Mil-spec part number, MS28775 family

MS28775-007 O-ring: nitrile (NBR), AS568-007 nominal size

MS28775-007 has the AS568-007 nominal size, 0.145 in (3.68 mm) inside diameter by 0.070 in (1.78 mm) cross-section, in nitrile (NBR) procured to MIL-PRF-25732 (MS28775 part drawing). The DLA ASSIST and SAE Mobilus records read: Inactive (MIL-PRF-25732); AS28775A current (revised 2008, reaffirmed 2025). The same part is also printed as AS28775-007. At this size its DoD sheet, MS28775, gives the same inside-diameter tolerance as AS568, but the document sets the compound, so an AS568-007 ring in another compound is not the same part as MS28775-007. Send the designator exactly as the print reads and we quote it against that document.

Inside diameter: 0.145 in3.68 mm, +/- 0.005 in per the MS28775 sheet
Cross-section: 0.070 in1.78 mm, +/- 0.003 in
AS568 nominal size: AS568-0070xx series
Document status: InactiveMIL-P-25732 / MIL-PRF-25732

Request a quote for MS28775-007 MS28775 family AS568-007 size page

Dimensioned from the AS568 nominal values for AS568-007, the nominal size MS28775-007 names. Not to scale.

Part facts

MS28775-007: document, status, polymer and size
Item	Value
Part number	MS28775-007; also printed as AS28775-007
NSN	5331-00-292-0577 (DLA FLIS, read 2026-10-08)
Stock	In stock in Orange, CA
Procured to	MIL-PRF-25732 (MS28775 part drawing)
Size sheet	MS28775 Revision E (1984-03-23), the DoD drawing; canceled on 2000-09-29 and superseded by SAE-AS28775 with the same part numbers
SAE document	SAE AS28775
Status	Inactive (MIL-PRF-25732); AS28775A current (revised 2008, reaffirmed 2025)
Base polymer	Nitrile (NBR)
AS568 nominal size	AS568-007
CAD for the AS568-007 nominal size	AS568-007 STEP 3D solid, AS568-007 DXF 2D drawing, AS568-007 PDF dimensioned drawing; generated from the AS568 nominal dimensions, so verify against your drawing
Back-up rings	MS28774-007 (single-turn scarf-cut PTFE) or MS27595-007 (continuous PTFE), both procured to SAE AS8791; both drawings are inactive for new design

MS28775-007: AS568 nominal dimensions; tolerances per the MS28775 sheet
Dimension	Value	Tolerance
Inside diameter (ID)	0.145 in 3.68 mm	+/- 0.005 in (0.13 mm), the same on the MS28775 sheet
Cross-section (W)	0.070 in 1.78 mm	+/- 0.003 in (0.08 mm)
Outside diameter (reference)	0.285 in 7.24 mm	derived: ID + 2 x W

Millimeter values are converted from the inch table. At this size the MS28775 sheet's inside-diameter tolerance equals AS568's; the drawing governs.

Same nominal size, other documents

Other part numbers for the AS568-007 size

These part numbers name the AS568-007 nominal size under a different document, so each one is a different compound. They are not interchangeable with MS28775-007 unless the print or the buyer's engineering allows it.

Part standards that call out the AS568-007 nominal size
Part number	Document	Polymer	Status
M83461/1-007	MIL-P-83461/1	NBR	Canceled; AS83461/1C current
M83248/1-007	MIL-R-83248/1 (Class 1)	FKM	Canceled; AS3209C stabilized; AS83248/1A current
M83248/2-007	MIL-R-83248/2 (Class 2)	FKM	Canceled; AS3581A stabilized; AS83248/2A current
AS3209-007	SAE AS3209 (AMS7276)	FKM	AS3209C stabilized
M83485/1-007	MIL-R-83485	FKM, low-temperature grade	Canceled
M25988/1-007	MIL-DTL-25988/1	FVMQ	Active
M25988/2-007	MIL-DTL-25988/2	FVMQ	Active
M25988/3-007	MIL-DTL-25988/3	FVMQ	Active
M25988/4-007	MIL-DTL-25988/4	FVMQ	Active
MS29513-007	MIL-P-5315 (MS29513 part drawing)	NBR	Canceled (MIL-P-5315); AS29513C current
AS3582-007	SAE AS3582 (AMS3304)	VMQ silicone	AS3582 current
AS9386-007	SAE AS9386 (AMS7267)	VMQ silicone	AS9386B current

The base polymer

MS28775-007 is nitrile (NBR). For the MIL-PRF-25732 family the MIL title and the SAE title print different upper limits, so this page quotes no temperature figure; the governing document and the compound sheet for the qualified grade decide it.

