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Technical Data Sheet
PartsTable / COMPONENT / BACS21X10C
BACS21X10C ✓ 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 diameter: 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN, material: STEEL COMP 302 EJECTOR SPRING, drive_type: SLOTTED, eyelet_length: 0.442 INCHES NOMINAL IN, surface_treatment: PASSIVATE 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 5325-00-839-2277, 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
BACS21X10C
NSN: 5325-00-839-2277
FSC: 5325
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
materialSTEEL COMP 302 EJECTOR SPRING
drive_typeSLOTTED
eyelet_length0.442 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT COUNTERSUNK
material_accommodated_thickness0.321 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
surface_treatment_document_and_classificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
distance_from_engaging_member_to_largest_bearing_surface_of_head0.653 INCHES MINIMUM AND 0.703 INCHES MAXIMUM IN
NSN5325-00-839-2277
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21X10C · 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
•
DRIVE TYPE: SLOTTED
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
•
MATERIAL: STEEL COMP 302 EJECTOR SPRING
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
DRIVE TYPESLOTTED
STUD ASSEMBLY STYLESTUD ASSEMBLY
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
MATERIALSTEEL COMP 302 EJECTOR SPRING
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 305 EYELET
MATERIALSTEEL COMP 302 PIN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
MATERIALSTEEL COMP 302 STUD
MATERIAL ACCOMMODATED THICKNESS0.321 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN
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
BACS21XInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BACS21X10C?
BACS21X10C is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace BACS21X10C?
There are 12 known substitutes for BACS21X10C: BACS21X10, 4002-10, BACS21X10S and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BACS21X10C?
BACS21X10C is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-839-2277. 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