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4006661 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4006661: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.418 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-373-2993, 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
4006661
NSN: 5306-00-373-2993
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
head_height0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
thread_class3A A
thread_length0.418 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.815 INCHES MINIMUM AND 1.855 INCHES MAXIMUM IN
shoulder_length1.325 INCHES MINIMUM AND 1.345 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.3739 INCHES MINIMUM AND 0.3743 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCHROMIUM GRIP
width_between_flats0.375 INCHES NOMINAL IN
NSN5306-00-373-2993
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4006661 · 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
•
EXTENDED WASHER THICKNESS: 0.070 INCHES MINIMUM IN
•
HEAD HEIGHT: 0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.815 INCHES MINIMUM AND 1.855 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.325 INCHES MINIMUM AND 1.345 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2406 ASSN STD SINGLE TREATMENT RESPONSE GRIP
•
EXTENDED WASHER DIAMETER: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.3739 INCHES MINIMUM AND 0.3743 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.418 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.070 INCHES MINIMUM IN
HEAD HEIGHT0.328 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
FASTENER LENGTH1.815 INCHES MINIMUM AND 1.855 INCHES MAXIMUM IN
SHOULDER LENGTH1.325 INCHES MINIMUM AND 1.345 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2406 ASSN STD SINGLE TREATMENT RESPONSE GRIP
EXTENDED WASHER DIAMETER0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
SHOULDER DIAMETER0.3739 INCHES MINIMUM AND 0.3743 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.418 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
CRITICALITY CODE JUSTIFICATIONAGAV
SUBSTITUTES & CROSS-REFERENCES 2
5306PL1495225Reference document
Same NSN cross-reference
Reference document — Informative reference only
400661Same 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 4006661?
4006661 is a BOLT,SHOULDER.
What parts can replace 4006661?
There are 2 known substitutes for 4006661: 5306PL1495225, 400661. Substitute compatibility should be verified for your specific system.
What is the NSN for 4006661?
4006661 is cataloged in the U.S. Government catalog under NSN 5306-00-373-2993. 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.