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Chiaravalli CH-G A 503 helical gear unit (chiaravalli.com product image)
Chiaravalli

CH-G A 503 Helical Gear Unit (Ø50 mm output shaft)

Cast Iron Gearboxes CH-G

CH-G A 503 helical in-line gear unit — Chiaravalli's cast iron series: three-stage, size 50, ratios 56.21:1 to 222.59:1. This is the A … / PAM version — foot mounting with the PAM motor input — the version the catalogue lists as available from stock. Solid keyed output shaft Ø50 k6. The flange-mounted F and foot-flange AF versions, the W input-shaft and IEC-coupling input versions and the FA–FD output flanges are made to order — ask us. PAM motor input for IEC 80, 90, 100, 112, 132 motors.

Supplied without motor. You are choosing the gear unit with its PAM motor adapter — ask us to quote a suitable motor together with it if you'd like both.

How to pick from the table: with a standard 4-pole motor (1400 r/min) the ratio sets the output speed — e.g. ratio 222.59:1 gives 6 r/min at the output shaft. Each row shows the catalogue's maximum output torque (M2max at service factor 1) and the largest 4-pole motor that reaches it (P1max, 1.19 to 4.17 kW on this size). Choose the row whose output speed and torque match your application, then the flange that matches your motor (the frame size is on the motor's nameplate — only the frames the catalogue lists for that ratio are offered). The Motor column lists the 4-pole motors that fit that flange — pick yours and the output torque and service factor update to match. FR1 / FR2 are the permissible radial loads on the input and output shafts. More in the Selection Guide tab below.

Mounting position M1 is standard — specify yours when ordering (see the mounting-positions image). Cast iron housing.

