Stemco 640-0003 Threaded Aluminum Hub Cap – 6-1/4" Threaded Mount for Trailer Axles

The Stemco 640-0003 is a threaded aluminum hub cap designed specifically for trailer applications requiring a screw-on style cap. Engineered for durability and long service life, this hub cap is built to withstand demanding road conditions while keeping contaminants out and lubricant sealed in. It comes vented and includes a gasket for a secure, leak-resistant seal.

🔧 Product Specifications

• Part Number: 640-0003

• Mounting Style: Thread-on (screw-on)

• Thread Size: 6-1/4" – 8 UNC (coarse thread)

• Material: Cast Aluminum

• Lens: Clear polycarbonate lens for oil level visibility

• Fill Plug: 3/4" pipe thread (center)

• Vent Style: Vented

• Gasket Included: Yes (Stemco Gasket 330-3077)

• Application: Trailer axles (oil bath or semi-fluid grease)

🔁 Cross Reference Part Numbers

STEMCO 640-0003, Chicago Rawhide 1283, National 365-5075, Dayton 334-1500, Meritor R301042, Euclid E-1441, SKF 347-4075, Transcom 221503, Automann 104.6400003

✅ Key Features

• Threaded Design: Screws securely onto trailer hubs for fast installation

• High-Strength Aluminum: Corrosion-resistant and impact-resistant construction

• Vented with Oil Plug: Allows for safe pressure release and convenient filling

• Clear Lens: Easy oil level inspection

• OE Fit: Built to match factory specifications for trusted performance