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Technical Data Sheet
PartsTable / COMPONENT / BS4-1595PC6
BS4-1595PC6 ✓ 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: 0.250 INCHES NOMINAL IN, hole_diameter: 0.406 INCHES NOMINAL IN, overall_diameter: 1.500 INCHES NOMINAL 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 5310-00-264-0129, 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
BS4-1595PC6
NSN: 5310-00-264-0129
FSC: 5310
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.250 INCHES NOMINAL IN
hole_diameter0.406 INCHES NOMINAL IN
overall_diameter1.500 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-B-639 FED SPEC 1ST MATERIAL RESPONSE AND QQ-B-637 FED SPEC 2ND MATERIAL RESPONSE OVERALL
NSN5310-00-264-0129
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: BS4-1595PC6 · 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-B-639 FED SPEC 1ST MATERIAL RESPONSE AND QQ-B-637 FED SPEC 2ND MATERIAL RESPONSE OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY OVERALL
•
THICKNESS: 0.250 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.406 INCHES NOMINAL IN
•
OVERALL DIAMETER: 1.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-639 FED SPEC 1ST MATERIAL RESPONSE AND QQ-B-637 FED SPEC 2ND MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
MATERIALCOPPER ALLOY OVERALL
THICKNESS0.250 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER0.406 INCHES NOMINAL IN
OVERALL DIAMETER1.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
K9Interchangeable
interchangeable cross-reference
interchangeable
2624FRInterchangeable
interchangeable cross-reference
interchangeable
84AInterchangeable
interchangeable cross-reference
interchangeable
K9-2Interchangeable
interchangeable cross-reference
interchangeable
W292A37Interchangeable
interchangeable cross-reference
interchangeable
240HS6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BS4-1595PC6?
BS4-1595PC6 is a WASHER,FLAT.
What parts can replace BS4-1595PC6?
There are 6 known substitutes for BS4-1595PC6: K9, 2624FR, 84A and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BS4-1595PC6?
BS4-1595PC6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-264-0129. 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