Product Configuration

Select a row to add it to your quote

Code RatioMotor flangeMotorOutput speedOutput torqueService factorRadial load FR1Radial load FR2 Weight
CH-G A503 222.59 PAM80 222.59:1 IEC 80 · 19 mm shaft 1.1 kW 6.3 r/min 1664 Nm 1.08 2.9 kN 18 kN 52.0 kg
CH-G A503 222.59 PAM90 222.59:1 IEC 90 · 24 mm shaft 1.1 kW 6.3 r/min 1664 Nm 1.08 2.9 kN 18 kN 52.0 kg
CH-G A503 194.86 PAM80 194.86:1 IEC 80 · 19 mm shaft 1.1 kW 7.2 r/min 1467 Nm 1.23 2.9 kN 18 kN 52.0 kg
CH-G A503 194.86 PAM90 194.86:1 IEC 90 · 24 mm shaft 1.1 kW 7.2 r/min 1467 Nm 1.23 2.9 kN 18 kN 52.0 kg
CH-G A503 178.98 PAM80 178.98:1 IEC 80 · 19 mm shaft 1.1 kW 7.8 r/min 1347 Nm 1.34 2.8 kN 18 kN 52.0 kg
CH-G A503 178.98 PAM90 178.98:1 IEC 90 · 24 mm shaft 1.1 kW 7.8 r/min 1347 Nm 1.34 2.8 kN 18 kN 52.0 kg
CH-G A503 162.21 PAM80 162.21:1 IEC 80 · 19 mm shaft 1.1 kW 8.6 r/min 1215 Nm 1.48 2.8 kN 18 kN 52.0 kg
CH-G A503 162.21 PAM90 162.21:1 IEC 90 · 24 mm shaft 1.5 kW 8.6 r/min 1656 Nm 1.09 2.8 kN 18 kN 52.0 kg
CH-G A503 154.52 PAM80 154.52:1 IEC 80 · 19 mm shaft 1.1 kW 9.1 r/min 1158 Nm 1.55 2.8 kN 18 kN 52.0 kg
CH-G A503 154.52 PAM90 154.52:1 IEC 90 · 24 mm shaft 1.5 kW 9.1 r/min 1579 Nm 1.14 2.8 kN 18 kN 52.0 kg
CH-G A503 154.52 PAM100 154.52:1 IEC 100 · 28 mm shaft 2.2 kW 9.1 r/min 2316 Nm 0.78 2.8 kN 18 kN 54.0 kg
CH-G A503 154.52 PAM112 154.52:1 IEC 112 · 28 mm shaft 4 kW 9.1 r/min 4211 Nm 0.43 2.8 kN 18 kN 54.0 kg
CH-G A503 154.52 PAM132 154.52:1 IEC 132 · 38 mm shaft 5.5 kW 9.1 r/min 5789 Nm 0.31 2.8 kN 18 kN 58.0 kg
CH-G A503 142 PAM80 142:1 IEC 80 · 19 mm shaft 1.1 kW 9.9 r/min 1065 Nm 1.69 2.8 kN 18 kN 52.0 kg
CH-G A503 142 PAM90 142:1 IEC 90 · 24 mm shaft 1.5 kW 9.9 r/min 1452 Nm 1.24 2.8 kN 18 kN 52.0 kg
CH-G A503 142 PAM100 142:1 IEC 100 · 28 mm shaft 2.2 kW 9.9 r/min 2129 Nm 0.85 2.8 kN 18 kN 54.0 kg
CH-G A503 142 PAM112 142:1 IEC 112 · 28 mm shaft 4 kW 9.9 r/min 3871 Nm 0.47 2.8 kN 18 kN 54.0 kg
CH-G A503 124.25 PAM80 124.25:1 IEC 80 · 19 mm shaft 1.1 kW 11.3 r/min 934 Nm 1.93 2.8 kN 18 kN 52.0 kg
CH-G A503 124.25 PAM90 124.25:1 IEC 90 · 24 mm shaft 1.5 kW 11.3 r/min 1274 Nm 1.41 2.8 kN 18 kN 52.0 kg
CH-G A503 124.25 PAM100 124.25:1 IEC 100 · 28 mm shaft 2.2 kW 11.3 r/min 1868 Nm 0.96 2.8 kN 18 kN 54.0 kg
CH-G A503 124.25 PAM112 124.25:1 IEC 112 · 28 mm shaft 4 kW 11.3 r/min 3396 Nm 0.53 2.8 kN 18 kN 54.0 kg
CH-G A503 124.25 PAM132 124.25:1 IEC 132 · 38 mm shaft 5.5 kW 11.3 r/min 4670 Nm 0.39 2.8 kN 18 kN 58.0 kg
CH-G A503 112.61 PAM80 112.61:1 IEC 80 · 19 mm shaft 1.1 kW 12.4 r/min 846 Nm 2.13 2.7 kN 18 kN 52.0 kg
CH-G A503 112.61 PAM90 112.61:1 IEC 90 · 24 mm shaft 2.2 kW 12.4 r/min 1692 Nm 1.06 2.7 kN 18 kN 52.0 kg
CH-G A503 112.61 PAM100 112.61:1 IEC 100 · 28 mm shaft 2.2 kW 12.4 r/min 1692 Nm 1.06 2.7 kN 18 kN 54.0 kg
CH-G A503 112.61 PAM112 112.61:1 IEC 112 · 28 mm shaft 4 kW 12.4 r/min 3077 Nm 0.59 2.7 kN 18 kN 54.0 kg
CH-G A503 112.61 PAM132 112.61:1 IEC 132 · 38 mm shaft 5.5 kW 12.4 r/min 4231 Nm 0.43 2.7 kN 18 kN 58.0 kg
CH-G A503 97.8 PAM80 97.8:1 IEC 80 · 19 mm shaft 1.1 kW 14.3 r/min 733 Nm 2.45 2.7 kN 18 kN 52.0 kg
CH-G A503 97.8 PAM90 97.8:1 IEC 90 · 24 mm shaft 2.2 kW 14.3 r/min 1467 Nm 1.23 2.7 kN 18 kN 52.0 kg
CH-G A503 97.8 PAM100 97.8:1 IEC 100 · 28 mm shaft 2.2 kW 14.3 r/min 1467 Nm 1.23 2.7 kN 18 kN 54.0 kg
CH-G A503 97.8 PAM112 97.8:1 IEC 112 · 28 mm shaft 4 kW 14.3 r/min 2667 Nm 0.68 2.7 kN 18 kN 54.0 kg
CH-G A503 97.8 PAM132 97.8:1 IEC 132 · 38 mm shaft 5.5 kW 14.3 r/min 3667 Nm 0.49 2.7 kN 18 kN 58.0 kg
CH-G A503 85.33 PAM80 85.33:1 IEC 80 · 19 mm shaft 1.1 kW 16.4 r/min 641 Nm 2.81 2.7 kN 18 kN 52.0 kg
CH-G A503 85.33 PAM90 85.33:1 IEC 90 · 24 mm shaft 2.2 kW 16.4 r/min 1282 Nm 1.4 2.7 kN 18 kN 52.0 kg
CH-G A503 85.33 PAM100 85.33:1 IEC 100 · 28 mm shaft 3 kW 16.4 r/min 1748 Nm 1.03 2.7 kN 18 kN 54.0 kg
CH-G A503 85.33 PAM112 85.33:1 IEC 112 · 28 mm shaft 4 kW 16.4 r/min 2330 Nm 0.77 2.7 kN 18 kN 54.0 kg
CH-G A503 85.33 PAM132 85.33:1 IEC 132 · 38 mm shaft 5.5 kW 16.4 r/min 3204 Nm 0.56 2.7 kN 18 kN 58.0 kg
CH-G A503 78.64 PAM80 78.64:1 IEC 80 · 19 mm shaft 1.1 kW 17.8 r/min 589 Nm 3.05 2.6 kN 18 kN 52.0 kg
CH-G A503 78.64 PAM90 78.64:1 IEC 90 · 24 mm shaft 2.2 kW 17.8 r/min 1179 Nm 1.53 2.6 kN 18 kN 52.0 kg
CH-G A503 78.64 PAM100 78.64:1 IEC 100 · 28 mm shaft 3 kW 17.8 r/min 1607 Nm 1.12 2.6 kN 18 kN 54.0 kg
CH-G A503 78.64 PAM112 78.64:1 IEC 112 · 28 mm shaft 4 kW 17.8 r/min 2143 Nm 0.84 2.6 kN 18 kN 54.0 kg
CH-G A503 78.64 PAM132 78.64:1 IEC 132 · 38 mm shaft 5.5 kW 17.8 r/min 2946 Nm 0.61 2.6 kN 18 kN 58.0 kg
CH-G A503 71.27 PAM80 71.27:1 IEC 80 · 19 mm shaft 1.1 kW 19.6 r/min 535 Nm 3.36 2.6 kN 18 kN 52.0 kg
CH-G A503 71.27 PAM90 71.27:1 IEC 90 · 24 mm shaft 2.2 kW 19.6 r/min 1070 Nm 1.68 2.6 kN 18 kN 52.0 kg
CH-G A503 71.27 PAM100 71.27:1 IEC 100 · 28 mm shaft 3 kW 19.6 r/min 1459 Nm 1.23 2.6 kN 18 kN 54.0 kg
CH-G A503 71.27 PAM112 71.27:1 IEC 112 · 28 mm shaft 4 kW 19.6 r/min 1946 Nm 0.93 2.6 kN 18 kN 54.0 kg
CH-G A503 71.27 PAM132 71.27:1 IEC 132 · 38 mm shaft 5.5 kW 19.6 r/min 2676 Nm 0.67 2.6 kN 18 kN 58.0 kg
CH-G A503 56.21 PAM80 56.21:1 IEC 80 · 19 mm shaft 1.1 kW 24.9 r/min 422 Nm 3.79 2.5 kN 18 kN 52.0 kg
CH-G A503 56.21 PAM90 56.21:1 IEC 90 · 24 mm shaft 2.2 kW 24.9 r/min 844 Nm 1.9 2.5 kN 18 kN 52.0 kg
CH-G A503 56.21 PAM100 56.21:1 IEC 100 · 28 mm shaft 3 kW 24.9 r/min 1151 Nm 1.39 2.5 kN 18 kN 54.0 kg
CH-G A503 56.21 PAM112 56.21:1 IEC 112 · 28 mm shaft 4 kW 24.9 r/min 1535 Nm 1.04 2.5 kN 18 kN 54.0 kg
CH-G A503 56.21 PAM132 56.21:1 IEC 132 · 38 mm shaft 5.5 kW 24.9 r/min 2110 Nm 0.76 2.5 kN 18 kN 58.0 kg

