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Technical Data Sheet
PartsTable / COMPONENT / BACS21ED21W
BACS21ED21W ✓ 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 COMP 1009 HEAD, head_length: 0.480 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN, eyelet_length: 0.220 INCHES NOMINAL IN, surface_treatment: CADMIUM AND CHROMATE OVERALL, stud_assembly_style: STUD ASSEMBLY, eyelet_outside_diameter: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-936-0089, 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
BACS21ED21W
NSN: 5325-00-936-0089
FSC: 5325
CAGE: 81205 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 1009 HEAD
head_length0.480 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
eyelet_length0.220 INCHES NOMINAL IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT COUNTERSUNK WING
material_accommodated_thickness0.651 INCHES MINIMUM AND 0.680 INCHES MAXIMUM IN
material_document_and_classificationQQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE EJECTOR SPRING
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
distance_from_engaging_member_to_largest_bearing_surface_of_head1.033 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN
NSN5325-00-936-0089
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21ED21W · 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
•
MATERIAL: STEEL COMP 1009 OR STEEL COMP 1050 OR STEEL COMP 1112 EYELET
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE PIN
•
SURFACE TREATMENT: CADMIUM AND CHROMATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
MATERIAL ACCOMMODATED THICKNESS: 0.651 INCHES MINIMUM AND 0.680 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL COMP 1009 OR STEEL COMP 1050 OR STEEL COMP 1112 EYELET
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE PIN
MATERIALSTEEL PIN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
STUD ASSEMBLY STYLESTUD ASSEMBLY
MATERIALSTEEL COMP 1009 HEAD
MATERIAL ACCOMMODATED THICKNESS0.651 INCHES MINIMUM AND 0.680 INCHES MAXIMUM IN
EYELET OUTSIDE DIAMETER0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
MATERIALSTEEL EJECTOR SPRING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
BACS21X10Interchangeable
interchangeable cross-reference
interchangeable
4002-10Interchangeable
interchangeable cross-reference
interchangeable
BACS21X10SInterchangeable
interchangeable cross-reference
interchangeable
BACS21X11SInterchangeable
interchangeable cross-reference
interchangeable
4002-11SInterchangeable
interchangeable cross-reference
interchangeable
4002-10SInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACS21ED21W?
BACS21ED21W is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace BACS21ED21W?
There are 12 known substitutes for BACS21ED21W: BACS21X10, 4002-10, BACS21X10S and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BACS21ED21W?
BACS21ED21W is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-936-0089. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026