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Technical Data Sheet
PartsTable / COMPONENT / 30155-2-4
30155-2-4 ✓ 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 4037 OVERALL, head_style: BUTTON, head_height: 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN, spline_width: 0.010 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.154 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-838-9800, 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
30155-2-4
NSN: 5305-00-838-9800
FSC: 5305
CAGE: 08664 — BRISTOL BABCOCK INC INSTRUMENTS-SYSTEMS DIV SUB OF BABCOCK INTL INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4037 OVERALL
head_styleBUTTON
head_height0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
spline_width0.010 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.154 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
thread_length0.250 INCHES MINIMUM IN
fastener_length0.250 INCHES NOMINAL IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
internal_drive_styleSIX SPLINE
spline_major_diameter0.049 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
NSN5305-00-838-9800
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 30155-2-4 · 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
•
HEAD HEIGHT: 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
•
SPLINE MINOR DIAMETER: 0.040 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
THREAD QUANTITY PER INCH: 56
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD LENGTH: 0.250 INCHES MINIMUM IN
•
NOMINAL THREAD DIAMETER: 0.086 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
SPLINE MINOR DIAMETER0.040 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
THREAD QUANTITY PER INCH56
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.250 INCHES MINIMUM IN
NOMINAL THREAD DIAMETER0.086 INCHES IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL COMP 4037 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
88-24550Interchangeable
interchangeable cross-reference
interchangeable
56375030Interchangeable
interchangeable cross-reference
interchangeable
33.187Interchangeable
interchangeable cross-reference
interchangeable
M141Interchangeable
interchangeable cross-reference
interchangeable
2564Interchangeable
interchangeable cross-reference
interchangeable
1288Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 30155-2-4?
30155-2-4 is a SCREW,CAP,SOCKET HEAD.
What parts can replace 30155-2-4?
There are 20 known substitutes for 30155-2-4: 88-24550, 56375030, 33.187 and 17 more. Substitute compatibility should be verified for your specific system.
Is 30155-2-4 still available?
30155-2-4 is currently cancelled.
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Last verified: July 2026