PartsTable
Technical Data Sheet
Download PDF

31368 — SEAT,HELICAL COMPRESSION SPRING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

31368: SEAT,HELICAL COMPRESSION SPRING.

SEAT,HELICAL COMPRESSION SPRING. Key specifications include special_features: PART OF VALVE 4820011879232; USEDON B-1B AIRCRAFT, fsc_application_data: AIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-168-0155, 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
31368
NSN: 5306-00-168-0155
NIINs: 001680155, 012857914
FSC: 5306 — Bolts
CAGE: 32537 — JOY GLOBAL UNDERGROUND MINING LLC (USA)
SPECIFICATIONS
special_featuresPART OF VALVE 4820011879232; USEDON B-1B AIRCRAFT
fsc_application_dataAIRCRAFT HYDRAULIC,VACUUM,DEICING SYSTEMS
NSN5306-00-168-0155
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 31368 · 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: 0.300 INCHES NOMINAL IN
•
FASTENER LENGTH: 2.750 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO FLAT: 0.266 INCHES NOMINAL IN
•
THREAD LENGTH: 0.875 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
•
HEAD STYLE: DEE CHAMFER
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.300 INCHES NOMINAL IN
FASTENER LENGTH2.750 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO FLAT0.266 INCHES NOMINAL IN
THREAD LENGTH0.875 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEDEE CHAMFER
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2A A
THREAD QUANTITY PER INCH20
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 4
31368WReference document
Same NSN cross-reference
Reference document — Secondary reference
W6703ITEM11Reference document
Same NSN cross-reference
Reference document — Secondary reference
W6703ITEM41Reference document
Same NSN cross-reference
Reference document — Secondary reference
W67031TEM11Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
Ready to buy 31368?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 31368?
31368 is a SEAT,HELICAL COMPRESSION SPRING.
What parts can replace 31368?
There are 4 known substitutes for 31368: 31368W, W6703ITEM11, W6703ITEM41 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31368?
31368 is cataloged in the U.S. Government catalog under NSN 5306-00-168-0155. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 31368

✓ 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.