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Conveyor Chain Selection Operating Speeds, Service Factors and Friction Coefficients The tables shown below provide information regarding allowable chain speeds, service factors, friction coefficients and other information that will be necessary for proper chain selection. Ta b l e 1 : G e n e r a l E n g i n e e r i n g C h a r a c t e r i s t i c s Engineering Characteristics Chain Type Weight Operat. Pitch Range Excluding Speeds (inches) Attach. (ft/min) (lbs) 10-200 1.654-24.000 3.0-31.5 2,100-21,300 fr = (ID / OD) x fs Where: Allowable Tension (lbs) Roller Conv. When both the roller OD and ID are known we may use the following equation to determine it: Steel Bushed 10-150 2.609-7.000 3.8-31.0 2,750-21,800 Combination 10-75 2.609-6.050 2.2-13.4 1,400-11,250 Welded Steel 10-100 2.609-6.050 4.0-20.0 3,000-20,000 Welded Drag 10-100 5.000-8.000 8.6-19.8 8,500-15,000 Drop Forged 10-75 3.015-6.031 2.2-6.7 2,600-7,100 Bar-Pin 10-50 4.000-12.000 5.1-33.0 Consult Hitachi Ta b l e 2 : S l i d i n g F r i c t i o n C o e f fi c i e n t ( f s ) of Various Materials Coefficient of Friction Material Type Dry Lubricated Steel on Steel 0.33 0.20 Cast Iron on Steel 0.50 0.30 Cast Iron on Cast Iron 0.50 0.40 Cast Steel on Cast Steel 0.50 0.15 Steel on Hardwood 0.35 0.25 Steel on UHMW Plastic 0.25 0.15 Ta b l e 4 : S l i d i n g C o e f fi c i e n t ( f s ) o f Va r i o u s M a t e r i a l s i n a S t e e l Tr o u g h Aluminum Ashes Dry Wet Bagasse Beans Cement Portland Clinker Coal Anthracite Run of Mine Pea Buckwheat Coal Bituminous Sized Run of Mine Slack Dry Slack Wet Sized Coke Mixed Breeze 0.40 0.50 0.60 0.40 0.30 0.65 0.70 0.30 0.40 0.45 0.55 0.55 0.60 0.50 0.70 0.40 0.60 0.65 Cottonseed Grains Gravel Dry Screened Run of Bank Ice Crushed Cakes Lime Ground Pebble Sand Dry Shakeout Tempered Sawdust Stonedust Stone Screened Lumps Fines Wood Chips 0.35 0.40 0.45 0.45 0.60 0.20 0.10 0.40 0.50 0.60 0.70 0.85 0.40 0.50 0.60 0.65 0.65 0.40 0.40 - ID = Roller Inside Diameter OD = Roller Diameter fs = Sliding Friction Coefficient between materials of chain roller ID and chain bushing OD (see Table 2) Steel on Bronze Ta b l e 3 : R o l l i n g F r i c t i o n C o e f fi c i e n t ( f r ) by Various Diameters Coefficient of Friction Roller Diameter Dry Lubricated 1-1/2 0.22 0.16 Ta b l e 5 : R e c o m m e n d e d M a x i m u m C h a i n Speeds - Feet Per Minute (FPM) Chain Pitch Number of Sprocket Teeth 4 6 9 12 18 6 180 145 120 105 85 7 210 170 140 120 100 8 240 195 160 140 115 1 0.20 0.15 9 270 220 180 155 125 2-1/2 0.16 0.12 10 300 245 200 175 140 3 0.14 0.09 11 330 270 220 190 155 4 0.12 0.08 12 360 295 240 205 170 5 0.11 0.07 13 390 320 260 225 185 6 0.10 0.06 14 420 345 280 240 200 Roller Bearing 0.05 0.02 15 450 365 300 260 210 Ball Bearing 0.03 0.01 25