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PartsTable / COMPONENT / 388D4
388D4 ✓ 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 SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 3135 OVERALL, head_style: HEADLESS (SETSCREW), point_style: FLAT, point_length: 0.375 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 1.312 INCHES MAXIMUM 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 5305-00-517-4245, 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
388D4
NSN: 5305-00-517-4245
FSC: 5305
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
materialSTEEL COMP 3135 OVERALL
head_styleHEADLESS (SETSCREW)
point_styleFLAT
point_length0.375 INCHES NOMINAL IN
thread_class2A A
thread_length1.312 INCHES MAXIMUM IN
point_diameter0.510 INCHES NOMINAL IN
fastener_length1.312 INCHES NOMINAL IN
hardness_rating27.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentPHOSPHATE OVERALL
width_across_flats0.312 INCHES NOMINAL IN
NSN5305-00-517-4245
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 388D4 · 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
•
NOMINAL THREAD DIAMETER: 0.625 INCHES IN
•
THREAD LENGTH: 1.312 INCHES MAXIMUM IN
•
SURFACE TREATMENT: PHOSPHATE OVERALL
•
MATERIAL: STEEL COMP 3135 OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
POINT CHAMFER ANGLE: 90.0 DEGREES NOMINAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD DIAMETER0.625 INCHES IN
THREAD LENGTH1.312 INCHES MAXIMUM IN
SURFACE TREATMENTPHOSPHATE OVERALL
MATERIALSTEEL COMP 3135 OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
POINT CHAMFER ANGLE90.0 DEGREES NOMINAL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
WIDTH ACROSS FLATS0.312 INCHES NOMINAL IN
FASTENER LENGTH1.312 INCHES NOMINAL IN
INTERNAL DRIVE STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
0913888Interchangeable
interchangeable cross-reference
interchangeable
26-X-50Interchangeable
interchangeable cross-reference
interchangeable
400X8Interchangeable
interchangeable cross-reference
interchangeable
SAE J512 10-8 040302BInterchangeable
interchangeable cross-reference
interchangeable
SAE-J512Interchangeable
interchangeable cross-reference
interchangeable
J512Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 388D4?
388D4 is a SETSCREW.
What parts can replace 388D4?
There are 25 known substitutes for 388D4: 0913888, 26-X-50, 400X8 and 22 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 388D4?
388D4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-517-4245. 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