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PartsTable / COMPONENT / 255721 PIECE 89
255721 PIECE 89 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY K-500 OVERALL, head_style: FLAT CHAMFER, head_height: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, thread_length: 0.500 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 5305-01-432-9645, 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
255721 PIECE 89
NSN: 5305-01-432-9645
FSC: 5305
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialNICKEL ALLOY K-500 OVERALL
head_styleFLAT CHAMFER
head_height0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_length0.500 INCHES NOMINAL IN
fastener_length0.500 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_across_flats0.188 INCHES NOMINAL IN
internal_drive_styleHEXAGON
minimum_yield_strength90000 POUNDS PER SQUARE INCH LBS
nominal_thread_diameter0.250 INCHES IN
NSN5305-01-432-9645
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 255721 PIECE 89 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MINIMUM TENSILE STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
•
THREAD CLASS: 3A A
•
MINIMUM YIELD STRENGTH: 90000 POUNDS PER SQUARE INCH LBS
•
NONDEFINITIVE SPEC/STD DATA: 6 TYPE AND 500 GRADE
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: NICKEL ALLOY K-500 OVERALL
•
WIDTH ACROSS FLATS: 0.188 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
MINIMUM TENSILE STRENGTH130000 POUNDS PER SQUARE INCH LBS
THREAD CLASS3A A
MINIMUM YIELD STRENGTH90000 POUNDS PER SQUARE INCH LBS
NONDEFINITIVE SPEC/STD DATA6 TYPE AND 500 GRADE
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALNICKEL ALLOY K-500 OVERALL
WIDTH ACROSS FLATS0.188 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.250 INCHES IN
INTERNAL DRIVE STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 CL A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
255416Interchangeable
interchangeable cross-reference
interchangeable
8148650Interchangeable
interchangeable cross-reference
interchangeable
2640-634X1 1-2INInterchangeable
interchangeable cross-reference
interchangeable
255416 L1Interchangeable
interchangeable cross-reference
interchangeable
10-32UNRC-3AX1.125LG NICUALL1Interchangeable
interchangeable cross-reference
interchangeable
10-32UNRC-3AX1.125LG NICUALInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 255721 PIECE 89?
255721 PIECE 89 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 255721 PIECE 89?
There are 10 known substitutes for 255721 PIECE 89: 255416, 8148650, 2640-634X1 1-2IN and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 255721 PIECE 89?
255721 PIECE 89 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-432-9645. 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