S276 US Type Eye Bolt

Here’s an explanation of each part:

1. Eye Bolt:
   • This is the fundamental component. An eye bolt is a bolt with a looped head (the “eye”) on one end and threads on the other.
   • The eye is designed to have a rope, cable, shackle, or hook passed through it, allowing it to serve as an attachment point.
   • The threaded shank is screwed into a tapped hole or secured with a nut.
2. US Type:
   • This indicates that the eye bolt conforms to design standards, dimensions, or common practices prevalent in the United States.
   • This often implies:
     • Forged Construction: “US Type” eye bolts, especially for lifting, are typically forged (shaped by hammering or pressing hot metal) rather than bent from wire. Forging provides superior strength and durability.
     • Imperial Threads: The threads are likely to be Unified National Coarse (UNC) or Unified National Fine (UNF), which are standard inch-based thread systems in the US.
     • Specific Proportions/Shoulder Design: There may be particular design features, such as the presence or absence of a shoulder (a flange below the eye). Shouldered eye bolts are designed for angular lifts, while non-shouldered (plain pattern) eye bolts are generally intended for straight, in-line pulls only. A common standard for forged US-type eye bolts is ASME B18.15.
3. S276:
   • This most likely refers to the steel grade used in the manufacture of the eye bolt.
   • “S” typically denotes structural steel.
   • “276” likely indicates the minimum yield strength of the steel in megapascals (MPa). So, S276 steel would have a minimum yield strength of approximately 276 MPa (which is around 40,000 psi).
   • This is a common grade of carbon or low-alloy steel that offers a good balance of strength, toughness, and formability, making it suitable for manufacturing components like eye bolts that need to withstand significant loads. It’s similar in strength to other common structural grades like S275JR (a European standard).

In summary:

An “S276 US Type Eye Bolt” is a forged steel eye bolt, manufactured according to US standards or common designs (likely with imperial threads), and made from a steel grade (S276) with a nominal minimum yield strength of 276 MPa.

Key things to consider when using such an eye bolt:

• Load Rating (Working Load Limit – WLL): Always check the manufacturer’s specified Working Load Limit (WLL). This is the maximum load the eye bolt is designed to handle safely.
• Direction of Pull: Shouldered eye bolts can handle angular loads (up to a certain degree, with reduced WLL), while plain pattern (non-shouldered) eye bolts should only be loaded in line with the shank.
• Proper Installation: Ensure it’s correctly threaded into a hole of sufficient depth and material strength, or properly secured with a nut and washer if it’s a through-bolt.
• Inspection: Regularly inspect for wear, damage, or corrosion.

They are commonly used in rigging, construction, manufacturing, and marine applications for lifting machinery, securing equipment, or providing attachment points.