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ST2520-09 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

ST2520-09: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: TITANIUM ALLOY UNS R56400 OVERALL, head_style: DOUBLE HEXAGON W/HOLE, head_height: 0.373 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.820 INCHES MINIMUM AND 0.923 INCHES MAXIMUM IN, fastener_length: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-315-4889, 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
ST2520-09
NSN: 5306-01-315-4889
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialTITANIUM ALLOY UNS R56400 OVERALL
head_styleDOUBLE HEXAGON W/HOLE
head_height0.373 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
thread_class3A A
thread_length0.820 INCHES MINIMUM AND 0.923 INCHES MAXIMUM IN
fastener_length0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
special_featuresSURFACE ON GRIP AND BEARING SURFACE OF HEAD 32 MICRINCHES; THREADS AND WASHER FACE COATED PWA 550-3 AGEC 77445
thread_directionRIGHT-HAND
width_between_flats0.4375 INCHES NOMINAL IN
nominal_thread_diameter0.375 INCHES IN
extended_washer_diameter0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN
first_diameter_from_head0.343 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
NSN5306-01-315-4889
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: ST2520-09 · 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
•
EXTENDED WASHER THICKNESS: 0.090 INCHES MINIMUM IN
•
HEAD HEIGHT: 0.373 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.820 INCHES MINIMUM AND 0.923 INCHES MAXIMUM IN
•
FIRST DIAMETER FROM HEAD: 0.343 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.375 INCHES IN
•
HEAD STYLE: DOUBLE HEXAGON W/HOLE
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.090 INCHES MINIMUM IN
HEAD HEIGHT0.373 INCHES MINIMUM AND 0.393 INCHES MAXIMUM IN
FASTENER LENGTH0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN
THREAD LENGTH0.820 INCHES MINIMUM AND 0.923 INCHES MAXIMUM IN
FIRST DIAMETER FROM HEAD0.343 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.375 INCHES IN
HEAD STYLEDOUBLE HEXAGON W/HOLE
THREAD DIRECTIONRIGHT-HAND
WIDTH BETWEEN FLATS0.4375 INCHES NOMINAL IN
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
5306PL1499158Reference 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 ST2520-09?
ST2520-09 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace ST2520-09?
There is 1 known substitute for ST2520-09: 5306PL1499158. Substitute compatibility should be verified for your specific system.
What is the NSN for ST2520-09?
ST2520-09 is cataloged in the U.S. Government catalog under NSN 5306-01-315-4889. 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.