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1289C42-3 — Technical Data Sheet

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— · 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: 0.126 INCHES NOMINAL IN, hardness_rating: 82.0 ROCKWELL B MINIMUM AND 90.0 ROCKWELL B MAXIMUM, overall_diameter: 0.250 INCHES NOMINAL IN, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System under NSN 5310-00-639-1500, 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
1289C42-3
NSN: 5310-00-639-1500
FSC: 5310
CAGE: 89944 — ELBITAMERICA, INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.031 INCHES NOMINAL IN
hole_diameter0.126 INCHES NOMINAL IN
hardness_rating82.0 ROCKWELL B MINIMUM AND 90.0 ROCKWELL B MAXIMUM
overall_diameter0.250 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-B-750 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-639-1500
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1289C42-3 · 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
•
HARDNESS RATING: 82.0 ROCKWELL B MINIMUM AND 90.0 ROCKWELL B MAXIMUM
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-750 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
THICKNESS: 0.031 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.126 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
HARDNESS RATING82.0 ROCKWELL B MINIMUM AND 90.0 ROCKWELL B MAXIMUM
MATERIALCOPPER ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-750 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
THICKNESS0.031 INCHES NOMINAL IN
HOLE DIAMETER0.126 INCHES NOMINAL IN
OVERALL DIAMETER0.250 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
5920PL0647905InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
S222002InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GE8421-3InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
533-639InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1289C42-3?
1289C42-3 is a WASHER,FLAT.
What parts can replace 1289C42-3?
There are 4 known substitutes for 1289C42-3: 5920PL0647905, S222002, GE8421-3 and 1 more. Substitute compatibility should be verified for your specific system.
Is 1289C42-3 still available?
1289C42-3 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: October 2026