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WINTER 2020

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Distributor's Link Magazine Winter 2020 / Vol 43 No1

10 THE DISTRIBUTOR’S

10 THE DISTRIBUTOR’S LINK Guy Avellon Guy Avellon has been in MRO and Fastener Distribution for over 30 years, in such positions Sales Engineer, Chief Engineer, Manager of Product Marketing, Product Engineering & Quality and Director of Quality & Engineering. He founded GT Technical Consultants where he performs failure analysis, lectures on fastener safety, works for law firms and designs/audits Quality systems. He is a member of SAE, is Vice Chairman of the ASTM F16 Fastener Committee, Chairman of the F16.01 Test Methods Committee and received the ASTM Award of Merit in 2005. Guy can be contacted at 847- 477-5057, Email: ExpertBoltGuy@gmail.com or visit www.BoltFailure.com. WHAT FASTENER DISTRIBUTORS NEED TO KNOW ABOUT METAL COATINGS The original use of a metallic coating was to enhance the appearance of the part it was covering. Such was the use of silver, gold, nickel, chromium and copper. Then it was learned that certain coatings also protected the base metals from atmospheric corrosion; some better than others and by different means. All steel fasteners have some type of protective coating on them, if even it is only a thin film of oil to protect the bare steel in shipping or in transition to become coated by another process. This is generally identified by the words ‘as received’. Today, there are a variety of coatings that will enhance the part’s appearance, improve its corrosion resistance or control the torque-tension resistance during assembly. Zinc This is a metal that provides a sacrificial barrier between the substrate (bare metal part) and atmospheric corrosion. In other words, it will corrode first, thereby protecting the steel part. It is applied to fasteners in several ways; hot dip, mechanical deposition, electroplated or by chemical conversion. When corrosion begins, it will produce a white corrosion product. Hot Dip Galvanizing During this process, parts are dragged through a bath of molten zinc. Since the temperatures are over 800˚F (427º C) for the molten zinc, it would greatly affect the tempering temperature of a Grade 8 fastener more than a Grade 5. Therefore, this process is limited to structural CONTRIBUTOR ARTICLE A325, A307, dome head bolts and transmission tower bolts, as well as a variety of pipe and iron flanges. The A325 structural fastener is allowed the hot dip galvanizing per ASTM B695, Class 55. No other fasteners with higher tensile strengths greater than 125 ksi may have a HDG coating. When applied to nuts, the threads are tapped after coating. Coating thicknesses are very thick; from 10 to 30 times that of an electroplated zinc fastener. Averaging over 0.005 inches its corrosion protection is extremely good in outdoor use by virtue of its heavy thickness. See ASTM F2329. Mechanical Zinc Galvanizing This is another process that produces a heavy coating but without high temperatures. Because it is a mechanical process using slurry of zinc metal flakes being impinged onto the parts by glass or metal beads, there is nothing in the process to promote hydrogen embrittlement. Thicknesses can be controlled and varies from 0.0003” to 0.005”. The resultant finish will be a dull matte or hammer tone metallic zinc. This process is used extensively for hardened flat washers to prevent hydrogen assisted cracking. However, it has not been qualified for ASTM A490/490M structural bolts. Chemical Conversions These are also called phosphate coatings and are the only coating that will actually react and combine with the substrate. CONTINUED ON PAGE 104

  • Page 6 and 7: in the Winter 2020 issue of 6 DISTR
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    Sherex Fastening Solutions LLC, has

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    64 THE DISTRIBUTOR’S LINK DISTRIB

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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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    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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    124 THE DISTRIBUTOR’S LINK STAFDA

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    126 THE DISTRIBUTOR’S LINK GLOBAL

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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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    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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    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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