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Technical Data Sheet
PartsTable / COMPONENT / AN175-42A
AN175-42A ✓ 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 BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include hole_type: DRILLED, head_style: HEXAGON, grip_length: 3.797 INCHES MINIMUM AND 3.828 INCHES MAXIMUM IN, head_height: 0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.3112 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-151-3196, 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
AN175-42A
NSN: 5306-00-151-3196
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
hole_typeDRILLED
head_styleHEXAGON
grip_length3.797 INCHES MINIMUM AND 3.828 INCHES MAXIMUM IN
head_height0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.3112 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM IN
hole_diameter0.070 INCHES NOMINAL IN
hole_quantity1
thread_length0.500 INCHES MINIMUM AND 0.578 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES BEARING SURFACE OF HEAD
fastener_length4.328 INCHES MINIMUM AND 4.375 INCHES MAXIMUM IN
NSN5306-00-151-3196
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN175-42A · 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 SERIES DESIGNATOR: UNF
•
THREAD LENGTH: 0.500 INCHES MINIMUM AND 0.578 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 24
•
MATERIAL: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
•
HOLE QUANTITY: 1
•
WIDTH BETWEEN FLATS: 0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF
THREAD LENGTH0.500 INCHES MINIMUM AND 0.578 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH24
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
HOLE QUANTITY1
WIDTH BETWEEN FLATS0.490 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
FASTENER LENGTH4.328 INCHES MINIMUM AND 4.375 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
AN75A25Upgraded Successor
successor cross-reference
successor
B6812Upgraded Successor
successor cross-reference
successor
MS20074-05-25Upgraded Successor
successor cross-reference
successor
AN75A34Upgraded Successor
successor cross-reference
successor
MS20074-05-34Upgraded Successor
successor cross-reference
successor
AN75A40Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN175-42A?
AN175-42A is a BOLT,CLOSE TOLERANCE.
What parts can replace AN175-42A?
There are 20 known substitutes for AN175-42A: AN75A25, B6812, MS20074-05-25 and 17 more. Substitute compatibility should be verified for your specific system.
Is AN175-42A still available?
AN175-42A 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