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PartsTable / COMPONENT / 218071931A
218071931A ✓ 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, thread_class: 3A A, fastener_length: 1.250 INCHES NOMINAL IN, locking_feature: PATCH OR PELLET OR STRIP FASTENER, internal_drive_style: HEXAGON. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-476-9158, 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
218071931A
NSN: 5305-01-476-9158
FSC: 5305
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY K-500 OVERALL
head_styleFLAT CHAMFER
thread_class3A A
fastener_length1.250 INCHES NOMINAL IN
locking_featurePATCH OR PELLET OR STRIP FASTENER
internal_drive_styleHEXAGON
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch13
thread_series_designatorUNRC
material_document_and_classificationQQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5305-01-476-9158
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 218071931A · 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
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
LOCKING FEATURE: PATCH OR PELLET OR STRIP FASTENER
•
MATERIAL: NICKEL ALLOY K-500 OVERALL
•
THREAD QUANTITY PER INCH: 13
•
THREAD CLASS: 3A A
•
HEAD STYLE: FLAT CHAMFER
•
INTERNAL DRIVE STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.500 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
LOCKING FEATUREPATCH OR PELLET OR STRIP FASTENER
MATERIALNICKEL ALLOY K-500 OVERALL
THREAD QUANTITY PER INCH13
THREAD CLASS3A A
HEAD STYLEFLAT CHAMFER
INTERNAL DRIVE STYLEHEXAGON
FASTENER LENGTH1.250 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNRC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
LL57U40J6MInterchangeable
interchangeable cross-reference
interchangeable
61511800524Interchangeable
interchangeable cross-reference
interchangeable
910060-0406Interchangeable
interchangeable cross-reference
interchangeable
2585164Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-18240Interchangeable
interchangeable cross-reference
interchangeable
FFS92Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 218071931A?
218071931A is a SCREW,CAP,SOCKET HEAD.
What parts can replace 218071931A?
There are 23 known substitutes for 218071931A: LL57U40J6M, 61511800524, 910060-0406 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 218071931A?
218071931A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-01-476-9158. 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