PartsTable
Technical Data Sheet
MILB857TYPE4STYLEA0RB ✓ 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: COPPER ALLOY 462 OR COPPER ALLOY 464 OVERALL, nut_style: HEXAGON, nut_height: 0.216 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN, thread_class: 3B, 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 5310-00-189-5161, 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
MILB857TYPE4STYLEA0RB
NSN: 5310-00-189-5161
FSC: 5310
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialCOPPER ALLOY 462 OR COPPER ALLOY 464 OVERALL
nut_styleHEXAGON
nut_height0.216 INCHES MINIMUM AND 0.252 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
width_across_flats0.606 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
nominal_thread_size0.375 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch16
nondefinitive_spec/std_data4 TYPE AND A STYLE AND B STYLE
material_document_and_classificationQQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-189-5161
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILB857TYPE4STYLEA0RB · 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 SERIES: UNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE: 0.250 INCHES IN
THREAD QUANTITY PER INCH: 20
MATERIAL: STEEL COMP 410 OR STEEL COMP 416 OVERALL
SURFACE TREATMENT: PASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC ALL MATERIAL RESPONSES OVERALL
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2B
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.250 INCHES IN
THREAD QUANTITY PER INCH20
MATERIALSTEEL COMP 410 OR STEEL COMP 416 OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC ALL MATERIAL RESPONSES OVERALL
NUT STYLEHEXAGON
NUT HEIGHT0.141 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.425 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
MILB857TYPE4STYLEA0RBInterchangeable
interchangeable cross-reference
interchangeable
43N3934-10Interchangeable
interchangeable cross-reference
interchangeable
445-4510939M16Interchangeable
interchangeable cross-reference
interchangeable
SL7940-1-5Interchangeable
interchangeable cross-reference
interchangeable
81223S41-991ALT1PC12Interchangeable
interchangeable cross-reference
interchangeable
81223S41-984PC12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILB857TYPE4STYLEA0RB?
MILB857TYPE4STYLEA0RB is a NUT,PLAIN,HEXAGON.
What parts can replace MILB857TYPE4STYLEA0RB?
There are 10 known substitutes for MILB857TYPE4STYLEA0RB: MILB857TYPE4STYLEA0RB, 43N3934-10, 445-4510939M16 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILB857TYPE4STYLEA0RB?
MILB857TYPE4STYLEA0RB is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-189-5161. This indicates validated use in U.S. government and defense supply chains.
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