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PartsTable / COMPONENT / 520A423
520A423 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The STUD,PLAIN is a the manufacturer industrial component. Key specifications include material: STEEL COMP 3135 OR STEEL COMP 4140, thread_class: 2A STUD THREAD A, thread_length: 0.938 INCHES MINIMUM STUD THREAD IN, overall_length: 1.938 INCHES NOMINAL IN, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM, thread_direction: RIGHT-HAND NUT THREAD. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-358-3633, 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
520A423
NSN: 5307-00-358-3633
FSC: 5307
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
materialSTEEL COMP 3135 OR STEEL COMP 4140
thread_class2A STUD THREAD A
thread_length0.938 INCHES MINIMUM STUD THREAD IN
overall_length1.938 INCHES NOMINAL IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
thread_directionRIGHT-HAND NUT THREAD
nominal_thread_size0.312 INCHES NUT THREAD IN
thread_quantity_per_inch18 STUD THREAD
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) STUD THREAD
NSN5307-00-358-3633
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 520A423 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD CLASS: 2A STUD THREAD A
•
THREAD DIRECTION: RIGHT-HAND NUT THREAD
•
THREAD SERIES DESIGNATOR: UNF NUT THREAD
•
MATERIAL: STEEL COMP 3135 OR STEEL COMP 4140
•
THREAD QUANTITY PER INCH: 18 STUD THREAD
•
NOMINAL THREAD SIZE: 0.312 INCHES NUT THREAD IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A STUD THREAD A
THREAD DIRECTIONRIGHT-HAND NUT THREAD
THREAD SERIES DESIGNATORUNF NUT THREAD
MATERIALSTEEL COMP 3135 OR STEEL COMP 4140
THREAD QUANTITY PER INCH18 STUD THREAD
NOMINAL THREAD SIZE0.312 INCHES NUT THREAD IN
NOMINAL THREAD SIZE0.312 INCHES STUD THREAD IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) STUD THREAD
THREAD QUANTITY PER INCH24 NUT THREAD
THREAD LENGTH0.625 INCHES MINIMUM NUT THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
020011Interchangeable
interchangeable cross-reference
interchangeable
R311Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520A423?
520A423 is a STUD,PLAIN.
What parts can replace 520A423?
There are 2 known substitutes for 520A423: 020011, R311. Substitute compatibility should be verified for your specific system.
Is 520A423 still available?
520A423 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