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31-138 ✓ Verified by PartsTable
Nathan · 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 CUTTER,MILLING,METAL SLITTING is a Nathan industrial component. Key specifications include material: RUBBER, seat_angle: 37.0 DEGREES FIRST END, body_length: 0.265 INCHES NOMINAL IN, design_type: SINGLE CENTRALLY LOCATED HOLE, thread_class: 2A FIRST END A, body_diameter: 0.312 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-065-4835, 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
31-138
NSN: 5330-00-065-4835
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
materialRUBBER
seat_angle37.0 DEGREES FIRST END
body_length0.265 INCHES NOMINAL IN
design_typeSINGLE CENTRALLY LOCATED HOLE
thread_class2A FIRST END A
body_diameter0.312 INCHES NOMINAL IN
flange_height0.100 INCHES NOMINAL IN
overall_length0.365 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL PIPE SECOND END
flange_diameter0.468 INCHES NOMINAL IN
connection_styleFLARED (TUBE) FIRST END
style_designatorROUND FLANGED
NSN5330-00-065-4835
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 31-138 MFR: Nathan ⚠ 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
•
OUTSIDE DIAMETER: 4.008 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULAR-OPPOSED
•
HOUSING BORE DIAMETER: 4.003 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC SEALING ELEMENT B
•
CASE STYLE: RECESSED
•
SEAL WIDTH: 0.375 INCHES NOMINAL IN
•
ACCOMMODATED SHAFT DIAMETER: 3.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER4.008 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR-OPPOSED
HOUSING BORE DIAMETER4.003 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC SEALING ELEMENT B
MATERIALSTEEL CASE
CASE STYLERECESSED
SEAL WIDTH0.375 INCHES NOMINAL IN
ACCOMMODATED SHAFT DIAMETER3.125 INCHES NOMINAL IN
SURFACE TREATMENTPLASTIC CASE
TEMP RATING-65.0 FAHRENHEIT AND 225.0 FAHRENHEIT DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
D31138Interchangeable
interchangeable cross-reference
interchangeable
31138Interchangeable
interchangeable cross-reference
interchangeable
5303-812Interchangeable
interchangeable cross-reference
interchangeable
B26-4Interchangeable
interchangeable cross-reference
interchangeable
55525Interchangeable
interchangeable cross-reference
interchangeable
4322 39Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31-138?
31-138 is a CUTTER,MILLING,METAL SLITTING manufactured by Nathan.
What parts can replace 31-138?
There are 16 known substitutes for 31-138: D31138, 31138, 5303-812 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31-138?
31-138 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-065-4835. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026