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40R23 — NUT,PLAIN,SPLINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

40R23: NUT,PLAIN,SPLINE.

The NUT,PLAIN,SPLINE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, nut_style: SPLINE, nut_height: 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN, nut_diameter: 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN, pilot_length: 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN, thread_class: 2B. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-441-8597, 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
40R23
NSN: 5310-01-441-8597
FSC: 5310 — Nuts and Washers
CAGE: 04729 — UNICORP. (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OVERALL
nut_styleSPLINE
nut_height0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
nut_diameter0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
pilot_length0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
pilot_diameter0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
countersink_angle90.0 DEGREES NOMINAL NUT
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.250 INCHES IN
NSN5310-01-441-8597
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 40R23 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NUT COUNTERBORE DEPTH: 0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM NUT IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
NUT DIAMETER: 0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
•
COUNTERBORE DIAMETER: 0.293 INCHES MINIMUM AND 0.297 INCHES MAXIMUM NUT IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NUT COUNTERBORE DEPTH0.308 INCHES MINIMUM AND 0.318 INCHES MAXIMUM NUT IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
NUT DIAMETER0.497 INCHES MINIMUM AND 0.503 INCHES MAXIMUM IN
COUNTERBORE DIAMETER0.293 INCHES MINIMUM AND 0.297 INCHES MAXIMUM NUT IN
PILOT DIAMETER0.364 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN
PILOT LENGTH0.075 INCHES MINIMUM AND 0.085 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 1
3168812-0012Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 40R23?
40R23 is a NUT,PLAIN,SPLINE.
What parts can replace 40R23?
There is 1 known substitute for 40R23: 3168812-0012. Substitute compatibility should be verified for your specific system.
What is the NSN for 40R23?
40R23 is cataloged in the U.S. Government catalog under NSN 5310-01-441-8597. 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.