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1129A978 — SEAL,NONMETALLIC SPECIAL SHAPED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1129A978: SEAL,NONMETALLIC SPECIAL SHAPED.

SEAL,NONMETALLIC SPECIAL SHAPED. Key specifications include material: RUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM OVERALL, temp_rating: -30.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF, construction: ONE-PIECE, aperture_width: 0.25 INCHES NOMINAL IN, aperture_length: 0.25 INCHES NOMINAL IN, hardness_rating: 70.0 SHORE DUROMETER A NOMINAL OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-625-6432, 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
1129A978
NSN: 5330-01-625-6432
FSC: 5330 — Packing and Gasket Materials
CAGE: 01170 — BELLOFRAM CORPORATION (USA)
SPECIFICATIONS
materialRUBBER ETHYLENE-PROPYLENE-DIENE CLASS EPDM OVERALL
temp_rating-30.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
constructionONE-PIECE
aperture_width0.25 INCHES NOMINAL IN
aperture_length0.25 INCHES NOMINAL IN
hardness_rating70.0 SHORE DUROMETER A NOMINAL OVERALL
style_designatorD SHAPE
cross-sectional_width0.75 INCHES NOMINAL IN
cross-sectional_height0.25 INCHES NOMINAL IN
end_item_identificationMK 208 MOD 0
cross-sectional_thickness0.125 INCHES NOMINAL IN
cross-sectional_shape_styleP SHAPE
NSN5330-01-625-6432
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1129A978 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: -30.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
•
CROSS-SECTIONAL THICKNESS: 0.125 INCHES NOMINAL IN
•
CROSS-SECTIONAL HEIGHT: 0.25 INCHES NOMINAL IN
•
CROSS-SECTIONAL WIDTH: 0.75 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A NOMINAL OVERALL
•
STYLE DESIGNATOR: D SHAPE
•
CROSS-SECTIONAL SHAPE STYLE: P SHAPE
•
APERTURE WIDTH: 0.25 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
TEMP RATING-30.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
CROSS-SECTIONAL THICKNESS0.125 INCHES NOMINAL IN
CROSS-SECTIONAL HEIGHT0.25 INCHES NOMINAL IN
CROSS-SECTIONAL WIDTH0.75 INCHES NOMINAL IN
HARDNESS RATING70.0 SHORE DUROMETER A NOMINAL OVERALL
STYLE DESIGNATORD SHAPE
CROSS-SECTIONAL SHAPE STYLEP SHAPE
APERTURE WIDTH0.25 INCHES NOMINAL IN
APERTURE LENGTH0.25 INCHES NOMINAL IN
COLORBLACK
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES 1
1129A4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1129A978?
1129A978 is a SEAL,NONMETALLIC SPECIAL SHAPED.
What parts can replace 1129A978?
There is 1 known substitute for 1129A978: 1129A4. Substitute compatibility should be verified for your specific system.
What is the NSN for 1129A978?
1129A978 is cataloged in the U.S. Government catalog under NSN 5330-01-625-6432. This indicates validated use in U.S. government and defense supply chains.
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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.