Shakeproof Fasteners

1. Friction
is generated at the contact areas of mating threads, the undersurface of the screw head in contact with a work surface, and, if a nut is involved in the assembly, the upper surface of the nut that is in contact with the bottom work surface. Lock washers and bearing washers can enhance surface friction.

Quality
Our mission at Shakeproof is to provide the highest quality, the most cost-effective fasteners and components in conformance with all customer, industry and government requirements and to provide these products on a reliable and timely basis. We will conduct every aspect of our business in an ethical manner that will sustain the trust so essential to successful customer/supplier relations.

At every organizational level, the men and women of ITW Shakeproof are committed to total quality excellence in the design, manufacture and supply of the company's fasteners and components. Inherent in this commitment is a dedication to continuous improvement in every aspect of Shakeproofs's products and operations. At ITW our goal is to create value and improve the operating efficiencies of every one of our customers.

2. Tension
When torque is applied, screw threads have a tendency to advance even after the screw head bottoms against the work surface. Screws or bolts are, in effect, stretched. A steel bolt or screw will elongate approximately .002" per inch of effective length when stressed at 60,000 PSI.

Components beneath the screw head and between the screw and any nut that may be involved, are compressed. Materials have an innate tendency to return to their original form. Like a stretched spring, the extended screw wants to contract. The compressed components want to expand, These conflicting forces generate the tension that keeps assemblies tight. This tension can be enhanced and sustained through the addition of washers - lock washers, conical washers, spring washers and combinations of these - which can be preassembled to screws in the form of Sems.

Initially, the amount of friction and tension generated in an assembly is largely determined by the amount of twisting force, or torque, that can be applied to the thread fastener without stripping out the mating threads. This is, in part, determined by how the mating threads are formed and the nature and thickness of the material in which they are formed. The threaded fasteners in this catalog are represented accordingly.

Fasteners for Standard Panel and Component Thicknesses

Self Drilling Fasteners for Metal

i Thread Cutting Screws - There is a complete family of screws designed to cleanly cut mating threads in metal and plastic. In addition to the Shakeproof Types 1, 23, 25 and 17, types F and BF are available.

Screws for Plastics and Other Low Density Materials

Fastener Assemblies

i SEMS™ Preassembled Screws and Washers - The Sems preassembled screw and washer is another Shakeproof innovation and, consequently, we offer many combinations: tooth lock washers, helical spring washers, conical washers, and other special stampings preassembled to machine screws, thread forming, thread cutting, self-drilling and various other screws.

i Tapping Screws for Thin Gage Metal

Cyclone® Screws - The serrated helical shoulder on the screw actually draws metal up into the undercut head and bites into it, dramatically increasing stripping torque and back-out resistance.

Custom Multi-Die Cold Headed Parts

Multi-die heading capabilities make it possible for Shakeproof to produce custom extruded, uniquely formed one-piece, low cost, cold headed parts.

KEPS Preassembled Nuts and Washers