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Technical Data Sheet
PartsTable / COMPONENT / 9959-C
9959-C ✓ 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: PLASTIC POLYAMIDE NYLON OVERALL, thickness: 0.050 INCHES NOMINAL IN, hole_diameter: 0.150 INCHES NOMINAL IN, overall_diameter: 0.312 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 5310-01-004-6955, 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
9959-C
NSN: 5310-01-004-6955
FSC: 5310
CAGE: 72653 — GC/WALDOM INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
thickness0.050 INCHES NOMINAL IN
hole_diameter0.150 INCHES NOMINAL IN
overall_diameter0.312 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-004-6955
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 9959-C · 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: PLASTIC POLYAMIDE NYLON OVERALL
•
HOLE DIAMETER: 0.150 INCHES NOMINAL IN
•
THICKNESS: 0.050 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.312 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
HOLE DIAMETER0.150 INCHES NOMINAL IN
THICKNESS0.050 INCHES NOMINAL IN
OVERALL DIAMETER0.312 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
SCB70482Interchangeable
interchangeable cross-reference
interchangeable
50596Interchangeable
interchangeable cross-reference
interchangeable
33736Interchangeable
interchangeable cross-reference
interchangeable
120X 9/16 (12 IN. LG)Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 9959-C?
9959-C is a WASHER,FLAT.
What parts can replace 9959-C?
There are 4 known substitutes for 9959-C: SCB70482, 50596, 33736 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 9959-C?
9959-C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-004-6955. 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