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Technical Data Sheet
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B1557 ✓ 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 WASHER,LOCK is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-011-2723, 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
B1557
NSN: 5310-00-011-2723
FSC: 5310
CAGE: 82983 — AMF INC AMF YORK DIV (USA)
SPECIFICATIONS
Part NumberB1557
NSN5310-00-011-2723
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B1557 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
KPIN3780Interchangeable
interchangeable cross-reference
interchangeable
199Interchangeable
interchangeable cross-reference
interchangeable
112723Interchangeable
interchangeable cross-reference
interchangeable
710-13-1-8DInterchangeable
interchangeable cross-reference
interchangeable
710-13-1/8DInterchangeable
interchangeable cross-reference
interchangeable
10-199Interchangeable
Knife,craftsman's
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B1557?
B1557 is a WASHER,LOCK.
What parts can replace B1557?
There are 29 known substitutes for B1557: KPIN3780, 199, 112723 and 26 more. Substitute compatibility should be verified for your specific system.
Is B1557 still available?
B1557 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