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PartsTable / COMPONENT / 40S56-10
40S56-10 ✓ 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: 0.384 INCHES NOMINAL IN, material: STEEL OVERALL, drive_type: SLOTTED, eyelet_length: 0.384 INCHES NOMINAL IN, surface_treatment: NICKEL 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 5325-00-968-7735, 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
40S56-10
NSN: 5325-00-968-7735
FSC: 5325
CAGE: 71286 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV CAMLOC PRODUCTS (USA)
SPECIFICATIONS
diameter0.384 INCHES NOMINAL IN
materialSTEEL OVERALL
drive_typeSLOTTED
eyelet_length0.384 INCHES NOMINAL IN
surface_treatmentNICKEL OVERALL
stud_assembly_styleSTUD ASSEMBLY
eyelet_outside_diameter0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
turnlock_stud_head_styleFLAT COUNTERSUNK
material_accommodated_thickness0.025 INCHES NOMINAL IN
distance_from_engaging_member_to_largest_bearing_surface_of_head0.698 INCHES NOMINAL IN
NSN5325-00-968-7735
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 40S56-10 · 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 OVERALL
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
•
EYELET LENGTH: 0.384 INCHES NOMINAL IN
•
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD: 0.698 INCHES NOMINAL IN
•
STUD ASSEMBLY STYLE: STUD ASSEMBLY
•
EYELET OUTSIDE DIAMETER: 0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
•
DIAMETER: 0.384 INCHES NOMINAL IN
•
DRIVE TYPE: SLOTTED
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
EYELET LENGTH0.384 INCHES NOMINAL IN
DISTANCE FROM ENGAGING MEMBER TO LARGEST BEARING SURFACE OF HEAD0.698 INCHES NOMINAL IN
STUD ASSEMBLY STYLESTUD ASSEMBLY
EYELET OUTSIDE DIAMETER0.341 INCHES MINIMUM AND 0.348 INCHES MAXIMUM IN
DIAMETER0.384 INCHES NOMINAL IN
DRIVE TYPESLOTTED
MATERIAL ACCOMMODATED THICKNESS0.025 INCHES NOMINAL IN
SURFACE TREATMENTNICKEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
5103-50MDInterchangeable
interchangeable cross-reference
interchangeable
5103-50-S-MDInterchangeable
interchangeable cross-reference
interchangeable
3K9042Interchangeable
interchangeable cross-reference
interchangeable
10050644Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40S56-10?
40S56-10 is a STUD ASSEMBLY,TURNLOCK FASTENER.
What parts can replace 40S56-10?
There are 4 known substitutes for 40S56-10: 5103-50MD, 5103-50-S-MD, 3K9042 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40S56-10?
40S56-10 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-968-7735. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026