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PartsTable / COMPONENT / HL-21023 ITEM 1
HL-21023 ITEM 1 ✓ 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: COPPER ALLOY OVERALL, thickness: 0.031 INCHES NOMINAL IN, hole_diameter: 0.406 INCHES NOMINAL IN, overall_diameter: 0.687 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-193-9742, 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
HL-21023 ITEM 1
NSN: 5310-00-193-9742
FSC: 5310
CAGE: 59379 — ATLAS COPCO HOLYOKE INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.406 INCHES NOMINAL IN
overall_diameter0.687 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-193-9742
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: HL-21023 ITEM 1 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY OVERALL
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.406 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.687 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-576 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
MATERIALCOPPER ALLOY OVERALL
THICKNESS0.031 INCHES NOMINAL IN
HOLE DIAMETER0.406 INCHES NOMINAL IN
OVERALL DIAMETER0.687 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
KC9125Interchangeable
interchangeable cross-reference
interchangeable
R437Interchangeable
interchangeable cross-reference
interchangeable
FF-W-92 TYAInterchangeable
interchangeable cross-reference
interchangeable
3HB913Interchangeable
interchangeable cross-reference
interchangeable
5152148Interchangeable
interchangeable cross-reference
interchangeable
R8321664-43Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HL-21023 ITEM 1?
HL-21023 ITEM 1 is a WASHER,FLAT.
What parts can replace HL-21023 ITEM 1?
There are 8 known substitutes for HL-21023 ITEM 1: KC9125, R437, FF-W-92 TYA and 5 more. Substitute compatibility should be verified for your specific system.
Is HL-21023 ITEM 1 still available?
HL-21023 ITEM 1 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