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31139 ✓ 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

Papillon - Wizard against Super - Chick or Croco - Banana against Pirate - Fox: it’s the great battle of funny animals! But who will be the toughest? A battle game for 2 to 4 players. Key specifications include head_style: ROUND, head_height: 0.137 INCHES NOMINAL IN, thread_class: 2A A, head_diameter: 0.359 INCHES NOMINAL IN, thread_length: 1.500 INCHES NOMINAL IN, screw_material: STEEL. 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
31139
NSN: 5330-00-065-4835
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
head_styleROUND
head_height0.137 INCHES NOMINAL IN
thread_class2A A
head_diameter0.359 INCHES NOMINAL IN
thread_length1.500 INCHES NOMINAL IN
screw_materialSTEEL
fastener_length1.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentNICKEL
thread_quantity_per_inch24
NSN5330-00-065-4835
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 31139 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 31139?
31139 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK manufactured by Nathan.
What parts can replace 31139?
There are 16 known substitutes for 31139: D31138, 31138, 5303-812 and 13 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31139?
31139 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