TECHNICAL STAINLESS STEEL CHEMICAL PROPERTIES A4 A2 • • • • 304L, 321,347 302, 304, 316,316L Suitable to Galling.Moststainlessboltshaverolledthreads

hobson.com.au Bolt Tension | Anti-Vibration | |ProductReliability Traceability Stainless SteelChemicalProperties Suggestions for dealing with galling in stainlessfasteners: with galling Suggestions fordealing ripped out. This lock together. - the actual freezing together of the threads. or If tightening is continued, the fastener can be twisted off or its threads shear high points metal interface leads toseizing In theextreme, galling adhesion. action causesincreasing cumulative clogging–shearing–locking and off, wiped possibly broken, are oxides protective corrosion for film surface oxide an generate surfaces, thread sliding and thecontacting between builds as pressure fastenertightening, During protection. self which alloys other and titanium, aluminum, steel, stainless of with fastenersmade most prevalent by theIndustrialFastenerInstituteasbeing is portrayed Thread galling themʺ. between form can bond male andfemalethreadscomeinsuchclosecontactthatanatomic occurs when process which a coldwelding as jointsʺ, bolted of behaviour and design the to introduction “An book his in Bicford John by described is Galling How tostopGallingonStainlessFasteners Chemical Properties:Galling Stainless Steel TECHNICAL STAINLESS STEEL CHEMICAL PROPERTIES A4 A2 • • • • 304L, 321,347 302, 304, 316,316L Suitable to galling.Moststainlessboltshaverolledthreads. most contributes hence are cut)and (threads thread thread thathastherougher it istheinternal Generally Thread roughness affects galling, the rougher the thread flanks, the greater the likelihood galling will occur. & 316hasalsoshownusefulresults. 400 rates. of 304 combination alternative steel nutsworkwellon316stainlessbolts,andacheaper series stainless different at harden work alloys different because is this hardness, different having materials of mating is here key The galling. reduces nut the and bolt the for grades alloy stainless different Using such asMolykoteorXylanalsoprovideasolutionforgalling. coatings Fastener aluminum. in used are bolts stainless where grease silicon Use disulfide. molybdenum and orexternalthreads. the internal Lubricating amounts of contain substantial should The lubricants rpm. down theinstallation Slowing Alloys 0.08 max 0.08 max Carbon 1.0 max 1.0 max Silicon QUALITYFASTENERS Manganese 2.0 max 2.0 max Phosphorus 0.05 max 0.05 max 0.03 max 0.03 max Sulphur Chromium 16.0-18.5 17.0-20.0 SINCE 1935 Molybdenum 2.0-3.0 - 10.0-14.0 8.0-13.0 Nickel

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