亚博系列全平台入口

The 亚博系列全平台入口 Supply Company has added several new items to the selection of All Threaded Rod. These include;

Direct Tension Indicator Washers

The DTI Washer, also known as the Squirter Washer, has been around a while in various forms. It has two basic functions; 1) to assure the bolt is delivering the required tension on the connection, and 2) speed of installation.

Structural 亚博系列全平台入口, Bridge or Slip Critical Connections are required to meet a minimum compressive strength. The standard TC Bolt has a spline that will shear off when the appropriate tension level is achieved. This is the fastest, most efficient method of bolting connections but it cannot guaranty the plies are compressed as the sheared spline would indicate. The pressure the TC Bolt spline is responding to it the torque created as the nut tightens. The problem is the same torque is generated if anything jams the nut while it tightening. Any debris in the threads, typically sand or a metal shaving can act as a wedge jamming the nut from turning and developing the torque to snap the spline prematurely.

The DTI, or Direct Tension Indicator Washer, functions on a completely different premise. It measures the pressure the bolt is delivering to the steel plies. By offering resistance as the bolt is compressed the DTI will hold its shape until the compression reaches the required amount. At this point the ridges will begin to compress. As they do, the semi cured silicone will exit the cavity through the small channels on the bottom of the DTI Washer. See Fig. 1. As compression continues the silicone visible at the sides of the washer increases. Once the correct pressure is determined it is possible to estimate the pressure on subsequent connections by the amount of silicone at the sides of the washer.

When using Direct Tension Indicator Washers correct assembly is important, and there are several ways it can be done. The image to the right shows one method of assembly before compression begins. The DTI Washer can sit directly on the steel member surface, but the compression bumps must be facing the nut. An F-436 hardened washer should sit between the Squirter Washer and the Heavy Hex Nut.

In all cases the ridges do not face the steel member, As well, it is important they do not touch the turning surface directly. They can sit under a bolt head without a washer as long as the bolt head will not be rotating when the bolt is being tightened. 

For more detailed information on DTI washers click here.

Constantly in the news are issues and questions regarding the import tariffs the U.S. Government is instituting and how they will affect the steel fabricating and construction industries. Here is a quick overview from our perspective.

Stops Zinc from adhering to selected areas of steel during the Hot Dip Galvanizing process.

As the Rebar Anchor becomes more prevalent in building design steel fabricators are experimenting with ways to fulfill these requirements more efficiently. The most common types of Rebar Anchors are;

In many of the requests we receive for Fluorogold庐 or Teflon庐 Slide Bearing Assemblies the fabricator is under the impression the specific dimensions they require will cut to size, then bonded together and finished. This can be done, but only starts to make economic sense when the requirements call for a large quantity of the same dimensions.

As discussed in previous blogs The 亚博系列全平台入口 Supply Company uses several methods of making slotted steel shims. These are confined into two main groups; hard tooling and soft tooling. Click here to view that discussion.

To suit their purpose, Slotted 亚博系列全平台入口 Shims need to be produced as flat as possible. The 亚博系列全平台入口 Supply Company can manufacture perfectly flat shims with literally zero practical deflection by cutting the shims from plate stock on a laser table. The problem with this method is higher costs, which escalate even further as the shim thickness increases.

The 亚博系列全平台入口 Supply Company uses a variety of processes when manufacturing Slotted 亚博系列全平台入口 Shims. For stock sizes Punch and Die Stamping is the most effective. For made to order sizes or multiple slot shims laser cutting produces very accurate results. Heavier material like 1/2鈥� thick or thicker tends to be more economical using a High Definition Plasma table. Regardless of the process our customer, the steel fabricator and erector, requires the same thing, i.e. accurate, flat shims that can be installed with no hesitation or interruption and that provide 100% surface contact.