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Technical Data Sheet
21158-0257 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The SEAL,PLAIN ENCASED is a the manufacturer industrial component. Key specifications include color: BLACK, material: LEATHER AND RUBBER SYNTHETIC SEALING ELEMENT, case_style: SQUARE, seal_width: 0.406 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN, temp_rating: -40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF, hardness_rating: 80.0 SHORE DUROMETER A NOMINAL OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-291-6385, 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
21158-0257
NSN: 5330-00-291-6385
FSC: 5330
CAGE: 73680 — GARLOCK SEALING TECHNOLOGIES LLC DBA GARLOCK SEALING TECHNOLOGIES LLC (USA)
SPECIFICATIONS
colorBLACK
materialLEATHER AND RUBBER SYNTHETIC SEALING ELEMENT
case_styleSQUARE
seal_width0.406 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
temp_rating-40.0 FAHRENHEIT AND 200.0 FAHRENHEIT DEGF
hardness_rating80.0 SHORE DUROMETER A NOMINAL OVERALL
housing_bore_diameter1.752 INCHES NOMINAL IN
sealing_element_styleANGULAR
maximum_pressure_rating7.0 POUNDS PER SQUARE INCH (PSI) LBS
accommodated_shaft_diameter0.938 INCHES NOMINAL IN
accommodated_shaft_maximum_rated_speed3000 FEET PER MINUTE FT
NSN5330-00-291-6385
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21158-0257 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
HOUSING BORE DIAMETER: 1.752 INCHES NOMINAL IN
CASE STYLE: SQUARE
SEALING ELEMENT STYLE: ANGULAR
SEAL WIDTH: 0.406 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
MAXIMUM PRESSURE RATING: 7.0 POUNDS PER SQUARE INCH (PSI) LBS
COLOR: BLACK
MATERIAL: LEATHER AND RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 3000 FEET PER MINUTE FT
TECHNICAL CHARACTERISTICS (FLIS)
HOUSING BORE DIAMETER1.752 INCHES NOMINAL IN
CASE STYLESQUARE
SEALING ELEMENT STYLEANGULAR
SEAL WIDTH0.406 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
MAXIMUM PRESSURE RATING7.0 POUNDS PER SQUARE INCH (PSI) LBS
COLORBLACK
MATERIALLEATHER AND RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3000 FEET PER MINUTE FT
MATERIALSTEEL CASE
HARDNESS RATING80.0 SHORE DUROMETER A NOMINAL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
3208XIAInterchangeable
interchangeable cross-reference
interchangeable
903208Interchangeable
interchangeable cross-reference
interchangeable
30D86Interchangeable
interchangeable cross-reference
interchangeable
17530Interchangeable
interchangeable cross-reference
interchangeable
42-3843Interchangeable
interchangeable cross-reference
interchangeable
0039970392Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21158-0257?
21158-0257 is a SEAL,PLAIN ENCASED.
What parts can replace 21158-0257?
There are 16 known substitutes for 21158-0257: 3208XIA, 903208, 30D86 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21158-0257?
21158-0257 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-291-6385. This indicates validated use in U.S. government and defense supply chains.
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