Mounting Bolt

Product Description

A mounting bolt is a broad term for any fastener used to secure a component to a fixed surface, frame, or base. Unlike standard bolts used to join two loose parts together, mounting bolts are specifically intended to provide a stable, vibration-resistant anchor for machinery, structural elements, or equipment.

Depending on the load requirements and the material of the base, mounting bolts fall into several distinct categories:

1. Machine Mounting Bolts

Used to secure motors, pumps, or industrial equipment to metal frames or concrete pads.

• Hex Head Bolts: Often used with washers to distribute load on metal frames.

• Shoulder Bolts: Features an unthreaded "shoulder" that allows for precise positioning or acts as a pivot point while the component is mounted.

• Tap Bolts: Fully threaded bolts used when the mounting hole is tapped (threaded) directly into the base rather than using a nut.

2. Concrete and Masonry Anchors

When mounting equipment to a floor or wall, specialized bolts are required to grip the non-threaded material.

• Wedge Anchors: As the bolt is tightened, a wedge expands against the sides of the hole.

• Sleeve Anchors: A sleeve expands along the entire length of the bolt, ideal for brick or softer concrete.

• L-Bolts (Anchor Bolts): These are embedded directly into wet concrete during the pouring stage, with the threaded end sticking out to receive a machine base.

3. Specialty Mounting Fasteners

• U-Bolts: Shaped like the letter "U" with threads on both ends; primarily used for mounting pipes or round tubes to a flat surface.

• J-Bolts: Used to hook around rebar or structural members before being tightened down.

• Carriage Bolts: Features a square neck under a smooth rounded head; used for mounting components to wood or thin metal where the bolt must not turn during tightening.

Selection Criteria

When choosing a mounting bolt, engineers typically evaluate three critical factors:

• Shear vs. Tension: Will the weight pull the bolt straight out (tension) or try to slide the component across the surface (shear)?

• Vibration Resistance: Machines that vibrate require mounting bolts with locking features, such as nylon-insert nuts, split washers, or anaerobic thread-locking compounds.

• Corrosion Protection: For outdoor or industrial mounts, stainless steel (e.g., 304 or 316) or hot-dip galvanized coatings are standard to prevent "seizing," which makes future maintenance or removal impossible.