PartsTable
Technical Data Sheet
Download PDF

123HM40018-1 — KEY,MACHINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

123HM40018-1: KEY,MACHINE.

The KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, flat_height: 0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, overall_width: 0.237 INCHES MINIMUM AND 0.247 INCHES MAXIMUM IN, overall_height: 0.312 INCHES NOMINAL IN, overall_length: 0.375 INCHES NOMINAL IN, hardness_rating: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-941-6323, 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
123HM40018-1
NSN: 5315-00-941-6323
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 79RG9 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flat_height0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
overall_width0.237 INCHES MINIMUM AND 0.247 INCHES MAXIMUM IN
overall_height0.312 INCHES NOMINAL IN
overall_length0.375 INCHES NOMINAL IN
hardness_rating39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSTEPPED
first_flat_length0.325 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
mounting_hole_depth0.237 INCHES MINIMUM AND 0.247 INCHES MAXIMUM IN
starting_edge_shapeSTRAIGHT
mounting_hole_diameter0.045 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
NSN5315-00-941-6323
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 123HM40018-1 · 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: 7.021 FSCM 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
•
FIRST FLAT LENGTH: 0.325 INCHES NOMINAL IN
•
MOUNTING HOLE TYPE AND QUANTITY: 1 PLAIN
•
HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
•
STARTING EDGE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: STEPPED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5612 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.312 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION7.021 FSCM 26512 MFR REF SINGLE TREATMENT RESPONSE OVERALL
FIRST FLAT LENGTH0.325 INCHES NOMINAL IN
MOUNTING HOLE TYPE AND QUANTITY1 PLAIN
HARDNESS RATING39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
STARTING EDGE SHAPESTRAIGHT
STYLE DESIGNATORSTEPPED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5612 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MOUNTING HOLE DIAMETER0.045 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
OVERALL LENGTH0.375 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
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 123HM40018-1?
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 123HM40018-1?
123HM40018-1 is a KEY,MACHINE.
What is the NSN for 123HM40018-1?
123HM40018-1 is cataloged in the U.S. Government catalog under NSN 5315-00-941-6323. 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 — 123HM40018-1

✓ 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.