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17993B — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

17993B: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, thickness: 0.187 INCHES NOMINAL IN, hole_diameter: 2.875 INCHES NOMINAL IN, overall_diameter: 3.160 INCHES MINIMUM AND 3.170 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-381-9615, 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
17993B
NSN: 5310-01-381-9615
FSC: 5310 — Nuts and Washers
CAGE: 38490 — LIFTKING MANUFACTURING CORP (CAN)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
thickness0.187 INCHES NOMINAL IN
hole_diameter2.875 INCHES NOMINAL IN
overall_diameter3.160 INCHES MINIMUM AND 3.170 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN5310-01-381-9615
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 17993B · 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 DIAMETER: 3.160 INCHES MINIMUM AND 3.170 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: STEEL COMP 1020 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
•
HOLE DIAMETER: 2.875 INCHES NOMINAL IN
•
THICKNESS: 0.187 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER3.160 INCHES MINIMUM AND 3.170 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 1020 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER2.875 INCHES NOMINAL IN
THICKNESS0.187 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 1
A140753Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 17993B?
17993B is a WASHER,FLAT.
What parts can replace 17993B?
There is 1 known substitute for 17993B: A140753. Substitute compatibility should be verified for your specific system.
What is the NSN for 17993B?
17993B is cataloged in the U.S. Government catalog under NSN 5310-01-381-9615. 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.