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A501818 ✓ 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 PIN,SHOULDER,HEADED is a the manufacturer industrial component. Key specifications include height: 0.031 INCHES NOMINAL IN, material: COPPER ALLOY 360 OVERALL, head_style: FLAT, first_end_style: SQUARE, style_designator: SHOULDER, first_step_length: 0.188 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-274-9993, 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
A501818
NSN: 5315-00-274-9993
FSC: 5315
CAGE: 23667 — SMITHS DETECTION INC. DBA SMITHS DETECTION INC CASC (USA)
SPECIFICATIONS
height0.031 INCHES NOMINAL IN
materialCOPPER ALLOY 360 OVERALL
head_styleFLAT
first_end_styleSQUARE
style_designatorSHOULDER
first_step_length0.188 INCHES NOMINAL IN
pin_head_diameter0.125 INCHES NOMINAL IN
under_head_length0.250 INCHES NOMINAL IN
second_step_length0.132 INCHES NOMINAL IN
first_step_diameter0.092 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
second_step_diameter0.063 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
NSN5315-00-274-9993
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A501818 · 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
•
FIRST STEP DIAMETER: 0.092 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
•
FIRST STEP LENGTH: 0.188 INCHES NOMINAL IN
•
UNDER HEAD LENGTH: 0.250 INCHES NOMINAL IN
•
PIN HEAD DIAMETER: 0.125 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
•
HEIGHT: 0.031 INCHES NOMINAL IN
•
HEAD STYLE: FLAT
•
SECOND STEP LENGTH: 0.132 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST STEP DIAMETER0.092 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN
FIRST STEP LENGTH0.188 INCHES NOMINAL IN
UNDER HEAD LENGTH0.250 INCHES NOMINAL IN
PIN HEAD DIAMETER0.125 INCHES NOMINAL IN
FIRST END STYLESQUARE
HEIGHT0.031 INCHES NOMINAL IN
HEAD STYLEFLAT
SECOND STEP LENGTH0.132 INCHES NOMINAL IN
SECOND STEP DIAMETER0.063 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
STYLE DESIGNATORSHOULDER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
9758Interchangeable
interchangeable cross-reference
interchangeable
3702-045-G001Interchangeable
interchangeable cross-reference
interchangeable
3702045G001-000Interchangeable
interchangeable cross-reference
interchangeable
89-9758Interchangeable
interchangeable cross-reference
interchangeable
DWG5120-00-343-8210Interchangeable
interchangeable cross-reference
interchangeable
633B009758Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A501818?
A501818 is a PIN,SHOULDER,HEADED.
What parts can replace A501818?
There are 9 known substitutes for A501818: 9758, 3702-045-G001, 3702045G001-000 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A501818?
A501818 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-274-9993. 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