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PartsTable / COMPONENT / MILB857TYPEB
MILB857TYPEB ✓ 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,HEXAGON HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.297 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 1.500 INCHES MINIMUM IN, screw_material: STEEL CORROSION RESISTING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-266-4105, 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
MILB857TYPEB
NSN: 5305-00-266-4105
FSC: 5305
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.297 INCHES NOMINAL IN
thread_class3A A
thread_length1.500 INCHES MINIMUM IN
screw_materialSTEEL CORROSION RESISTING
fastener_length3.000 INCHES NOMINAL IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.750 INCHES NOMINAL IN
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.500 INCHES IN
NSN5305-00-266-4105
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MILB857TYPEB · 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: 58000 POUNDS PER SQUARE INCH LBS
•
THREAD LENGTH: 1.500 INCHES MINIMUM IN
•
SURFACE TREATMENT: CADMIUM OVERALL
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL: STEEL OVERALL
•
HEAD HEIGHT: 0.297 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
THREAD QUANTITY PER INCH: 20
TECHNICAL CHARACTERISTICS (FLIS)
MINIMUM TENSILE STRENGTH58000 POUNDS PER SQUARE INCH LBS
THREAD LENGTH1.500 INCHES MINIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL OVERALL
HEAD HEIGHT0.297 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
THREAD QUANTITY PER INCH20
HEAD STYLEHEXAGON
WIDTH BETWEEN FLATS0.750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
MIL-S-1222HInterchangeable
interchangeable cross-reference
interchangeable
MS35311-189Interchangeable
interchangeable cross-reference
interchangeable
FF-S-85Interchangeable
interchangeable cross-reference
interchangeable
5/8-11 UNC-2A X 3.00 LGInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222JInterchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-1222TYPE1STYLEAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILB857TYPEB?
MILB857TYPEB is a SCREW,CAP,HEXAGON HEAD.
What parts can replace MILB857TYPEB?
There are 19 known substitutes for MILB857TYPEB: MIL-S-1222H, MS35311-189, FF-S-85 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILB857TYPEB?
MILB857TYPEB is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-266-4105. 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