Mil-spec part number, AS3209 and AS3208 family
AS3208-03 O-ring: fluorocarbon (FKM), the AS568-903 size
AS3208-03 is the AS568-903 O-ring size, 0.301 in (7.65 mm) inside diameter by 0.064 in (1.63 mm) cross-section, in fluorocarbon (FKM) procured to SAE AS3208 (AMS7276). The SAE Mobilus record reads: AS3208A stabilized (2020). The dash sets the size and the document sets the compound, so an AS568-903 in another compound is not the same part as AS3208-03. Send the designator exactly as the print reads and we quote it against that document.
- Inside diameter
- 0.301 in7.65 mm, +/- 0.005 in
- Cross-section
- 0.064 in1.63 mm, +/- 0.003 in
- AS568 size
- AS568-903straight-thread boss series
- Document status
- AS3208A stabilized (2020)SAE-AS3208
Part facts
| Item | Value |
|---|---|
| Part number | AS3208-03 |
| NSN | 5331-00-165-1972 (DLA FLIS, read 2026-10-08) |
| Procured to | SAE AS3208 (AMS7276) |
| SAE document | none beyond the document above |
| Status | AS3208A stabilized (2020) |
| Base polymer | Fluorocarbon (FKM) |
| AS568 size | AS568-903 |
| CAD for the AS568-903 size | AS568-903 STEP 3D solid, AS568-903 DXF 2D drawing, AS568-903 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing |
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 0.301 in 7.65 mm | +/- 0.005 in (0.13 mm) |
| Cross-section (W) | 0.064 in 1.63 mm | +/- 0.003 in (0.08 mm) |
| Outside diameter (reference) | 0.429 in 10.91 mm | derived: ID + 2 x W |
Millimeter values are converted from the inch table. The drawing and the document govern; send them with the request.
Same nominal size, other documents
Other part numbers for the AS568-903 size
These part numbers name the AS568-903 nominal size under a different document, so each one is a different compound. They are not interchangeable with AS3208-03 unless the print or the buyer's engineering allows it.
| Part number | Document | Polymer | Status |
|---|---|---|---|
| M83461/2-903 | MIL-P-83461/2 | NBR | Canceled; SAE AS83461/2 adopted by DoD |
| MS29512-03 | MIL-P-5315 (MS29512 boss drawing) | NBR | Canceled (MIL-P-5315); AS29512C current |
| AS9385-03 | SAE AS9385 (AMS7267) | VMQ silicone | Canceled; DoD withdrew its adoption on 2024-02-22, naming SAE-AS9386 |
The base polymer
AS3208-03 is fluorocarbon (FKM). The Parker® O-Ring Handbook ORD 5700 range published for the FKM family (section 2.2) is -26 C to 204 C. That is the polymer family's range, not this document's requirement; the compound sheet for the qualified grade governs.
Material page: Fluorocarbon (FKM) O-rings. Every document in the family: AS3209 and AS3208 O-rings.
Frequently asked
What is the AS568 equivalent of AS3208-03?
AS3208-03 is the AS568-903 size: 0.301 in (7.65 mm) inside diameter by 0.064 in (1.63 mm) cross-section. The dash sets the size; SAE AS3208 (AMS7276) sets the fluorocarbon (FKM) compound. An AS568-903 ring in any other compound has the same dimensions but is not the same part as AS3208-03.
What is the NSN for AS3208-03?
DLA's public FLIS data lists AS3208-03 on NSN 5331-00-165-1972 (read 2026-10-08). An NSN is the federal catalog's number for the item; your contract or print decides what is ordered.
Is SAE-AS3208 still active?
The document status reads: AS3208A stabilized (2020). It comes from the SAE Mobilus record listed under Sources, with the date it was read.
How do I order AS3208-03?
Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. AS3208-03 is quoted and supplied against SAE AS3208 (AMS7276), in the compound the print calls out, with a certificate of conformance with every order. When the print calls out a QPL-listed specification, the finished molded O-ring, or the material it is molded from, comes from a manufacturer listed on that QPL; Conquest supplies it and is not itself on any QPL. A Conquest representative replies within one business day.
Sources
DLA ASSIST document details, idents 105727 (SAE-AMS7276) and 33574 (MIL-R-83248/1), read 2026-09-24, 33573 (MIL-R-83248), read 2026-09-25, and the MIL-R-83248/1A cancellation notice (Notice 5, 2008), read 2026-09-29; SAE Mobilus: AS3209C (stabilized 2021-08-03), AS3208A (stabilized 2020-05-12), AS83248/1A (revised October 2016, reaffirmed 2021-11-08) and AMS7276J (revised 2020-05-18), read 2026-09-27; the NSNs from DLA's public FLIS data (PUB LOG Reference, Identification and Characteristics files, updated 2026-10-01, read 2026-10-08); an NSN is the federal catalog's stock number for an item and does not name or approve a supplier; AS568 dimensions from the Parker O-Ring Handbook ORD 5700, 2021 printing, section IX, AS568 size tables (Series 2-XXX and 3-XXX), pages 9-2 to 9-11, read 2026-10-13; the dash-to-size mapping from the Freudenberg Sealing Technologies, Aerospace Part and Material Cross-Reference brochure (July 2024), pages 3 and 4, read 2026-10-13; the other part numbers' dash-to-size mapping from the MS29512 Revision C sheet (1965-09-01, read 2026-09-27) and MS9385 Revision A sheet (1975-01-17, read 2026-09-27), DLA ASSIST; the other part numbers' statuses from DLA ASSIST document details, ident 5334 (MIL-P-5315), read 2026-09-24; DLA ASSIST document details, ident 71937 (MIL-P-83461/2), read 2026-10-04; SAE Mobilus current-revision records AS29512C and AS9385A, read 2026-09-27; the SAE-AMS-P-83461/2 withdrawal (ident 213940) and SAE-AS83461/2 adoption (ident 277054) records, DLA ASSIST, read 2026-10-04; the SAE-AS9385 withdrawal of adoption notice, DLA ASSIST, read 2026-09-27; the polymers from the Parker O-Ring Handbook ORD 5700A/US, section 8, pages 8-2, 8-4 and 8-5 (read 2026-09-24); Parker O-Ring Handbook ORD 5700A/US, section 2.2, for the polymer family range (read 2026-09-14). Facts are stated in our own words and arrangement; no standard's text or table is reproduced.
Parker is a trademark of Parker Hannifin Corporation; no affiliation or endorsement is implied.
Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Need AS3208-03 with certification?
Send the part number as the print reads it, the quantity and the paperwork the order needs. A Conquest representative replies within one business day. A person answers (714) 632-9830, Pacific business hours.
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