Mil-spec part number, AS3209 and AS3208 family
AS3209-244 O-ring: fluorocarbon (FKM), the AS568-244 size
AS3209-244 is the AS568-244 O-ring size, 4.234 in (107.54 mm) inside diameter by 0.139 in (3.53 mm) cross-section, in fluorocarbon (FKM) procured to SAE AS3209 (AMS7276). The SAE Mobilus record reads: AS3209C stabilized (2021). The dash sets the size and the document sets the compound, so an AS568-244 in another compound is not the same part as AS3209-244. Send the designator exactly as the print reads and we quote it against that document.
- Inside diameter
- 4.234 in107.54 mm, +/- 0.030 in
- Cross-section
- 0.139 in3.53 mm, +/- 0.004 in
- AS568 size
- AS568-2442xx series
- Document status
- AS3209C stabilized (2021)SAE-AS3209
Part facts
| Item | Value |
|---|---|
| Part number | AS3209-244 |
| NSN | 5331-00-165-1962 (DLA FLIS, read 2026-10-08) |
| Stock | In stock in Orange, CA |
| Procured to | SAE AS3209 (AMS7276) |
| SAE document | none beyond the document above |
| Status | AS3209C stabilized (2021) |
| Base polymer | Fluorocarbon (FKM) |
| AS568 size | AS568-244 |
| CAD for the AS568-244 size | AS568-244 STEP 3D solid, AS568-244 DXF 2D drawing, AS568-244 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing |
| Back-up rings | MS28774-244 (single-turn scarf-cut PTFE) or MS27595-244 (continuous PTFE), both procured to SAE AS8791; both drawings are inactive for new design |
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 4.234 in 107.54 mm | +/- 0.030 in (0.76 mm) |
| Cross-section (W) | 0.139 in 3.53 mm | +/- 0.004 in (0.10 mm) |
| Outside diameter (reference) | 4.512 in 114.60 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 AS568-244 size
These part numbers name the AS568-244 nominal size under a different document, so each one is a different compound. They are not interchangeable with AS3209-244 unless the print or the buyer's engineering allows it. At this size the family sheets for MS28775-244, MS29513-244 and AS9386-244 hold a tighter inside-diameter tolerance than AS568.
| Part number | Document | Polymer | Status |
|---|---|---|---|
| MS28775-244 | MIL-PRF-25732 (MS28775 part drawing) | NBR | Inactive (MIL-PRF-25732); AS28775A current |
| M83461/1-244 | MIL-P-83461/1 | NBR | Canceled; AS83461/1C current |
| M83248/1-244 | MIL-R-83248/1 (Class 1) | FKM | Canceled; AS3209C stabilized; AS83248/1A current |
| M83248/2-244 | MIL-R-83248/2 (Class 2) | FKM | Canceled; AS3581A stabilized; AS83248/2A current |
| M83485/1-244 | MIL-R-83485 | FKM, low-temperature grade | Canceled |
| M25988/1-244 | MIL-DTL-25988/1 | FVMQ | Active |
| M25988/2-244 | MIL-DTL-25988/2 | FVMQ | Active |
| M25988/3-244 | MIL-DTL-25988/3 | FVMQ | Active |
| M25988/4-244 | MIL-DTL-25988/4 | FVMQ | Active |
| MS29513-244 | MIL-P-5315 (MS29513 part drawing) | NBR | Canceled (MIL-P-5315); AS29513C current |
| AS3582-244 | SAE AS3582 (AMS3304) | VMQ silicone | AS3582 current |
| AS9386-244 | SAE AS9386 (AMS7267) | VMQ silicone | AS9386B current |
The base polymer
AS3209-244 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.
Nearby AS3209 part numbers
| Part number | ID in | ID mm | W in | W mm |
|---|---|---|---|---|
| AS3209-237 | 3.359 | 85.32 | 0.139 | 3.53 |
| AS3209-239 | 3.609 | 91.67 | 0.139 | 3.53 |
| AS3209-243 | 4.109 | 104.37 | 0.139 | 3.53 |
| AS3209-244 | 4.234 | 107.54 | 0.139 | 3.53 |
| AS3209-247 | 4.609 | 117.07 | 0.139 | 3.53 |
| AS3209-257 | 5.859 | 148.82 | 0.139 | 3.53 |
| AS3209-359 | 5.725 | 145.42 | 0.210 | 5.33 |
Frequently asked
What is the AS568 equivalent of AS3209-244?
AS3209-244 is the AS568-244 size: 4.234 in (107.54 mm) inside diameter by 0.139 in (3.53 mm) cross-section. The dash sets the size; SAE AS3209 (AMS7276) sets the fluorocarbon (FKM) compound. An AS568-244 ring in any other compound has the same dimensions but is not the same part as AS3209-244.
What is the NSN for AS3209-244?
DLA's public FLIS data lists AS3209-244 on NSN 5331-00-165-1962 (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-AS3209 still active?
The document status reads: AS3209C stabilized (2021). It comes from the SAE Mobilus record listed under Sources, with the date it was read.
How do I order AS3209-244?
Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. AS3209-244 is quoted and supplied against SAE AS3209 (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 and tolerance note from the MS28775 Revision E sheet (1984-03-23, read 2026-10-04), MS29513 Revision C sheet (1966-09-16, read 2026-09-27) and MS9386 Revision B sheet (1975-01-17, read 2026-09-27), DLA ASSIST; the other part numbers' statuses from DLA ASSIST document details, idents 18115 (MIL-PRF-25732), 33814 (MIL-P-83461/1), 33574 (MIL-R-83248/1), 33575 (MIL-R-83248/2), 33840 (MIL-R-83485/1), 18214 (MIL-DTL-25988/1), 18215 (MIL-DTL-25988/2), 18216 (MIL-DTL-25988/3), 18217 (MIL-DTL-25988/4) and 5334 (MIL-P-5315), read 2026-09-24; SAE Mobilus current-revision records AS83248/2A, read 2026-09-28; AS83461/1C, AS3209C, AS83248/1A, AS3581A, AS29513C, AS3582 and AS9386B, read 2026-09-27; AS28775A, read 2026-09-25; the MIL-R-83248/1A cancellation notice (Notice 5, 2008-07-24), DLA ASSIST, read 2026-09-29; the SAE-AS83248/2 adoption record, DLA ASSIST ident 286631, read 2026-09-28; 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); the back-up ring pairing and cut styles from the same handbook, section 6, pages 6-8 and 6-9 (read 2026-09-25); SAE AS8791 and the drawings' status from the MS28774M and MS27595E drawings, DLA ASSIST (read 2026-09-28); 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 AS3209-244 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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