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PartsTable / COMPONENT / AN178H30
AN178H30 ✓ 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: 2.296 INCHES MINIMUM AND 2.328 INCHES MAXIMUM IN, head_height: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.4986 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-144-3711, 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
AN178H30
NSN: 5306-00-144-3711
FSC: 5306
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4140 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
hole_typeDRILLED
head_styleHEXAGON
grip_length2.296 INCHES MINIMUM AND 2.328 INCHES MAXIMUM IN
head_height0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.4986 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN
hole_diameter0.070 INCHES NOMINAL IN
hole_quantity1
thread_length0.750 INCHES MINIMUM AND 0.895 INCHES MAXIMUM IN
fastener_length3.078 INCHES MINIMUM AND 3.125 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
NSN5306-00-144-3711
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN178H30 · 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
•
FASTENER LENGTH: 3.078 INCHES MINIMUM AND 3.125 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
•
HEAD STYLE: HEXAGON
•
GRIP DIAMETER: 0.4986 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4140 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
•
THREAD QUANTITY PER INCH: 20
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
HOLE DIAMETER: 0.070 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH3.078 INCHES MINIMUM AND 3.125 INCHES MAXIMUM IN
HEAD HEIGHT0.265 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
HEAD STYLEHEXAGON
GRIP DIAMETER0.4986 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN
MATERIALSTEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4140 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
THREAD QUANTITY PER INCH20
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
HOLE DIAMETER0.070 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
DISTANCE FROM HEAD LARGEST BEARING SURFACE TO SHANK HOLE CENTER2.905 INCHES MAXIMUM AND 2.937 INCHES MAXIMUM FIRST HOLE IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
AN173-21AUpgraded Successor
successor cross-reference
successor
B6812Upgraded Successor
successor cross-reference
successor
AN173H21AUpgraded Successor
successor cross-reference
successor
AN174-40Upgraded Successor
successor cross-reference
successor
AN174H40Upgraded Successor
successor cross-reference
successor
AN174H37Upgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN178H30?
AN178H30 is a BOLT,CLOSE TOLERANCE.
What parts can replace AN178H30?
There are 23 known substitutes for AN178H30: AN173-21A, B6812, AN173H21A and 20 more. Substitute compatibility should be verified for your specific system.
Is AN178H30 still available?
AN178H30 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