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PartsTable / COMPONENT / 18880L1
18880L1 ✓ 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 OVERALL, thickness: 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN, hole_diameter: 1.002 INCHES NOMINAL IN, hardness_rating: 60.0 ROCKWELL C MINIMUM, overall_diameter: 2.000 INCHES NOMINAL IN, features_provided: CASEHARDENED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-431-7002, 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
18880L1
NSN: 5310-00-431-7002
FSC: 5310
CAGE: 71041 — ALTRA INDUSTRIAL MOTION CORP. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
hole_diameter1.002 INCHES NOMINAL IN
hardness_rating60.0 ROCKWELL C MINIMUM
overall_diameter2.000 INCHES NOMINAL IN
features_providedCASEHARDENED
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-431-7002
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 18880L1 · 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
•
FEATURES PROVIDED: CASEHARDENED
•
THICKNESS: 0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
•
HOLE DIAMETER: 1.002 INCHES NOMINAL IN
•
HARDNESS RATING: 60.0 ROCKWELL C MINIMUM
•
CENTER HOLE SHAPE STYLE: ROUND
•
OVERALL DIAMETER: 2.000 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDCASEHARDENED
THICKNESS0.120 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
HOLE DIAMETER1.002 INCHES NOMINAL IN
HARDNESS RATING60.0 ROCKWELL C MINIMUM
CENTER HOLE SHAPE STYLEROUND
OVERALL DIAMETER2.000 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
45883Interchangeable
interchangeable cross-reference
interchangeable
30860-40736Interchangeable
interchangeable cross-reference
interchangeable
11550P11Interchangeable
interchangeable cross-reference
interchangeable
18880Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18880L1?
18880L1 is a WASHER,FLAT.
What parts can replace 18880L1?
There are 4 known substitutes for 18880L1: 45883, 30860-40736, 11550P11 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18880L1?
18880L1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-431-7002. 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