78 series engineer class sprockets are used for a wide verity of chain sizes. For cast sprockets, these sizes include 75, 78, 88, H78, H79, BRH, 188, C188 conveyor chain, SS188, 78, MXS882, MSR1288, 433-1/2, H74, H75, H78A rooftop chain, H78B rooftop chain, H78SR, BRH188 conveyor chain, MW188RT, 488 pintle chain, SS578, and 81X. For steel sprockets, these sizes include 78, H74, 75, H75, H78LR, H75RT, H78SR, H79, 88, 188, S188, S78, R588, RR588, R778, RR778, 988, IS880, 87R, IS881, 81X, IS882, 433-1/2, LXS881, LXS886, US881, LXS887, LXS882, 488 pintle chain, XS578, SS188, C188 conveyor chain, US278R, US882, 578R, and 588R. These sprockets are typically supplied as cast material but we can also supply them as steel for longer operation.
Cast 78-Series Sprockets
Note: Tooth Face at Pitch Line: 0.937″/ Roller Diameter: 0.875″
| Sprocket Size | Tooth Count | Style | Pitch Diameter | Hub Diameter | Length Thru Bore | Maximum Bore | Weight (LBS) |
|---|---|---|---|---|---|---|---|
| 78C5 | 5 | C | 4.44″ | 2.50″ | 2.50″ | 1.19″ | 5 |
| 78C6 | 6 | C | 5.22″ | 3.50″ | 2.75 “ | 1.44″ | 6 |
| 78C7 | 7 | C | 6.01″ | 4.00″ | 3.00″ | 2.44″ | 11 |
| 78C8 | 8 | C | 6.82″ | 4.75″ | 3.12″ | 2.81″ | 15 |
| 78C9 | 9 | C | 7.63″ | 5.25″ | 3.88″ | 3.25″ | 16 |
| 78C10 | 10 | C | 8.44″ | 5.25″ | 3.88″ | 3.25″ | 19 |
| 78C11 | 11 | C | 9.26″ | 5.25″ | 3.88″ | 3.25″ | 23 |
| 78C12 | 12 | C | 10.08″ | 6.00″ | 3.88″ | 3.25″ | 28 |
| 78C13 | 13 | C | 10.90″ | 6.00″ | 4.50″ | 3.31″ | 36 |
| 78C14 | 14 | C | 11.72″ | 6.00″ | 4.50″ | 3.31″ | 39 |
| 78C15 | 15 | C | 12.55″ | 6.00″ | 4.50″ | 3.31″ | 40 |
| 78C16 | 16 | C | 13.37″ | 6.00″ | 4.50″ | 3.31″ | 53 |
| 78C17 | 17 | C | 14.20″ | 6.00″ | 4.50″ | 3.31″ | 55 |
| 78C18 | 18 | C | 15.02″ | 6.00″ | 4.50″ | 4.06″ | 61 |
| 78C19 | 19 | C | 15.85″ | 6.50″ | 5.38″ | 4.06″ | 64 |
| 78C20 | 20 | C | 16.68″ | 6.50″ | 5.38″ | 4.06″ | 67 |
| 78C21 | 21 | C | 17.50″ | 6.50″ | 5.38″ | 4.06″ | 79 |
| 78C22 | 22 | C | 18.33″ | 6.50″ | 5.38″ | 4.06″ | 89 |
| 78C23 | 23 | C | 19.16″ | 6.50″ | 5.38″ | 4.06″ | 91 |
| 78C24 | 24 | C | 19.99″ | 7.00″ | 5.38″ | 4.06″ | 99 |
| 78C25 | 25 | C | 20.81″ | 7.00″ | 5.38″ | 4.06″ | 107 |
| 78C26 | 26 | C | 21.64″ | 7.00″ | 5.38″ | 4.06″ | 111 |
| 78C27 | 27 | C | 22.47″ | 7.00″ | 5.38″ | 4.06″ | 112 |
| 78C28 | 28 | C | 23.30″ | 7.00″ | 5.38″ | 4.06″ | 114 |
| 78C29 | 29 | C | 24.05″ | 7.00″ | 5.38″ | 4.06″ | 116 |
| 78C30 | 30 | C | 24.96″ | 7.00″ | 5.38″ | 4.06″ | 119 |
| 78C31 | 31 | C | 25.79″ | 7.00″ | 5.38″ | 4.06″ | 123 |
| 78C32 | 32 | C | 26.62″ | 7.00″ | 5.38″ | 4.06″ | 130 |
| 78C33 | 33 | C | 27.38″ | 7.00″ | 5.38″ | 4.06″ | 136 |
| 78C34 | 34 | C | 28.28″ | 7.00″ | 5.38″ | 4.06″ | 141 |
| 78C35 | 35 | C | 29.11″ | 7.00″ | 5.38″ | 4.06″ | 146 |
| 78C36 | 36 | C | 29.93″ | 7.00″ | 5.38″ | 4.06″ | 153 |
| 78C38 | 38 | C | 31.60″ | 7.00″ | 5.38″ | 4.06″ | 162 |
| 78C39 | 39 | C | 32.42″ | 7.00″ | 5.38″ | 4.06″ | 170 |
| 78C40 | 40 | C | 33.25″ | 7.25″ | 6.75″ | 4.62″ | 176 |
| 78C41 | 41 | C | 34.08″ | 7.25″ | 6.75″ | 4.62″ | 180 |
| 78C42 | 42 | C | 34.91″ | 7.25″ | 6.75″ | 4.62″ | 193 |
| 78C43 | 43 | C | 35.65″ | 7.25″ | 6.75″ | 4.62″ | 197 |
