Mil-spec O-ring family, fluorocarbon, 75 and 90 hardness
M83248 O-rings: fluorocarbon 75 (/1) and 90 (/2) to AMS7276 and AMS7259
M83248/1-XXX is a fluorocarbon (FKM) O-ring at Class 1, 75 hardness, and M83248/2-XXX is the same polymer at Class 2, 90 hardness, each in the AS568 size the dash names. MIL-R-83248 is cancelled, and the compounds are now SAE-AMS7276 (70 to 80) and SAE-AMS7259 (85 to 95). DoD cancelled the /1 sheet in 2008 and pointed future purchases to SAE AS3209 (boss sizes to AS3208); SAE later issued AS83248/1 (2014), which DoD adopted on 2025-11-03. The /2 sheet's record names SAE-AS3581, and SAE also issued AS83248/2 (2014), which DoD adopted the same day. Both AMS documents are Active and carry SAE non-government qualified products lists.
- Polymer
- Fluorocarbon (FKM)fuel and engine oil systems
- Durometer
- 75 (/1), 90 (/2)Class 1, Class 2 in the titles
- SAE drawings
- /1: AS3209, AS83248/1; /2: AS3581, AS83248/2records name both
- QPL
- SAE non-governmenton AMS7276 and AMS7259
Specification: documents, status, material
| Item | Value | Source |
|---|---|---|
| MIL material document | MIL-R-83248: Canceled 2001-06-21, superseded by SAE-AMS7276, SAE-AMS7259, SAE-AMS3216 and SAE-AMS3218 | DLA ASSIST ident 33573, read 2026-09-25 |
| MIL slash sheet /1 | MIL-R-83248/1 (O-Rings, Class 1, 75 Hardness): Canceled 2008-07-24 by Notice 5, which refers future purchases of M83248/1-001 to -475 to SAE-AS3209 and of the boss sizes, M83248/1-901 to -932, to SAE-AS3208, and cautions users to evaluate replacements for their application | DLA ASSIST ident 33574, read 2026-09-24; MIL-R-83248/1A Notice 5, DLA ASSIST, read 2026-09-29 |
| MIL slash sheet /2 | MIL-R-83248/2 (O-Rings, Class 2, 90 Hardness): Canceled, superseded by SAE-AS3581 and SAE-AMS7259 | DLA ASSIST ident 33575, read 2026-09-24 |
| SAE parallel | SAE-AMS-R-83248: Canceled, AMSR83248A, 2005-09-22 | SAE Mobilus, read 2026-09-24 |
| Class 1 compound document | SAE-AMS7276, fluorocarbon 70 to 80 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 |
| Class 2 compound document | SAE-AMS7259, fluorocarbon 85 to 95: Active, 2017-08-17 | DLA ASSIST ident 105726, read 2026-09-24 |
| SAE /1 drawings | SAE-AS3209 on AMS7276, the drawing Notice 5 names: Stabilized; current AS3209C, 2021-08-03. SAE-AS83248/1, O-ring molded from AMS7276 material, issued December 2014, after the notice: Reaffirmed; current AS83248/1A, revised October 2016, reaffirmed 2021-11-08. No record names AS83248/1 as the /1 sheet's replacement | SAE Mobilus, read 2026-09-27; MIL-R-83248/1A Notice 5, DLA ASSIST, read 2026-09-29 |
| Current /2 drawing | SAE-AS3581 on AMS7259: Stabilized; current AS3581A, stabilized 2020-05-12 | SAE Mobilus, read 2026-09-27 |
