Part Number
Ring Spacer · Federal specification · NSN 5365-00-538-0881
| Part number | QQ-S-631 |
|---|---|
| Specification family | Federal specification |
| Item name | Ring Spacer |
| Unit of issue | EA |
| Cross-referenced NSN | 5365-00-538-0881 |
| Federal Supply Class (FSC) | 5365 — Rings, Shims, and Spacers |
| Unit price (USD) | $35.04 |
| Country of origin | Türkiye (Turkey) |
| Lead time | Within 90 days of order |
| Minimum order | May apply — confirm on quote |
| Documentation | Source documentation provided on all orders |
Characteristics decoded from the federal cataloging record for this ring spacer. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Hardness Rating | 75.5 Rockwell Superficial 30-N Nominal |
|---|---|
| Material | Steel |
Retaining rings, snap rings, shims, spacers, and bushings used to locate, retain, and adjust the position of components on shafts and in bores.
Reading the part number. QQ-S-631 is a federal specification reference (the QQ series covered specific commodity groups in the old federal spec system). Like all spec citations it describes a family of conforming items; the NSN on this page identifies the specific ring spacer stocked.
Price in context. Across the 167 items we currently stock in FSC 5365 (Rings, Shims, and Spacers), published unit prices run from $0.27 to $3,300.00. At $35.04, this item sits above the class median of $29.79.
Stock activity. This item has appeared once in our supplier stock feed, most recently listed 2026-08-21, with a lot quantity of 391 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.
Who orders QQ-S-631. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5365-00-538-0881. You can order by part number or by stock number — it is the same item, the same published price, and the same quote form.
Applicable standards. ANSI B27.7 retaining rings, MS/NAS shims and spacers.
Need this part modified, or a similar part made to your print? See our U.S.-based CNC machining services and aerospace machining capability.
Country of origin: Türkiye (Turkey) — a DFARS qualifying country. Türkiye is a NATO ally with a reciprocal defense procurement agreement with the U.S. Department of Defense, making it a qualifying country under DFARS 225.003. On DoD and DLA solicitations, qualifying-country end products are evaluated without Buy American price penalties — they compete on par with domestic product — and DoD trade-agreements clauses (DFARS 252.225-7021) expressly accept qualifying-country end products.
Dollar thresholds. The Trade Agreements Act only applies to supply contracts at or above $174,000 (the WTO GPA threshold effective March 2026); below that — where the vast majority of hardware buys fall — the TAA does not apply at all. The main exclusion is civilian-agency solicitations at or above that threshold that restrict award to TAA designated-country products (Türkiye is not TAA-designated). Buyers are responsible for confirming the origin requirements of their specific solicitation.
Full country-of-origin and source documentation is provided with every order. Fulfillment within 90 days of order. Minimum order may apply.
Items are supplied as stock mil-spec / commercial hardware with source documentation and country-of-origin paperwork on every order. Parts are not supplied with an FAA Form 8130-3 airworthiness tag unless expressly stated on the quote. Buyers installing hardware on certificated aircraft are responsible for acceptance under their own maintenance program, repair station procedures, or owner/operator authority.
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