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18 Z 1D55 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

18 Z 1D55: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 3.582 INCHES MINIMUM AND 3.612 INCHES MAXIMUM IN, heat_treatment: ANNEALED, outside_diameter: 4.281 INCHES MINIMUM AND 4.326 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-169-2916, 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
18 Z 1D55
NSN: 5310-01-169-2916
FSC: 5310 — Nuts and Washers
CAGE: 27315 — MORRIS MATERIAL HANDLING, INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter3.582 INCHES MINIMUM AND 3.612 INCHES MAXIMUM IN
heat_treatmentANNEALED
outside_diameter4.281 INCHES MINIMUM AND 4.326 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.125 INCHES NOMINAL IN
external_key_quantity19
external_prebent_key_width0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
internal_prebent_key_width0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
internal_prebent_key_length0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
overall_distance_including_keys4.891 INCHES MINIMUM AND 4.953 INCHES MAXIMUM IN
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
NSN5310-01-169-2916
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 18 Z 1D55 · 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 PREBENT KEY WIDTH: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 4.891 INCHES MINIMUM AND 4.953 INCHES MAXIMUM IN
•
HEAT TREATMENT: ANNEALED
•
STYLE DESIGNATOR: KEY
•
OUTSIDE DIAMETER: 4.281 INCHES MINIMUM AND 4.326 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.125 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 19
•
INTERNAL PREBENT KEY LENGTH: 0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY WIDTH0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS4.891 INCHES MINIMUM AND 4.953 INCHES MAXIMUM IN
HEAT TREATMENTANNEALED
STYLE DESIGNATORKEY
OUTSIDE DIAMETER4.281 INCHES MINIMUM AND 4.326 INCHES MAXIMUM IN
MATERIAL THICKNESS0.125 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY19
INTERNAL PREBENT KEY LENGTH0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
EXTERNAL PREBENT KEY WIDTH0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 18 Z 1D55?
18 Z 1D55 is a WASHER,KEY.
What is the NSN for 18 Z 1D55?
18 Z 1D55 is cataloged in the U.S. Government catalog under NSN 5310-01-169-2916. 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.