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Chiaravalli CH-G D 503 shaft mounted gear unit (chiaravalli.com product image)
Chiaravalli

CH-G D 503 Shaft Mounted Gear Unit (Ø50 mm hollow output shaft)

Cast Iron Gearboxes CH-G

CH-G D 503 parallel shaft mounted gear unit — Chiaravalli's cast iron series: three-stage, size 50, ratios 74.45:1 to 394.32:1. Hollow output shaft Ø50 mm H7 (D version; the M version has a solid shaft). Made to order: the catalogue lists every D/M version (B14 or B5 flange, KS shrink disc, LT rubber buffer, Ç fixing element, M solid shaft) as available on request — ask us for the lead time. Backstop device available on request (specify the free direction of rotation). PAM motor input for IEC 71, 80, 90, 100, 112 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 394.32:1 gives 4 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, 0.62 to 3.29 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 FR2GRRadial load FR2 Weight
CH-G D503 394.32 PAM71 394.32:1 IEC 71 · 14 mm shaft 0.55 kW 3.6 r/min 1419 Nm 1.13 2.9 kN 22 kN 9 kN 45.0 kg
CH-G D503 394.32 PAM80 394.32:1 IEC 80 · 19 mm shaft 0.55 kW 3.6 r/min 1419 Nm 1.13 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 394.32 PAM90 394.32:1 IEC 90 · 24 mm shaft 1.1 kW 3.6 r/min 2839 Nm 0.56 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 345.35 PAM71 345.35:1 IEC 71 · 14 mm shaft 0.55 kW 4.1 r/min 1239 Nm 1.29 2.9 kN 22 kN 9 kN 45.0 kg
CH-G D503 345.35 PAM80 345.35:1 IEC 80 · 19 mm shaft 0.55 kW 4.1 r/min 1239 Nm 1.29 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 345.35 PAM90 345.35:1 IEC 90 · 24 mm shaft 1.1 kW 4.1 r/min 2479 Nm 0.65 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 320.49 PAM71 320.49:1 IEC 71 · 14 mm shaft 0.55 kW 4.4 r/min 1158 Nm 1.38 2.9 kN 22 kN 9 kN 45.0 kg
CH-G D503 320.49 PAM80 320.49:1 IEC 80 · 19 mm shaft 0.75 kW 4.4 r/min 1579 Nm 1.01 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 320.49 PAM90 320.49:1 IEC 90 · 24 mm shaft 1.1 kW 4.4 r/min 2316 Nm 0.69 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 274.13 PAM71 274.13:1 IEC 71 · 14 mm shaft 0.55 kW 5.1 r/min 989 Nm 1.62 2.9 kN 22 kN 9 kN 45.0 kg
CH-G D503 274.13 PAM80 274.13:1 IEC 80 · 19 mm shaft 0.75 kW 5.1 r/min 1348 Nm 1.19 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 274.13 PAM90 274.13:1 IEC 90 · 24 mm shaft 1.1 kW 5.1 r/min 1978 Nm 0.81 2.9 kN 22 kN 9 kN 48.0 kg
CH-G D503 274.13 PAM100 274.13:1 IEC 100 · 28 mm shaft 2.2 kW 5.1 r/min 3955 Nm 0.4 2.9 kN 22 kN 9 kN 50.0 kg
CH-G D503 274.13 PAM112 274.13:1 IEC 112 · 28 mm shaft 4 kW 5.1 r/min 7191 Nm 0.22 2.9 kN 22 kN 9 kN 50.0 kg
CH-G D503 222.8 PAM71 222.8:1 IEC 71 · 14 mm shaft 0.55 kW 6.3 r/min 800 Nm 2 2.8 kN 22 kN 9 kN 45.0 kg
CH-G D503 222.8 PAM80 222.8:1 IEC 80 · 19 mm shaft 1.1 kW 6.3 r/min 1600 Nm 1 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 222.8 PAM90 222.8:1 IEC 90 · 24 mm shaft 1.1 kW 6.3 r/min 1600 Nm 1 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 222.8 PAM100 222.8:1 IEC 100 · 28 mm shaft 2.2 kW 6.3 r/min 3200 Nm 0.5 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 222.8 PAM112 222.8:1 IEC 112 · 28 mm shaft 4 kW 6.3 r/min 5818 Nm 0.28 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 203.06 PAM71 203.06:1 IEC 71 · 14 mm shaft 0.55 kW 6.9 r/min 727 Nm 2.2 2.8 kN 22 kN 9 kN 45.0 kg
CH-G D503 203.06 PAM80 203.06:1 IEC 80 · 19 mm shaft 1.1 kW 6.9 r/min 1455 Nm 1.1 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 203.06 PAM90 203.06:1 IEC 90 · 24 mm shaft 1.1 kW 6.9 r/min 1455 Nm 1.1 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 203.06 PAM100 203.06:1 IEC 100 · 28 mm shaft 2.2 kW 6.9 r/min 2909 Nm 0.55 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 203.06 PAM112 203.06:1 IEC 112 · 28 mm shaft 4 kW 6.9 r/min 5289 Nm 0.3 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 173.97 PAM71 173.97:1 IEC 71 · 14 mm shaft 0.55 kW 8 r/min 624 Nm 2.56 2.8 kN 22 kN 9 kN 45.0 kg