| DoD-adopted SAE drawings | SAE-AS83248/1 (O-ring molded from AMS7276 material) and SAE-AS83248/2 (from AMS7259): both ASSIST Active, adopted 2025-11-03 | DLA ASSIST idents 286630 and 286631, read 2026-09-25 |
| Base polymer | Fluorocarbon (FKM) | document titles |
| Durometer | Class 1 = 75 (AMS7276 band 70 to 80); Class 2 = 90 (AMS7259 band 85 to 95), as the document titles print them | DLA ASSIST titles |
| Boss variant | Notice 5 lists M83248/1-901 to -932 (its table II, straight-thread tube-fitting boss gaskets) and points them to SAE-AS3208, the AMS7276 boss size sheet (AS3208-YY; see the AS3209 page) | MIL-R-83248/1A Notice 5, DLA ASSIST, read 2026-09-29; SAE Mobilus, read 2026-09-27 |
| QPL | MIL-R-83248: none on record. AMS7276: Non-government QPL; AMS7259: Non-government QPL available (SAE-held lists, not in the DLA QPD) | DLA ASSIST qualification lines |
| Service | Fuel systems and specific engine oil systems (the AMS7276 title); high temperature, fluid and compression-set resistant (the MIL-R-83248 title) | document titles |
| Compounds manufacturers pair with this document | Parker® ORD 5700 (2021) Table 8-3 pairs V0747-75, V1164-75 and V1226-75 with MIL-R-83248 Type I Class 1 and V0709-90 with Class 2; Table 8-4 pairs V1164-75 with AMS7276 and V0709-90 with AMS7259 | 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
M83248/1-XXX and M83248/2-XXX are the AS568-XXX size, per Freudenberg Sealing Technologies' Aerospace Part and Material Cross-Reference (brochure, July 2024, page 3, read 2026-09-27); the slash sheet changes the hardness class, never the size. Parker's own ordering example for a specification part is M83248/1-325. The 2008 cancellation notice also lists boss part numbers, M83248/1-901 to -932, and points them to SAE AS3208, whose designator is AS3208-YY.
| M83248/1 | M83248/2 | AS568 dash | ID in | W in | ID mm | W mm |
|---|---|---|---|---|---|---|
| M83248/1-006 | M83248/2-006 | AS568-006 | 0.114 | 0.070 | 2.90 | 1.78 |
| M83248/1-010 | M83248/2-010 | AS568-010 | 0.239 | 0.070 | 6.07 | 1.78 |
| M83248/1-012 | M83248/2-012 | AS568-012 | 0.364 | 0.070 | 9.25 | 1.78 |
| M83248/1-112 | M83248/2-112 | AS568-112 | 0.487 | 0.103 | 12.37 | 2.62 |
| M83248/1-114 | M83248/2-114 | AS568-114 | 0.612 | 0.103 | 15.54 | 2.62 |
| M83248/1-116 | M83248/2-116 | AS568-116 | 0.737 | 0.103 | 18.72 | 2.62 |
| M83248/1-210 | M83248/2-210 | AS568-210 | 0.734 | 0.139 | 18.64 | 3.53 |
| M83248/1-214 | M83248/2-214 | AS568-214 | 0.984 | 0.139 | 24.99 | 3.53 |
| M83248/1-222 | M83248/2-222 | AS568-222 | 1.484 | 0.139 | 37.69 | 3.53 |
| M83248/1-325 | M83248/2-325 | 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.
M83248/1 and M83248/2 part numbers with their own page
Each of the 174 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.
