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BACB30LU4-26X — SCREW,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACB30LU4-26X: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.455 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN, thread_length: 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-217-2923, 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
BACB30LU4-26X
NSN: 5305-01-217-2923
FSC: 5305 — Screws
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 8740 OVERALL
head_styleFLAT COUNTERSUNK
thread_class3A A
head_diameter0.455 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
thread_length0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
shoulder_length1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
shoulder_diameter0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5305-01-217-2923
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACB30LU4-26X · 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
•
FASTENER LENGTH: 2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY2,CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.400 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR AMS6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
FASTENER LENGTH2.035 INCHES MINIMUM AND 2.065 INCHES MAXIMUM IN
SHOULDER LENGTH1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY2,CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.400 INCHES MINIMUM AND 0.450 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 OR AMS6322 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
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 BACB30LU4-26X?
BACB30LU4-26X is a SCREW,SHOULDER.
What is the NSN for BACB30LU4-26X?
BACB30LU4-26X is cataloged in the U.S. Government catalog under NSN 5305-01-217-2923. 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.