Aerospace O-ring family, fluorocarbon, AMS7276
AS3209 O-rings: fluorocarbon 70 to 80 to AMS7276
AS3209-XXX is a fluorocarbon (FKM) O-ring made from AMS7276 material, in the standard AS568 size the dash names, and AS3208-YY is the same material in the straight-thread boss sizes. AMS7276 is the high-temperature, fluid-resistant, low compression set fluorocarbon in the 70 to 80 hardness class, for seals in fuel systems and specific engine oil systems. SAE lists AS3209 and AS3208 as Stabilized; DLA ASSIST lists AMS7276 as Active and prints a non-government qualified products list against it, one held by SAE rather than in the DLA database.
- Polymer
- Fluorocarbon (FKM)fuel and engine oil systems
- Durometer
- 70 to 80the AMS7276 class
- Current drawings
- AS3209C, AS3208Aboth stabilized
- QPL
- SAE non-governmenton AMS7276
Specification: documents, status, material
| Item | Value | Source |
|---|---|---|
| Standard-size drawing | SAE-AS3209 on AMS7276: Stabilized; current revision AS3209C, 2021-08-03 (issued 1976, reaffirmed 2013, revised 2017, stabilized August 2021) | SAE Mobilus, read 2026-09-27 |
| Boss-size drawing | SAE-AS3208 on AMS7276: Stabilized; current revision AS3208A, 2020-05-12 (issued 1976, reaffirmed 2013, stabilized May 2020) | SAE Mobilus, read 2026-09-27 |
| Material document | SAE-AMS7276, fluorocarbon 70 to 80, high-temperature fluid resistant, low compression set (the DLA ASSIST title; SAE prints very low), for seals in fuel systems and specific engine oil systems: Active (DLA ASSIST 2023-01-17); SAE Mobilus prints AMS7276J, 2020-05-18 | DLA ASSIST ident 105727, read 2026-09-24; SAE Mobilus, read 2026-09-25 |
| Related drawing | SAE-AS83248/1, O-ring molded from AMS7276 material: Reaffirmed; current AS83248/1A, revised October 2016, reaffirmed 2021-11-08 | SAE Mobilus, read 2026-09-27 |
| Base polymer | Fluorocarbon (FKM) | document titles |
| Durometer | 70 to 80, the hardness class in the AMS7276 title; manufacturers supply it at 75 | SAE Mobilus title; Parker® ORD 5700 (2021) |
| Slash sheets / classes | None; two drawings on one material document | DLA ASSIST ident 105727, read 2026-09-24; SAE Mobilus, read 2026-09-27 |
| Boss variant | AS3208-YY, mapping to AS568-9YY | Freudenberg Sealing Technologies, Aerospace Part and Material Cross-Reference (brochure, July 2024), page 3, read 2026-09-27 |
| QPL | AMS7276: Non-government QPL, an SAE-held list, not in the DLA QPD | DLA ASSIST qualification line |
| Service | Fuel systems and specific engine oil systems (the AMS7276 title) | document title |
| Compounds manufacturers pair with this document | Parker ORD 5700 (2021) Table 8-4 pairs V1164-75 with AMS7276 in the 70 to 80 band | Parker ORD 5700 (2021) |
Status strings are quoted as DLA ASSIST and SAE Mobilus print them (Canceled is ASSIST's spelling; Inactive means inactive for new design; Withdrawn is SAE's word). Conquest Seal is a distributor and is not itself listed on any qualified products list.
Designator to AS568 size
AS3209-XXX is the AS568-XXX size and AS3208-YY the boss size AS568-9YY, per Freudenberg Sealing Technologies' Aerospace Part and Material Cross-Reference (brochure, July 2024, page 3, read 2026-09-27). AS83248/1-XXX and M83248/1-XXX use the same three-digit dash on the same AMS7276 material.
| AS3209 | AS568 dash | ID in | W in | ID mm | W mm |
|---|---|---|---|---|---|
| AS3209-006 | AS568-006 | 0.114 | 0.070 | 2.90 | 1.78 |
| AS3209-010 | AS568-010 | 0.239 | 0.070 | 6.07 | 1.78 |
| AS3209-012 | AS568-012 | 0.364 | 0.070 | 9.25 | 1.78 |
| AS3209-112 | AS568-112 | 0.487 | 0.103 | 12.37 | 2.62 |
| AS3209-114 | AS568-114 | 0.612 | 0.103 | 15.54 | 2.62 |
| AS3209-116 | AS568-116 | 0.737 | 0.103 | 18.72 | 2.62 |
| AS3209-210 | AS568-210 | 0.734 | 0.139 | 18.64 | 3.53 |
| AS3209-214 | AS568-214 | 0.984 | 0.139 | 24.99 | 3.53 |
| AS3209-222 | AS568-222 | 1.484 | 0.139 | 37.69 | 3.53 |
| AS3209-325 | AS568-325 | 1.475 | 0.210 | 37.47 | 5.33 |
Millimeter values are converted from the inch table. The dash is a size lookup and never a material; the same dash on another family on the mil-spec hub is the same size in a different document. Full chart: AS568 size chart.
