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BACS21ED7AR — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

BACS21ED7AR: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN, drive_type: CROSS RECESS, eyelet_length: 0.332 INCHES MINIMUM AND 0.362 INCHES MAXIMUM IN, stud_head_height: 0.102 INCHES NOMINAL IN, surface_treatment: CADMIUM STUD, stud_assembly_style: STUD ASSEMBLY. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-661-7543, 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
BACS21ED7AR
NSN: 5325-01-661-7543
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
drive_typeCROSS RECESS
eyelet_length0.332 INCHES MINIMUM AND 0.362 INCHES MAXIMUM IN
stud_head_height0.102 INCHES NOMINAL IN
surface_treatmentCADMIUM STUD
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeWASHER
eyelet_outside_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
turnlock_stud_head_styleSTUD HEAD
specification/standard_data81205-BACS21ED MANUFACTURERS STANDARD
material_accommodated_thickness0.820 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
material_document_and_classificationUNS R30003 PER AMS 5833 OR 5834 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR AMS 5525 OR 5731 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE PIN
NSN5325-01-661-7543
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: BACS21ED7AR · 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 DOCUMENT AND CLASSIFICATION: AMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE EYELET
•
EYELET OUTSIDE DIAMETER: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
DRIVE TYPE: CROSS RECESS
•
MATERIAL ACCOMMODATED THICKNESS: 0.820 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: UNS R30003 PER AMS 5833 OR 5834 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR AMS 5525 OR 5731 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE PIN
•
DIAMETER: 0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
•
STUD HEAD HEIGHT: 0.102 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE EYELET
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS-QQ-P-416,TYPE II,CLASS 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE STUD
EYELET OUTSIDE DIAMETER0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
DRIVE TYPECROSS RECESS
MATERIAL ACCOMMODATED THICKNESS0.820 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONUNS R30003 PER AMS 5833 OR 5834 NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR AMS 5525 OR 5731 NATIONAL STD/SPEC 2ND MATERIAL RESPONSE PIN
DIAMETER0.377 INCHES MINIMUM AND 0.384 INCHES MAXIMUM IN
STUD HEAD HEIGHT0.102 INCHES NOMINAL IN
SECURING DEVICE TYPEWASHER
SPECIFICATION/STANDARD DATA81205-BACS21ED MANUFACTURERS STANDARD
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES 1
5325PL1971715Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BACS21ED7AR?
BACS21ED7AR is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace BACS21ED7AR?
There is 1 known substitute for BACS21ED7AR: 5325PL1971715. Substitute compatibility should be verified for your specific system.
What is the NSN for BACS21ED7AR?
BACS21ED7AR is cataloged in the U.S. Government catalog under NSN 5325-01-661-7543. 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.