Fittings are stamped from high quality steel which is .095"/2.4mm thick.  They are designed for maximum clamping and holding force, and can be used and reused. The finish is a tough black oxide that is chip and rust resistant. For further tube retention many of the fitting bodies have two deep stamped ribs which help grip the tubes. This insures structural rigidity and design integrity.

Each fitting also features a patent pending Clamptight® hole design that allows you to make your rack construction semi or fully permanent. Each fitting has a 4mm hole punched through it which provides a pilot hole to affix the fitting to the tube. For semi permanent applications the tube can be fastened with a #8 x 1/4 self- drilling, indented hex washer head screw. For permanent applications use a 4.2mm drill and Avdel #1624-D514 blind rivet. Both the self- drilling fasteners, rivets and 4.2mm drill are available.

Benefits are: 

• Structural integrity for higher loads.
• Vibration proofing, in active load applications.
• Maximum tube retention for carts and tugging applications.
• The rivet provides a tamper proof design.
• Can be used as a safety check to insure that the tube has been fully inserted and seated.

Fittings with the QC part number are complete connectors including socket head cap screw and barrel nuts. The QC-8 (parallel Hinge) and QC-10 (tee hinge) also include the Q-140 bushings. If you decide to make your fittings either permenant or semipermanent order the hex washer head self-drilling screw.