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28S1-6 — STUD ASSEMBLY,TURNLOCK FASTENER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

28S1-6: STUD ASSEMBLY,TURNLOCK FASTENER.

STUD ASSEMBLY,TURNLOCK FASTENER. Key specifications include diameter: 0.489 INCHES MINIMUM AND 0.511 INCHES MAXIMUM IN, material: STEEL OVERALL, drive_type: SLOTTED, stud_diameter: 0.124 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, stud_head_height: 0.174 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN, surface_treatment: CADMIUM AND CHROMATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-620-6478, 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
28S1-6
NSN: 5325-00-620-6478
FSC: 5325 — Fastening Devices
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.489 INCHES MINIMUM AND 0.511 INCHES MAXIMUM IN
materialSTEEL OVERALL
drive_typeSLOTTED
stud_diameter0.124 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
stud_head_height0.174 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
stud_assembly_styleSTUD ASSEMBLY
securing_device_typeWASHER
eyelet_outside_diameter0.519 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT FILLISTER
material_accommodated_thickness0.180 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
NSN5325-00-620-6478
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 28S1-6 · 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
•
EYELET OUTSIDE DIAMETER: 0.519 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
MATERIAL ACCOMMODATED THICKNESS: 0.180 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
•
DIAMETER: 0.489 INCHES MINIMUM AND 0.511 INCHES MAXIMUM IN
•
STUD HEAD HEIGHT: 0.174 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN
•
SECURING DEVICE TYPE: WASHER
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
•
TURNLOCK STUD HEAD STYLE: FLAT FILLISTER
TECHNICAL CHARACTERISTICS
EYELET OUTSIDE DIAMETER0.519 INCHES MINIMUM AND 0.531 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.180 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
DIAMETER0.489 INCHES MINIMUM AND 0.511 INCHES MAXIMUM IN
STUD HEAD HEIGHT0.174 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN
SECURING DEVICE TYPEWASHER
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
TURNLOCK STUD HEAD STYLEFLAT FILLISTER
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL OVERALL
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
100-33226-5Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 28S1-6?
28S1-6 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 28S1-6?
There is 1 known substitute for 28S1-6: 100-33226-5. Substitute compatibility should be verified for your specific system.
What is the NSN for 28S1-6?
28S1-6 is cataloged in the U.S. Government catalog under NSN 5325-00-620-6478. 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.