Steel Manufacturing Blog: Keeping it Steel

Hillside Washers and Bracer Rod Washers

Posted on Wed, Sep 28, 2016 @ 08:00 AM

The typical Hillside Washer, also known as a Bracer Rod Washer, is made from ductile iron and serves the purpose of providing a perpendicular surface regardless of the angle of the Turnbuckle Rod they are anchoring. As shown in the illustration, the oval surface will allow a nut and washer to seat itself at the proper angle just by the tension created when tightening the turnbuckle.

Hillside Washers and Bracer Rod WashersThe locking tab on the underside slots into the hole and stops the Hillside Washer from sliding in the direction of the tension. This is all that is necessary to hold it in place.

Because the Hillside Washer is made from ductile cast iron, Steel Fabricators and Erectors have asked if it is weldable. Not all grades of cast iron can be welded. Of those that can be, special steps need to be followed to assure the steel is fused. Again, it is designed to work with only the tension of the rod holding it in place.

Hillside Washers and Bracer Rod WashersItems like these are often overlooked in a project until they are needed. For that reason, The Steel Supply Company stocks all sizes in significant depth. This includes Hot Dip Galvanized Hillside Washers.

While galvanizing this type of item, it is no more difficult that galvanizing our slotted steel shims and is just as time consuming. A typical galvanizing turnaround time is 5 working days. In addition, most galvanizers have a minimum lot charge. For example, if a Fabricator was needed on 10 Bracer Rod Washers and they needed to get galvanized, the cost for galvanizing alone could exceed $ 10.00 each.

By galvanizing large quantities in advance and combining the Hillside Washers with other products, like our Slotted Steel Shims or Anchor Bolts, we are able to keep the cost of Hot Dip galvanizing and transportation to a minimum. This offers the Steel Fabricator and Erector much lower costs and the ability to ship same day. 

Hillside Washers and Bracer Rod Washers

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Tags: Hillside Washers

Slide Bearing Thickness: Watch The Cost!

Posted on Wed, Sep 14, 2016 @ 09:00 AM

The typical Slide Bearing design used in Steel Fabricating, whether Teflon®, Virgin PTFE or Fluorogold®, is 7/32” thick. This is comprised of a 1/8” thick steel backing plate and 3/32” Teflon® bonded to it. Most often, they are in pairs with the Teflon® surfaces in the middle as shown in the illustration.

Slide Bearing Thickness

As configured above the Upper and Lower Slide Bearing Assembly would be 7/16” thick.

At times we see drawings calling for thicker slide bearing assemblies. The designer often accomplishes this by increasing; 1- The thickness of the backing plate, 2- The thickness of the Teflon® or Fluorogold®, or 3- they increase both.

This is an acceptable approach, and it will get the job done, but often it incurs unnecessary cost and expensive project delays. As well, increasing the thickness of the Teflon® will also increase the amount it compresses under a load. When the load is great enough the compression becomes permanent and the desired thickness is lost. A simple understanding of that principle can be found in the compression tests The Steel Supply Company performs on our construction grade plastic shims.

Using as an example, the Slotted Plastic Shims 3” x 4” below show the compressive strengths, as derived from the most recent set of tests. It is important to understand the criteria for success and failure of the product being tested. In the case of Plastic Construction Shims, that is “Permanent Deflection.” In other words, the shim is compressed under a load, the load is released, and the shim is examined to see if it is still its original shape and dimensions. Then the load is increased, the shim is checked again for dimensions. This process repeats until “permanent deflection” occurs, meaning after the load is removed, the shim does not return to its original dimensions. This is an essential characteristic, in which both of our Slotted Plastic Shims and Solid Plastic Shim Plates are intended for use in Steel Fabricating and Erecting, Concrete and Masonry Contracting, Plate Glass, Tilt-Up Concrete, Curtain Wall and many other very demanding areas of construction.

3” x 4” Slotted Plastic Shim Slide Bearing Thickness
Shown in photo

Thickness              Compression
1/32”                      127,000 lbs.
1/16”                      95,000 lbs.
1/8”                         75,000 lbs.
1/4”                         70,000 lbs.
3/8”                         45,000 lbs.
1/2”                         30,000 lbs.

As the chart illustrates, these shims made from the same High Impact Polystyrene or Polypropylene Plastic have an ability to resist compression that decreases as the shim gets thicker. The same holds true for Teflon®, PTFE or Fluorogold®. So with that in mind, when designing a Slide Bearing, taking up space by increasing the thickness of the Teflon® comes with additional factors.

The more common way a designer will make the Slide Bearing taller is to increase the thickness of the backing plate. While this is a more secure solution, it still creates cost and project delays, in that it is a made to order product. The simplest and fastest way to increase the thickness of the assembly is to add an additional shim backing plate.

Starting with the standard FC-1010-CS Slide Bearing Assembly, which is 7/16” thick counting the upper and lower member, add a solid steel shim plate to either the top or bottom at the thickness required. The shim plate should be at least the same dimensions as the backing plate it is in contact with. It can be longer or wider if the circumstances call for it. Any holes or slots in the slide bearing should be exactly the same in the shim plate. Also, it is essential that the holes and slot are aligned perfectly with the ones assembled. It’s usually best to do this before the Slide Bearing is installed and tack weld the spacer shim and backing plate, rather than trying to align everything during erection.

It is always recommended that any change in design be approved by the project engineer.

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