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BACB30FD12-40Y — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACB30FD12-40Y: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 8740 OVERALL, head_style: DOUBLE HEXAGON EXTENDED WASHER, head_height: 0.711 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.968 INCHES MINIMUM AND 1.018 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-274-7280, 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
BACB30FD12-40Y
NSN: 5306-01-274-7280
FSC: 5306 — Bolts
CAGE: 06725 — SPS TECHNOLOGIES, LLC DBA AIR INDUSTRIES COMPANY DIV AIR INDUSTRIES COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 8740 OVERALL
head_styleDOUBLE HEXAGON EXTENDED WASHER
head_height0.711 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN
thread_class3A A
thread_length0.968 INCHES MINIMUM AND 1.018 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length3.478 INCHES MINIMUM AND 3.508 INCHES MAXIMUM IN
shoulder_length2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.7792 INCHES MINIMUM AND 0.7802 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_between_flats0.797 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN
NSN5306-01-274-7280
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACB30FD12-40Y · 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: 0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.711 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.478 INCHES MINIMUM AND 3.508 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 1.220 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.7792 INCHES MINIMUM AND 0.7802 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.968 INCHES MINIMUM AND 1.018 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.168 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN
HEAD HEIGHT0.711 INCHES MINIMUM AND 0.721 INCHES MAXIMUM IN
FASTENER LENGTH3.478 INCHES MINIMUM AND 3.508 INCHES MAXIMUM IN
SHOULDER LENGTH2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416 TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER1.220 INCHES MINIMUM AND 1.230 INCHES MAXIMUM IN
SHOULDER DIAMETER0.7792 INCHES MINIMUM AND 0.7802 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.968 INCHES MINIMUM AND 1.018 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BACB30FD12-40Y?
BACB30FD12-40Y is a BOLT,SHOULDER.
What is the NSN for BACB30FD12-40Y?
BACB30FD12-40Y is cataloged in the U.S. Government catalog under NSN 5306-01-274-7280. 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.