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Technical Data Sheet
PartsTable / COMPONENT / BACS21Y9W
BACS21Y9W ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include material: STEEL OVERALL, head_length: 0.720 INCHES NOMINAL IN, eyelet_length: 0.322 INCHES NOMINAL IN, stud_head_height: 0.440 INCHES NOMINAL IN, surface_treatment: CADMIUM AND CHROMATE OVERALL, stud_assembly_style: STUD ASSEMBLY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-514-6490, 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
BACS21Y9W
NSN: 5325-00-514-6490
FSC: 5325
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_length0.720 INCHES NOMINAL IN
eyelet_length0.322 INCHES NOMINAL IN
stud_head_height0.440 INCHES NOMINAL IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeSPRING
eyelet_outside_diameter0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
turnlock_stud_head_styleFILLISTER WING
material_accommodated_thickness0.240 INCHES MINIMUM AND 0.299 INCHES MAXIMUM IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.782 INCHES MINIMUM AND 0.797 INCHES MAXIMUM IN
NSN5325-00-514-6490
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21Y9W · 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
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
MATERIAL: STEEL OVERALL
•
TURNLOCK STUD HEAD STYLE: FILLISTER WING
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.782 INCHES MINIMUM AND 0.797 INCHES MAXIMUM IN
•
EYELET LENGTH: 0.322 INCHES NOMINAL IN
•
SECURING DEVICE TYPE: SPRING
•
STUD HEAD HEIGHT: 0.440 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL OVERALL
TURNLOCK STUD HEAD STYLEFILLISTER WING
STUD ASSEMBLY STYLESTUD ASSEMBLY
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.782 INCHES MINIMUM AND 0.797 INCHES MAXIMUM IN
EYELET LENGTH0.322 INCHES NOMINAL IN
SECURING DEVICE TYPESPRING
STUD HEAD HEIGHT0.440 INCHES NOMINAL IN
MATERIAL ACCOMMODATED THICKNESS0.240 INCHES MINIMUM AND 0.299 INCHES MAXIMUM IN
EYELET OUTSIDE DIAMETER0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
212S29Interchangeable
interchangeable cross-reference
interchangeable
3085656Interchangeable
interchangeable cross-reference
interchangeable
040-231Interchangeable
interchangeable cross-reference
interchangeable
MORP-ODInterchangeable
interchangeable cross-reference
interchangeable
941688014110Interchangeable
interchangeable cross-reference
interchangeable
2600-9WInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACS21Y9W?
BACS21Y9W is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace BACS21Y9W?
There are 7 known substitutes for BACS21Y9W: 212S29, 3085656, 040-231 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BACS21Y9W?
BACS21Y9W is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-514-6490. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026