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ST2137-03 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST2137-03: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY OVERALL, head_style: ROUND W/WRENCH FLATS CHAMFERED, head_height: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.730 INCHES MINIMUM AND 0.737 INCHES MAXIMUM IN, thread_length: 0.587 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-377-4124, 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
ST2137-03
NSN: 5306-00-377-4124
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialTITANIUM ALLOY OVERALL
head_styleROUND W/WRENCH FLATS CHAMFERED
head_height0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.730 INCHES MINIMUM AND 0.737 INCHES MAXIMUM IN
thread_length0.587 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.720 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
shoulder_length0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM FIRST SHOULDER IN
special_featuresTWO HOLES DRILLED THROUGH HEAD 0.098 IN. MIN 0.103 IN. MAX DIA,0.520 IN. C TO C BETWEEN BOLT HOLES IN
thread_directionRIGHT-HAND
shoulder_diameter0.248 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN
NSN5306-00-377-4124
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST2137-03 · 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: 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.720 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM FIRST SHOULDER IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PWA 37 FSCM 77445 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER DIAMETER: 0.248 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.587 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN
FASTENER LENGTH0.720 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN
SHOULDER LENGTH0.050 INCHES MINIMUM AND 0.070 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPWA 37 FSCM 77445 MFR REF SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER0.248 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.587 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEROUND W/WRENCH FLATS CHAMFERED
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
5306PL1495276Reference 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 ST2137-03?
ST2137-03 is a BOLT,SHOULDER.
What parts can replace ST2137-03?
There is 1 known substitute for ST2137-03: 5306PL1495276. Substitute compatibility should be verified for your specific system.
What is the NSN for ST2137-03?
ST2137-03 is cataloged in the U.S. Government catalog under NSN 5306-00-377-4124. 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.