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AN173-7A — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

AN173-7A: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 4130 OVERALL, head_style: HEXAGON, grip_length: 2.734 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN, head_height: 0.515 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 1.343 INCHES MINIMUM AND 1.422 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-182-1520, 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
AN173-7A
NSN: 5306-00-182-1520
NIINs: 001821520, 002928282, 005185703
FSC: 5306 — Bolts
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 4130 OVERALL
head_styleHEXAGON
grip_length2.734 INCHES MINIMUM AND 2.766 INCHES MAXIMUM IN
head_height0.515 INCHES MINIMUM AND 0.547 INCHES MAXIMUM IN
thread_class3A A
thread_length1.343 INCHES MINIMUM AND 1.422 INCHES MAXIMUM IN
fastener_length4.109 INCHES MINIMUM AND 4.156 INCHES MAXIMUM IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_between_flats1.428 INCHES MINIMUM AND 1.441 INCHES MAXIMUM IN
NSN5306-00-182-1520
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: AN173-7A · 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
•
SURFACE FINISH: 63.0 MICROINCHES GRIP
•
HEAD HEIGHT: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
THREAD LENGTH: 0.375 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
HARDNESS RATING: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
•
CRITICALITY CODE JUSTIFICATION: AGAV
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
HEAD HEIGHT0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
FASTENER LENGTH0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD LENGTH0.375 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
CRITICALITY CODE JUSTIFICATIONAGAV
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 1
NAS53A7Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AN173-7A?
AN173-7A is a BOLT,MACHINE.
What parts can replace AN173-7A?
There is 1 known substitute for AN173-7A: NAS53A7. Substitute compatibility should be verified for your specific system.
What is the NSN for AN173-7A?
AN173-7A is cataloged in the U.S. Government catalog under NSN 5306-00-182-1520. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.