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4075449 — BOLT,EXTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

4075449: BOLT,EXTERNALLY RELIEVED BODY.

The BOLT,EXTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, head_style: HEXAGON EXTENDED WASHER, head_height: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.310 INCHES NOMINAL IN, fastener_length: 1.325 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-320-3946, 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
4075449
NSN: 5306-01-320-3946
FSC: 5306 — Bolts
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
head_styleHEXAGON EXTENDED WASHER
head_height0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class3A A
thread_length0.310 INCHES NOMINAL IN
fastener_length1.325 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
special_featuresSURFACE FINISH OF SHANK AND THREADS IS 32 MICROINCHES
thread_directionRIGHT-HAND
width_between_flats0.497 INCHES NOMINAL IN
end_item_identificationF100PW0229 ENGINE/CORE MOD
nominal_thread_diameter0.250 INCHES IN
extended_washer_diameter0.460 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
NSN5306-01-320-3946
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 4075449 · 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: 0.006 INCHES MINIMUM AND 0.016 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.325 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: PWA 36545-3 MFR REF SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD
•
EXTENDED WASHER DIAMETER: 0.460 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.310 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: PWA 96 MFR REF SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.006 INCHES MINIMUM AND 0.016 INCHES MAXIMUM IN
HEAD HEIGHT0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
FASTENER LENGTH1.325 INCHES MINIMUM AND 1.335 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPWA 36545-3 MFR REF SINGLE TREATMENT RESPONSE BEARING SURFACE OF HEAD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONPWA 36545-3 MFR REF SINGLE TREATMENT RESPONSE THREADS
EXTENDED WASHER DIAMETER0.460 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
THREAD LENGTH0.310 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONPWA 96 MFR REF SINGLE MATERIAL RESPONSE OVERALL
FIRST DIAMETER FROM HEAD0.194 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.250 INCHES 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
5306PL1499247Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4075449?
4075449 is a BOLT,EXTERNALLY RELIEVED BODY.
What parts can replace 4075449?
There is 1 known substitute for 4075449: 5306PL1499247. Substitute compatibility should be verified for your specific system.
What is the NSN for 4075449?
4075449 is cataloged in the U.S. Government catalog under NSN 5306-01-320-3946. 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.