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Technical Data Sheet
PartsTable / COMPONENT / MILB857,1-8UNC-3B
MILB857,1-8UNC-3B ✓ 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 MILB857,1-8UNC-3B is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-202-3428, 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
MILB857,1-8UNC-3B
NSN: 5310-01-202-3428
FSC: 5310
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
Part NumberMILB857,1-8UNC-3B
NSN5310-01-202-3428
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: MILB857,1-8UNC-3B · 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 DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 8
•
BEARING SURFACE TYPE: CHAMFERED
•
NOMINAL THREAD SIZE: 1.000 INCHES IN
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NUT HEIGHT: 0.519 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH8
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE1.000 INCHES IN
CRITICALITY CODE JUSTIFICATIONZZZY
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NUT HEIGHT0.519 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN
WIDTH ACROSS FLATS1.450 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN
MATERIALNICKEL ALLOY OVERALL
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
MIL-S-1222GInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222G 1IN 8UNCInterchangeable
interchangeable cross-reference
interchangeable
001.000-08UNC-2BInterchangeable
interchangeable cross-reference
interchangeable
MILS1222G 1-8UNC2B TY 1 STY AInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222G QQ-S-763D COND AInterchangeable
interchangeable cross-reference
interchangeable
MIL-S-1222/QQ-S-763Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MILB857,1-8UNC-3B?
MILB857,1-8UNC-3B is a MILB857,1-8UNC-3B.
What parts can replace MILB857,1-8UNC-3B?
There are 9 known substitutes for MILB857,1-8UNC-3B: MIL-S-1222G, MIL-S-1222G 1IN 8UNC, 001.000-08UNC-2B and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILB857,1-8UNC-3B?
MILB857,1-8UNC-3B is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-202-3428. 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