Proto J402A C-clamp 2 in 3500 Lb Steel Black Oxide

Product Description

The PROTO J402A is a steel C-clamp rated for 3,500 pounds of load capacity, built for heavy-duty clamping in fabrication, welding, and general mechanical work. The clamp features a 2-inch maximum opening and a 2-inch throat depth, making it suited for workpieces that require a secure, controlled grip. The body, spindle, and anvil are all steel construction with a black oxide finish for corrosion resistance. A smooth swivel pad on the anvil allows the clamping surface to seat flush against irregular or angled workpieces without requiring adjustment. This clamp is installed and used by machinists, welders, pipefitters, and maintenance technicians.

The J402A is designed for use in workshops, fabrication shops, and field maintenance applications where a reliable fixed C-clamp is required. Its 2-inch throat depth provides clearance for standard workpiece thicknesses in structural clamping and assembly tasks. The black oxide coating helps resist surface rust in typical shop environments. This clamp is appropriate for both stationary bench work and portable field use where a compact, high-load clamp is needed.

Key Features

• 3,500 lb load capacity for heavy-duty clamping applications
• 2-inch maximum opening accommodates a range of workpiece sizes
• 2-inch throat depth provides adequate clearance for standard assemblies
• Full steel construction — body, spindle, and anvil — for durability under load
• Smooth swivel pad seats flush against flat or slightly angled surfaces
• Black oxide finish provides basic corrosion resistance in shop environments

Compatibility

Designed as an OEM-style C-clamp replacement or addition for general fabrication, welding, and mechanical assembly applications requiring a 2-inch opening with 3,500 lb capacity.

Installation Notes

C-clamps are typically set by hand and tightened with a tommy bar or T-handle; no power tools are required. Always ensure the swivel pad is fully seated against the workpiece before applying full clamping pressure. Do not exceed the rated 3,500 lb load capacity. Inspect the spindle threads and swivel pad for wear or damage before each use.