Mil-spec part number, M83248/1 and M83248/2 family
M83248/2-137 O-ring: fluorocarbon (FKM), the AS568-137 size
M83248/2-137 is the AS568-137 O-ring size, 2.050 in (52.07 mm) inside diameter by 0.103 in (2.62 mm) cross-section, in fluorocarbon (FKM) procured to MIL-R-83248/2 (Class 2) (the DLA ASSIST title names Class 2). The DLA ASSIST and SAE Mobilus records read: Canceled (MIL-R-83248/2); AS3581A stabilized (2020); AS83248/2A current (revised 2016, reaffirmed 2021). The dash sets the size and the document sets the compound, so an AS568-137 in another compound is not the same part as M83248/2-137. Send the designator exactly as the print reads and we quote it against that document.
- Inside diameter
- 2.050 in52.07 mm, +/- 0.017 in
- Cross-section
- 0.103 in2.62 mm, +/- 0.003 in
- AS568 size
- AS568-1371xx series
- Document status
- CanceledMIL-R-83248/2
Part facts
| Item | Value |
|---|---|
| Part number | M83248/2-137 |
| NSN | 5331-01-185-1678 (DLA FLIS, read 2026-10-08) |
| Stock | In stock in Orange, CA |
| Procured to | MIL-R-83248/2 (Class 2) (Class 2 in the DLA ASSIST title) |
| SAE document | SAE AS3581; its material specification is SAE AMS7259; also SAE AS83248/2, O-ring molded from AMS7259 material (AS83248/2A current, reaffirmed November 2021), adopted by DoD on 2025-11-03 |
| Status | Canceled (MIL-R-83248/2); AS3581A stabilized (2020); AS83248/2A current (revised 2016, reaffirmed 2021) |
| Base polymer | Fluorocarbon (FKM) |
| AS568 size | AS568-137 |
| CAD for the AS568-137 size | AS568-137 STEP 3D solid, AS568-137 DXF 2D drawing, AS568-137 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing |
| Back-up rings | MS28774-137 (single-turn scarf-cut PTFE) or MS27595-137 (continuous PTFE), both procured to SAE AS8791; both drawings are inactive for new design |
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 2.050 in 52.07 mm | +/- 0.017 in (0.43 mm) |
| Cross-section (W) | 0.103 in 2.62 mm | +/- 0.003 in (0.08 mm) |
| Outside diameter (reference) | 2.256 in 57.31 mm | derived: ID + 2 x W |
Millimeter values are converted from the inch table. The records name two SAE documents for MIL-R-83248/2: DLA ASSIST records it as canceled on 2004-01-22 and superseded by SAE-AS3581 and SAE-AMS7259, and AS3581's current revision, AS3581A, was stabilized in May 2020; SAE also issued AS83248/2, O-ring molded from AMS7259 material, in December 2014, and its current revision, AS83248/2A (revised October 2016, reaffirmed November 2021), was adopted by DoD on 2025-11-03 (DLA ASSIST idents 33575 and 286631, SAE Mobilus AS3581A and AS83248/2A, all read 2026-09-28).
Same nominal size, other documents
Other part numbers for the AS568-137 size
These part numbers name the AS568-137 nominal size under a different document, so each one is a different compound. They are not interchangeable with M83248/2-137 unless the print or the buyer's engineering allows it. At this size the family sheets for MS28775-137, MS29513-137 and AS9386-137 hold a tighter inside-diameter tolerance than AS568.
| Part number | Document | Polymer | Status |
|---|---|---|---|
| MS28775-137 | MIL-PRF-25732 (MS28775 part drawing) | NBR | Inactive (MIL-PRF-25732); AS28775A current |
| M83461/1-137 | MIL-P-83461/1 | NBR | Canceled; AS83461/1C current |
| M83248/1-137 | MIL-R-83248/1 (Class 1) | FKM | Canceled; AS3209C stabilized; AS83248/1A current |
| AS3209-137 | SAE AS3209 (AMS7276) | FKM | AS3209C stabilized |
| M83485/1-137 | MIL-R-83485 | FKM, low-temperature grade | Canceled |
| M25988/1-137 | MIL-DTL-25988/1 | FVMQ | Active |
| M25988/2-137 | MIL-DTL-25988/2 | FVMQ | Active |
| M25988/3-137 | MIL-DTL-25988/3 | FVMQ | Active |
| M25988/4-137 | MIL-DTL-25988/4 | FVMQ | Active |
| MS29513-137 | MIL-P-5315 (MS29513 part drawing) | NBR | Canceled (MIL-P-5315); AS29513C current |
| AS3582-137 | SAE AS3582 (AMS3304) | VMQ silicone | AS3582 current |
| AS9386-137 | SAE AS9386 (AMS7267) | VMQ silicone | AS9386B current |
The base polymer
M83248/2-137 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: M83248/1 and M83248/2 O-rings.
