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721602-28 — STUD,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

721602-28: STUD,TURNLOCK FASTENER.

The STUD,TURNLOCK FASTENER is a the manufacturer industrial component. Key specifications include diameter: 0.360 INCHES MINIMUM IN, material: STEEL COMP 303 OR STEEL COMP 303SE OVERALL, drive_type: SOCKET, grip_length: 0.438 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN, extension_length: 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-243-5070, 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
721602-28
NSN: 5325-00-243-5070
FSC: 5325 — Fastening Devices
CAGE: 05869 — RAYTHEON COMPANY DIV RMD STRATEGIC (USA)
SPECIFICATIONS
diameter0.360 INCHES MINIMUM IN
materialSTEEL COMP 303 OR STEEL COMP 303SE OVERALL
drive_typeSOCKET
grip_length0.438 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
extension_length0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
securing_device_typeRING
turnlock_stud_head_styleFLAT COUNTERSUNK
stud_shank_major_diameter0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
turnlock_stud_shank_styleSTUD SHANK
material_accommodated_thickness0.438 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
material_document_and_classificationASTM A581 ASSN STD ALL MATERIAL RESPONSES OR AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5325-00-243-5070
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 721602-28 · 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: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
DRIVE TYPE: SOCKET
•
MATERIAL ACCOMMODATED THICKNESS: 0.438 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
EXTENSION LENGTH: 0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A581 ASSN STD ALL MATERIAL RESPONSES OR AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL
•
DIAMETER: 0.360 INCHES MINIMUM IN
•
SECURING DEVICE TYPE: RING
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
DRIVE TYPESOCKET
MATERIAL ACCOMMODATED THICKNESS0.438 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
EXTENSION LENGTH0.175 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A581 ASSN STD ALL MATERIAL RESPONSES OR AMS 5640 ASSN STD ALL MATERIAL RESPONSES OVERALL
DIAMETER0.360 INCHES MINIMUM IN
SECURING DEVICE TYPERING
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
STUD SHANK MAJOR DIAMETER0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN
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 2
11438454-4Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
CA1820-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 721602-28?
721602-28 is a STUD,TURNLOCK FASTENER.
What parts can replace 721602-28?
There are 2 known substitutes for 721602-28: 11438454-4, CA1820-4. Substitute compatibility should be verified for your specific system.
What is the NSN for 721602-28?
721602-28 is cataloged in the U.S. Government catalog under NSN 5325-00-243-5070. 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.