AS3209 and AS3208 part numbers with their own page
Each of the 29 part numbers below has its own page: the size in inches and millimeters with tolerances, the document it is procured to, its status and the same size under the other documents. Open a series to find the dash on your print.
AS3209
AS3209 part numbers, 0xx series (6)
AS3209-009, AS3209-012, AS3209-016, AS3209-020, AS3209-042, AS3209-044
AS3209 part numbers, 1xx series (8)
AS3209-112, AS3209-116, AS3209-117, AS3209-147, AS3209-150, AS3209-152, AS3209-154, AS3209-155
AS3209 part numbers, 2xx series (9)
AS3209-216, AS3209-232, AS3209-235, AS3209-237, AS3209-239, AS3209-243, AS3209-244, AS3209-247, AS3209-257
AS3209 part number, 3xx series (1)
AS3209 part number, 4xx series (1)
Where the documents stand
This family is SAE-native: AS3209 and AS3208 are size sheets whose material is AMS7276, and SAE issued both in 1976. SAE has since stabilized them: AS3208 at revision A on 2020-05-12 and AS3209 at revision C on 2021-08-03. AMS7276 is one of the four SAE successors that DLA ASSIST names for the cancelled MIL-R-83248. When the O-ring sheet MIL-R-83248/1 was cancelled in 2008, its cancellation notice pointed future purchases of the M83248/1 O-rings to AS3209 and of its boss sizes to AS3208; SAE's AS83248/1, an O-ring molded from AMS7276 material, came later.
AS3209 and AS83248/1 are two SAE drawings on the same AMS7276 material and the same AS568 dashes. The 2008 notice tells users to evaluate a replacement for their own application, so whether an AS3209 part can stand in for an M83248/1 or AS83248/1 callout, or the reverse, is the print owner's decision. The drawing the print names is the one quoted.
The base polymer
The polymer behind this family is fluorocarbon (FKM). The Parker O-Ring Handbook ORD 5700 family range for Viton® (FKM) (section 2.2, read 2026-09-14) is -26 C to 204 C; that is the polymer family's range, not this document's requirement, and the compound sheet for the qualified grade governs. Parker notes that specification temperature limits do not necessarily represent operating temperature limits.
Material page: Fluorocarbon (FKM) O-rings. Temperature ranges by family: O-ring temperature ranges.
How we quote this family
Send the designator as printed, AS3209-XXX or AS3208-YY, with the dash, the quantity and the certification the order needs. We quote it supplied against the AS drawing in an AMS7276 compound made by manufacturers on the SAE qualified products list, with a certificate of conformance and lot traceability. If the print names a compound number, include it and we quote that compound.
Related pages
Other families: MS28775, M83461/1, M83248/1 and M83248/2, M83485/1, M25988/1, /2, /3 and /4, MS29513 and MS29512, NAS1611 and NAS1612, AS3582, AS9386 and AS9385.
Frequently asked
What is AS3209 and what material does it specify?
AS3209 is an SAE aerospace O-ring size sheet whose material is AMS7276: fluorocarbon (FKM), 70 to 80 hardness, high-temperature and fluid resistant with low compression set, for seals in fuel systems and specific engine oil systems. SAE lists it as Stabilized, at revision C of 2021-08-03. Parker ORD 5700 (2021) pairs V1164-75 with AMS7276.
What is the difference between AS3209 and AS3208?
Size series. AS3209-XXX carries the standard AS568 sizes with a three-digit dash, and AS3208-YY carries the straight-thread boss sizes with a two-digit dash that maps to AS568-9YY. Both are AMS7276 fluorocarbon.
How does AS3209 relate to M83248/1?
Both are fluorocarbon O-rings on the AMS7276 compound document in the same AS568 sizes. M83248/1 was the MIL slash sheet; the notice that cancelled it in 2008 pointed future purchases of its O-rings to AS3209 and of its boss sizes to AS3208. SAE later issued AS83248/1, whose title reads O-ring molded from AMS7276 material, as a separate drawing. We quote the drawing the print names and leave interchange to the print owner.
Does AMS7276 have a QPL?
Yes, a non-government one: DLA ASSIST prints Non-government QPL against SAE-AMS7276, meaning the qualified products list is held by SAE rather than in the DLA database. We supply parts made by the listed manufacturers and the listing appears on the certification. Conquest Seal is a distributor and is not itself on the list.
Related guides
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; Parker O-Ring Handbook ORD 5700 (2021), Table 8-4, for the compound pairing, read 2026-09-24; Parker O-Ring Handbook ORD 5700, 2021 printing, section IX, AS568 size tables, pages 9-2 to 9-11, read 2026-09-27. Facts are stated in our own words and our own arrangement; no standard's text or table and no manufacturer's cross-reference table is reproduced. Compound pairings are the named manufacturer's published statements, not qualified products list entries.
Parker is a trademark of Parker Hannifin Corporation. No affiliation or endorsement is implied.
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Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Need AS3209 and AS3208 with certification?
Send the designator as the print reads it, the dash, the quantity and the paperwork the order needs. A Conquest representative replies with the part quoted against the document. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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