Thanks to their flexibility, not only are Spring Pins less expensive to manufacture, but the hole preparation is also less tedious and less expensive than Solid Pins. The comparatively lower stiffness...

In applications requiring a combination of high strength, superior fatigue life, and corrosion resistance, 420 martensitic chrome stainless steel offers a host of technical benefits and provides an...

The use of Threaded Inserts in plastic assemblies allow designers to replace machined and cast metal components with plastic to achieve significant cost and weight savings without any loss of joint...

In the 1940s, SPIROL’s founder, Herman Koehl, invented the Coiled Spring Pin to service a need in the aviation industry that couldn’t be met by any other fastener. Throughout the years,...

Tubular Spacers are generally used to separate / space two components from each other by a distance equal to the length of the Spacer. Typically, a Tubular Spacer is used in conjunction with a bolt...

There are many different types of components that are used as spacers, standoffs, or distance bushings. Learn the advantages of using Roll Formed Tubular Spacers over more expensive spacing options....

One of the primary benefits of using a Coiled Spring Pin to affix a hub or gear to a shaft is the Coiled Pin’s ability to prevent hole damage. Another benefit is that the Coiled Pin absorbs...

This White Paper focuses on the recommended hole design for plastic assemblies that use Threaded Inserts installed by heat or ultrasonics to maximize performance....

Solid Pins are commonly used as permanent fasteners in a wide range of applications. They are retained by the harder Solid Pin displacing material in the softer host component(s). This White Paper...

Slotted Spring Pins, sometimes referred to as Roll Pins or Split Pins, are general purpose low cost pins commonly used in various fastening applications. While both SPIROL Standard Slotted Pins and...

While both Disc Springs and Belleville washers may be suitable for your application, they are not always interchangeable. This white paper breaks down some of the important differences, and why a disc...

This White Paper details the specific design differences between both Austenitic Stainless Steel Slotted Spring Pins and Coiled Spring Pins and explains which Spring Pin is best for dynamic loading....

Disc Springs are conically shaped washers designed to provide predictable and repeatable results. This paper focuses on the use of Disc Springs and how to estimate fatigue life in dynamic situations....

In any assembled component there are three ways to reduce the overall cost of the assembly: reduce the cost of the individual components, reduce component preparation cost, and reduce the cost to...

White paper focusing on step-by-step design specifics of a coiled pin and everyday uses....

Easily recognized by its unique 2¼ coil cross section, Coiled Pins are retained by radial tension when installed into the host component, and they are the only pins with uniform strength and...

To achieve optimal alignment when using Coiled Pins, two primary design elements must be adhered to: 1) The hole diameters in the host and mating component must be correctly sized to achieve the...

This White Paper provides the fundamental guidelines for determining the optimum balance between strength and flexibility of the Coiled Spring Pin that will result in the prolonged net life of the...

This paper compares and contrasts the use of various types of spring pins used in soft host materials, and provides valuable information regarding the optimum solution for plastic assemblies....

This White Paper quantifies the effects that clearance between the shear plane has on the strength of a pinned joint....

Compression Limiters are used to protect plastic components in bolted joints and maintain a threaded fastener's clamp load by eliminating plastic creep. To function properly, bearing surface beneath...

Precision Shims are used as compensators to absorb tolerances between mating components. They significantly reduce manufacturing costs by eliminating the need for each component to be precision...

The versatility of Coiled Spring Pins often times makes them the ideal fastener to meet the specific engineering and economic objectives of pinning applications. They are available in a wide variety...

One of the primary benefits of using a Coiled Spring Pin to affix a hub or gear to a shaft is the Coiled Pin's ability to prevent hole damage. Another benefit is that the Coiled Pin absorbs wider hole...

Angular roller bearings and ball bearings in an assembly typically require preloading in order to maintain a minimum designed axial force in the assembly. This minimum force is called the bearing...

The fastener is as important when automating as the automation equipment itself. Choosing the right fastener may prevent exorbitant machine and fixture costs, decrease set-up and cycle times, as well...

The Coiled Pin's tucked seam will allow smooth, interference-free rotation of hinge/axle components in the vast majority of assemblies....

Press fit pins are retained in an assembly by the frictional forces between the pin and its mating host component. These forces are a product of the coefficient of friction between the mating...

In any assembled component there are two ways to reduce the overall cost of the assembly: reduce the cost of the individual components or reduce the cost to assemble the components. The Coiled Pin is...

Assemblies made of plastic or other soft materials often rely on threaded metal inserts to secure fasteners and reinforce joints. Though stainless steel may be appropriate for use in some applications...

What is the real cost of a component? When sourcing a fastener this is often taken as the one that costs less. However, it is not that simple and it has been a question that SPIROL has answered for...

Coiled pin design is such that, diameter will be within specification over a minimum of 270° of the circumference. This design characteristic ensures that diameter at the seam will remain equal to, or...

It has been traditionally thought that passivation is the standard method of cleaning stainless steel; when in fact passivation is not a cleaning process at all. The passivation process removes any...

It is often quicker and less expensive to use a shim, a thin piece of metal or composite, to level a machine tool or make components fit together, than grinding and machining to make the same...

A "Spring Pin" is appropriately named by its ability to flex into a hole that is smaller than the pin's original (pre-installed) outside diameter. A Spring Pin's tendency to return to its original...

There has been a bit of confusion and concern regarding two requirements that have recently become enforced policies; RoHS and DFARS (The Berry Amendment). These two policies may confuse some, but for...

An attempt is made to analyze strain and stress of different types of pins in more detail than the conventional consideration of the shear strength offers. The analysis reveals that there are cases in...

To select the most cost-effective alignment component, Design Engineers must focus on required positional tolerances, cost of secondary operations (reaming/honing holes), overall assembly weight,...

Corrosion of stainless and carbon steel are very different. This paper will provide information regarding general attack or surface corrosion as this is often a primary consideration when selecting...

Even though the application requirements do not justify it, fasteners used in medical devices are usually specified as extremely tightly toleranced parts. In addition, due to the unfamiliarity of the...

This informative document analyzes the differences between heat and ultrasonic installation of Threaded Inserts into plastic assemblies....

There are two primary types of hinges: 1) a free fit hinge has little to no friction or drag when the latch or handle is rotated. Hinge components are "free" to rotate independent of one another, and...

When proper design guidelines are followed, companies can take advantage of the many benefits that Spring Pins offer. They significantly reduce the total cost of the assembly, lower insertion forces...

When installing Coiled Spring Pins, it is important that the installation tool, often called a "quill", is large enough to cover the entire end of the Coiled Pin. The quill should be sized such that...

Fasteners are usually the smallest, least expensive components within an assembly. Even though fasteners usually hold the entire assembly together, they are often overlooked until the end of the...

Shim tooling costs are one of the quickest ways to drive a prototype or short-run production project over budget. SPIROL has several manufacturing methods that eliminate or greatly reduce tooling...

The weakest sections of many plastic part designs are the joints and assembly points. During screw assembly of mating components, the screw has to be tightened with sufficient torque to produce the...

In applications where the mating component is also plastic, a Compression Limiter is necessary to avoid the creep or stress relaxation in the mating component from reducing the frictional load in the...

The past century has been witness to unprecedented changes in industrial manufacturing technology. Advancements in materials, methods, and control systems have led to higher quality, tighter...