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PartsTable / COMPONENT / 557109R1
557109R1 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, thickness: 0.048 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN, hole_diameter: 0.256 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN, overall_diameter: 0.490 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-195-5091, 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
557109R1
NSN: 5310-01-195-5091
FSC: 5310
CAGE: 29510 — KOMATSU AMERICAN INTL CO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
thickness0.048 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
hole_diameter0.256 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
overall_diameter0.490 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-195-5091
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 557109R1 · 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
•
OVERALL DIAMETER: 0.490 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
THICKNESS: 0.048 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
•
HOLE DIAMETER: 0.256 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL DIAMETER0.490 INCHES MINIMUM AND 0.519 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OVERALL
THICKNESS0.048 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
HOLE DIAMETER0.256 INCHES MINIMUM AND 0.276 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
120385Interchangeable
interchangeable cross-reference
interchangeable
1905-103Interchangeable
interchangeable cross-reference
interchangeable
D11076-28A24Interchangeable
interchangeable cross-reference
interchangeable
104-1S12MInterchangeable
interchangeable cross-reference
interchangeable
FFW92Interchangeable
interchangeable cross-reference
interchangeable
MS-120-A-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 557109R1?
557109R1 is a WASHER,FLAT.
What parts can replace 557109R1?
There are 6 known substitutes for 557109R1: 120385, 1905-103, D11076-28A24 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 557109R1?
557109R1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-195-5091. 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