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: the compounds are now SAE-AMS7276 (70 to 80) and SAE-AMS7259 (85 to 95), with SAE-AS83248/1 as the /1 drawing and SAE-AS3581 as the /2 drawing. 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
- Current drawings
- AS83248/1A, AS3581Acompounds AMS7276, AMS7259
- 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| MIL material document | MIL-R-83248: Canceled 2001-06-21, superseded by SAE-AMS7276, SAE-AMS7259, SAE-AMS3216 and SAE-AMS3218 | DLA ASSIST ident 33573, read 2026-09-06 |
| MIL slash sheet /1 | MIL-R-83248/1 (O-Rings, Class 1, 75 Hardness): Canceled 2008-07-24, superseded by SAE-AS83248/1 | DLA ASSIST ident 33574, read 2026-09-06 |
| MIL slash sheet /2 | MIL-R-83248/2 (O-Rings, Class 2, 90 Hardness): Canceled, superseded by SAE-AS3581 and SAE-AMS7259 | DLA ASSIST ident 33575, read 2026-09-06 |
| 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; SAE Mobilus |
| Class 2 compound document | SAE-AMS7259, fluorocarbon 85 to 95: Active, 2017-08-17 | DLA ASSIST ident 105726, read 2026-09-06 |
| Current /1 drawing | SAE-AS83248/1, O-ring molded from AMS7276 material: Reaffirmed, current AS83248/1A, 2021-11-08 | SAE Mobilus, read 2026-09-06 |
| Current /2 drawing | SAE-AS3581 on AMS7259: current AS3581A, 2020-05-12 | SAE Mobilus, read 2026-09-06 |
| 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 | None under the M83248 number; the AMS7276 boss size sheet is SAE-AS3208-YY (see the AS3209 page) | DLA ASSIST and SAE Mobilus, read 2026-09-06 |
| 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 the manufacturers' cross-references; the slash sheet changes the hardness class, never the size. Parker's own ordering example for a specification part is M83248/1-325. The AMS7276 boss sizes carry the separate AS3208-YY designator.
| 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.
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 and AMS3216 for the 70 to 80 class, AMS7259 and AMS3218 for the 85 to 95 class. The /1 size sheet followed on 2008-07-24, superseded by SAE-AS83248/1, whose title reads O-ring molded from AMS7276 material; the /2 sheet was cancelled in favor of SAE-AS3581 and SAE-AMS7259. SAE keeps a parallel material document, AMS-R-83248, at revision A of 2005.
The result is a pair of numbers for each class: AS83248/1 plus AMS7276 for the 75 hardness part, AS3581 plus AMS7259 for the 90. Both AMS compounds are Active and carry SAE non-government qualified products lists. A print that still reads M83248/1 or M83248/2 is quoted against those pairs.
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, M83248/1-XXX or M83248/2-XXX, with the dash, the quantity and the certification the order needs. The /1 part is quoted supplied against AS83248/1 in an AMS7276 compound and the /2 part against AS3581 in an AMS7259 compound, made by manufacturers on the SAE qualified products lists, 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, and the drawing is SAE-AS83248/1A, 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 successors differ too: /1 goes to AS83248/1 with AMS7276, /2 goes to AS3581 with AMS7259 (85 to 95). Parker ORD 5700 (2021) pairs V0709-90 with the Class 2 line.
What does AMS7276 specify for an O-ring?
A fluorocarbon (FKM) compound in the 70 to 80 hardness class, high-temperature and fluid resistant with low compression set, for seals in fuel systems and specific engine oil systems, per the document title on DLA ASSIST (the SAE Mobilus title reads very low compression set). It is Active and carries an SAE non-government qualified products list. It is the material behind AS83248/1, AS3209 and AS3208.
Which mil-spec O-ring is fluorocarbon 75 durometer for fuel and high temperature?
M83248/1, quoted today against AS83248/1 with AMS7276 as the compound. AS3209-XXX is the SAE size sheet on the same AMS7276 material for standard sizes, and AS3208-YY the boss sizes. If the print needs 90 hardness, the family's /2 sheet and AS3581 on AMS7259 cover it.
What is AS83248/1?
SAE's replacement drawing for MIL-R-83248/1, titled O-ring molded from AMS7276 material, reaffirmed at revision A on 2021-11-08. It carries the sizes; AMS7276 carries the compound. A print that reads M83248/1-214 is the same part quoted against AS83248/1 with AMS7276.
Related guides
Sources
DLA ASSIST document details, idents 33573, 33574, 33575 (MIL-R-83248 and slash sheets), 105727 (AMS7276), 105726 (AMS7259), 18175 (MIL-R-25897), read 2026-09-06; SAE Mobilus: AS83248/1A (2021-11-08), AS3581A (2020-05-12), AMSR83248A (2005-09-22), AMS7276J (2020-05-18), read 2026-09-06; Parker O-Ring Handbook ORD 5700 (2021), Tables 8-3 and 8-4, for the compound pairings; page 1-7 for the ordering example; 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.
Parker is a trademark of Parker Hannifin Corporation. No affiliation or endorsement is implied.
Viton is a trademark of The Chemours Company. No affiliation or endorsement is implied.
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.
Request a quoteLast updated