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A51C43594 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A51C43594: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, head_height: 0.140 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.319 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-003-3860, 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
A51C43594
NSN: 5306-00-003-3860
FSC: 5306 — Bolts
CAGE: 61174 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
head_height0.140 INCHES NOMINAL IN
thread_class3A A
thread_length0.319 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.279 INCHES NOMINAL IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
shoulder_length0.950 INCHES MINIMUM AND 0.960 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.3731 INCHES MINIMUM AND 0.3737 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM OVERALL
NSN5306-00-003-3860
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A51C43594 · 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
•
HEAD HEIGHT: 0.140 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.279 INCHES NOMINAL IN
•
SHOULDER LENGTH: 0.950 INCHES MINIMUM AND 0.960 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-8837,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.3731 INCHES MINIMUM AND 0.3737 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.319 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.140 INCHES NOMINAL IN
FASTENER LENGTH1.279 INCHES NOMINAL IN
SHOULDER LENGTH0.950 INCHES MINIMUM AND 0.960 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-8837,TYPE 2,CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.3731 INCHES MINIMUM AND 0.3737 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.319 INCHES MINIMUM AND 0.329 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONG-1013,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-004-7044 5306-00-007-6129 5306-00-008-7899 5306-00-009-4739 5306-00-118-7332 5306-00-151-1777 5306-00-255-4507 5306-01-101-2459
SUBSTITUTES & CROSS-REFERENCES 1
A51C43594-13Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A51C43594?
A51C43594 is a BOLT,SHOULDER.
What parts can replace A51C43594?
There is 1 known substitute for A51C43594: A51C43594-13. Substitute compatibility should be verified for your specific system.
What is the NSN for A51C43594?
A51C43594 is cataloged in the U.S. Government catalog under NSN 5306-00-003-3860. 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.