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S631 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The TERMINAL,LUG is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.070 INCHES NOMINAL IN, hole_diameter: 0.280 INCHES NOMINAL IN, overall_diameter: 0.625 INCHES NOMINAL IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-562-6560, 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
S631
NSN: 5310-00-562-6560
FSC: 5310
CAGE: ZC672 — CUMMINS SOUTH PACIFIC PTY LTD HEAD OFFICE (AUS)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.070 INCHES NOMINAL IN
hole_diameter0.280 INCHES NOMINAL IN
overall_diameter0.625 INCHES NOMINAL IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-00-562-6560
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: S631 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THICKNESS: 0.070 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.280 INCHES NOMINAL IN
•
OVERALL DIAMETER: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.070 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
PERIPHERAL SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.280 INCHES NOMINAL IN
OVERALL DIAMETER0.625 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
2597-HXInterchangeable
interchangeable cross-reference
interchangeable
128C193H20Interchangeable
interchangeable cross-reference
interchangeable
S631Interchangeable
interchangeable cross-reference
interchangeable
26A01Interchangeable
interchangeable cross-reference
interchangeable
10392446Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is S631?
S631 is a TERMINAL,LUG.
What parts can replace S631?
There are 5 known substitutes for S631: 2597-HX, 128C193H20, S631 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for S631?
S631 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-562-6560. 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