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WINTER 2020

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Distributor's Link Magazine Winter 2020 / Vol 43 No1

12 THE DISTRIBUTOR’S

12 THE DISTRIBUTOR’S LINK Rob LaPointe AIM TESTING LABORATORY Rob LaPointe is a noted authority in materials and fastener technology. With extensive experience in the management and science of materials testing laboratories combined with master’s degrees in physics and education, he excels at bringing solutions to the client. Working specifically in the fastener testing industry, he has developed expertise in mechanical, nondestructive, metallurgical and chemical testing. With a background of 20 years in physics education, Rob is effective at communicating complex ideas in a simple and understandable manner, communicating well with clients enabling them to make informed decisions about their products and business. AIM is located at 1920 Cordell Court #101, El Cajon, CA, 92020. Tel: 909-254-1278, email: sales@aimtestlab.com or online at www.aimtestlab.com FASTENER SCIENCE: DETERMINING HARDNESS Fasteners are made from a huge variety of materials to provide them with an even wider range of physical properties such as holding strength, stretch, durability, conductivity and corrosion resistance. Metals, plastics, carbon fiber and ceramics are all used to manufacture fastened connections for the components we hold together. Of all the properties we design, sell or purchase fasteners to meet, hardness is the most fundamental. Hardness is the degree to which a material can be scratched or can scratch another material. All of us have a general concept of this idea. For example, when we think of something soft, we might think of Jell-O, stuffed animals or marshmallows. When we think of hard things, we might think of rocks, metal or precious minerals such as diamonds. In fact, diamonds are one of the hardest known materials. Another rare material – Wurtzite Boron Nitride – has recently been found to be harder than diamond. Diamonds are used extensively in industrial application for cutting and grinding because they can scratch almost everything else. Most fasteners are made from metal, which itself has a huge variety of hardnesses. Lead is quite soft and can be easly deformed or scratched, even by our fingernail. Brass is also quite soft and can be easily bent or scratched, as anyone who has placed too much force on a brass key knows well. On the other end of the spectrum are materials like carbon steel, which can be made to be very hard. Many tools used to cut and shape other metals are made from high carbon steel (around 1% carbon), which has been heat treated to a high hardness such as drill bits or machine cuttng tools. High-strength fasteners such as ASTM A574 socket head cap screws (Figure 3) or class 12.9 metric socket head cap screws are made from medium carbon steel (around 0.5% carbon) that are formed and then hardened through heat treatment. Determining the hardness of a materiel is really quite simple. By using a material with a known hardness that is also harder than the material of which you’re wanting to know the hardness, scratch or indent the softer material with the harder material using a known force. The resulting size of the scratch or indention must then be measured. The size of the indentaton directly correlates to the hardness of the material being tested. FIGURE 1. SOFT MATERIALS LIKE JELL-O ARE EASILY DEFORMED OR SCRATCHED. TECHNICAL ARTICLE FIGURE 2. ROUGH DIAMONDS. ONE OF THE HARDEST KNOWN MATERIALS. CONTINUED ON PAGE 106

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    Sherex Fastening Solutions LLC, has

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    64 THE DISTRIBUTOR’S LINK DISTRIB

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    72 THE DISTRIBUTOR’S LINK SHEAR-L

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    THE DISTRIBUTOR’S LINK 75 SPIROL

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    MID-WEST FASTENER ASSOCIATION - HOL

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    82 THE DISTRIBUTOR’S LINK WORLDWI

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    84 THE DISTRIBUTOR’S LINK TAMPER-

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    90 THE DISTRIBUTOR’S LINK PennEng

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    92 THE DISTRIBUTOR’S LINK NATIONA

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    94 THE DISTRIBUTOR’S LINK Smalley

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    MID-WEST FASTENER ASSOCIATION - HOL

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    102 THE DISTRIBUTOR’S LINK LAUREN

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    104 THE DISTRIBUTOR’S LINK GUY AV

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    LM Products Inc, a trusted partner

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    110 THE DISTRIBUTOR’S LINK JOE DY

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    112 THE DISTRIBUTOR’S LINK BRUNO

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    114 THE DISTRIBUTOR’S LINK COMPUT

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    PAC-WEST FASTENER ASSOCIATION - FAL

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    Field Fastener announced on 12/18/1

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    THE DISTRIBUTOR’S LINK 121

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    124 THE DISTRIBUTOR’S LINK STAFDA

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    126 THE DISTRIBUTOR’S LINK GLOBAL

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    128 THE DISTRIBUTOR’S LINK PENN E

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    SHARING THE DREAM JoAnn Whetsell ha

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    fastenerlinks BRINGING YOU THE FAST

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    fastenerlinks BRINGING YOU THE FAST

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    140 THE DISTRIBUTOR’S LINK ROTORC

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    142 THE DISTRIBUTOR’S LINK DISTRI

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    146 THE DISTRIBUTOR’S LINK SPIROL

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    148 THE DISTRIBUTOR’S LINK WEIGHP

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    150 THE DISTRIBUTOR’S LINK UNLIMI

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    152 THE DISTRIBUTOR’S LINK GROWER

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    154 THE DISTRIBUTOR’S LINK METROP

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    156 THE DISTRIBUTOR’S LINK LAUREN

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    158 THE DISTRIBUTOR’S LINK GUY AV

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    164 THE DISTRIBUTOR’S LINK BRUNO

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    166 THE DISTRIBUTOR’S LINK ROBERT

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    168 THE DISTRIBUTOR’S LINK LARRY

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    STAFDA’s 43rd ANNUAL CONVENTION &

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    PAC-WEST FASTENER ASSOCIATION - FAL

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    PAC-WEST FASTENER ASSOCIATION - FAL

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    advertisers index # ALLOY & STAINLE

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    advertisers index I ICS FLANGE 41 S

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