| 78C44 | 44 | C | 36.57″ | 7.25″ | 6.75″ | 4.62″ | 202 |
| 78C45 | 45 | C | 37.31″ | 7.25″ | 6.75″ | 4.62″ | 212 |
| 78C46 | 46 | C | 38.23″ | 7.25″ | 6.75″ | 4.62″ | 221 |
| 78C48 | 48 | C | 38.89″ | 7.25″ | 6.75″ | 4.62″ | 449 |
| 78C54 | 54 | C | 44.87″ | 7.25″ | 6.75″ | 4.62″ | 265 |
Steel 78-Series Sprockets
Note: Pitch: 2.609″/ Plate Thickness: 0.875″/ Roller Diameter: 0.875″
| ket Size | Tooth Count | Style | Pitch Diameter | Stock Bore | Maximum Bore | Hub Diameter | Length Through Bore | Weight (LBS) |
|---|---|---|---|---|---|---|---|---|
| 78C8 | 8 | C | 6.82″ | 0.938″ | 3.25 | 4.75 | 3.125 | 21 |
| 78C9 | 9 | C | 7.63″ | 1.25″ | 3.438″ | 5.25″ | 3.875″ | 29 |
| 78C10 | 10 | C | 8.44″ | 1.25″ | 3.438″ | 5.25″ | 3.875″ | 31 |
| 78C11 | 11 | C | 9.26″ | 1.25″ | 3.438″ | 5.25″ | 3.875″ | 34 |
| 78C12 | 12 | C | 10.08″ | 1.25″ | 3.438″ | 5.25″ | 3.875″ | 37 |
| 78C13 | 13 | C | 10.90″ | 1.25″ | 3.75″ | 5.5″ | 4.5″ | 46 |
| 78C14 | 14 | C | 11.72″ | 1.25″ | 3.75″ | 5.5″ | 4.5″ | 49 |
| 78C15 | 15 | C | 12.55″ | 1.5″ | 3.75″ | 5.5″ | 4.5″ | 53 |
| 78C17 | 17 | C | 14.20″ | 1.5″ | 3.75″ | 5.5″ | 4.5″ | 62 |
| 78C19 | 19 | C | 15.85″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 90 |
| 78C21 | 21 | C | 17.51″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 101 |
| 78C24 | 24 | C | 19.99″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 119 |
| 78C25 | 25 | C | 20.82″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 124 |
| 78C28 | 28 | C | 23.31″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 132 |
| 78C30 | 30 | C | 24.96″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 150 |
| 78C35 | 35 | C | 29.11″ | 1.5″ | 4.5″ | 6.5″ | 5.375″ | 170 |
| 78C40 | 40 | C | 33.25″ | 1.5″ | 4.938″ | 7.25″ | 6.75″ | 226 |
| 78C42 | 42 | C | 34.91″ | 1.5″ | 4.938″ | 7.25″ | 6.75″ | 240 |
| 78C46 | 46 | C | 38.31″ | 1.5″ | 4.938″ | 7.25″ | 6.75″ | 258 |
| 78C54 | 54 | C | 44.87″ | 1.5″ | 4.938″ | 7.25″ | 6.75″ | 368 |
| 78C60 | 60 | C | 49.85″ | 1.5″ | 4.938″ | 7.25″ | 6.75″ | 388 |
| 78A8 | 8 | A | 6.82″ | 0.938″ | – | – | – | 9.0 |
| 78A9 | 9 | A | 7.63″ | 1.25″ | – | – | – | 11.3 |
| 78A10 | 10 | A | 8.44″ | 1.25″ | – | – | – | 13.9 |
| 78A11 | 11 | A | 9.26″ | 1.25″ | – | – | – | 16.7 |
| 78A12 | 12 | A | 10.08″ | 1.25″ | – | – | – | 19.8 |
| 78A13 | 13 | A | 10.90″ | 1.25″ | – | – | – | 23.0 |
| 78A14 | 14 | A | 11.72″ | 1.25″ | – | – | – | 27.0 |
| 78A15 | 15 | A | 12.55″ | 1.5″ | – | – | – | 30.0 |
| 78A17 | 17 | A | 14.20″ | 1.5″ | – | – | – | 39.0 |
| 78A19 | 19 | A | 15.85″ | 1.5″ | – | – | – | 50.0 |
| 78A21 | 21 | A | 17.51″ | 1.5″ | – | – | – | 61.0 |
| 78A24 | 24 | A | 19.99″ | 1.5″ | – | – | – | 79.0 |
| 78A25 | 25 | A | 20.82″ | 1.5″ | – | – | – | 84.0 |
| 78A28 | 28 | A | 23.31″ | 1.5″ | – | – | – | 105.0 |
| 78A30 | 30 | A | 24.96″ | 1.5″ | – | – | – | 123.0 |
| 78A35 | 35 | A | 29.11″ | 1.5″ | – | – | – | 166.0 |
| 78A40 | 40 | A | 33.25″ | 1.5″ | – | – | – | 216.0 |
| 78A42 | 42 | A | 34.91″ | 1.5″ | – | – | – | 240.0 |
| 78A46 | 46 | A | 38.31″ | 1.5″ | – | – | – | 286.0 |
| 78A54 | 54 | A | 44.87″ | 1.5″ | – | – | – | 302.0 |
| 78A60 | 60 | A | 49.85″ | 1.5″ | – | – | – | 322.0 |