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520A185 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include head_style: HEADLESS (SETSCREW), point_style: FLAT, thread_class: 2A A, thread_length: 1.250 INCHES MAXIMUM IN, fastener_length: 1.250 INCHES NOMINAL IN, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-356-1608, 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
520A185
NSN: 5305-00-356-1608
FSC: 5305
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
head_styleHEADLESS (SETSCREW)
point_styleFLAT
thread_class2A A
thread_length1.250 INCHES MAXIMUM IN
fastener_length1.250 INCHES NOMINAL IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
internal_drive_styleSLOT
nominal_thread_diameter0.500 INCHES IN
thread_quantity_per_inch20
thread_series_designatorUNF
NSN5305-00-356-1608
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 520A185 · 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 DIRECTION: RIGHT-HAND
•
SURFACE TREATMENT: ZINC OVERALL
•
THREAD LENGTH: 1.250 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: SLOT
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: HEADLESS (SETSCREW)
•
THREAD SERIES DESIGNATOR: UNF
•
FASTENER LENGTH: 1.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
SURFACE TREATMENTZINC OVERALL
THREAD LENGTH1.250 INCHES MAXIMUM IN
INTERNAL DRIVE STYLESLOT
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEHEADLESS (SETSCREW)
THREAD SERIES DESIGNATORUNF
FASTENER LENGTH1.250 INCHES NOMINAL IN
THREAD QUANTITY PER INCH20
DEPARTURE FROM CITED DESIGNATORAS MODIFIED BY SURFACE TREATMENT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
A51P9119-1Interchangeable
interchangeable cross-reference
interchangeable
12119Interchangeable
interchangeable cross-reference
interchangeable
15245 BLK.OXIDEInterchangeable
interchangeable cross-reference
interchangeable
MS35214-26Interchangeable
interchangeable cross-reference
interchangeable
41W3011Interchangeable
interchangeable cross-reference
interchangeable
34219-01Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 520A185?
520A185 is a SETSCREW.
What parts can replace 520A185?
There are 15 known substitutes for 520A185: A51P9119-1, 12119, 15245 BLK.OXIDE and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 520A185?
520A185 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-356-1608. 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