Material page: Nitrile (NBR) O-rings. Every document in the family: MS28775 O-rings.

Nearby MS28775 part numbers

Part number	ID in	ID mm	W in	W mm
MS28775-005	0.101	2.57	0.070	1.78
MS28775-007	0.145	3.68	0.070	1.78
MS28775-008	0.176	4.47	0.070	1.78
MS28775-009	0.208	5.28	0.070	1.78
MS28775-010	0.239	6.07	0.070	1.78

Frequently asked

What is the AS568 nominal size of MS28775-007?

MS28775-007 has the AS568-007 nominal size: 0.145 in (3.68 mm) inside diameter by 0.070 in (1.78 mm) cross-section. At this size the MS28775 sheet gives the same inside-diameter tolerance as AS568, +/- 0.005 in, and MIL-PRF-25732 (MS28775 part drawing) sets the nitrile (NBR) compound. An AS568-007 ring in any other compound is not the same part as MS28775-007.

What is the NSN for MS28775-007?

DLA's public FLIS data lists MS28775-007 on NSN 5331-00-292-0577 (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-25732 / MIL-PRF-25732 still active?

The DLA ASSIST and SAE Mobilus records read: Inactive (MIL-PRF-25732); AS28775A current (revised 2008, reaffirmed 2025). The first status is the material document's: MIL-PRF-25732 is inactive for new design (MIL-P-25732C Notice 1, 1989-11-15). The second is SAE-AS28775's, the SAE part standard that superseded the MS28775 drawing when DoD canceled the drawing on 2000-09-29; 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 MS28775-007?

Send the designator exactly as the print reads, with its revision, any suffix letter, the quantity and the paperwork the order needs. MS28775-007 is quoted and supplied against MIL-PRF-25732 (MS28775 part drawing) or SAE AS28775, 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 18115 (MIL-PRF-25732), read 2026-09-24; DLA ASSIST: MIL-P-25732C Notice 1 (1989-11-15, inactive for new design), the MS28775 record with MS28775E Notice 3 (cancellation, 2000-09-29) and the QPL-25732 record, read 2026-09-25; SAE Mobilus: AS28775A (revised December 2008, reaffirmed 2025-02-08), read 2026-09-25; AMSP25732A (cancelled August 2003), current-revision record read 2026-09-27; DLA ASSIST: MIL-P-83461/1 (ident 33814, read 2026-09-24), SAE-AMS-P-83461/1 (ident 213939) and SAE-AS83461/1 (ident 277052), read 2026-09-25, for the M83461/1 successor chain; SAE Mobilus: AS83461/1C (revised October 2016, reaffirmed 2021-11-08) and AMSP83461 (issued 1998-04-01), current-revision records read 2026-09-27; DLA ASSIST: the MS28775E sheet (1984-03-23, 7 sheets) with Notice 1 (1989-11-15), Notice 2 (2000-08-18) and Notice 3 (2000-09-29), ident 41724, read 2026-10-04, for the dash-to-size mapping, the tolerance note and the size notes; 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 MS28775 Revision E sheet (1984-03-23) and its cancellation notice (2000-09-29), DLA ASSIST, read 2026-10-04; the other part numbers' dash-to-size mapping from the MS29513 Revision C sheet (1966-09-16, read 2026-09-27) and MS9386 Revision B sheet (1975-01-17, read 2026-09-27), DLA ASSIST; the other part numbers' statuses from DLA ASSIST document details, idents 33814 (MIL-P-83461/1), 33574 (MIL-R-83248/1), 33575 (MIL-R-83248/2), 33840 (MIL-R-83485/1), 18214 (MIL-DTL-25988/1), 18215 (MIL-DTL-25988/2), 18216 (MIL-DTL-25988/3), 18217 (MIL-DTL-25988/4) and 5334 (MIL-P-5315), read 2026-09-24; SAE Mobilus current-revision records AS83248/2A, read 2026-09-28; AS83461/1C, AS3209C, AS83248/1A, AS3581A, AS29513C, AS3582 and AS9386B, read 2026-09-27; the MIL-R-83248/1A cancellation notice (Notice 5, 2008-07-24), DLA ASSIST, read 2026-09-29; the SAE-AS83248/2 adoption record, DLA ASSIST ident 286631, read 2026-09-28; 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); the back-up ring pairing and cut styles from the same handbook, section 6, pages 6-8 and 6-9 (read 2026-09-25); SAE AS8791 and the drawings' status from the MS28774M and MS27595E drawings, DLA ASSIST (read 2026-09-28). 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.

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Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.

Need MS28775-007 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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Last updated November 5, 2026