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Technical Data Sheet
PartsTable / COMPONENT / 520A123
520A123 ✓ 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, thread_class: 2A STUD THREAD A, thread_length: 0.375 INCHES MAXIMUM NUT THREAD IN, overall_length: 2.375 INCHES NOMINAL IN, surface_treatment: ZINC OVERALL, nominal_thread_size: 0.250 INCHES STUD THREAD IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-493-7158, 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
520A123
NSN: 5307-00-493-7158
FSC: 5307
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
materialSTEEL
thread_class2A STUD THREAD A
thread_length0.375 INCHES MAXIMUM NUT THREAD IN
overall_length2.375 INCHES NOMINAL IN
surface_treatmentZINC OVERALL
nominal_thread_size0.250 INCHES STUD THREAD IN
thread_quantity_per_inch20 NUT THREAD
thread_series_designatorUNIFIED NATIONAL COARSE (UNC) NUT THREAD
material_document_and_classificationSAE 1112 ASSN STD SINGLE MATERIAL RESPONSE
NSN5307-00-493-7158
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 520A123 · 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
•
MATERIAL: STEEL
•
NOMINAL THREAD SIZE: 0.250 INCHES NUT THREAD IN
•
THREAD SERIES DESIGNATOR: UNF STUD THREAD
•
THREAD LENGTH: 0.562 INCHES NOMINAL STUD THREAD IN
•
THREAD QUANTITY PER INCH: 20 NUT THREAD
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS2A STUD THREAD A
MATERIALSTEEL
NOMINAL THREAD SIZE0.250 INCHES NUT THREAD IN
THREAD SERIES DESIGNATORUNF STUD THREAD
OVERALL LENGTH2.375 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES STUD THREAD IN
THREAD LENGTH0.562 INCHES NOMINAL STUD THREAD IN
THREAD QUANTITY PER INCH20 NUT THREAD
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC) NUT THREAD
THREAD LENGTH0.375 INCHES MAXIMUM NUT THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
4005882-3Interchangeable
interchangeable cross-reference
interchangeable
510521-11Interchangeable
interchangeable cross-reference
interchangeable
21-20302-105AND28-20003-309Interchangeable
interchangeable cross-reference
interchangeable
0100-26Interchangeable
interchangeable cross-reference
interchangeable
1011-8-0100-26Interchangeable
interchangeable cross-reference
interchangeable
6520NCM010041Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520A123?
520A123 is a STUD,PLAIN.
What parts can replace 520A123?
There are 8 known substitutes for 520A123: 4005882-3, 510521-11, 21-20302-105AND28-20003-309 and 5 more. Substitute compatibility should be verified for your specific system.
Is 520A123 still available?
520A123 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