Mil-spec O-ring family, low-temperature fluorocarbon
M83485/1 O-rings: low-temperature fluorocarbon to AMS-R-83485 and AMS7287
M83485/1-XXX is a fluorocarbon (FKM) O-ring from a grade with improved low-temperature performance, in the AS568 size the dash names. MIL-R-83485 is cancelled; its SAE material document is AMS-R-83485, and manufacturers now cite SAE-AMS7287 (fluorocarbon 70 to 80, low-temperature sealing) for the same part. No qualified products list is on record.
- Polymer
- Fluorocarbon (FKM)low-temperature grade
- Durometer
- 75as manufacturers supply it
- Current documents
- AMS-R-83485A, AMS7287A2014, 2022
- QPL
- None on recordMIL document cancelled
Specification: documents, status, material
| Item | Value | Source |
|---|---|---|
| MIL document | MIL-R-83485 (fluorocarbon, improved performance at low temperatures, O-rings, sizes and tolerances): Canceled 2002-10-23, superseded by SAE-AMS-R-83485/1 | DLA ASSIST ident 33840, read 2026-09-06 |
| SAE material document | SAE-AMS-R-83485: current AMSR83485A, 2014-05-28 | SAE Mobilus, read 2026-09-06 |
| Successor compound document | SAE-AMS7287, fluorocarbon 70 to 80, low-temperature sealing: Revised, current AMS7287A, 2022-09-08; manufacturers now point the M83485/1 part at it | SAE Mobilus; manufacturers' cross-references |
| MIL-DTL-83485 | No such document was found on DLA ASSIST; treat the prefix as a mis-transcription of MIL-R-83485 | DLA ASSIST and SAE Mobilus, read 2026-09-06 |
| Base polymer | Fluorocarbon (FKM), low-temperature grade; not a fluorosilicone | document titles |
| Durometer | Manufacturers supply this family at 75 (Parker® ORD 5700 (2021) Table 8-4 lists its compound in the 70 to 80 band); confirm the durometer against your print | Parker ORD 5700 (2021) |
| Low-temperature requirement | The AMS7287 title states a glass-transition requirement; we cite the document and quote no figure | SAE Mobilus title |
| Slash sheets / classes | /1; no other sheet is on record | DLA ASSIST and SAE Mobilus, read 2026-09-06 |
| Boss variant | None on record | DLA ASSIST and SAE Mobilus, read 2026-09-06 |
| QPL | None on record for the cancelled MIL document; AMS-R-83485 and AMS7287 not stated | DLA ASSIST and SAE Mobilus, read 2026-09-06 |
| Service | Fluorocarbon service with improved low-temperature performance (the document title) | document title |
| Compounds manufacturers pair with this document | Parker ORD 5700 (2021) Table 8-4 pairs VM835-75 with AMS-R-83485 in the 70 to 80 band; Table 8-3 lists the same compound against MIL-R-83485 | 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
M83485/1-XXX is the AS568-XXX size, per the manufacturers' cross-references. No boss variant is on record. The dash never changes the material.
| M83485/1 | AS568 dash | ID in | W in | ID mm | W mm |
|---|---|---|---|---|---|
| M83485/1-006 | AS568-006 | 0.114 | 0.070 | 2.90 | 1.78 |
| M83485/1-010 | AS568-010 | 0.239 | 0.070 | 6.07 | 1.78 |
| M83485/1-012 | AS568-012 | 0.364 | 0.070 | 9.25 | 1.78 |
| M83485/1-112 | AS568-112 | 0.487 | 0.103 | 12.37 | 2.62 |
| M83485/1-114 | AS568-114 | 0.612 | 0.103 | 15.54 | 2.62 |
| M83485/1-116 | AS568-116 | 0.737 | 0.103 | 18.72 | 2.62 |
| M83485/1-210 | AS568-210 | 0.734 | 0.139 | 18.64 | 3.53 |
| M83485/1-214 | AS568-214 | 0.984 | 0.139 | 24.99 | 3.53 |
| M83485/1-222 | AS568-222 | 1.484 | 0.139 | 37.69 | 3.53 |
| M83485/1-325 | 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-83485 covered fluorocarbon O-rings with improved performance at low temperature, a separate line from the general-purpose MIL-R-83248. DLA ASSIST records it cancelled on 2002-10-23 and names SAE-AMS-R-83485/1 as its successor; SAE's material document AMS-R-83485 is current at revision A of 2014-05-28. SAE later published AMS7287, a fluorocarbon 70 to 80 document for low-temperature sealing, current at revision A of 2022-09-08, and manufacturers' cross-references now cite AMS7287 for the M83485/1 part with AMS-R-83485 and MIL-R-83485 as the previous documents.
