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ST3M4 — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST3M4: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R56400 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, grip_length: 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN, head_height: 0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-283-7455, 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
ST3M4
NSN: 5305-00-283-7455
NIINs: 002837455, 013089250
FSC: 5305 — Screws
CAGE: 0PTK6 — SPS TECHNOLOGIES INC (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 OVERALL
head_styleFLAT COUNTERSUNK UNDERCUT
grip_length0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN
head_height0.044 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter0.376 INCHES MINIMUM AND 0.381 INCHES MAXIMUM IN
thread_length0.381 INCHES MINIMUM AND 0.448 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES GRIP
fastener_length0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle100.0 DEGREES NOMINAL
NSN5305-00-283-7455
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST3M4 · 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 FINISH: 32.0 MICROINCHES THREADS
•
HEAD HEIGHT: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.952 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: NAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OR AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK UNDERCUT
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
HEAD HEIGHT0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
FASTENER LENGTH0.952 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN
THREAD LENGTH0.442 INCHES MINIMUM AND 0.509 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONNAS621 COMP 6AL-4V ASSN STD SINGLE MATERIAL RESPONSE OR AMS4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL V
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT COUNTERSUNK UNDERCUT
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 6
BM33024V4-8UReference document
Same NSN cross-reference
Reference document — Secondary reference
ST3M430V4-8ASSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
110179-4-8ASReference document
Same NSN cross-reference
Reference document — Secondary reference
WC8137-4-8ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
10125107Reference document
Same NSN cross-reference
Reference document — Informative reference only
HT8137-4-8ASSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M4?
ST3M4 is a SCREW,CLOSE TOLERANCE.
What parts can replace ST3M4?
There are 6 known substitutes for ST3M4: BM33024V4-8U, ST3M430V4-8AS, 110179-4-8AS and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M4?
ST3M4 is cataloged in the U.S. Government catalog under NSN 5305-00-283-7455. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.