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Technical Data Sheet
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ST2138-04 — BOLT,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST2138-04: BOLT,MACHINE.

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY OVERALL, head_style: ROUND W/WRENCH FLATS CHAMFERED, grip_length: 0.090 INCHES MINIMUM IN, head_height: 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.730 INCHES MINIMUM AND 0.737 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-377-4171, 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
ST2138-04
NSN: 5306-00-377-4171
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialTITANIUM ALLOY OVERALL
head_styleROUND W/WRENCH FLATS CHAMFERED
grip_length0.090 INCHES MINIMUM IN
head_height0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.730 INCHES MINIMUM AND 0.737 INCHES MAXIMUM IN
thread_length1.134 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
surface_finish63.0 MICROINCHES GRIP
fastener_length1.315 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
special_featuresFORM FIT FUNCTION
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
NSN5306-00-377-4171
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST2138-04 · 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: 63.0 MICROINCHES GRIP
•
HEAD HEIGHT: 0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.315 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PWA 37,FSCM 77445 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 1.134 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
•
CRITICALITY CODE JUSTIFICATION: FEAT
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE FINISH63.0 MICROINCHES GRIP
SURFACE FINISH63.0 MICROINCHES HEAD
HEAD HEIGHT0.090 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
FASTENER LENGTH1.315 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPWA 37,FSCM 77445 MFR REF SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH1.134 INCHES MINIMUM AND 1.245 INCHES MAXIMUM IN
CRITICALITY CODE JUSTIFICATIONFEAT
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 1
5306PL1495291Reference document
Same NSN cross-reference
Reference document — Informative reference only
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 ST2138-04?
ST2138-04 is a BOLT,MACHINE.
What parts can replace ST2138-04?
There is 1 known substitute for ST2138-04: 5306PL1495291. Substitute compatibility should be verified for your specific system.
What is the NSN for ST2138-04?
ST2138-04 is cataloged in the U.S. Government catalog under NSN 5306-00-377-4171. 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.