Bonfiglioli W 86 20:1 Worm Gearbox – 35mm Bore, IEC Motor Input

This Bonfiglioli W 86 20:1 worm gearbox is a right-angle speed reducer built around the heavy-duty worm gearbox platform. It is suited to larger industrial drives and higher-load right-angle power transmission where balanced speed reduction and practical torque increase are required. This version uses a 35mm hollow output bore and modular IEC motor input options for straightforward industrial integration.

---

Gearbox Overview

The Bonfiglioli W 86 size is part of the VF-W worm gearbox range and is designed for flexible installation in multiple mounting positions. In this 20:1 configuration, it offers A balanced reduction ratio for general machinery, conveyors, and OEM equipment. The hollow bore output format makes it practical for direct shaft-mount transmission layouts where compact right-angle drive arrangements are preferred.

---

Why Choose This Configuration?

This exact model is best suited to buyers who need a Bonfiglioli W 86 gearbox with a 20:1 ratio and 35mm output bore. Compared with lower ratios, this version is a strong all-round choice where speed needs to be reduced without moving into very slow outputs. Compared with higher frame sizes, it keeps the package more compact while retaining the modular mounting and input flexibility shown in the datasheet.

---

Technical Details

Series: Bonfiglioli VF-W worm gearbox range
Gearbox size: W 86
Reduction ratio: 20:1
Output bore: 35mm hollow bore
Mounting positions: B3, B6, B7, B8, V5, V6
Motor mounting options: B5, B14, or HS solid input depending on size/configuration
Typical input configurations: 71B5, 71B14, 80B5, 80B14, 90B5, 90B14, 100B5-112B5, 100-112B14
Lubrication: Factory-charged with long-life synthetic lubricant. Datasheet lubricant reference: Shell Omala S4 WE 320.
Approximate gearbox weight: 14.1kg

---

Internal Links & Compatible Options

Same gearbox size, different ratios: explore nearby ratios for the Bonfiglioli W 86 gearbox.

Same ratio, different gearbox sizes: explore nearby sizes offering a 20:1 ratio.

More Bonfiglioli gearboxes: Browse all worm gearboxes Browse all gearboxes

Helpful calculators:
Gearbox Ratio & Speed Calculator |
Output Torque Calculator

---

Frequently Asked Questions

What does a 20:1 worm gearbox do?

A 20:1 worm gearbox reduces input speed by a factor of 20, increasing torque at the output while providing a compact right-angle drive arrangement.

What motor inputs fit this Bonfiglioli W 86 gearbox?

This size is available with modular IEC motor input options and, depending on the configuration, can also be supplied with a solid input shaft according to the VF-W series ordering structure.

What mounting positions are available?

The VF-W datasheet lists mounting positions B3, B6, B7, B8, V5, V6, allowing the gearbox to be installed to suit different machine layouts.

What lubricant does this gearbox use?

The datasheet specifies a long-life synthetic lubricant, with Shell Omala S4 WE 320 listed in the lubrication section for the VF-W range.

Is this a hollow bore gearbox?

Yes. This product uses a 35mm hollow bore output, making it suitable for shaft-mounted output arrangements.