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ST3M840-6-16F — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M840-6-16F: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: SPLINE EXTENDED WASHER, head_height: 0.327 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.589 INCHES MINIMUM AND 0.639 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-142-9357, 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
ST3M840-6-16F
NSN: 5306-01-142-9357
FSC: 5306 — Bolts
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP XM-13 OVERALL
head_styleSPLINE EXTENDED WASHER
head_height0.327 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
thread_class3A A
thread_length0.589 INCHES MINIMUM AND 0.639 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length1.599 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN
shoulder_length0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.4052 INCHES MINIMUM AND 0.4057 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentALUMINUM AND CHROMATE OVERALL
width_between_flats0.448 INCHES MINIMUM AND 0.455 INCHES MAXIMUM IN
NSN5306-01-142-9357
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M840-6-16F · 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: 0.044 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.327 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.599 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-83488,TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.691 INCHES MINIMUM AND 0.701 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.4052 INCHES MINIMUM AND 0.4057 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.589 INCHES MINIMUM AND 0.639 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.044 INCHES MINIMUM AND 0.064 INCHES MAXIMUM IN
HEAD HEIGHT0.327 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN
FASTENER LENGTH1.599 INCHES MINIMUM AND 1.629 INCHES MAXIMUM IN
SHOULDER LENGTH0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-83488,TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.691 INCHES MINIMUM AND 0.701 INCHES MAXIMUM IN
SHOULDER DIAMETER0.4052 INCHES MINIMUM AND 0.4057 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.589 INCHES MINIMUM AND 0.639 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M840-6-16F?
ST3M840-6-16F is a BOLT,SHOULDER.
What is the NSN for ST3M840-6-16F?
ST3M840-6-16F is cataloged in the U.S. Government catalog under NSN 5306-01-142-9357. 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.