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Technical Data Sheet
PartsTable / COMPONENT / B40312
B40312 ✓ 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 RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, end_style: 90 DEGREE PARALLEL, ring_style: STRAIGHT GAP, usage_design: EXTERNAL, inside_diameter: 1.469 INCHES NOMINAL IN, major_thickness: 0.063 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-598-1178, 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
B40312
NSN: 5325-00-598-1178
FSC: 5325
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
materialSTEEL
end_style90 DEGREE PARALLEL
ring_styleSTRAIGHT GAP
usage_designEXTERNAL
inside_diameter1.469 INCHES NOMINAL IN
major_thickness0.063 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
outside_diameter1.719 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating46.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationJAN-S-1160,GRADE 2,TYPE B,MATERIAL NO. 5,COMPOSITION NO. 1 MIL SPEC SINGLE MATERIAL RESPONSE
NSN5325-00-598-1178
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B40312 · 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
•
INSIDE DIAMETER: 1.469 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
MATERIAL DOCUMENT AND CLASSIFICATION: JAN-S-1160,GRADE 2,TYPE B,MATERIAL NO. 5,COMPOSITION NO. 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
USAGE DESIGN: EXTERNAL
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MAJOR THICKNESS: 0.063 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.719 INCHES NOMINAL IN
•
END STYLE: 90 DEGREE PARALLEL
TECHNICAL CHARACTERISTICS (FLIS)
INSIDE DIAMETER1.469 INCHES NOMINAL IN
MATERIALSTEEL
MATERIAL DOCUMENT AND CLASSIFICATIONJAN-S-1160,GRADE 2,TYPE B,MATERIAL NO. 5,COMPOSITION NO. 1 MIL SPEC SINGLE MATERIAL RESPONSE
USAGE DESIGNEXTERNAL
CASEHARDENING INDICATORNOT CASEHARDENED
MAJOR THICKNESS0.063 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.719 INCHES NOMINAL IN
END STYLE90 DEGREE PARALLEL
MATERIAL HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
40312Interchangeable
interchangeable cross-reference
interchangeable
18-142Interchangeable
interchangeable cross-reference
interchangeable
00944233000Interchangeable
interchangeable cross-reference
interchangeable
5412MInterchangeable
interchangeable cross-reference
interchangeable
C3641Interchangeable
interchangeable cross-reference
interchangeable
NAS907 TYFSZ3/16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B40312?
B40312 is a RING,RETAINING.
What parts can replace B40312?
There are 9 known substitutes for B40312: 40312, 18-142, 00944233000 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B40312?
B40312 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5325-00-598-1178. 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