Two things to keep straight: 83485 is a fluorocarbon, not a fluorosilicone (the fluorosilicone family is 25988), and MIL-DTL-83485 does not exist on DLA ASSIST. A print that reads M83485/1 is quoted against AMS-R-83485 with AMS7287 as the compound the manufacturers now produce to.
The base polymer
The polymer behind this family is fluorocarbon (FKM), low-temperature grade. 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), low-temperature grade O-rings. Temperature ranges by family: O-ring temperature ranges.
How we quote this family
Send the designator as printed, M83485/1-XXX, with the dash, the quantity and the certification the order needs. We quote it supplied against AMS-R-83485, in the low-temperature fluorocarbon compound the document calls for (manufacturers now produce it to AMS7287), with a certificate of conformance and lot traceability. Tell us if your print or approved source list requires the AMS7287 callout specifically.
Related pages
Other families: MS28775, M83461/1, M83248/1 and M83248/2, M25988/1, /2, /3 and /4, MS29513 and MS29512, NAS1611 and NAS1612, AS3582, AS9386 and AS9385, AS3209 and AS3208.
Frequently asked
Is M83485/1 a fluorosilicone O-ring?
No. MIL-R-83485 is a fluorocarbon (FKM) document with improved performance at low temperature; the fluorosilicone family is MIL-DTL-25988 and the M25988 slash sheets. Both are oil and fuel service polymers, but they are different materials with different compound documents. Quote the one the print names.
What replaced MIL-R-83485?
DLA ASSIST records MIL-R-83485 cancelled on 2002-10-23 and superseded by SAE-AMS-R-83485/1; the SAE material document AMS-R-83485 is current at revision A of 2014. Manufacturers now cite SAE-AMS7287A (2022) for the same part, with AMS-R-83485 and MIL-R-83485 noted as the previous documents. The M83485/1 callout stays valid on drawings.
What durometer is an M83485/1 O-ring?
Manufacturers supply it at 75; Parker ORD 5700 (2021) lists its VM835-75 against AMS-R-83485 in the 70 to 80 band, and AMS7287's title also reads 70 to 80. Confirm the durometer against your print.
What is AMS7287?
An SAE fluorocarbon (FKM) compound document, 70 to 80 hardness, for low-temperature sealing, current at revision A of 2022-09-08. Its title states a glass-transition requirement, which is what distinguishes it from the general-purpose AMS7276. Manufacturers' cross-references pair the M83485/1 part with it.
Is there a QPL for M83485/1?
None on record. The cancelled MIL-R-83485 shows no qualified products list on DLA ASSIST, and the SAE pages for AMS-R-83485 and AMS7287 do not state one. Manufacturers produce to the document and certify to it; we supply the part with that certificate of conformance.
Related guides
Sources
DLA ASSIST document details, ident 33840 (MIL-R-83485), read 2026-09-06; SAE Mobilus: AMSR83485A (2014-05-28), AMS7287A (2022-09-08), read 2026-09-06; Parker O-Ring Handbook ORD 5700 (2021), Tables 8-3 and 8-4, for the compound pairing; Manufacturers' aerospace cross-references (2024) for the AMS7287 re-pointing; 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 M83485/1 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