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ST3M644-1 — PIN,LOCK

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ST3M644-1: PIN,LOCK.

The PIN,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, prong_length: 1.860 INCHES NOMINAL IN, opening_width: 0.420 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL, wire_stock_diameter: 0.080 INCHES NOMINAL IN, material_document_and_classification: ASTM A580 COND B ASSN STD SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-256-5317, 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
ST3M644-1
NSN: 5315-01-256-5317
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
prong_length1.860 INCHES NOMINAL IN
opening_width0.420 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
wire_stock_diameter0.080 INCHES NOMINAL IN
material_document_and_classificationASTM A580 COND B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-01-256-5317
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ST3M644-1 · 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
•
WIRE STOCK DIAMETER: 0.080 INCHES NOMINAL IN
•
OPENING WIDTH: 0.420 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A580 COND B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
PRONG LENGTH: 1.860 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
MATERIAL: STEEL COMP 316 OVERALL
TECHNICAL CHARACTERISTICS
WIRE STOCK DIAMETER0.080 INCHES NOMINAL IN
OPENING WIDTH0.420 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A580 COND B ASSN STD SINGLE MATERIAL RESPONSE OVERALL
PRONG LENGTH1.860 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE OVERALL
MATERIALSTEEL COMP 316 OVERALL
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ST3M644-1?
ST3M644-1 is a PIN,LOCK.
What is the NSN for ST3M644-1?
ST3M644-1 is cataloged in the U.S. Government catalog under NSN 5315-01-256-5317. 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.