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ST3M553D14-78 — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M553D14-78: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OVERALL, head_style: DOUBLE HEXAGON W/HOLE, grip_length: 4.865 INCHES MINIMUM AND 4.885 INCHES MAXIMUM IN, head_height: 0.798 INCHES MINIMUM AND 0.818 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.8730 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-025-4826, 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
ST3M553D14-78
NSN: 5306-01-025-4826
FSC: 5306 — Bolts
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
grip_length4.865 INCHES MINIMUM AND 4.885 INCHES MAXIMUM IN
head_height0.798 INCHES MINIMUM AND 0.818 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.8730 INCHES MINIMUM AND 0.8740 INCHES MAXIMUM IN
thread_length1.169 INCHES MINIMUM AND 1.219 INCHES MAXIMUM IN
fastener_length6.054 INCHES MINIMUM AND 6.084 INCHES MAXIMUM IN
hardness_rating39.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_between_flats0.934 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN
NSN5306-01-025-4826
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M553D14-78 · 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: 0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.798 INCHES MINIMUM AND 0.818 INCHES MAXIMUM IN
•
FASTENER LENGTH: 6.054 INCHES MINIMUM AND 6.084 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 1.428 INCHES MINIMUM AND 1.438 INCHES MAXIMUM IN
•
THREAD LENGTH: 1.169 INCHES MINIMUM AND 1.219 INCHES MAXIMUM IN
•
HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
•
SHANK UNTHREADED HOLE DIAMETER: 0.093 INCHES MINIMUM AND 0.098 INCHES MAXIMUM FIRST HOLE IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.188 INCHES MINIMUM AND 0.208 INCHES MAXIMUM IN
HEAD HEIGHT0.798 INCHES MINIMUM AND 0.818 INCHES MAXIMUM IN
FASTENER LENGTH6.054 INCHES MINIMUM AND 6.084 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONNAS672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER1.428 INCHES MINIMUM AND 1.438 INCHES MAXIMUM IN
THREAD LENGTH1.169 INCHES MINIMUM AND 1.219 INCHES MAXIMUM IN
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM OVERALL
SHANK UNTHREADED HOLE DIAMETER0.093 INCHES MINIMUM AND 0.098 INCHES MAXIMUM FIRST HOLE IN
NOMINAL THREAD DIAMETER0.875 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
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 ST3M553D14-78?
ST3M553D14-78 is a BOLT,SHEAR.
What is the NSN for ST3M553D14-78?
ST3M553D14-78 is cataloged in the U.S. Government catalog under NSN 5306-01-025-4826. 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.