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43-S-4371-190 — Technical Data Sheet

✓ 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 COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 8640 OVERALL, head_style: FLAT CHAMFER, head_height: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.863 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN, thread_length: 2.000 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 5305-00-271-5073, 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-4371-190
NSN: 5305-00-271-5073
FSC: 5305
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 8640 OVERALL
head_styleFLAT CHAMFER
head_height0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.863 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
thread_length2.000 INCHES NOMINAL IN
fastener_length2.000 INCHES NOMINAL IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
width_across_flats0.500 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
internal_drive_styleHEXAGON
NSN5305-00-271-5073
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 43-S-4371-190 · 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 DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
WIDTH ACROSS FLATS: 0.500 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 8640 OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 11 STYLE
•
SURFACE TREATMENT: ZINC OVERALL
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
HEAD HEIGHT: 0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL
WIDTH ACROSS FLATS0.500 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
MATERIALSTEEL COMP 4135 OR STEEL COMP 4137 OR STEEL COMP 8640 OVERALL
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 11 STYLE
SURFACE TREATMENTZINC OVERALL
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
THREAD DIRECTIONRIGHT-HAND
HEAD HEIGHT0.616 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD LENGTH2.000 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
185416PC16Interchangeable
interchangeable cross-reference
interchangeable
185449PC16Interchangeable
interchangeable cross-reference
interchangeable
166345PC16Interchangeable
interchangeable cross-reference
interchangeable
FFS86TYPE1STYLE11Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 43-S-4371-190?
43-S-4371-190 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 43-S-4371-190?
There are 4 known substitutes for 43-S-4371-190: 185416PC16, 185449PC16, 166345PC16 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 43-S-4371-190?
43-S-4371-190 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-271-5073. This indicates validated use in U.S. government and defense supply chains.
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Last verified: August 2026