PartsTable
Technical Data Sheet
Download PDF

168638 — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

168638: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include hole_diameter: 1.031 INCHES NOMINAL IN, material_thickness: 0.083 INCHES NOMINAL IN, external_prebent_key_width: 1.500 INCHES NOMINAL IN, angle_between_external_keys: 60.0 DEGREES NOMINAL, external_prebent_key_length: 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN, overall_distance_including_keys: 1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-161-9723, 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
168638
NSN: 5310-00-161-9723
FSC: 5310 — Nuts and Washers
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
hole_diameter1.031 INCHES NOMINAL IN
material_thickness0.083 INCHES NOMINAL IN
external_key_quantity1
external_prebent_key_width1.500 INCHES NOMINAL IN
angle_between_external_keys60.0 DEGREES NOMINAL
external_prebent_key_length0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
overall_distance_including_keys1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN
distance_from_centerline_to_inside_of_prebent_key0.805 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN
NSN5310-00-161-9723
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 168638 · 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
•
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY: 0.805 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY LENGTH: 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.083 INCHES NOMINAL IN
•
EXTERNAL KEY QUANTITY: 1
•
EXTERNAL PREBENT KEY WIDTH: 1.500 INCHES NOMINAL IN
•
ANGLE BETWEEN EXTERNAL KEYS: 60.0 DEGREES NOMINAL
•
HOLE DIAMETER: 1.031 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DISTANCE FROM CENTERLINE TO INSIDE OF PREBENT KEY0.805 INCHES MINIMUM AND 0.815 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY LENGTH0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS1.888 INCHES MINIMUM AND 1.898 INCHES MAXIMUM IN
MATERIAL THICKNESS0.083 INCHES NOMINAL IN
EXTERNAL KEY QUANTITY1
EXTERNAL PREBENT KEY WIDTH1.500 INCHES NOMINAL IN
ANGLE BETWEEN EXTERNAL KEYS60.0 DEGREES NOMINAL
HOLE DIAMETER1.031 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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 168638?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 168638?
168638 is a WASHER,KEY.
What is the NSN for 168638?
168638 is cataloged in the U.S. Government catalog under NSN 5310-00-161-9723. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 168638

✓ 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.