Atkore M777-3/8 Junior Top Beam C-clamp 350 Lb

Product Description

The ATKORE M777-3/8 is a junior top beam C-clamp engineered for secure clamping under roof installations in bar joist construction. Fabricated from malleable iron with a gold galvanized finish, this clamp is rated to handle up to 350 pounds of load. The 3/4-inch maximum jaw capacity and 2-inch body length make it a compact, reliable fastening solution for suspending conduit, pipe, and mechanical supports from structural steel bar joists. Licensed electricians, pipefitters, and mechanical contractors rely on this type of hardware in commercial and industrial overhead installations where a dependable, corrosion-resistant clamp is required.

This C-clamp is specifically designed for roof installation applications involving bar joist construction. The junior top configuration allows the clamp to seat firmly on the top flange of a bar joist, providing a stable attachment point for suspended systems. It is well suited for commercial buildings, warehouses, and industrial facilities where conduit runs, pipe hangers, or mechanical system supports must be anchored overhead without welding or drilling into structural members.

Key Features

• Junior top beam design seats on the top flange of bar joists for overhead installations
• 350-pound load rating supports conduit, pipe, and mechanical system hangers
• Malleable iron construction resists deformation under sustained load
• Gold galvanized finish provides corrosion resistance in commercial environments
• 3/4-inch maximum jaw capacity suits standard structural bar joist flanges
• 3/8-inch rod thread accommodates standard hanger rod sizing

Compatibility

Designed as an OEM-style hardware component for use with bar joist construction in commercial and industrial roof installation applications where 3/8-inch hanger rod and 3/4-inch jaw capacity are required.

Installation Notes

Installation is typically performed by licensed electricians, pipefitters, or mechanical contractors working on overhead structural systems. De-energize any nearby electrical systems and ensure the bar joist is structurally sound before attaching the clamp. Tighten the clamp bolt securely to the joist flange before applying any suspended load, and verify the load does not exceed the 350-pound rating. Always follow applicable NEC and local mechanical code requirements for hanger spacing and support intervals.

Technical Specifications

• Type: Junior Top Beam C-Clamp
• Load Capacity: 350 pounds
• Maximum Jaw Capacity: 0.75 inches
• Rod Size: 3/8 inches
• Body Length: 2 inches
• Material: Malleable Iron
• Finish: Gold Galvanized
• Application: Roof Installation, Bar Joist Construction
• Package Dimensions: 10.5 inches L x 8.5 inches W x 5.7 inches H
• Package Weight: 30.0 pounds

Standard Information

• Brand: ATKORE
• Manufacturer Part Number: M777-3/8