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A51M42538-11 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A51M42538-11: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DISHED HEXAGON, head_height: 0.188 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 0.438 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-003-6538, 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
A51M42538-11
NSN: 5306-00-003-6538
FSC: 5306 — Bolts
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDISHED HEXAGON
head_height0.188 INCHES NOMINAL IN
thread_class3A A
thread_length0.438 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.930 INCHES MINIMUM AND 2.940 INCHES MAXIMUM IN
shoulder_length2.492 INCHES MINIMUM AND 2.502 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.6226 INCHES MINIMUM AND 0.6232 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM OVERALL
width_between_flats0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
NSN5306-00-003-6538
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A51M42538-11 · 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: 0.188 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.930 INCHES MINIMUM AND 2.940 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 2.492 INCHES MINIMUM AND 2.502 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.6226 INCHES MINIMUM AND 0.6232 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.438 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
SHANK UNTHREADED HOLE DIAMETER: 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: G-1010,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.188 INCHES NOMINAL IN
FASTENER LENGTH2.930 INCHES MINIMUM AND 2.940 INCHES MAXIMUM IN
SHOULDER LENGTH2.492 INCHES MINIMUM AND 2.502 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.6226 INCHES MINIMUM AND 0.6232 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.438 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
SHANK UNTHREADED HOLE DIAMETER0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONG-1010,FSCM 26512 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEDISHED HEXAGON
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

No substitute or cross-reference records for this part.

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 A51M42538-11?
A51M42538-11 is a BOLT,SHOULDER.
What is the NSN for A51M42538-11?
A51M42538-11 is cataloged in the U.S. Government catalog under NSN 5306-00-003-6538. 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.