Technical Articles

SPIROL has published these technical articles:

(Fastening and Joining)
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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....
(Fastening and Joining)
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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....
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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The Coiled Pin's tucked seam will allow smooth, interference-free rotation of hinge/axle components in the vast majority of assemblies....
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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This informative document analyzes the differences between heat and ultrasonic installation of Threaded Inserts into plastic assemblies....
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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,...
(Industrial Hardware)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Material Handling Equipment)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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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...
(Fastening and Joining)
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White paper focusing on step-by-step design specifics of a coiled pin and everyday uses....
(Fastening and Joining)
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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....
(Fastening and Joining)
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This White Paper quantifies the effects that clearance between the shear plane has on the strength of a pinned joint....