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20590-174 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

20590-174: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 0.472 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN, outside_diameter: 0.719 INCHES NOMINAL IN, style_designator: KEY, material_thickness: 0.030 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN, external_prebent_key_width: 0.109 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-859-3818, 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
20590-174
NSN: 5310-00-859-3818
FSC: 5310 — Nuts and Washers
CAGE: 04009 — COOPER INDUSTRIES INC COOPER DISTRIBUTION EQUIPMENT DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter0.472 INCHES MINIMUM AND 0.474 INCHES MAXIMUM IN
outside_diameter0.719 INCHES NOMINAL IN
style_designatorKEY
material_thickness0.030 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
external_prebent_key_width0.109 INCHES NOMINAL IN
external_prebent_key_length0.050 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
internal_straight_key_width0.057 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
overall_distance_including_keys0.750 INCHES NOMINAL IN
distance_from_centerline_to_top_of_internal_key0.200 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN
distance_from_centerline_to_inside_of_prebent_key0.360 INCHES NOMINAL IN
NSN5310-00-859-3818
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 20590-174 · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.057 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.200 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.360 INCHES NOMINAL IN
•
EXTERNAL PREBENT KEY LENGTH: 0.050 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 0.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 0.719 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.030 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.057 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.200 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.360 INCHES NOMINAL IN
EXTERNAL PREBENT KEY LENGTH0.050 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS0.750 INCHES NOMINAL IN
STYLE DESIGNATORKEY
OUTSIDE DIAMETER0.719 INCHES NOMINAL IN
MATERIAL THICKNESS0.030 INCHES MINIMUM AND 0.033 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.109 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
354-055Reference document
Same NSN cross-reference
Reference document — Secondary reference
99502680Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 20590-174?
20590-174 is a WASHER,KEY.
What parts can replace 20590-174?
There are 2 known substitutes for 20590-174: 354-055, 99502680. Substitute compatibility should be verified for your specific system.
What is the NSN for 20590-174?
20590-174 is cataloged in the U.S. Government catalog under NSN 5310-00-859-3818. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.