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Gearheads & Speed Reducers


SDP/SI provides a wide selection of ratios in both BuOrd (U.S. Bureau of Ordnance) and NEMA size gearheads and speed reducers to fit your application. We manufacture our gearheads and speed reducers to the highest exacting standards of craftsmanship.

Follow the links below for complete product specifications, price and availability, technical information and to download 3D CAD Models directly into your design:

» For Gearheads & Speed Reducers (Standard and Custiom)

The gearheads are attachable to BuOrd frame size servomotors without modifications to the input pinions and without complicated adapters. They are designed to be used in high-accuracy electromechanical systems. All gears are precision cut. The output gear and all stage pinions are made of hardened 416 Stainless Steel. Housings are black-anodized aluminum alloy and are precision bored for exacting center distances. The cantilever design combined with wide bearing span results in extremely low backlash.

Planetary gear and gearhead speed reducers that provide a high degree of position accuracy are also available. Our precision and economy planetary gearheads feature ratios from 3:1 to 700:1, standard NEMA sizes 17, 23, 34, and 42, inline, right angle and dual output styles. Spur gearheads, a low cost alternative to planetary gearheads are available in ratios from 3:1 to 100:1. If a standard unit design does not meet your expectations we can provide a custom design.

Standard Items

Gearheads: BuOrd, Planetary and Spur Gear type
Speed Reducers: BuOrd type and Right-Angle

Custom Design Gearheads and Speed Reducers

Many applications require a custom unit. Below is a list of some of the special applications gearheads and speed reducers that Sterling Instrument can produce from their inventory of existing designs.
Zero-Backlash Gearheads and Speed Reducers: For applications which require minimal lost motion throughout the gear train.
Splined Shaft Gearheads and Speed Reducers: For applications which require direct meshing with other component parts of the gear train.
Low-Backlash Gearheads and Speed Reducers: For applications which do not require zero backlash, but do require lower backlash than our standard units.
Tandem Gearheads and Speed Reducers: For applications which require reduction ratios higher than shown for our standard units.
Exact Ratio Gearheads and Speed Reducers:BuOrd Gearheads and Speed Reducers For applications requiring reduction ratios which are even integers.
Integral Slip Clutch Gearheads and Speed Reducers: For applications which require a built-in torque limiting device.
Heavy-Duty Gearheads and Speed Reducers: For applications which require two or three times the available output torque of standard gearheads and speed reducers.

SDP/SI also builds Speed Increasers in BuOrd configurations. If you would like to receive pricing information for your application, select the link to our Product Inquiry Form or give us a call for engineering assistance.