PartsTable
Technical Data Sheet
Download PDF

BACS12HW3AU8 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACS12HW3AU8: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: FLAT CHAMFER, grip_length: 0.490 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN, head_height: 0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-521-5145, 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
BACS12HW3AU8
NSN: 5305-01-521-5145
FSC: 5305 — Screws
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
head_styleFLAT CHAMFER
grip_length0.490 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
head_height0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN
thread_length0.276 INCHES MINIMUM IN
fastener_length0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN OVERALL
special_featuresPER ASME B46.1. "D" DIAMETER UNDERSIDE OF HEAD, ROOT OF THREADS AND THREAD FLANKS 32 MICROINCHES RA. ALL OTHER SURFACES, 125 MICROINCHES RA.
thread_directionRIGHT-HAND
NSN5305-01-521-5145
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS12HW3AU8 · 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
•
SPLINE MINOR DIAMETER: 0.1105 INCHES MINIMUM AND 0.1205 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS-QQ-P-35, TYPE II OR VIII ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.276 INCHES MINIMUM IN
•
CRITICALITY CODE JUSTIFICATION: AGAV
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5731 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5853 A286 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SPLINE MAJOR DIAMETER: 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SPLINE MINOR DIAMETER0.1105 INCHES MINIMUM AND 0.1205 INCHES MAXIMUM IN
HEAD HEIGHT0.122 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN
FASTENER LENGTH0.761 INCHES MINIMUM AND 0.791 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS-QQ-P-35, TYPE II OR VIII ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.276 INCHES MINIMUM IN
CRITICALITY CODE JUSTIFICATIONAGAV
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5731 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5732 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 A286 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5853 A286 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SPLINE MAJOR DIAMETER0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy BACS12HW3AU8?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is BACS12HW3AU8?
BACS12HW3AU8 is a SCREW,CLOSE TOLERANCE.
What is the NSN for BACS12HW3AU8?
BACS12HW3AU8 is cataloged in the U.S. Government catalog under NSN 5305-01-521-5145. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — BACS12HW3AU8

✓ 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.