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. All three documents are current, and AMS7276 carries an SAE non-government qualified products list.
- Polymer
- Fluorocarbon (FKM)fuel and engine oil systems
- Durometer
- 70 to 80the AMS7276 class
- Current drawings
- AS3209C, AS3208A2021, 2020
- QPL
- SAE non-governmenton AMS7276
Specification: documents, status, material
| Item | Value | Source |
|---|---|---|
| Standard-size drawing | SAE-AS3209 on AMS7276: Reaffirmed 2013, revised since; current revision AS3209C, 2021-08-03 | SAE Mobilus, read 2026-09-06 |
| Boss-size drawing | SAE-AS3208 on AMS7276: current revision AS3208A, 2020-05-12 | SAE Mobilus, read 2026-09-06 |
| 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; SAE Mobilus |
| Related drawing | SAE-AS83248/1, O-ring molded from AMS7276 material (the M83248/1 successor): current AS83248/1A, 2021-11-08 | SAE Mobilus, read 2026-09-06 |
| 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 and SAE Mobilus, read 2026-09-06 |
| Boss variant | AS3208-YY, mapping to AS568-9YY | manufacturers' cross-references |
| 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quoted as DLA ASSIST and SAE Mobilus print them (Canceled is ASSIST's spelling; Inactive means inactive for new design; Withdrawn is SAE's word).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 the manufacturers' cross-references. 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.
Where the documents stand
This family is SAE-native: AS3209 and AS3208 are size sheets whose material is AMS7276, so there is no MIL supersession chain of their own. SAE revised AS3208 to A on 2020-05-12 and AS3209 to C on 2021-08-03. AMS7276 is one of the four SAE successors that DLA ASSIST names for the cancelled MIL-R-83248, and it is also the material behind AS83248/1, the drawing that replaced MIL-R-83248/1; that is how the AS3209 family and the M83248/1 callout come to share a compound document.
AS3209 and AS83248/1 are two SAE drawings on the same AMS7276 material and the same AS568 dashes. Whether a print's AS3209 callout can be satisfied by an AS83248/1 part, 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 on file for Viton® (FKM) 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. It is current 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, cancelled in 2008 and replaced by AS83248/1, whose title reads O-ring molded from AMS7276 material; AS3209 is a separate SAE size sheet on the same material. They are two drawings, so we quote the one 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, ident 105727 (SAE-AMS7276), read 2026-09-06; SAE Mobilus: AS3209C (2021-08-03), AS3208A (2020-05-12), AS83248/1A (2021-11-08), AMS7276J (2020-05-18), read 2026-09-06; Parker O-Ring Handbook ORD 5700 (2021), Table 8-4, for the compound pairing; Manufacturers' aerospace cross-references (2024) for the standard-versus-boss split; AS568 dimensions from this site's size chart. 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.
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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.
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