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Technical Data Sheet
PartsTable / COMPONENT / 3663991
3663991 ✓ 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 WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.781 INCHES NOMINAL IN, outside_diameter: 1.750 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.118 INCHES NOMINAL IN, internal_straight_key_width: 0.188 INCHES NOMINAL 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 5310-00-457-8140, 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
3663991
NSN: 5310-00-457-8140
FSC: 5310
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.781 INCHES NOMINAL IN
outside_diameter1.750 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.118 INCHES NOMINAL IN
internal_key_quantity1
internal_straight_key_width0.188 INCHES NOMINAL IN
distance_from_centerline_to_top_of_internal_key0.319 INCHES NOMINAL IN
NSN5310-00-457-8140
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 3663991 · 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
•
STYLE DESIGNATOR: KEY
•
MATERIAL: STEEL OVERALL
•
INTERNAL STRAIGHT KEY WIDTH: 0.188 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.319 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.118 INCHES NOMINAL IN
•
INTERNAL KEY QUANTITY: 1
•
OUTSIDE DIAMETER: 1.750 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.781 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORKEY
MATERIALSTEEL OVERALL
INTERNAL STRAIGHT KEY WIDTH0.188 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.319 INCHES NOMINAL IN
MATERIAL THICKNESS0.118 INCHES NOMINAL IN
INTERNAL KEY QUANTITY1
OUTSIDE DIAMETER1.750 INCHES NOMINAL IN
HOLE DIAMETER0.781 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
326197Interchangeable
interchangeable cross-reference
interchangeable
377133Interchangeable
interchangeable cross-reference
interchangeable
326195Interchangeable
interchangeable cross-reference
interchangeable
326196Interchangeable
Same NIIN cross-reference
interchangeable
A24439Interchangeable
Same NIIN cross-reference
interchangeable
596566Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3663991?
3663991 is a WASHER,KEY.
What parts can replace 3663991?
There are 6 known substitutes for 3663991: 326197, 377133, 326195 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3663991?
3663991 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-457-8140. 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