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PartsTable / COMPONENT / MILB857TYPE2GRADE2
MILB857TYPE2GRADE2 ✓ 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,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 1.000 INCHES MINIMUM IN, fastener_length: 1.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-174-9458, 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
MILB857TYPE2GRADE2
NSN: 5306-00-174-9458
FSC: 5306
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.226 INCHES MINIMUM AND 0.243 INCHES MAXIMUM IN
thread_class2A A
thread_length1.000 INCHES MINIMUM IN
fastener_length1.500 INCHES NOMINAL IN
hardness_rating95.0 ROCKWELL B MAXIMUM OVERALL
special_featuresCONFIGURATION-SCREW; TYPE-1; GRADE-2; CONDITION- AS FORMED OR STRESS RELIEVED
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentZINC OVERALL
width_between_flats0.544 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
NSN5306-00-174-9458
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: MILB857TYPE2GRADE2 · 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
•
GRIP LENGTH: 0.750 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 0.603 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 14
•
FASTENER LENGTH: 2.000 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-Z-325,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD CLASS: 2A A
•
HEAD HEIGHT: 0.281 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
GRIP LENGTH0.750 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.603 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH14
FASTENER LENGTH2.000 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-Z-325,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD CLASS2A A
HEAD HEIGHT0.281 INCHES NOMINAL IN
HEAD STYLEHEXAGON
HARDNESS RATING100.0 ROCKWELL B NOMINAL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
FFB571ANDTYPEB2ANDCLASSCUpgraded Successor
successor cross-reference
successor
60-8-16Upgraded Successor
successor cross-reference
successor
60-8-32Upgraded Successor
successor cross-reference
successor
FFB571ATYPEB1CLASSCUpgraded Successor
successor cross-reference
successor
60-8-36Upgraded Successor
successor cross-reference
successor
60-5-24Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILB857TYPE2GRADE2?
MILB857TYPE2GRADE2 is a BOLT,MACHINE.
What parts can replace MILB857TYPE2GRADE2?
There are 13 known substitutes for MILB857TYPE2GRADE2: FFB571ANDTYPEB2ANDCLASSC, 60-8-16, 60-8-32 and 10 more. Substitute compatibility should be verified for your specific system.
Is MILB857TYPE2GRADE2 still available?
MILB857TYPE2GRADE2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026