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5F4338 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

5F4338: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.688 INCHES NOMINAL0.688 INCHES NOMINAL IN, outside_diameter: 1.188 INCHES NOMINAL1.188 INCHES NOMINAL IN, style_designator: KEYKEY, material_thickness: 0.188 INCHES NOMINAL0.188 INCHES NOMINAL IN, external_key_quantity: 44. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-271-3178, 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
5F4338
NSN: 5310-00-271-3178
FSC: 5310 — Nuts and Washers
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.688 INCHES NOMINAL0.688 INCHES NOMINAL IN
outside_diameter1.188 INCHES NOMINAL1.188 INCHES NOMINAL IN
style_designatorKEYKEY
material_thickness0.188 INCHES NOMINAL0.188 INCHES NOMINAL IN
external_key_quantity44
external_straight_key_width0.495 INCHES MAXIMUM0.495 INCHES MAXIMUM IN
overall_distance_including_keys1.625 INCHES NOMINAL1.625 INCHES NOMINAL IN
NSN5310-00-271-3178
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 5F4338 · 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
•
OVERALL DISTANCE INCLUDING KEYS: 1.625 INCHES NOMINAL1.625 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEYKEY
•
OUTSIDE DIAMETER: 1.188 INCHES NOMINAL1.188 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.188 INCHES NOMINAL0.188 INCHES NOMINAL IN
•
EXTERNAL STRAIGHT KEY WIDTH: 0.495 INCHES MAXIMUM0.495 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 44
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.688 INCHES NOMINAL0.688 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DISTANCE INCLUDING KEYS1.625 INCHES NOMINAL1.625 INCHES NOMINAL IN
STYLE DESIGNATORKEYKEY
OUTSIDE DIAMETER1.188 INCHES NOMINAL1.188 INCHES NOMINAL IN
MATERIAL THICKNESS0.188 INCHES NOMINAL0.188 INCHES NOMINAL IN
EXTERNAL STRAIGHT KEY WIDTH0.495 INCHES MAXIMUM0.495 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY44
MATERIALSTEEL OVERALL
HOLE DIAMETER0.688 INCHES NOMINAL0.688 INCHES NOMINAL 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 5F4338?
5F4338 is a WASHER,KEY.
What is the NSN for 5F4338?
5F4338 is cataloged in the U.S. Government catalog under NSN 5310-00-271-3178. 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.