Caps, Grips and Closures

Caps, grips and closures are protective devices for the ends of a shaft, tube, pipe, fitting, connector, screw, bar, or other shape. They can also be used to provide a hand grip or hanger tip. Caps are available in many different shapes and materials.  Common shapes include round, square, rectangular, round handle or hand grip, flat handle or hand grip, hex cap, “U” shape cap, “I” shape cap, 90° angle cap, screw cap or plug, and washer cap.  Common construction features include threaded, tapered, and anti-roll.  Threaded caps have a female thread.  The thread can be straight or tapered (NPT).  Caps have a female thread and plugs have a male thread.  Tapered caps and plugs have tapered sides, providing a snug fit.  Some can be used as either a cap or a plug.  Tapered caps and plugs are versatile and can be used for straight tubes and bars, male and female NPT threads, and male straight threads.  Anti-roll caps are round caps with a square end to prevent tube or shaft from rolling.