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691-00128 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

691-00128: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include end_item_identification: PUMP,HYD,AXIA. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-167-5116, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
691-00128
NSN: 5331-00-167-5116
NIINs: 001675116, 015990002
FSC: 5331 — O-ring
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
end_item_identificationPUMP,HYD,AXIA
NSN5331-00-167-5116
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 691-00128 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
TEMP RATING: -15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.675 INCHES MINIMUM AND 1.711 INCHES MAXIMUM IN
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
ELONGATION PERCENTAGE: 125 MAXIMUM
•
CENTER HOLE DIAMETER: 1.475 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
•
MATERIAL: RUBBER FLUOROCARBON CLASS FPM
TECHNICAL CHARACTERISTICS
TEMP RATING-15.0 FAHRENHEIT AND 400.0 FAHRENHEIT DEGF
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.675 INCHES MINIMUM AND 1.711 INCHES MAXIMUM IN
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
ELONGATION PERCENTAGE125 MAXIMUM
CENTER HOLE DIAMETER1.475 INCHES MINIMUM AND 1.499 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONMULTIPLE LAUNCH ROCKET SYSTEM (MLRS)
MATERIALRUBBER FLUOROCARBON CLASS FPM
SUBSTITUTES & CROSS-REFERENCES 10
M83248-1-128ESReference document
Same NSN cross-reference
Reference document — Secondary reference
AMS7276GReference document
Same NSN cross-reference
Reference document — Secondary reference
21486-400 FN 7Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
2-128V747-75Reference document
Same NSN cross-reference
Reference document — Secondary reference
1697883 REV A PART NO 89CReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS83248/1-128Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 691-00128?
691-00128 is a O-RING.
What parts can replace 691-00128?
There are 10 known substitutes for 691-00128: M83248-1-128ES, AMS7276G, 21486-400 FN 7 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 691-00128?
691-00128 is cataloged in the U.S. Government catalog under NSN 5331-00-167-5116. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.