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PC9581 ✓ 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: 0.032 INCHES NOMINAL IN, hole_diameter: 0.172 INCHES NOMINAL IN, overall_diameter: 0.375 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 5310-00-487-7484, 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
PC9581
NSN: 5310-00-487-7484
FSC: 5310
CAGE: 79172 — SIEMENS WATER TECHNOLOGIES CORP. DIV WALLACE & TIERNAN PRODUCTS (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thickness0.032 INCHES NOMINAL IN
hole_diameter0.172 INCHES NOMINAL IN
overall_diameter0.375 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationECLIPSALOY 70 1/2 HARD FSCM 19315 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-487-7484
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: PC9581 · 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
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ECLIPSALOY 70 1/2 HARD FSCM 19315 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
HOLE DIAMETER: 0.172 INCHES NOMINAL IN
•
THICKNESS: 0.032 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OVERALL DIAMETER: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER HOLE SHAPE STYLEROUND
MATERIALCOPPER ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONECLIPSALOY 70 1/2 HARD FSCM 19315 MFR REF SINGLE MATERIAL RESPONSE OVERALL
HOLE DIAMETER0.172 INCHES NOMINAL IN
THICKNESS0.032 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OVERALL DIAMETER0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
08P10847-2400Interchangeable
interchangeable cross-reference
interchangeable
C6649PC30Interchangeable
interchangeable cross-reference
interchangeable
M2851PC33Interchangeable
interchangeable cross-reference
interchangeable
1175J66 ITEM 28Interchangeable
interchangeable cross-reference
interchangeable
W-08Interchangeable
interchangeable cross-reference
interchangeable
1862740Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is PC9581?
PC9581 is a WASHER,FLAT.
What parts can replace PC9581?
There are 11 known substitutes for PC9581: 08P10847-2400, C6649PC30, M2851PC33 and 8 more. Substitute compatibility should be verified for your specific system.
Is PC9581 still available?
PC9581 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