Nearby M83248/2 part numbers
| Part number | ID in | ID mm | W in | W mm |
|---|---|---|---|---|
| M83248/2-118 | 0.862 | 21.89 | 0.103 | 2.62 |
| M83248/2-120 | 0.987 | 25.07 | 0.103 | 2.62 |
| M83248/2-134 | 1.862 | 47.29 | 0.103 | 2.62 |
| M83248/2-137 | 2.050 | 52.07 | 0.103 | 2.62 |
| M83248/2-150 | 2.862 | 72.69 | 0.103 | 2.62 |
| M83248/2-210 | 0.734 | 18.64 | 0.139 | 3.53 |
| M83248/2-212 | 0.859 | 21.82 | 0.139 | 3.53 |
Frequently asked
What is the AS568 equivalent of M83248/2-137?
M83248/2-137 is the AS568-137 size: 2.050 in (52.07 mm) inside diameter by 0.103 in (2.62 mm) cross-section. The dash sets the size; MIL-R-83248/2 (Class 2) sets the fluorocarbon (FKM) compound. An AS568-137 ring in any other compound has the same dimensions but is not the same part as M83248/2-137.
What is the NSN for M83248/2-137?
DLA's public FLIS data lists M83248/2-137 on NSN 5331-01-185-1678 (read 2026-10-08). An NSN is the federal catalog's number for the item; your contract or print decides what is ordered.
Is MIL-R-83248/2 still active?
The document status reads: Canceled (MIL-R-83248/2); AS3581A stabilized (2020); AS83248/2A current (revised 2016, reaffirmed 2021). It comes from the DLA ASSIST and SAE Mobilus records listed under Sources, with the date each was read. The records name two SAE documents for this slash sheet: DLA ASSIST records MIL-R-83248/2 as canceled on 2004-01-22 and superseded by SAE-AS3581 and SAE-AMS7259, and AS3581's current revision, AS3581A, was stabilized in May 2020. SAE also issued AS83248/2, O-ring molded from AMS7259 material, in December 2014; its current revision, AS83248/2A (revised October 2016, reaffirmed November 2021), was adopted by DoD on 2025-11-03 and is Active in DLA ASSIST. A canceled or inactive MIL document can still be the one a print calls out, and your print decides which you order to.
How do I order M83248/2-137?
Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. M83248/2-137 is quoted and supplied against MIL-R-83248/2 (Class 2), SAE AS3581 (material specification: SAE AMS7259) or SAE AS83248/2, 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 33574 and 33575 (MIL-R-83248 slash sheets), 105727 (AMS7276) and 105726 (AMS7259), read 2026-09-24; idents 33573 (MIL-R-83248), 18175 (MIL-R-25897), 286630 (SAE-AS83248/1) and 286631 (SAE-AS83248/2), read 2026-09-25; the MIL-R-83248/1A cancellation notice (Notice 5, 2008-07-24), read 2026-09-29; SAE Mobilus: AMSR83248A (2005-09-22), read 2026-09-24; AMS7276J (2020-05-18), read 2026-09-25; AS83248/1A (revised October 2016, reaffirmed 2021-11-08), AS3209C (stabilized 2021-08-03), AS3581A (stabilized 2020-05-12) and AS3208A (stabilized 2020-05-12), 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; DLA ASSIST: MIL-R-83248/2 (ident 33575; canceled 2004-01-22, superseded by SAE-AS3581 and SAE-AMS7259) and SAE-AS83248/2 (ident 286631; Active, adopted 2025-11-03), read 2026-09-28; SAE Mobilus: AS83248/2A (reaffirmed November 2021) and AS3581A (stabilized May 2020), read 2026-09-28; 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), 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 AS83461/1C, AS3209C, AS83248/1A, 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 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.
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