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Technical Data Sheet
PartsTable / COMPONENT / 857B1
857B1 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1010 OR STEEL COMP 1020 OVERALL, hole_type: DRILLED, head_style: SQUARE, head_height: 0.250 INCHES NOMINAL IN, point_style: FLAT, thread_class: 2A A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-740-9103, 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
857B1
NSN: 5305-00-740-9103
FSC: 5305
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 1020 OVERALL
hole_typeDRILLED
head_styleSQUARE
head_height0.250 INCHES NOMINAL IN
point_styleFLAT
thread_class2A A
hole_diameter0.062 INCHES NOMINAL IN
hole_quantity2
thread_length0.625 INCHES MINIMUM IN
fastener_length0.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
NSN5305-00-740-9103
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 857B1 · 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
•
HOLE CONFIGURATION STYLE: SQUARE LONGITUDINAL HOLE
•
HOLE DIAMETER: 0.062 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL: STEEL COMP 1010 OR STEEL COMP 1020 OVERALL
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
HEAD HEIGHT: 0.250 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 16
TECHNICAL CHARACTERISTICS (FLIS)
HOLE CONFIGURATION STYLESQUARE LONGITUDINAL HOLE
HOLE DIAMETER0.062 INCHES NOMINAL IN
THREAD CLASS2A A
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL COMP 1010 OR STEEL COMP 1020 OVERALL
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
HEAD HEIGHT0.250 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16
HOLE QUANTITY2
POINT STYLEFLAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
8320Interchangeable
interchangeable cross-reference
interchangeable
AA59214-8A-3Interchangeable
interchangeable cross-reference
interchangeable
A-A-59214Interchangeable
interchangeable cross-reference
interchangeable
82N82Interchangeable
interchangeable cross-reference
interchangeable
NTCC100Interchangeable
interchangeable cross-reference
interchangeable
SM-C-454827Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 857B1?
857B1 is a SETSCREW.
What parts can replace 857B1?
There are 20 known substitutes for 857B1: 8320, AA59214-8A-3, A-A-59214 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 857B1?
857B1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-740-9103. 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