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A-143SR251-70 — PACKING,PREFORMED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A-143SR251-70: PACKING,PREFORMED.

The PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER POLYMETHYLENE-PERFLUOROALKYLENE CLASS FKM OVERALL, temp_rating: -25.0 CELSIUS AND 205.0 CELSIUS DEGC, hardness_rating: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM OVERALL, operating_medium: HYDRAULIC FLUID, peripheral_diameter: 2.605 INCHES MINIMUM AND 2.657 INCHES MAXIMUM IN, center_hole_diameter: 2.415 INCHES MINIMUM AND 2.435 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-260-7226, 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
A-143SR251-70
NSN: 5330-01-260-7226
FSC: 5330 — Packing and Gasket Materials
CAGE: 95272 — STILLMAN SEAL CORPORATION DIV STILLMAN SEAL CORPERATION (USA)
SPECIFICATIONS
materialRUBBER POLYMETHYLENE-PERFLUOROALKYLENE CLASS FKM OVERALL
temp_rating-25.0 CELSIUS AND 205.0 CELSIUS DEGC
hardness_rating70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM OVERALL
operating_mediumHYDRAULIC FLUID
peripheral_diameter2.605 INCHES MINIMUM AND 2.657 INCHES MAXIMUM IN
center_hole_diameter2.415 INCHES MINIMUM AND 2.435 INCHES MAXIMUM IN
elongation_percentage125 MAXIMUM
cross-sectional_height0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
functional_descriptionHYDRAULIC SILICATE ESTER FLUID MIL-G-5514 STATIC AND RECIPROCATING PACKING GLAND APPL
cross-sectional_shape_styleO-RING
specification/standard_data07482-J221 MANUFACTURERS STANDARD
reference_data_and_literatureSAE J120,120R1 CL 1 SZ 143 DIM. TOL
NSN5330-01-260-7226
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A-143SR251-70 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: -25.0 CELSIUS AND 205.0 CELSIUS DEGC
•
OPERATING MEDIUM: HYDRAULIC FLUID
•
CROSS-SECTIONAL HEIGHT: 0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
•
HARDNESS RATING: 70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM OVERALL
•
REFERENCE DATA AND LITERATURE: SAE J120,120R1 CL 1 SZ 143 DIM. TOL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-83248,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: O-RING
•
ELONGATION PERCENTAGE: 125 MAXIMUM
TECHNICAL CHARACTERISTICS
TEMP RATING-25.0 CELSIUS AND 205.0 CELSIUS DEGC
OPERATING MEDIUMHYDRAULIC FLUID
CROSS-SECTIONAL HEIGHT0.100 INCHES MINIMUM AND 0.106 INCHES MAXIMUM IN
HARDNESS RATING70.0 SHORE DUROMETER A MINIMUM AND 80.0 SHORE DUROMETER A MAXIMUM OVERALL
REFERENCE DATA AND LITERATURESAE J120,120R1 CL 1 SZ 143 DIM. TOL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-83248,CLASS 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLEO-RING
ELONGATION PERCENTAGE125 MAXIMUM
SPECIFICATION/STANDARD DATA07482-J221 MANUFACTURERS STANDARD
PERIPHERAL DIAMETER2.605 INCHES MINIMUM AND 2.657 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 4
143-16207Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
2-143 V747-75Reference document
Same NSN cross-reference
Reference document — Secondary reference
PRP143-16207Reference document
Same NSN cross-reference
Reference document — Secondary reference
V0747 2-143Reference document
Same NSN cross-reference
Reference document — Design control — primary 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 A-143SR251-70?
A-143SR251-70 is a PACKING,PREFORMED.
What parts can replace A-143SR251-70?
There are 4 known substitutes for A-143SR251-70: 143-16207, 2-143 V747-75, PRP143-16207 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-143SR251-70?
A-143SR251-70 is cataloged in the U.S. Government catalog under NSN 5330-01-260-7226. 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.