Mil-spec part number, MS29513 and MS29512 family
MS29512-20 O-ring: nitrile (NBR), AS568-920 nominal size
MS29512-20 has the AS568-920 nominal size, 1.475 in (37.47 mm) inside diameter by 0.118 in (3.00 mm) cross-section, in nitrile (NBR) procured to MIL-P-5315 (MS29512 boss drawing). The DLA ASSIST and SAE Mobilus records read: Canceled (MIL-P-5315); AS29512C current (revised 2016, reaffirmed 2021). The -20 names the tube OD in sixteenths of an inch, a 1-1/4 in tube, and matches AS568-920. Its DoD sheet, MS29512, holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID, and the document sets the compound, so an AS568-920 ring is not the same part as MS29512-20. Send the designator exactly as the print reads and we quote it against that document.
- Inside diameter
- 1.475 in37.47 mm; tolerance per the MS29512 sheet
- Cross-section
- 0.118 in3.00 mm, +/- 0.004 in
- AS568 nominal size
- AS568-920straight-thread boss series
- Document status
- CanceledMIL-P-5315
Part facts
| Item | Value |
|---|---|
| Part number | MS29512-20 |
| NSN | 5331-00-263-8035 (DLA FLIS, read 2026-10-08) |
| Stock | In stock in Orange, CA |
| Procured to | MIL-P-5315 (MS29512 boss drawing) |
| Size sheet | MS29512 Revision C (1965-09-01), the DoD drawing; canceled on 2001-03-01 and superseded by SAE-AS29512 with the same part numbers |
| SAE document | SAE AS29512; its material specification is SAE AMS-P-5315 |
| Status | Canceled (MIL-P-5315); AS29512C current (revised 2016, reaffirmed 2021) |
| Base polymer | Nitrile (NBR) |
| AS568 nominal size | AS568-920 |
| Tube size the dash names | 1-1/4 in tube OD (the dash is the tube OD in sixteenths of an inch) |
| CAD for the AS568-920 nominal size | AS568-920 STEP 3D solid, AS568-920 DXF 2D drawing, AS568-920 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing |
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 1.475 in 37.47 mm | tighter than AS568 above 0.500 in ID; see the MS29512 sheet |
| Cross-section (W) | 0.118 in 3.00 mm | +/- 0.004 in (0.10 mm) |
| Outside diameter (reference) | 1.711 in 43.47 mm | derived: ID + 2 x W |
Millimeter values are converted from the inch table. The MS29512 sheet holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID; the drawing governs.
Same nominal size, other documents
Other part numbers for the AS568-920 size
These part numbers name the AS568-920 nominal size under a different document, so each one is a different compound. They are not interchangeable with MS29512-20 unless the print or the buyer's engineering allows it. At this size the family sheet for AS9385-20 holds a tighter inside-diameter tolerance than AS568.
| Part number | Document | Polymer | Status |
|---|---|---|---|
| M83461/2-920 | MIL-P-83461/2 | NBR | Canceled; SAE AS83461/2 adopted by DoD |
| AS3208-20 | SAE AS3208 (AMS7276) | FKM | AS3208A stabilized |
| AS9385-20 | SAE AS9385 (AMS7267) | VMQ silicone | Canceled; DoD withdrew its adoption on 2024-02-22, naming SAE-AS9386 |
The base polymer
MS29512-20 is nitrile (NBR). The Parker® O-Ring Handbook ORD 5700 range published for the NBR family (section 2.2) is -34 C to 100 C. That is the polymer family's range, not this document's requirement; the compound sheet for the qualified grade governs.
Material page: Nitrile (NBR) O-rings. Every document in the family: MS29513 and MS29512 O-rings.
Nearby MS29512 part numbers
| Part number | ID in | ID mm | W in | W mm |
|---|---|---|---|---|
| MS29512-08 | 0.644 | 16.36 | 0.087 | 2.21 |
| MS29512-10 | 0.755 | 19.18 | 0.097 | 2.46 |
| MS29512-12 | 0.924 | 23.47 | 0.116 | 2.95 |
| MS29512-20 | 1.475 | 37.47 | 0.118 | 3.00 |
| MS29512-24 | 1.720 | 43.69 | 0.118 | 3.00 |
Frequently asked
What is the AS568 nominal size of MS29512-20?
MS29512-20 has the AS568-920 nominal size: 1.475 in (37.47 mm) inside diameter by 0.118 in (3.00 mm) cross-section, for a 1-1/4 in tube. The MS29512 sheet holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID, and MIL-P-5315 (MS29512 boss drawing) sets the nitrile (NBR) compound. An AS568-920 ring shares the nominal size but not the tolerance, so it is not the same part as MS29512-20.
What is the NSN for MS29512-20?
DLA's public FLIS data lists MS29512-20 on NSN 5331-00-263-8035 (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-P-5315 still active?
The DLA ASSIST and SAE Mobilus records read: Canceled (MIL-P-5315); AS29512C current (revised 2016, reaffirmed 2021). The first status is the material document's: DLA ASSIST records MIL-P-5315 as canceled on 2002-02-28 and superseded by SAE AMS-P-5315, the material specification, now at revision AMSP5315C (revised 2022-08-05). The second is SAE-AS29512's, the SAE part standard that superseded the MS29512 drawing when DoD canceled the drawing on 2001-03-01; the cancellation notice keeps the part numbers unchanged. Both come from the DLA ASSIST and SAE Mobilus records listed under Sources, with the date each was read. 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 MS29512-20?
Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. MS29512-20 is quoted and supplied against MIL-P-5315 (MS29512 boss drawing) or SAE AS29512 (material specification: SAE AMS-P-5315), 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, ident 5334 (MIL-P-5315), read 2026-09-24; SAE Mobilus: AMSP5315C (revised 2022-08-05), AS29513C and AS29512C (revised October 2016, reaffirmed November 2021), 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 nominal 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 and the tolerance note from the MS29512 Revision C sheet (1965-09-01) and its cancellation notice (2001-03-01), DLA ASSIST, read 2026-09-27; the other part numbers' dash-to-size mapping and tolerance note from the MS9385 Revision A sheet (1975-01-17, read 2026-09-27), DLA ASSIST; the other part numbers' statuses from DLA ASSIST document details, ident 71937 (MIL-P-83461/2), read 2026-10-04; SAE Mobilus current-revision records AS3208A and AS9385A, read 2026-09-27; the SAE-AMS-P-83461/2 withdrawal (ident 213940) and SAE-AS83461/2 adoption (ident 277054) records, DLA ASSIST, read 2026-10-04; the SAE-AS9385 withdrawal of adoption notice, DLA ASSIST, read 2026-09-27; 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); 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.
Parker is a trademark of Parker Hannifin Corporation; no affiliation or endorsement is implied.
Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Need MS29512-20 with certification?
Send the part number as the print reads it, the quantity and the paperwork the order needs. A Conquest representative replies within one business day. A person answers (714) 632-9830, Pacific business hours.
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