Mil-spec part number, M83248/1 and M83248/2 family
M83248/1-131 O-ring: fluorocarbon (FKM), the AS568-131 size
M83248/1-131 is the AS568-131 O-ring size, 1.674 in (42.52 mm) inside diameter by 0.103 in (2.62 mm) cross-section, in fluorocarbon (FKM) procured to MIL-R-83248/1 (Class 1) (the DLA ASSIST title names Class 1). The DLA ASSIST and SAE Mobilus records read: Canceled (MIL-R-83248/1); AS3209C stabilized (2021); AS83248/1A current (revised 2016, reaffirmed 2021). The dash sets the size and the document sets the compound, so an AS568-131 in another compound is not the same part as M83248/1-131. Send the designator exactly as the print reads and we quote it against that document.
- Inside diameter
- 1.674 in42.52 mm, +/- 0.015 in
- Cross-section
- 0.103 in2.62 mm, +/- 0.003 in
- AS568 size
- AS568-1311xx series
- Document status
- CanceledMIL-R-83248/1
Part facts
| Item | Value |
|---|---|
| Part number | M83248/1-131 |
| NSN | 5331-00-167-5119 (DLA FLIS, read 2026-10-08) |
| Stock | In stock in Orange, CA |
| Procured to | MIL-R-83248/1 (Class 1) (Class 1 in the DLA ASSIST title) |
| SAE document | SAE AS3209, to which DoD's 2008 cancellation notice pointed future purchases (the boss sizes, M83248/1-901 to -932, to SAE AS3208); its material specification is SAE AMS7276. SAE later issued SAE AS83248/1, O-ring molded from AMS7276 material, in December 2014 (AS83248/1A current, reaffirmed November 2021), and DoD adopted it on 2025-11-03 |
| Status | Canceled (MIL-R-83248/1); AS3209C stabilized (2021); AS83248/1A current (revised 2016, reaffirmed 2021) |
| Base polymer | Fluorocarbon (FKM) |
| AS568 size | AS568-131 |
| CAD for the AS568-131 size | AS568-131 STEP 3D solid, AS568-131 DXF 2D drawing, AS568-131 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing |
| Back-up rings | MS28774-131 (single-turn scarf-cut PTFE) or MS27595-131 (continuous PTFE), both procured to SAE AS8791; both drawings are inactive for new design |
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 1.674 in 42.52 mm | +/- 0.015 in (0.38 mm) |
| Cross-section (W) | 0.103 in 2.62 mm | +/- 0.003 in (0.08 mm) |
| Outside diameter (reference) | 1.880 in 47.76 mm | derived: ID + 2 x W |
Millimeter values are converted from the inch table. DoD cancelled MIL-R-83248/1, the slash sheet behind the M83248/1 part numbers, on 2008-07-24 and pointed future purchases to SAE AS3209, with the boss sizes (M83248/1-901 to -932) to SAE AS3208; SAE later issued AS83248/1, O-ring molded from AMS7276 material, in December 2014, and DoD adopted it on 2025-11-03 (DLA ASSIST: MIL-R-83248/1A Notice 5, read 2026-09-29, and ident 286630, read 2026-09-25; SAE Mobilus AS83248/1A, read 2026-09-27).
Same nominal size, other documents
Other part numbers for the AS568-131 size
These part numbers name the AS568-131 nominal size under a different document, so each one is a different compound. They are not interchangeable with M83248/1-131 unless the print or the buyer's engineering allows it. At this size the family sheets for MS28775-131, MS29513-131 and AS9386-131 hold a tighter inside-diameter tolerance than AS568.
| Part number | Document | Polymer | Status |
|---|---|---|---|
| MS28775-131 | MIL-PRF-25732 (MS28775 part drawing) | NBR | Inactive (MIL-PRF-25732); AS28775A current |
| M83461/1-131 | MIL-P-83461/1 | NBR | Canceled; AS83461/1C current |
| M83248/2-131 | MIL-R-83248/2 (Class 2) | FKM | Canceled; AS3581A stabilized; AS83248/2A current |
| AS3209-131 | SAE AS3209 (AMS7276) | FKM | AS3209C stabilized |
| M83485/1-131 | MIL-R-83485 | FKM, low-temperature grade | Canceled |
| M25988/1-131 | MIL-DTL-25988/1 | FVMQ | Active |
| M25988/2-131 | MIL-DTL-25988/2 | FVMQ | Active |
| M25988/3-131 | MIL-DTL-25988/3 | FVMQ | Active |
| M25988/4-131 | MIL-DTL-25988/4 | FVMQ | Active |
| MS29513-131 | MIL-P-5315 (MS29513 part drawing) | NBR | Canceled (MIL-P-5315); AS29513C current |
| AS3582-131 | SAE AS3582 (AMS3304) | VMQ silicone | AS3582 current |
| AS9386-131 | SAE AS9386 (AMS7267) | VMQ silicone | AS9386B current |
The base polymer
M83248/1-131 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 M83248/1 part numbers
| Part number | ID in | ID mm | W in | W mm |
|---|---|---|---|---|
| M83248/1-126 | 1.362 | 34.59 | 0.103 | 2.62 |
| M83248/1-127 | 1.424 | 36.17 | 0.103 | 2.62 |
| M83248/1-129 | 1.549 | 39.34 | 0.103 | 2.62 |
| M83248/1-131 | 1.674 | 42.52 | 0.103 | 2.62 |
| M83248/1-132 | 1.737 | 44.12 | 0.103 | 2.62 |
| M83248/1-133 | 1.799 | 45.69 | 0.103 | 2.62 |
| M83248/1-134 | 1.862 | 47.29 | 0.103 | 2.62 |
Frequently asked
What is the AS568 equivalent of M83248/1-131?
M83248/1-131 is the AS568-131 size: 1.674 in (42.52 mm) inside diameter by 0.103 in (2.62 mm) cross-section. The dash sets the size; MIL-R-83248/1 (Class 1) sets the fluorocarbon (FKM) compound. An AS568-131 ring in any other compound has the same dimensions but is not the same part as M83248/1-131.
What is the NSN for M83248/1-131?
DLA's public FLIS data lists M83248/1-131 on NSN 5331-00-167-5119 (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-83248/1 still active?
The document status reads: Canceled (MIL-R-83248/1); AS3209C stabilized (2021); AS83248/1A current (revised 2016, reaffirmed 2021). It comes from the DLA ASSIST and SAE Mobilus records listed under Sources, with the date each was read. DoD cancelled MIL-R-83248/1 on 2008-07-24 with Notice 5, which pointed future purchases of the M83248/1 O-rings to SAE AS3209 and of the boss sizes, M83248/1-901 to -932, to SAE AS3208, and cautions users to evaluate a replacement for their own application; AS3209's current revision, AS3209C, was stabilized in August 2021. SAE later issued AS83248/1, O-ring molded from AMS7276 material, in December 2014; its current revision, AS83248/1A (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 M83248/1-131?
Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. M83248/1-131 is quoted and supplied against MIL-R-83248/1 (Class 1), or, where the print allows it, SAE AS3209 or SAE AS83248/1, both on SAE AMS7276 material, 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; 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), 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, AS3581A, AS3209C, AS29513C, AS3582 and AS9386B, read 2026-09-27; AS28775A, read 2026-09-25; 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.
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