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Technical Data Sheet
NS56 ✓ 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 PLUNGER,QUICK RELEASE is a the manufacturer industrial component. Key specifications include shape: ROUND, diameter: 0.3750 INCHES NOMINAL IN, material: PLASTIC POLYAMIDE NYLON CUSHIONING, thickness: 0.2187 INCHES NOMINAL IN, thread_length: 1.000 INCHES NOMINAL IN, overall_length: 1.187 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 5330-00-321-7451, 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
NS56
NSN: 5330-00-321-7451
FSC: 5330
CAGE: 88080 — COOPER CAMERON CORP COOPER BESSEMER RECIPROCATING PRODUCTS DIV (USA)
SPECIFICATIONS
shapeROUND
diameter0.3750 INCHES NOMINAL IN
materialPLASTIC POLYAMIDE NYLON CUSHIONING
thickness0.2187 INCHES NOMINAL IN
thread_length1.000 INCHES NOMINAL IN
overall_length1.187 INCHES NOMINAL IN
nominal_thread_size0.3125 INCHES IN
thread_quantity_per_inch18
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5330-00-321-7451
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NS56 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
NS56Interchangeable
interchangeable cross-reference
interchangeable
45002Interchangeable
interchangeable cross-reference
interchangeable
FSN43-3ITEM50Interchangeable
Same NIIN cross-reference
interchangeable
FSN9PC34Interchangeable
Same NIIN cross-reference
interchangeable
FSC9PC32Interchangeable
Same NIIN cross-reference
interchangeable
FS09-1PC32Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NS56?
NS56 is a PLUNGER,QUICK RELEASE.
What parts can replace NS56?
There are 9 known substitutes for NS56: NS56, 45002, FSN43-3ITEM50 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NS56?
NS56 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-321-7451. This indicates validated use in U.S. government and defense supply chains.
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