M83248/1
M83248/1 part numbers, 0xx series (31)
M83248/1-006, M83248/1-008, M83248/1-009, M83248/1-010, M83248/1-011, M83248/1-012, M83248/1-013, M83248/1-014, M83248/1-015, M83248/1-016, M83248/1-017, M83248/1-018, M83248/1-019, M83248/1-020, M83248/1-021, M83248/1-022, M83248/1-023, M83248/1-024, M83248/1-025, M83248/1-026, M83248/1-027, M83248/1-028, M83248/1-029, M83248/1-030, M83248/1-031, M83248/1-032, M83248/1-034, M83248/1-038, M83248/1-040, M83248/1-042, M83248/1-044
M83248/1 part numbers, 1xx series (50)
M83248/1-106, M83248/1-110, M83248/1-111, M83248/1-112, M83248/1-113, M83248/1-114, M83248/1-115, M83248/1-116, M83248/1-117, M83248/1-118, M83248/1-119, M83248/1-120, M83248/1-121, M83248/1-122, M83248/1-123, M83248/1-124, M83248/1-125, M83248/1-126, M83248/1-127, M83248/1-129, M83248/1-131, M83248/1-132, M83248/1-133, M83248/1-134, M83248/1-135, M83248/1-136, M83248/1-137, M83248/1-138, M83248/1-139, M83248/1-140, M83248/1-141, M83248/1-142, M83248/1-143, M83248/1-145, M83248/1-147, M83248/1-148, M83248/1-150, M83248/1-151, M83248/1-152, M83248/1-153, M83248/1-154, M83248/1-155, M83248/1-157, M83248/1-158, M83248/1-160, M83248/1-162, M83248/1-163, M83248/1-164, M83248/1-171, M83248/1-175
M83248/1 part numbers, 2xx series (40)
M83248/1-211, M83248/1-212, M83248/1-213, M83248/1-214, M83248/1-215, M83248/1-216, M83248/1-217, M83248/1-218, M83248/1-219, M83248/1-222, M83248/1-223, M83248/1-224, M83248/1-225, M83248/1-228, M83248/1-229, M83248/1-230, M83248/1-231, M83248/1-232, M83248/1-233, M83248/1-234, M83248/1-235, M83248/1-236, M83248/1-237, M83248/1-238, M83248/1-239, M83248/1-240, M83248/1-241, M83248/1-242, M83248/1-243, M83248/1-244, M83248/1-247, M83248/1-248, M83248/1-249, M83248/1-254, M83248/1-256, M83248/1-257, M83248/1-259, M83248/1-265, M83248/1-266, M83248/1-275
M83248/1 part numbers, 3xx series (12)
M83248/1-322, M83248/1-325, M83248/1-326, M83248/1-327, M83248/1-330, M83248/1-333, M83248/1-342, M83248/1-345, M83248/1-352, M83248/1-353, M83248/1-358, M83248/1-359
M83248/1 part numbers, 4xx series (4)
M83248/2
M83248/2 part numbers, 0xx series (13)
M83248/2-007, M83248/2-010, M83248/2-011, M83248/2-013, M83248/2-014, M83248/2-015, M83248/2-016, M83248/2-018, M83248/2-020, M83248/2-022, M83248/2-029, M83248/2-030, M83248/2-032
M83248/2 part numbers, 1xx series (10)
M83248/2-110, M83248/2-111, M83248/2-113, M83248/2-115, M83248/2-117, M83248/2-118, M83248/2-120, M83248/2-134, M83248/2-137, M83248/2-150
M83248/2 part numbers, 2xx series (13)
M83248/2-210, M83248/2-212, M83248/2-213, M83248/2-214, M83248/2-215, M83248/2-217, M83248/2-221, M83248/2-226, M83248/2-228, M83248/2-232, M83248/2-233, M83248/2-234, M83248/2-236
M83248/2 part number, 3xx series (1)
Where the documents stand
MIL-R-83248 replaced MIL-R-25897 (cancelled 1980-09-25 with the note to use MIL-R-83248) as the high-temperature, fluid and compression-set resistant fluorocarbon document. DLA ASSIST records MIL-R-83248 cancelled on 2001-06-21 and names four SAE successors in its title: AMS7276, AMS7259, AMS3216 and AMS3218. Of those, AMS7276 (70 to 80) and AMS7259 (85 to 95) are the O-ring compound documents the two slash sheets moved to. The /1 size sheet followed on 2008-07-24: DoD cancelled it and, in the cancellation notice (Notice 5), pointed future purchases to SAE AS3209, with the boss sizes to SAE AS3208. SAE later issued AS83248/1, O-ring molded from AMS7276 material, in 2014, and DoD adopted it on 2025-11-03. The /2 sheet was cancelled in favor of SAE-AS3581 and SAE-AMS7259, and DoD adopted SAE-AS83248/2 (O-ring molded from AMS7259 material) on the same day, 2025-11-03. SAE's parallel material document, AMS-R-83248, is cancelled; its last revision is A, of 2005.
