7 buys on record in total.

Sellers with confirmed stock

No seller has confirmed stock on this NSN in the last 60 days. Watch it and we will email you when one does, or request a quote on MS29561-272.

Listings appear here only while the seller has confirmed them within 60 days. Sellers: list this part free.

DLA management data

FLIS unit price: $53.28
Unit of issue: EA
Acquisition advice: J — Not stocked, central procurement
Source of supply: SMS
Shelf life code: Y
Effective: Oct 1, 2025

Item characteristics

Outside Diameter: INCHES NOMINAL 9.762
Cross-Sectional Height: INCHES MINIMUM 0.135 AND INCHES MAXIMUM 0.143
Center Hole Diameter: INCHES MINIMUM 9.454 AND INCHES MAXIMUM 9.514
Elongation Percentage: MAXIMUM 250
Hardness Rating: SHORE DUROMETER A NOMINAL 70.0
Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR

Related stock numbers

Other NSNs filed under the same part numbers.

00-003-9334 · O-Ring
00-004-1512 · O-Ring
00-004-7173 · O-Ring
00-022-4151 · O-Ring
00-057-6953 · O-Ring
00-061-2209 · O-Ring
00-061-2724 · O-Ring
00-064-4641 · O-Ring

About this page

An NSN is 13 digits: the 4-digit Federal Supply Class and the 9-digit NIIN. Cross-references come from the federal logistics record; demand from DLA DIBBS, SAM.gov and FPDS; ADs from the Federal Register. Refreshed nightly. Market Pulse shows the whole market.