text: The working load limits on this page apply only to machinery eye bolts and machinery eye bolts with shoulders. If an angular lift is required, a properly seated shoulder pattern machinery eye bolt must be used. Eye bolts are commonly used to attach lines to objects, for instance attaching a cable to the back of a painting to allow the painting to hang from a nail on a wall. For critical high-tensile-strength applications, low-grade bolts may fail, resulting in damage or injury.The same type of screw or bolt can be made in many different grades of material. Working load limits for eye bolts are based on a straight vertical Bimetallic Screw lift in a gradually increasing manner.Differentiation between bolt and screwA bolt passes through a hole of larger diameter than its thread, and is held in place by a nut or similar device; it is not designed to be turned.
  Its main uses are as a threaded fastener used to hold objects together, and as a simple machine used to translate torque into linear force. Even porcelain and glass can have molded screw threads that are used successfully in applications such as electrical line insulators and canning jars. If threaded all the way to the back of the head a cap screw becomes a machine screw. The working load limits for regular forged eye bolts can be found on our Forged Eye Bolt Working Load Limits page. Cap screws may, or may not be used with nuts. Machinery eye bolts without a shoulder should not be used for angular loads. Such inferior fasteners are a danger to life and property when used in aircraft, automobiles, heavy trucks, and similar critical applications. It can also be defined as an inclined plane wrapped around a shaft. Machinery eyes are fully threaded.Eye BoltsAn Eye Bolt is a small screw with a loop on one end and threads on the other end.Materials and strengthScrews and bolts are made in a wide range of materials, with steel being perhaps the most common, in many varieties. The distinction is subtle, but significant in the design of the fastener. Where great resistance to weather or corrosion is required, stainless steel, titanium, brass or bronze may be used, or a coating such as brass, zinc or chromium applied.A screwA screw is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw.
  Angular lifts must never be more than a 45 degree pull. Like wire eye bolts, wire eye lags are intended for light duty applications and should not be used for angular loads. Wire eye lags (also referred hr-screw to as screw thread eye bolts, eye screws, or turned/bent eye lags) have a wood screw thread for use in wood or lag anchors. Electrolytic action from dissimilar metals can be prevented with aluminium screws for double-glazing tracks, for example. What is often referred to as a bolt is in fact a cap screw, which is designed to be turned (or screwed). Loads should always be applied to eye bolts in the plane of the eye, not at an angle to this plane.Angular lifts will significantly lower working load limits and should be avoided whenever possible. On SAE-standard bolts, a distinctive pattern of marking is impressed on the heads to allow inspection and validation of the strength of the bolt.Drop forged machinery eye bolts.
  However, low-cost counterfeit fasteners may be found with actual strength far less than indicated by the markings. Some types of plastic, such as nylon or Teflon, can be threaded and used for fastening requiring moderate strength and great resistance to corrosion or for the purpose of electrical insulation.