Mil-spec O-ring family, low-temperature fluorocarbon
M83485/1 O-rings: low-temperature fluorocarbon to MIL-R-83485/1
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 successors, the material document AMS-R-83485 and the sizes-and-tolerances sheet AMS-R-83485/1, were cancelled in 2014 and 2015, and Freudenberg Sealing Technologies' Aerospace Part and Material Cross-Reference (brochure, July 2024) now lists the same part against SAE-AMS7287 (fluorocarbon 70 to 80, low-temperature sealing). No qualified products list is on record.
- Polymer
- Fluorocarbon (FKM)low-temperature grade
- Durometer
- 75as manufacturers supply it
- Current document
- AMS7287Arevised 2022; AMS-R-83485 cancelled 2014
- QPL
- None on recordMIL document cancelled
Specification: documents, status, material
| Item | Value | Source |
|---|---|---|
| MIL document | MIL-R-83485 (fluorocarbon, improved performance at low temperatures) and its sheet /1 (O-rings, sizes and tolerances): both Canceled 2002-10-23, superseded by SAE-AMS-R-83485 and SAE-AMS-R-83485/1 | DLA ASSIST ident 33840 (sheet /1), read 2026-09-24; DLA ASSIST Document ID search, read 2026-09-28 |
| SAE material document | SAE-AMS-R-83485: Canceled; revised to A and cancelled in May 2014 (AMSR83485A, 2014-05-28) | SAE Mobilus, read 2026-09-27 |
| SAE size sheet | SAE-AMS-R-83485/1, O-rings, sizes and tolerances: Canceled; issued March 2001 and cancelled June 2015 (AMSR83485/1A, 2015-06-05); the record names no replacement | SAE Mobilus, read 2026-09-28 |
| Successor compound document | SAE-AMS7287, fluorocarbon 70 to 80, low-temperature sealing: Revised, current AMS7287A, 2022-09-08; one manufacturer's 2024 cross-reference lists the M83485/1 part against it | SAE Mobilus, read 2026-09-27; one manufacturer's cross-reference (2024), read 2026-09-27 |
| MIL-DTL-83485 | No such document was found on DLA ASSIST; treat the prefix as a mis-transcription of MIL-R-83485 | DLA ASSIST Document ID search, read 2026-09-28 |
| 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) Table 8-4, read 2026-09-24 |
| Low-temperature requirement | The AMS7287 title states a glass-transition requirement; we cite the document and quote no figure | SAE Mobilus title, read 2026-09-27 |
| Slash sheets / classes | /1; no other sheet is on record | DLA ASSIST Document ID search, read 2026-09-28 |
| Boss variant | None on record | DLA ASSIST Document ID search, read 2026-09-28; one manufacturer's cross-reference (2024), read 2026-09-27 |
| QPL | None on record for the cancelled MIL document; AMS-R-83485 and AMS7287 not stated | DLA ASSIST ident 33840, read 2026-09-24; SAE Mobilus, read 2026-09-27 |
| 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) Tables 8-3 and 8-4, read 2026-09-24 |
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 Freudenberg Sealing Technologies' Aerospace Part and Material Cross-Reference (brochure, July 2024). 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.
M83485/1 part numbers with their own page
Each of the 34 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.
M83485/1 part numbers, 0xx series (19)
M83485/1-004, M83485/1-005, M83485/1-007, M83485/1-009, M83485/1-010, M83485/1-011, M83485/1-013, M83485/1-014, M83485/1-015, M83485/1-016, M83485/1-018, M83485/1-021, M83485/1-025, M83485/1-026, M83485/1-030, M83485/1-032, M83485/1-036, M83485/1-048, M83485/1-049
M83485/1 part numbers, 1xx series (10)
M83485/1-111, M83485/1-112, M83485/1-121, M83485/1-123, M83485/1-124, M83485/1-125, M83485/1-127, M83485/1-135, M83485/1-140, M83485/1-157
M83485/1 part numbers, 2xx series (5)
M83485/1-214, M83485/1-229, M83485/1-230, M83485/1-236, M83485/1-243
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 and its O-ring sheet /1 cancelled on 2002-10-23, superseded by SAE-AMS-R-83485 and SAE-AMS-R-83485/1; SAE's material document AMS-R-83485 was revised to A and cancelled in May 2014, and SAE cancelled the sizes-and-tolerances sheet AMS-R-83485/1 in June 2015 without naming a replacement. SAE had issued AMS7287, a fluorocarbon 70 to 80 document for low-temperature sealing, in 2012, and revised it to A on 2022-09-08, and Freudenberg Sealing Technologies' Aerospace Part and Material Cross-Reference (brochure, July 2024) now lists 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 MIL-R-83485/1, the callout on the print. The SAE documents are not current alternatives: SAE cancelled AMS-R-83485 in May 2014 and AMS-R-83485/1 in June 2015. The cross-reference above lists AMS7287 as the compound.
The base polymer
The polymer behind this family is fluorocarbon (FKM), low-temperature grade. 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), 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 against MIL-R-83485/1, the callout on the print, in the low-temperature fluorocarbon compound MIL-R-83485 calls for (one manufacturer's 2024 cross-reference lists the part against AMS7287), with a certificate of conformance and lot traceability. SAE's AMS-R-83485 (cancelled May 2014) and AMS-R-83485/1 (cancelled June 2015) are not current alternatives. 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 and its O-ring sheet /1 cancelled on 2002-10-23, superseded by SAE-AMS-R-83485 and SAE-AMS-R-83485/1; SAE's own material document AMS-R-83485 was cancelled in 2014 at revision A, and its sheet AMS-R-83485/1 in June 2015, with no replacement named. One manufacturer's 2024 cross-reference now lists SAE-AMS7287 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. One manufacturer's 2024 cross-reference pairs 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-83485/1), read 2026-09-24; DLA ASSIST Document ID searches for MIL-R-83485 (two records, the base document and sheet /1) and MIL-DTL-83485 (no record), read 2026-09-28; SAE Mobilus: AMSR83485A (revised and cancelled May 2014) and AMS7287A (revised 2022-09-08), read 2026-09-27; SAE Mobilus: AMSR83485/1A (issued March 2001, cancelled June 2015), read 2026-09-28; Freudenberg Sealing Technologies, Aerospace Part and Material Cross-Reference (brochure, July 2024), read 2026-09-27, for the dash-to-AS568 correspondence and the AMS7287 pairing; Parker O-Ring Handbook ORD 5700 (2021), Tables 8-3 and 8-4, for the compound pairing, read 2026-09-24; 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 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. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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