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PartsTable / COMPONENT / CL4520
CL4520 ✓ 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,STRAIGHT,HEADED is a the manufacturer industrial component. Key specifications include diameter: 0.309 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN, material: STEEL COMP 1015 OVERALL, chamfer_length: 0.032 INCHES NOMINAL IN, features_provided: CASEHARDENED, pin_chamfer_angle: 30.0 DEGREES NOMINAL, under_head_length: 2.266 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 5315-00-354-6851, 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
CL4520
NSN: 5315-00-354-6851
FSC: 5315
CAGE: 77873 — ROCKFORD POWERTRAIN INC DIV POWERTRAIN ROCKFORD, INC. (USA)
SPECIFICATIONS
diameter0.309 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
materialSTEEL COMP 1015 OVERALL
chamfer_length0.032 INCHES NOMINAL IN
features_providedCASEHARDENED
pin_chamfer_angle30.0 DEGREES NOMINAL
under_head_length2.266 INCHES NOMINAL IN
material_document_and_classificationQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-00-354-6851
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: CL4520 · 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
•
DIAMETER: 0.309 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
UNDER HEAD LENGTH: 2.266 INCHES NOMINAL IN
•
MATERIAL: STEEL COMP 1015 OVERALL
•
CHAMFER LENGTH: 0.032 INCHES NOMINAL IN
•
FEATURES PROVIDED: CASEHARDENED
•
PIN CHAMFER ANGLE: 30.0 DEGREES NOMINAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
DIAMETER0.309 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
UNDER HEAD LENGTH2.266 INCHES NOMINAL IN
MATERIALSTEEL COMP 1015 OVERALL
CHAMFER LENGTH0.032 INCHES NOMINAL IN
FEATURES PROVIDEDCASEHARDENED
PIN CHAMFER ANGLE30.0 DEGREES NOMINAL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
BA10133-7Interchangeable
interchangeable cross-reference
interchangeable
105-521Interchangeable
interchangeable cross-reference
interchangeable
SMB425581Interchangeable
interchangeable cross-reference
interchangeable
PD195Interchangeable
interchangeable cross-reference
interchangeable
PT521Interchangeable
interchangeable cross-reference
interchangeable
PB195Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CL4520?
CL4520 is a PIN,STRAIGHT,HEADED.
What parts can replace CL4520?
There are 8 known substitutes for CL4520: BA10133-7, 105-521, SMB425581 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for CL4520?
CL4520 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-354-6851. 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