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Technical Data Sheet
PartsTable / MRO / 3311A
3311A ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 3311A is a the manufacturer industrial component. Key specifications include end_item_identification: WASP CLASS LHD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-254-9662, 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
MRO→ MRO_GENERAL→ 3311A
NSN: 5306-00-254-9662
FSC: 5306
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
end_item_identificationWASP CLASS LHD
NSN5306-00-254-9662
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 3311A · 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
•
WIDTH BETWEEN FLATS: 1.125 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
MINIMUM YIELD STRENGTH: 145000 POUNDS PER SQUARE INCH LBS
•
MATERIAL: STEEL OVERALL
•
HARDNESS RATING: 30.0 ROCKWELL C NOMINAL OVERALL
•
FEATURES PROVIDED: FINISHED HEAD
•
THREAD SERIES DESIGNATOR: UNF
•
HEAD HEIGHT: 0.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH BETWEEN FLATS1.125 INCHES NOMINAL IN
THREAD CLASS2A A
MINIMUM YIELD STRENGTH145000 POUNDS PER SQUARE INCH LBS
MATERIALSTEEL OVERALL
HARDNESS RATING30.0 ROCKWELL C NOMINAL OVERALL
FEATURES PROVIDEDFINISHED HEAD
THREAD SERIES DESIGNATORUNF
HEAD HEIGHT0.562 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.750 INCHES IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
55635Interchangeable
interchangeable cross-reference
interchangeable
3311AInterchangeable
interchangeable cross-reference
interchangeable
HP3311AInterchangeable
interchangeable cross-reference
interchangeable
33-11PInterchangeable
interchangeable cross-reference
interchangeable
003311AInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3311A?
3311A is a 3311A. It is classified as a MRO (MRO_GENERAL).
What parts can replace 3311A?
There are 5 known substitutes for 3311A: 55635, 3311A, HP3311A and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3311A?
3311A is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-254-9662. 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