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PartsTable / COMPONENT / 2D3-978 ITEM 74
2D3-978 ITEM 74 ✓ 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: 5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN, outside_diameter: 6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.165 INCHES NOMINAL IN, external_key_quantity: 19. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-977-8854, 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
2D3-978 ITEM 74
NSN: 5310-00-977-8854
FSC: 5310
CAGE: 34712 — LAKE SHORE SYSTEMS, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN
outside_diameter6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.165 INCHES NOMINAL IN
external_key_quantity19
external_prebent_key_width0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
internal_prebent_key_width0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
internal_prebent_key_length0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
overall_distance_including_keys7.437 INCHES NOMINAL IN
NSN5310-00-977-8854
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2D3-978 ITEM 74 · 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
•
MATERIAL THICKNESS: 0.165 INCHES NOMINAL IN
•
INTERNAL PREBENT KEY WIDTH: 0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 19
•
OUTSIDE DIAMETER: 6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
•
HOLE DIAMETER: 5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY WIDTH: 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORKEY
MATERIALSTEEL OVERALL
MATERIAL THICKNESS0.165 INCHES NOMINAL IN
INTERNAL PREBENT KEY WIDTH0.500 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY19
OUTSIDE DIAMETER6.531 INCHES MINIMUM AND 6.576 INCHES MAXIMUM IN
HOLE DIAMETER5.582 INCHES MINIMUM AND 5.617 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM IN
INTERNAL PREBENT KEY LENGTH0.250 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS7.437 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
W128Interchangeable
interchangeable cross-reference
interchangeable
10-1160-22-05-0Interchangeable
interchangeable cross-reference
interchangeable
MILW13075Interchangeable
interchangeable cross-reference
interchangeable
11000Interchangeable
interchangeable cross-reference
interchangeable
4L1000Interchangeable
interchangeable cross-reference
interchangeable
FA100Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2D3-978 ITEM 74?
2D3-978 ITEM 74 is a WASHER,KEY.
What parts can replace 2D3-978 ITEM 74?
There are 10 known substitutes for 2D3-978 ITEM 74: W128, 10-1160-22-05-0, MILW13075 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2D3-978 ITEM 74?
2D3-978 ITEM 74 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-977-8854. This indicates validated use in U.S. government and defense supply chains.
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Last verified: July 2026