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7976991 — SEAL,PLAIN ENCASED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

7976991: SEAL,PLAIN ENCASED.

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, housing_bore_diameter: 1.252 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN, sealing_element_style: VERTICAL, accommodated_shaft_diameter: 0.747 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-693-3375, 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
7976991
NSN: 5330-00-693-3375
FSC: 5330 — Packing and Gasket Materials
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
housing_bore_diameter1.252 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN
sealing_element_styleVERTICAL
accommodated_shaft_diameter0.747 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
NSN5330-00-693-3375
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 7976991 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
•
SEAL WIDTH: 0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
•
SEALING ELEMENT STYLE: VERTICAL
•
HOUSING BORE DIAMETER: 1.252 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN
•
CASE STYLE: SQUARE
•
ACCOMMODATED SHAFT DIAMETER: 0.747 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY CASE
TECHNICAL CHARACTERISTICS
SEAL WIDTH0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
SEALING ELEMENT STYLEVERTICAL
HOUSING BORE DIAMETER1.252 INCHES MINIMUM AND 1.256 INCHES MAXIMUM IN
CASE STYLESQUARE
ACCOMMODATED SHAFT DIAMETER0.747 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY CASE
MATERIALRUBBER SYNTHETIC SEALING ELEMENT
SUBSTITUTES & CROSS-REFERENCES 1
51X139Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 7976991?
7976991 is a SEAL,PLAIN ENCASED.
What parts can replace 7976991?
There is 1 known substitute for 7976991: 51X139. Substitute compatibility should be verified for your specific system.
What is the NSN for 7976991?
7976991 is cataloged in the U.S. Government catalog under NSN 5330-00-693-3375. 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.