CH-G D503 173.97 PAM80 173.97:1 IEC 80 · 19 mm shaft 1.1 kW 8 r/min 1248 Nm 1.28 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 173.97 PAM90 173.97:1 IEC 90 · 24 mm shaft 1.1 kW 8 r/min 1248 Nm 1.28 2.8 kN 22 kN 9 kN 48.0 kg
CH-G D503 173.97 PAM100 173.97:1 IEC 100 · 28 mm shaft 2.2 kW 8 r/min 2496 Nm 0.64 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 173.97 PAM112 173.97:1 IEC 112 · 28 mm shaft 4 kW 8 r/min 4539 Nm 0.35 2.8 kN 22 kN 9 kN 50.0 kg
CH-G D503 141.39 PAM71 141.39:1 IEC 71 · 14 mm shaft 0.55 kW 9.9 r/min 509 Nm 3.15 2.7 kN 22 kN 9 kN 45.0 kg
CH-G D503 141.39 PAM80 141.39:1 IEC 80 · 19 mm shaft 1.1 kW 9.9 r/min 1017 Nm 1.57 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 141.39 PAM90 141.39:1 IEC 90 · 24 mm shaft 1.5 kW 9.9 r/min 1387 Nm 1.15 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 141.39 PAM100 141.39:1 IEC 100 · 28 mm shaft 2.2 kW 9.9 r/min 2035 Nm 0.79 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 141.39 PAM112 141.39:1 IEC 112 · 28 mm shaft 4 kW 9.9 r/min 3699 Nm 0.43 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 128.86 PAM71 128.86:1 IEC 71 · 14 mm shaft 0.55 kW 10.9 r/min 463 Nm 3.45 2.7 kN 22 kN 9 kN 45.0 kg
CH-G D503 128.86 PAM80 128.86:1 IEC 80 · 19 mm shaft 1.1 kW 10.9 r/min 926 Nm 1.73 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 128.86 PAM90 128.86:1 IEC 90 · 24 mm shaft 1.5 kW 10.9 r/min 1263 Nm 1.27 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 128.86 PAM100 128.86:1 IEC 100 · 28 mm shaft 2.2 kW 10.9 r/min 1853 Nm 0.86 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 128.86 PAM112 128.86:1 IEC 112 · 28 mm shaft 4 kW 10.9 r/min 3368 Nm 0.48 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 110.73 PAM71 110.73:1 IEC 71 · 14 mm shaft 0.55 kW 12.6 r/min 398 Nm 4.02 2.7 kN 22 kN 9 kN 45.0 kg
CH-G D503 110.73 PAM80 110.73:1 IEC 80 · 19 mm shaft 1.1 kW 12.6 r/min 796 Nm 2.01 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 110.73 PAM90 110.73:1 IEC 90 · 24 mm shaft 2.2 kW 12.6 r/min 1593 Nm 1 2.7 kN 22 kN 9 kN 48.0 kg
CH-G D503 110.73 PAM100 110.73:1 IEC 100 · 28 mm shaft 2.2 kW 12.6 r/min 1593 Nm 1 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 110.73 PAM112 110.73:1 IEC 112 · 28 mm shaft 4 kW 12.6 r/min 2896 Nm 0.55 2.7 kN 22 kN 9 kN 50.0 kg
CH-G D503 100.51 PAM80 100.51:1 IEC 80 · 19 mm shaft 1.1 kW 13.9 r/min 721 Nm 2.22 2.6 kN 22 kN 9 kN 48.0 kg
CH-G D503 100.51 PAM90 100.51:1 IEC 90 · 24 mm shaft 2.2 kW 13.9 r/min 1443 Nm 1.11 2.6 kN 22 kN 9 kN 48.0 kg
CH-G D503 100.51 PAM100 100.51:1 IEC 100 · 28 mm shaft 2.2 kW 13.9 r/min 1443 Nm 1.11 2.6 kN 22 kN 9 kN 50.0 kg
CH-G D503 100.51 PAM112 100.51:1 IEC 112 · 28 mm shaft 4 kW 13.9 r/min 2623 Nm 0.61 2.6 kN 22 kN 9 kN 50.0 kg
CH-G D503 81.69 PAM80 81.69:1 IEC 80 · 19 mm shaft 1.1 kW 17.1 r/min 585 Nm 2.74 2.6 kN 22 kN 9 kN 48.0 kg
CH-G D503 81.69 PAM90 81.69:1 IEC 90 · 24 mm shaft 2.2 kW 17.1 r/min 1169 Nm 1.37 2.6 kN 22 kN 9 kN 48.0 kg
CH-G D503 81.69 PAM100 81.69:1 IEC 100 · 28 mm shaft 3 kW 17.1 r/min 1595 Nm 1 2.6 kN 22 kN 9 kN 50.0 kg
CH-G D503 81.69 PAM112 81.69:1 IEC 112 · 28 mm shaft 4 kW 17.1 r/min 2126 Nm 0.75 2.6 kN 22 kN 9 kN 50.0 kg
CH-G D503 74.45 PAM80 74.45:1 IEC 80 · 19 mm shaft 1.1 kW 18.8 r/min 535 Nm 2.99 2.5 kN 22 kN 9 kN 48.0 kg
CH-G D503 74.45 PAM90 74.45:1 IEC 90 · 24 mm shaft 2.2 kW 18.8 r/min 1070 Nm 1.5 2.5 kN 22 kN 9 kN 48.0 kg
CH-G D503 74.45 PAM100 74.45:1 IEC 100 · 28 mm shaft 3 kW 18.8 r/min 1459 Nm 1.1 2.5 kN 22 kN 9 kN 50.0 kg
CH-G D503 74.45 PAM112 74.45:1 IEC 112 · 28 mm shaft 4 kW 18.8 r/min 1945 Nm 0.82 2.5 kN 22 kN 9 kN 50.0 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.

Need help specifying this product?

Our technical team can help you specify the right component. Add it to your quote basket above, or contact us directly.

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