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Technical Data Sheet
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640840 — Technical Data Sheet

✓ 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, ring_style: WAVE, usage_design: EXTERNAL, end_play_takeup: 0.188 INCHES MAXIMUM IN, inside_diameter: 1.031 INCHES NOMINAL IN, major_thickness: 0.020 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 5325-00-351-4715, 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
640840
NSN: 5325-00-351-4715
FSC: 5325
CAGE: 12436 — BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. DIV BAE SYSTEMS INFORMATION & ELECTRONIC SYSTEMS INTEGRATION INC (USA)
SPECIFICATIONS
materialSTEEL
ring_styleWAVE
usage_designEXTERNAL
end_play_takeup0.188 INCHES MAXIMUM IN
inside_diameter1.031 INCHES NOMINAL IN
major_thickness0.020 INCHES NOMINAL IN
outside_diameter1.231 INCHES NOMINAL IN
surface_treatmentCADMIUM
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating47.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
cross-sectional_shape_styleRECTANGULAR
NSN5325-00-351-4715
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 640840 · 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: 1.031 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
END PLAY TAKEUP: 0.188 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM
•
MATERIAL: STEEL
•
USAGE DESIGN: EXTERNAL
•
MAJOR THICKNESS: 0.020 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS
INSIDE DIAMETER1.031 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
END PLAY TAKEUP0.188 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM
MATERIALSTEEL
USAGE DESIGNEXTERNAL
MAJOR THICKNESS0.020 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
RING STYLEWAVE
OUTSIDE DIAMETER1.231 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
MIL-PRF-1/1112InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
8493InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MILE1G1112D8493InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
20969InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
E5-45-846InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
11976InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 640840?
640840 is a RING,RETAINING.
What parts can replace 640840?
There are 15 known substitutes for 640840: MIL-PRF-1/1112, 8493, MILE1G1112D8493 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 640840?
640840 is cataloged in the Federal Logistics Information System under NSN 5325-00-351-4715. 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: September 2026