SITI BH160 Bevel-Helical Gearbox (build-to-order)

The SITI BH160 is a bevel-helical gear unit from SITI Riduttori’s BH series, with output torque up to 8000 Nm and reduction ratios from 7.56:1 to 186:1. Built to order and supplied Australia-wide by Mechtric.

Select the reduction ratio, motor input and output arrangement above and the full part number is built for you. Every combination is a real SITI build — unavailable combinations are blocked automatically.

Specifications

• Output torque: up to 8000 Nm
• Reduction ratio: i = 7.56 : 1 to 186 : 1
• Input power: 4.41 – 110 kW
• Output shaft: Ø90 mm
• Output executions: C, CC, MS, MD
• Approx. weight: 260 kg
• Mounting: B3 (foot, standard), B6, B7, B8, V5, V6, B5 output flange (optional), torque arm (optional, for shaft-mounted reaction)
• IEC motor adaption: 100, 112, 132, 160, 180, 200, 225

Key Features

• 3-stage bevel-helical gear train (helical + spiral-bevel Gleason Duplex + helical)
• 9 frame sizes; BH63-BH200 span 450-14,000 Nm max output torque
• Case-hardened 20MnCr5 gearing, verified to DIN 3990 / AGMA 2001 B88 / ISO 6336
• Cast iron EN-GJL-250 housing (sizes 63-200)
• 0.92 dynamic efficiency
• Standard hollow output shaft (C); optional CC (hollow + taper lock), MS (single solid), MD (double solid)
• Optional B5 output flange — square on sizes 63/80/100, round on 125-200
• Optional torque arm for shaft-mounted reaction — sizes 63-160 only, not 180/200

About the Bevel-Helical series

• Bevel-helical (orthogonal-axis) gearboxes with three reduction stages: an input cylindrical helical gear pair, a mid-stage spiral-bevel Gleason gear pair (Duplex-type toothing), and a final cylindrical helical/involute gear pair (p.5-6).
• Made in 9 frame sizes (56 through 200); across the whole range rated transmissible output torque spans 180 Nm to 14,000 Nm (p.5) — Mechtric's BH63-BH200 subset spans 450-14,000 Nm.
• Gear tooth load capacity verified to DIN 3990, UNI 8862, AGMA 2001 B88 and the ISO 6336 draft, calculating both surface pitting resistance and root bending strength (p.5).
• Gearing is case-hardening steel 20MnCr5 (or equivalent), case-hardened, quenched and stress-relieved for high static/dynamic and wear resistance (p.5-6).
• Output shaft bearings: radial ball bearings standard on sizes 56-125 (taper roller bearings available on request); taper roller bearings are standard-fit on sizes 140-200 (p.5).
• Housing material: aluminium EN AC-46100 only on the smallest size (56); cast iron EN-GJL-250 for every other size — so all of Mechtric's BH63-BH200 frames are cast iron (p.6).
• Dynamic efficiency rated at 0.92 (p.6-7).
• Sold in three input configurations: BH (solid input shaft), MBH (PAM adapter for direct IEC B5 motor mounting — not offered on sizes 180/200), MBHGC (input via flexible coupling + bell-housing — not offered on size 56) (p.7).