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278-249 — SCREW,MACHINE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

278-249: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: PAN, head_height: 0.045 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.155 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN, thread_length: 1.089 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN, screw_material: STEEL CORROSION RESISTING. This part is cataloged in the U.S.

Government catalog under NSN 5330-00-448-4454, 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
278-249
NSN: 5330-00-448-4454
NIINs: 004484454, 012778860
FSC: 5330 — Packing and Gasket Materials
CAGE: K0161 — PERKINS ENGINES COMPANY LTD - PERKINS PARTS DISTRIBUTION CENTRE UK (GBR)
SPECIFICATIONS
head_stylePAN
head_height0.045 INCHES MINIMUM AND 0.053 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.155 INCHES MINIMUM AND 0.167 INCHES MAXIMUM IN
thread_length1.089 INCHES MINIMUM AND 1.125 INCHES MAXIMUM IN
screw_materialSTEEL CORROSION RESISTING
fastener_length1.125 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleSLOT
nominal_thread_diameter0.086 INCHES IN
thread_quantity_per_inch56
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
NSN5330-00-448-4454
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 278-249 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
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 278-249?
278-249 is a SCREW,MACHINE.
What is the NSN for 278-249?
278-249 is cataloged in the U.S. Government catalog under NSN 5330-00-448-4454. This indicates validated use in U.S. government and defense supply chains.
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