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#### Torque-Tension Testing

The relationship between input torque and tension is the governing principle behind a well-designed bolted joint. Often, calculated values are not reciprocated in field applications. To determine the tension (also known as preload, clamp force, or clamp load), a Skidmore-Wilhelm

#### Why is it Important to Keep a Bolted Joint Tight?

It is well understood that a fastener will fail if it is loaded above its capacity, as shown in example #1 below. What is less obvious is a fastener will also fail if it is loaded below its capacity but

#### How Much Rotation Angle is Needed to Tighten a Fastener?

Hint: not as much as you think. To answer this question, let’s start with an example of a fastener assembly with a 3/4" x 10 Grade 5 bolt and nut and a 2” clamp distance, as shown in figure 1. Figure 1 For

#### How Much Does a Bolt Stretch?

Answer: a very small but important amount. In previous posts we discussed how a bolted joint works, how clamp force is calculated, and how to determine torque required to achieve the clamp force. This month we’ll present more details about the

#### Bolted Joint Torque Explanation and Calculation

We are often asked what torque value should be used with a specific nut/bolt assembly. First, it’s helpful to understand that torque is a rotational force that is equal to a linear force times the distance of that force from

#### How is Clamp Force for a Bolt and Nut Assembly Calculated?

Clamp force is what holds a bolted joint together. Published charts are available for determining clamp force but we’ve found it’s often useful to understand how these numbers are calculated. Image from smartbolts.com Bolt and nut ratings can be confusing. Bolts are

#### How Does a Bolted Joint Work?

A standard bolted joint consists of four parts: a fastener, object A, object B, and a bolt. The threads on a nut, unraveled, are an inclined plane that uses leverage to do work. The force of friction keeps the nut from