PartsTable
Technical Data Sheet
MILB857TYPEACLASSC ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 1.500 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-188-7831, 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
MILB857TYPEACLASSC
NSN: 5310-00-188-7831
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height1.500 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats2.625 INCHES NOMINAL IN
nominal_thread_size1.750 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch5
nondefinitive_spec/std_data2 TYPE AND 4 STYLE
departure_from_cited_designatorAS MODIFIED BY WIDTH ACROSS FLATS AND NUT HEIGHT
NSN5310-00-188-7831
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILB857TYPEACLASSC · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
THREAD CLASS: 2B
THREAD QUANTITY PER INCH: 14
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE: 0.438 INCHES IN
BEARING SURFACE TYPE: FLAT OR CHAMFERED
MATERIAL: STEEL OVERALL
THREAD DIRECTION: RIGHT-HAND
NUT HEIGHT: 0.359 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
THREAD QUANTITY PER INCH14
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.438 INCHES IN
BEARING SURFACE TYPEFLAT OR CHAMFERED
MATERIALSTEEL OVERALL
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.359 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.728 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
MILB857TYPEACLASSCInterchangeable
interchangeable cross-reference
interchangeable
MILB857TYPE4STYLEA0RBGRADE1Interchangeable
interchangeable cross-reference
interchangeable
MILB857TYPE2STYLEA0RBGRADE1Interchangeable
interchangeable cross-reference
interchangeable
FFB571TYPEA2Interchangeable
interchangeable cross-reference
interchangeable
43N6870Interchangeable
interchangeable cross-reference
interchangeable
FF-B-575CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILB857TYPEACLASSC?
MILB857TYPEACLASSC is a NUT,PLAIN,HEXAGON.
What parts can replace MILB857TYPEACLASSC?
There are 8 known substitutes for MILB857TYPEACLASSC: MILB857TYPEACLASSC, MILB857TYPE4STYLEA0RBGRADE1, MILB857TYPE2STYLEA0RBGRADE1 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILB857TYPEACLASSC?
MILB857TYPEACLASSC is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-188-7831. This indicates validated use in U.S. government and defense supply chains.
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