The compound documents are settled: AMS7276 for the 75 hardness part and AMS7259 for the 90, both Active with SAE non-government qualified products lists. For the drawing the records name two SAE documents per class, AS3209 and AS83248/1 for /1 and AS3581 and AS83248/2 for /2, and no record says one of the pair replaces the other. A print that still reads M83248/1 or M83248/2 is quoted against that number, and whether an SAE drawing stands in is the print owner's decision.
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, M83248/1-XXX or M83248/2-XXX, with the dash, the quantity and the certification the order needs. The /1 part is quoted in an AMS7276 compound and the /2 part in an AMS7259 compound, against the M number on the print, or against an SAE drawing where the print allows it (AS3209 or AS83248/1 for /1, AS3581 or AS83248/2 for /2); because both AMS documents carry a qualified products list, the part comes from a manufacturer on that 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, M83485/1, M25988/1, /2, /3 and /4, MS29513 and MS29512, NAS1611 and NAS1612, AS3582, AS9386 and AS9385, AS3209 and AS3208.
Frequently asked
What material and durometer is an M83248/1 O-ring?
Fluorocarbon (FKM) at Class 1, 75 hardness, as the MIL-R-83248/1 title prints it. The compound document today is SAE-AMS7276, whose hardness class is 70 to 80. For the drawing, DoD's 2008 cancellation notice pointed purchases to SAE AS3209, and SAE later issued AS83248/1 (2014), an O-ring molded from AMS7276 material. Parker ORD 5700 (2021) pairs V0747-75, V1164-75 and V1226-75 with the Class 1 line.
What is the difference between M83248/1 and M83248/2 O-rings?
Hardness class. /1 is Class 1 at 75 and /2 is Class 2 at 90, both fluorocarbon, both in the same AS568 sizes. Their documents differ too: /1 is AMS7276, with SAE AS3209 (named by the 2008 notice) or AS83248/1 as the drawing, and /2 is AMS7259 (85 to 95), with AS3581 or AS83248/2. Parker ORD 5700 (2021) pairs V0709-90 with the Class 2 line.
Which document does an M83248/1 O-ring ship against today?
The M83248/1 number on your print, in an AMS7276 compound, with the certificate naming the specification beside that number. DoD cancelled M83248/1 in 2008 and pointed future purchases to SAE AS3209 (boss sizes to AS3208); SAE later issued AS83248/1 (2014), which DoD adopted on 2025-11-03. Whether either SAE drawing stands in for the M number is the print owner's decision. AMS7276 is the fluorocarbon 70 to 80 hardness material document for seals in fuel systems and specific engine oil systems; it is Active and carries an SAE non-government qualified products list. The AMS7276 specification explainer in the guides covers the document itself: its revision, its titles and how it differs from AMS7280 and AMS7259.
Which mil-spec O-ring is fluorocarbon 75 durometer for fuel and high temperature?
M83248/1, with AMS7276 as the compound. Its SAE drawings are AS3209-XXX, the standard sizes the 2008 cancellation notice pointed purchases to (AS3208-YY for the boss sizes), and AS83248/1, which SAE issued in 2014. If the print needs 90 hardness, the family's /2 sheet and AS3581 on AMS7259 cover it.
What is AS83248/1?
An SAE drawing titled O-ring molded from AMS7276 material, issued in December 2014; SAE Mobilus shows revision A as current, revised in October 2016 and reaffirmed on 2021-11-08, and DoD adopted it on 2025-11-03. It came after DoD cancelled MIL-R-83248/1 in 2008, and that cancellation notice pointed future purchases to SAE AS3209 (boss sizes to AS3208); no record names AS83248/1 as the /1 sheet's replacement. It carries the sizes and AMS7276 carries the compound. Whether it stands in for an M83248/1 callout is the print owner's decision.
Related guides
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; Parker O-Ring Handbook ORD 5700 (2021), Tables 8-3 and 8-4, for the compound pairings; page 1-7 for the ordering example; 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.
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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 M83248/1 and M83248/2 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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