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BACB30MA6-5 — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACB30MA6-5: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP E4340 OVERALL, head_style: FLAT CHAMFER, head_height: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN, thread_length: 0.345 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-149-1940, 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
BACB30MA6-5
NSN: 5305-01-149-1940
FSC: 5305 — Screws
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP E4340 OVERALL
head_styleFLAT CHAMFER
head_height0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.320 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN
thread_length0.345 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.513 INCHES MINIMUM AND 0.533 INCHES MAXIMUM IN
shoulder_length0.158 INCHES MINIMUM AND 0.168 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.233 INCHES MINIMUM AND 0.234 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-01-149-1940
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACB30MA6-5 · 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
•
WIDTH ACROSS FLATS: 0.079 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.513 INCHES MINIMUM AND 0.533 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.158 INCHES MINIMUM AND 0.168 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.233 INCHES MINIMUM AND 0.234 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.345 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.079 INCHES MINIMUM AND 0.081 INCHES MAXIMUM IN
HEAD HEIGHT0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
FASTENER LENGTH0.513 INCHES MINIMUM AND 0.533 INCHES MAXIMUM IN
SHOULDER LENGTH0.158 INCHES MINIMUM AND 0.168 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.233 INCHES MINIMUM AND 0.234 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.345 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT CHAMFER
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 2
HL202-6-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
L-8052-6-5Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 BACB30MA6-5?
BACB30MA6-5 is a SCREW,SHOULDER.
What parts can replace BACB30MA6-5?
There are 2 known substitutes for BACB30MA6-5: HL202-6-5, L-8052-6-5. Substitute compatibility should be verified for your specific system.
What is the NSN for BACB30MA6-5?
BACB30MA6-5 is cataloged in the U.S. Government catalog under NSN 5305-01-149-1940. 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.