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Technical Data Sheet
PartsTable / COMPONENT / F540
F540 ✓ 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

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include diameter: 0.562 INCHES NOMINAL IN, material: STEEL OVERALL, nut_style: HEXAGON, drive_type: SLOTTED, nut_height: 0.320 INCHES MINIMUM AND 0.337 INCHES MAXIMUM IN, grip_length: 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-449-3119, 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
F540
NSN: 5325-00-449-3119
FSC: 5325
CAGE: 72794 — SOUTHCO INC (USA)
SPECIFICATIONS
diameter0.562 INCHES NOMINAL IN
materialSTEEL OVERALL
nut_styleHEXAGON
drive_typeSLOTTED
nut_height0.320 INCHES MINIMUM AND 0.337 INCHES MAXIMUM IN
grip_length0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNF
hardness_rating121.0 BRINELL STANDARD MINIMUM
thread_directionRIGHT-HAND
shank_neck_length0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
surface_treatmentCADMIUM AND CHROMATE OVERALL
NSN5325-00-449-3119
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: F540 · 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
•
STUD SHANK MAJOR DIAMETER: 0.307 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
•
DRIVE TYPE: SLOTTED
•
TURNLOCK STUD HEAD STYLE: FLAT COUNTERSUNK
•
SHANK NECK LENGTH: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
•
TURNLOCK STUD SHANK STYLE: STUD SHANK
•
MATERIAL ACCOMMODATED THICKNESS: 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
•
DIAMETER: 0.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
STUD SHANK MAJOR DIAMETER0.307 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
DRIVE TYPESLOTTED
TURNLOCK STUD HEAD STYLEFLAT COUNTERSUNK
SHANK NECK LENGTH0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN
TURNLOCK STUD SHANK STYLESTUD SHANK
MATERIAL ACCOMMODATED THICKNESS0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
DIAMETER0.562 INCHES NOMINAL IN
GRIP LENGTH0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
23A4C3Interchangeable
interchangeable cross-reference
interchangeable
403120020Interchangeable
interchangeable cross-reference
interchangeable
4203Interchangeable
interchangeable cross-reference
interchangeable
F540Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is F540?
F540 is a SCREW,MACHINE.
What parts can replace F540?
There are 4 known substitutes for F540: 23A4C3, 403120020, 4203 and 1 more. Substitute compatibility should be verified for your specific system.
Is F540 still available?
F540 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026