Product Information

Motor pole count

All table figures assume a 4-pole motor (1400 r/min input) — the standard choice for most applications. A 2-pole motor (2800 r/min) doubles the output speed and a 6-pole motor (900 r/min) reduces it, and the power and torque ratings change with them — if you're running anything other than 4-pole, contact us and we'll size it for you.

Service factor — the number that decides how long your gearbox lives

It's the safety margin between what the gearbox can handle and what the motor asks of it: 1.0 means the gearbox works exactly at its rated limit (the catalogue's M2max); higher means reserve capacity — a cooler, quieter drive and a much longer life. As a guide: smooth, steady loads (light conveyors, centrifugal pumps) are fine near 1.0; moderate loads (heavier conveyors, packing machines) deserve 1.3 or more; heavy duty (mixers, bucket elevators, frequent starts, long running hours) should sit at 1.5–2.0.

If the service factor turns red after you pick a motor, that combination is below 1.0 — the motor can overload the gearbox in continuous use. It may be acceptable for light, intermittent duty, but for anything continuous choose a smaller motor, a different ratio, or the next gearbox size up — or ask us and we'll size it with you.

Radial loads

FR1 is the permissible radial load on the input shaft and FR2 on the output shaft (kN, applied at the shaft centre). Chain sprockets, belt pulleys and gears on the shaft all load it radially — check the figure against your drive, and ask us if your load is close to it. The catalogue also limits peak loads to 200 % of the nominal torque.

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