PartsTable
Technical Data Sheet
Download PDF

ST3M443-40 — NUT SPACER,PLATE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M443-40: NUT SPACER,PLATE.

The NUT SPACER,PLATE is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, plate_width: 0.554 INCHES MAXIMUM IN, plate_thickness: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN, surface_treatment: PASSIVATE OVERALL, nut_mounting_provision: STRAIGHT HOLES, mounting_hole_arrangement_style: 2 HOLES. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-229-9981, 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
ST3M443-40
NSN: 5310-01-229-9981
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
plate_width0.554 INCHES MAXIMUM IN
plate_thickness0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
surface_treatmentPASSIVATE OVERALL
nut_mounting_provisionSTRAIGHT HOLES
mounting_hole_arrangement_style2 HOLES
material_document_and_classificationAMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-229-9981
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M443-40 · 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
•
PLATE THICKNESS: 0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
•
PLATE WIDTH: 0.554 INCHES MAXIMUM IN
•
MOUNTING HOLE ARRANGEMENT STYLE: 2 HOLES
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: IRON ALLOY 660 OVERALL
•
NUT MOUNTING PROVISION: STRAIGHT HOLES
TECHNICAL CHARACTERISTICS
PLATE THICKNESS0.028 INCHES MINIMUM AND 0.036 INCHES MAXIMUM IN
PLATE WIDTH0.554 INCHES MAXIMUM IN
MOUNTING HOLE ARRANGEMENT STYLE2 HOLES
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALIRON ALLOY 660 OVERALL
NUT MOUNTING PROVISIONSTRAIGHT HOLES
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 2
10110180Reference document
Same NSN cross-reference
Reference document — Informative reference only
F18421-04Reference 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
Ready to buy ST3M443-40?
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 ST3M443-40?
ST3M443-40 is a NUT SPACER,PLATE.
What parts can replace ST3M443-40?
There are 2 known substitutes for ST3M443-40: 10110180, F18421-04. Substitute compatibility should be verified for your specific system.
What is the NSN for ST3M443-40?
ST3M443-40 is cataloged in the U.S. Government catalog under NSN 5310-01-229-9981. 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 — ST3M443-40

✓ 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.