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11657640 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

11657640: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1541 OVERALL, head_style: HEXAGON, head_height: 0.348 INCHES MINIMUM AND 0.371 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.610 INCHES MINIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-145-2196, 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
11657640
NSN: 5306-00-145-2196
FSC: 5306 — Bolts
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL COMP 1541 OVERALL
head_styleHEXAGON
head_height0.348 INCHES MINIMUM AND 0.371 INCHES MAXIMUM IN
thread_class2A A
thread_length0.610 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.980 INCHES MINIMUM AND 1.040 INCHES MAXIMUM IN
hardness_rating23.0 ROCKWELL C NOMINAL OVERALL
shoulder_length0.310 INCHES NOMINAL FIRST SHOULDER IN
special_featuresSTRIP TYPE LOCKING ELEMENT IN THREADS 0.440 IN. LONG IN
thread_directionRIGHT-HAND
shoulder_diameter0.660 INCHES NOMINAL FIRST SHOULDER IN
NSN5306-00-145-2196
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 11657640 · 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: 0.348 INCHES MINIMUM AND 0.371 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.980 INCHES MINIMUM AND 1.040 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.310 INCHES NOMINAL FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.660 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD LENGTH: 0.610 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 23.0 ROCKWELL C NOMINAL OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.348 INCHES MINIMUM AND 0.371 INCHES MAXIMUM IN
FASTENER LENGTH0.980 INCHES MINIMUM AND 1.040 INCHES MAXIMUM IN
SHOULDER LENGTH0.310 INCHES NOMINAL FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC 1ST TREATMENT RESPONSE OR QQ-Z-325,TY 2,CL 3 FED SPEC 2ND TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.660 INCHES NOMINAL FIRST SHOULDER IN
THREAD LENGTH0.610 INCHES MINIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING23.0 ROCKWELL C NOMINAL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.438 INCHES IN
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
975331Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 11657640?
11657640 is a BOLT,SHOULDER.
What parts can replace 11657640?
There is 1 known substitute for 11657640: 975331. Substitute compatibility should be verified for your specific system.
What is the NSN for 11657640?
11657640 is cataloged in the U.S. Government catalog under NSN 5306-00-145-2196. 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.