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PartsTable / COMPONENT / 1BN4C31P1
1BN4C31P1 ✓ 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: STEEL COMP 4037 OVERALL, head_height: 0.051 INCHES MINIMUM AND 0.059 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.201 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN, thread_length: 0.312 INCHES MAXIMUM IN, fastener_length: 0.312 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 5305-00-937-2568, 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
1BN4C31P1
NSN: 5305-00-937-2568
FSC: 5305
CAGE: 74445 — H-K CONNECTICUT HOLDING COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP 4037 OVERALL
head_height0.051 INCHES MINIMUM AND 0.059 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.201 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN
thread_length0.312 INCHES MAXIMUM IN
fastener_length0.312 INCHES NOMINAL IN
hardness_rating28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
locking_featurePELLET THREADS
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.063 INCHES NOMINAL IN
internal_drive_styleHEXAGON
NSN5305-00-937-2568
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1BN4C31P1 · 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: 0.112 INCHES IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL COMP 4037 OVERALL
•
LOCKING FEATURE: PELLET THREADS
•
THREAD QUANTITY PER INCH: 40
•
WIDTH ACROSS FLATS: 0.063 INCHES NOMINAL IN
•
HARDNESS RATING: 28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
INTERNAL DRIVE STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.112 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL COMP 4037 OVERALL
LOCKING FEATUREPELLET THREADS
THREAD QUANTITY PER INCH40
WIDTH ACROSS FLATS0.063 INCHES NOMINAL IN
HARDNESS RATING28.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
INTERNAL DRIVE STYLEHEXAGON
SURFACE TREATMENTCADMIUM OVERALL
HEAD HEIGHT0.051 INCHES MINIMUM AND 0.059 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
949-201PCR3S3T3Interchangeable
interchangeable cross-reference
interchangeable
312346PCR3S3T3Interchangeable
interchangeable cross-reference
interchangeable
5479Interchangeable
interchangeable cross-reference
interchangeable
LP50P791-81MFX2Interchangeable
interchangeable cross-reference
interchangeable
845-2104599PC16Interchangeable
interchangeable cross-reference
interchangeable
MS 35756-6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1BN4C31P1?
1BN4C31P1 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 1BN4C31P1?
There are 13 known substitutes for 1BN4C31P1: 949-201PCR3S3T3, 312346PCR3S3T3, 5479 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1BN4C31P1?
1BN4C31P1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-937-2568. 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