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Metal Spacers

SPIROL tubular Spacers are used as standoffs, distance bushings, sleeves, axles, and pins. They replace more expensive spacing options of cut-off tubing, tubes, ferrules, grommets and turned parts. SPIROL Spacers are formed into closed seam tubes from cold rolled strip. The component cost savings are achieved through:

  • Use of SPIROL’s proprietary, highly flexible and efficient production technology.
  • SPIROL’s roll-formed tubular Spacer design has tolerances that meet typical application requirements for spacing components apart from each other. This prevents unnecessarily close tolerances associated with manufacturing technologies required to produce more expensive alternative products such as cut tubing, machined bushings, etc.

A typical application for a tubular Spacer is to separate two components in an assembly joined by a bolt, rivet or rod passed through the inside diameter of the Spacer. The inside diameter of the Spacer is designed for a clearance fit over the bolt.

While SPIROL offers distinct diameter and length combinations in the product catalog, intermediate lengths can often be produced quickly, without any special tooling due to SPIROL's proprietary manufacturing process.

SPIROL's standard range of roll formed tubular Spacers includes both metric and inch specifications in a variety of diameters and lengths. Most standard diameters are available in two wall thickness options, standard wall and heavy wall, to accommodate specific application strength and bearing requirements.

  • SP100 Standard Wall Spacers are typically used in static applications without excessive external forces acting on the joint. SP100 Standard Wall Spacers are available in metric and inch in sizes ranging from 3mm to 20mm / #4 to .750" in low carbon steel with ArmorGalv® finish. SP100 standard wall Spacers are also available to order in austenitic stainless steel and aluminum.
  • SP150 Heavy Wall Spacers have greater compression strength and additional bearing surface. The additional bearing surface is often used to prevent witness marks or indenting when the Spacer is clamped between soft materials. SP150 Heavy Wall Spacers are available in metric and inch sizes in sizes ranging from 3mm to 16mm / #4 to .750" in low carbon steel with ArmorGalv® finish. Additional materials and finishes are available upon request.

The benefits of using SPIROL's standard tubular Spacers are as follows:

  • Reduced cost and no tooling charges — particularly in low- or medium-volume applications.
  • SPIROL's extensive inventory of standard tubular Spacers allows for just-in-time delivery and reduced inventories.
  • No excess components at the end of a production run.
  • SPIROL’s expansive standard tubular Spacer size range meets most application requirements and eliminates the need for custom-designed parts.
  • The standard finish for SPIROL's Spacers is ArmorGalv®. ArmorGalv® is a zinc alloy thermal diffusion coating that offers over 1,000 hours of salt spray protection with full coating on the ID and OD of the part with no insignificant surfaces. Read more about The Features and Benefits of ArmorGalv® Thermal Zinc Diffusion coating.

Application Engineering Assistance: If you would like assistance in selecting the proper tubular Spacer for your assembly, please Request Engineering Support! We are here to help!

Spacer Types

The nominal diameter of SPIROL's tubular Spacers is designed around the size of the bolt passing through the inner diameter of the Spacer. Spacers are available in two standard wall thicknesses, standard wall and heavy wall, to meet the bearing surface and columnar strength requirements for each application.

SPIROL also offers Spacers designed for specific applications such as conveyors and garage doors, and custom tubular Spacers with special diameters, lengths, materials, finishes as well as in custom configurations to meet unique requirements are available upon request.

Don’t See What You’re Looking For?

Need help choosing the most appropriate tubular Spacer for your application? SPIROL's expert engineers will review your specific requirements, and design the most cost-effective Spacer to meet your technical and commercial needs. Let us help!

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Standard Material

Low Carbon Steel
Low carbon steel is the most economical material to manufacture roll formed Spacers from in the absence of any plating or coating. Additional coatings and finishes can be applied to low carbon steel to improve corrosion resistance.

Standard Finishes

Plain, Oiled
The most economical standard finish is a thin coating of oil that provides corrosion resistance during storage and shipping.

ArmorGalv® is a zinc alloy thermal diffusion coating covered by ASTM A1059M-08(2013). SPIROL recommends ArmorGalv® for Spacers for many reasons; chief among them being uniform deposition of coating on all surfaces of the part. There are no insignificant surfaces and the entire inner diameter receives full coating and protection. ArmorGalv® offers a minimum of 1,000 hours of corrosion resistance to red rust, and due to its slightly porous surface, it will retain paint and other coatings in the event that the complete assembly requires subsequent painting, power coating, etc. Compared to some stainless steels, ArmorGalv® is an ideal coating for some of the most aggressive environments such as marine, automotive, mining and industrial manufacturing.

SPIROL is a licensee of ArmorGalv®, a registered trademark of Distek N.A LLC

Special Material

Austenitic Stainless Steel
Austenitic stainless steel provides excellent corrosion protection against normal environmental conditions. It withstands fresh water and atmospheric marine conditions very well, and is suitable for many other industrial conditions including acidic environments.

Aluminum is lightweight, lead free, and has sufficient columnar strength for many non-critical applications. Aluminum is 1/3 the weight of steel, and does not require any supplemental coatings or platings to provide the necessary corrosion protection in most environments.

Electroplated Zinc

This finish consists of a minimum of 5μm (.0002”) thick electrodeposited zinc with a clear trivalent passivation topcoat. Zinc plate is primarily used for cosmetic purposes as this finish yields a bright, silvery appearance on the outside surfaces of the Spacer. Zinc plating is also commonly used to prevent galvanic corrosion. The major drawback to electroplated zinc on Spacers is that coverage on the inner diameter is limited to one diameter’s length of “throw” of the plating. If atmospheric corrosion protection is required throughout the entirety of the part, ArmorGalv® should be considered instead of zinc plate.

Application Success Stories

Local Design, Global Supply.

SPIROL has Application Engineers throughout the world to assist you in your designs, supported by state-of-the-art manufacturing centers and worldwide stocking facilities to simplify the logistics of delivering your product.

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