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PartsTable / COMPONENT / 43-S-4374-1640
43-S-4374-1640 ✓ 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,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.262 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, thread_length: 0.500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-273-5557, 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
43-S-4374-1640
NSN: 5305-00-273-5557
FSC: 5305
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleFLAT CHAMFER
head_height0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.262 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
thread_length0.500 INCHES NOMINAL IN
fastener_length0.500 INCHES NOMINAL IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL
width_across_flats0.140 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-273-5557
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 43-S-4374-1640 · 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: CADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD QUANTITY PER INCH: 32
•
MATERIAL: STEEL OVERALL
•
MINIMUM YIELD STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
•
HEAD STYLE: FLAT CHAMFER
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTCADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH32
MATERIALSTEEL OVERALL
MINIMUM YIELD STRENGTH130000 POUNDS PER SQUARE INCH LBS
HEAD STYLEFLAT CHAMFER
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.164 INCHES IN
THREAD LENGTH0.500 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
13860-46Interchangeable
interchangeable cross-reference
interchangeable
FFS86TYPE6Interchangeable
interchangeable cross-reference
interchangeable
12F1007-293Interchangeable
interchangeable cross-reference
interchangeable
12Z1007-293Interchangeable
interchangeable cross-reference
interchangeable
12Z1007-217Interchangeable
interchangeable cross-reference
interchangeable
MILS933TYPECInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 43-S-4374-1640?
43-S-4374-1640 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 43-S-4374-1640?
There are 19 known substitutes for 43-S-4374-1640: 13860-46, FFS86TYPE6, 12F1007-293 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 43-S-4374-1640?
43-S-4374-1640 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-273-5557. This indicates validated use in U.S. government and defense supply chains.
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PartsTable Design LLC · partstable.com
Last verified: July 2026