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Technical Data Sheet
PartsTable / COMPONENT / 37783PC31
37783PC31 ✓ 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 BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL, head_style: HEXAGON, head_height: 0.218 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.376 INCHES MINIMUM IN, fastener_length: 1.438 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 5306-00-823-5858, 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
37783PC31
NSN: 5306-00-823-5858
FSC: 5306
CAGE: 82340 — L3HARRIS TECHNOLOGIES, INC. DIV SPACE AND AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
materialNICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL
head_styleHEXAGON
head_height0.218 INCHES NOMINAL IN
thread_class2A A
thread_length0.376 INCHES MINIMUM IN
fastener_length1.438 INCHES NOMINAL IN
thread_directionRIGHT-HAND
width_between_flats0.438 INCHES NOMINAL IN
nominal_thread_diameter0.250 INCHES IN
first_diameter_from_head0.187 INCHES NOMINAL IN
minimum_tensile_strength130000 POUNDS PER SQUARE INCH LBS
thread_quantity_per_inch20
NSN5306-00-823-5858
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 37783PC31 · 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
•
WIDTH BETWEEN FLATS: 0.438 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
HEAD STYLE: HEXAGON
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
MINIMUM TENSILE STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS0.438 INCHES NOMINAL IN
MATERIALNICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
HEAD STYLEHEXAGON
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH20
NOMINAL THREAD DIAMETER0.250 INCHES IN
MINIMUM TENSILE STRENGTH130000 POUNDS PER SQUARE INCH LBS
FASTENER LENGTH1.438 INCHES NOMINAL IN
FIRST DIAMETER FROM HEAD0.187 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
A-A-2443Interchangeable
interchangeable cross-reference
interchangeable
37821Interchangeable
interchangeable cross-reference
interchangeable
5110-00-239-3270Interchangeable
interchangeable cross-reference
interchangeable
18356N PC 12BInterchangeable
interchangeable cross-reference
interchangeable
18356NInterchangeable
interchangeable cross-reference
interchangeable
3732-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 37783PC31?
37783PC31 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 37783PC31?
There are 6 known substitutes for 37783PC31: A-A-2443, 37821, 5110-00-239-3270 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 37783PC31?
37783PC31 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-823-5858. 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