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SS243 ✓ 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 VALVE,POPPET,ENGINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, thickness: 0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN, hole_diameter: 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN, overall_diameter: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM 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 5310-01-066-1901, 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
SS243
NSN: 5310-01-066-1901
FSC: 5310
CAGE: 29440 — W. M. BERG, INC. (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
thickness0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
hole_diameter0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
overall_diameter0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-066-1901
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SS243 · 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
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 303 OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
•
OVERALL DIAMETER: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
•
THICKNESS: 0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
MATERIALSTEEL COMP 303 OVERALL
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
OVERALL DIAMETER0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
THICKNESS0.031 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
0240-02Interchangeable
interchangeable cross-reference
interchangeable
SS243Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SS243?
SS243 is a VALVE,POPPET,ENGINE.
What parts can replace SS243?
There are 2 known substitutes for SS243: 0240-02, SS243. Substitute compatibility should be verified for your specific system.
What is the NSN for SS243?
SS243 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-066-1901. 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