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Technical Data Sheet
PartsTable / COMPONENT / 508 3/8
508 3/8 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The 508 3/8 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-685-7660, 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
508 3/8
NSN: 5305-00-685-7660
FSC: 5305
CAGE: 00781 — CESSNA AIRCRAFT CO ARC AVIONICS DIV (USA)
SPECIFICATIONS
Part Number508 3/8
NSN5305-00-685-7660
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 508 3/8 · 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
•
INTERNAL DRIVE STYLE: SLOT
•
PRIMARY WASHER STYLE: FLAT INTERNAL TEETH
•
HEAD DIAMETER: 0.335 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
SURFACE TREATMENT: PASSIVATE PRIMARY WASHER
•
NOMINAL THREAD DIAMETER: 0.164 INCHES IN
•
HEAD HEIGHT: 0.092 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS (FLIS)
INTERNAL DRIVE STYLESLOT
PRIMARY WASHER STYLEFLAT INTERNAL TEETH
HEAD DIAMETER0.335 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
SURFACE TREATMENTPASSIVATE PRIMARY WASHER
NOMINAL THREAD DIAMETER0.164 INCHES IN
HEAD HEIGHT0.092 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL COMP 410 PRIMARY WASHER
PRIMARY WASHER MATERIAL THICKNESS0.042 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
50838Interchangeable
interchangeable cross-reference
interchangeable
JSFQ05Interchangeable
interchangeable cross-reference
interchangeable
JSFQ05-12Interchangeable
interchangeable cross-reference
interchangeable
1690710Interchangeable
interchangeable cross-reference
interchangeable
508-00240Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 508 3/8?
508 3/8 is a 508 3/8.
What parts can replace 508 3/8?
There are 5 known substitutes for 508 3/8: 50838, JSFQ05, JSFQ05-12 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 508 3/8?
508 3/8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-685-7660. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026