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Bolting Material

Wiki Common user: Alexander AlUS

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Material of construction

• Carbon steel• Low alloy steel • Stainless steel • Exotic material, such as Monel, Inconel, Nickel

alloy

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Material of construction• These material further divide in

−High Strength−Intermediate strength−Low Strength

• List of ASTM Material grade used for manufacturing stud are given in ASME B16.5

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Materials for Stud & Bolt• Common material grade used are• ASTM A193 Gr B7, B7M, B5, B8 etc.• ASTM A320 Gr L7,L7A,L7B etc. • ASTM A354 Gr BC, BD etc..• ASTM A540 Gr B21 to B24

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Materials for Nut• Nuts may be machined from the same material

as stud or may be of a compatible grade of ASTM A194

• ASTM A194 list the material grades which suit various stud materials

• ASTM A194 Gr 2,2H,2HM,8,8M

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Materials for Washers• Common material grade used are• ASTM F436,ASTM F844, ASTM F959• If not specified it can be manufactured from

any compatible grade material

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Coating • Bolting are also coated with different materials

to improve its corrosion resistance and reduce maintenance −Chrome plated−Galvanized −Xylan coated −PTFE coated

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What you have learned?• Materials for Stud, Bolt,

Nut &washers• Different type of coating

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See you in the next lecture…