{"id":127,"date":"2026-10-22T08:26:40","date_gmt":"2026-10-22T00:26:40","guid":{"rendered":"https:\/\/www.toginemotor.com\/?p=127"},"modified":"2026-10-22T08:26:40","modified_gmt":"2026-10-22T00:26:40","slug":"inline-gear-motors-c-face-selection-guide","status":"publish","type":"post","link":"https:\/\/www.toginemotor.com\/index.php\/2026\/10\/22\/inline-gear-motors-c-face-selection-guide\/","title":{"rendered":"Inline Gear Motors: C-Face Mounting & Selection Guide"},"content":{"rendered":"

An inline gear motor<\/strong> combines an electric motor and a reduction gearbox with the motor and output axes arranged in line. For a machine with room behind its driven shaft, this layout can provide a straightforward connection and a convenient assembly to install. The best choice, however, depends on more than motor power: output speed, torque, mounting dimensions and the operating cycle must all fit the application.<\/p>\n

This guide explains how to compare inline gear motors<\/strong>, what C-face means, and which details to confirm before ordering a new drive or replacing an existing one.<\/p>\n

Inline layout and C-face mounting describe different things<\/h2>\n

Inline describes the relationship between the motor axis and gearbox output axis. It does not identify every internal gear stage or specify how the motor attaches. Inline drives may use different reduction technologies; this article focuses on industrial helical units and their motor interfaces.<\/p>\n

C-face describes a motor mounting interface commonly associated with NEMA frames. A locating pilot and a defined bolt arrangement position the motor against a compatible mating component. The motor face has threaded mounting holes. The complete frame designation and dimensional drawing matter, because the words \u201cC-face\u201d alone do not establish compatibility.<\/p>\n

Buyers searching for inline C-face gear motors<\/strong> may mean a complete motor-and-reducer assembly or an inline reducer equipped to accept a separately supplied C-face motor. State which scope you need. Also distinguish the motor-side interface from the gearbox output mounting flange: they are separate connections.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Understanding the mounting terminology<\/strong><\/caption>\n
Description<\/th>\nWhat it tells you<\/th>\nWhat still needs confirmation<\/th>\n<\/tr>\n<\/thead>\n
Inline gear motor<\/td>\nMotor and output axes are in line<\/td>\nRatio, torque, envelope and mounting dimensions<\/td>\n<\/tr>\n
C-face motor input<\/td>\nA specified motor-face interface is used<\/td>\nFrame, pilot, bolt pattern, shaft and coupling fit<\/td>\n<\/tr>\n
Integral gearmotor<\/td>\nMotor and reducer form a matched assembly<\/td>\nMotor replacement procedure and available spare parts<\/td>\n<\/tr>\n
Foot-mounted gearbox<\/td>\nHousing support is through mounting feet<\/td>\nHole spacing, shaft height and foundation alignment<\/td>\n<\/tr>\n
Output flange mounting<\/td>\nGearbox mounts to the machine through a flange<\/td>\nPilot, bolt circle, shaft projection and supported loads<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

When is an inline gear motor a practical choice?<\/h2>\n

Consider the arrangement when a conveyor, feeder or other driven mechanism allows the motor to sit behind the gearbox output. Include the coupling, guard, terminal box and motor removal space in the layout. An assembly that fits during installation may still be difficult to service if a wall blocks motor withdrawal.<\/p>\n

If the available space requires the motor to turn away from the driven shaft, compare a helical bevel gearbox<\/a>. Where the motor and output need parallel but offset axes, review a parallel shaft reducer<\/a>. Choose the layout from the machine envelope rather than from a product name alone.<\/p>\n

How to specify inline C-face gear motors<\/h2>\n

Start with the exact motor identification and an approved drawing. Two motors with the same horsepower can differ in speed, shaft dimensions, frame or electrical characteristics. A flange that appears to fit does not prove that the shaft engages correctly or that the adapter can support the motor.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n
Motor-to-reducer interface checklist<\/strong><\/caption>\n
Item<\/th>\nInformation to provide<\/th>\nReason for checking<\/th>\n<\/tr>\n<\/thead>\n
Motor frame and standard<\/td>\nFull frame designation and manufacturer drawing<\/td>\nAvoids assuming NEMA and IEC interfaces are interchangeable<\/td>\n<\/tr>\n
Locating pilot<\/td>\nDiameter, depth and specified fit<\/td>\nEstablishes accurate seating at the interface<\/td>\n<\/tr>\n
Fasteners<\/td>\nBolt circle, thread size and permitted engagement<\/td>\nPrevents incorrect hardware or bottoming bolts<\/td>\n<\/tr>\n
Motor shaft<\/td>\nDiameter, projection and key dimensions<\/td>\nConfirms coupling or input-bore compatibility<\/td>\n<\/tr>\n
Adapter and coupling<\/td>\nApproved adapter model, coupling and assembly instructions<\/td>\nControls engagement and axial positioning<\/td>\n<\/tr>\n
Motor mass and position<\/td>\nWeight, orientation and support arrangement<\/td>\nAllows the supplier to review adapter loading<\/td>\n<\/tr>\n
Electrical duty<\/td>\nSupply, rated speed, controls and operating cycle<\/td>\nConfirms the motor suits the required mechanical duty<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

A modular adapter can make motor replacement convenient when a compatible replacement is available. It may also add length and another coupling to inspect. An integral assembly can simplify the package, but replacement may require specific components. Compare the actual maintenance procedure for each offer.<\/p>\n

Size the drive from output speed and torque<\/h2>\n

First establish the speed and torque required at the gearbox output. Account for any downstream chain, belt or gear ratio. For an initial estimate, reduction ratio = motor operating speed \u00f7 required gearbox output speed<\/strong>.<\/p>\n

For example, an illustrative motor speed of 1,450 rpm and a target output speed of 50 rpm give a ratio of 29:1. A catalog ratio near that value may produce a slightly different output speed. Use the proposed motor’s loaded speed and the actual available ratio when checking the final result.<\/p>\n

If the driven machine requires 100 N\u00b7m continuously at 50 rpm, its mechanical power demand at that shaft is approximately P = T \u00d7 n \u00f7 9,550 = 0.524 kW<\/strong>, with torque in N\u00b7m and speed in rpm. Motor power must cover transmission losses as well as the operating duty. This calculation is an example, not a product rating or a complete motor selection.<\/p>\n

Review starting torque, acceleration, shock loads and reversing separately. Confirm the gearbox’s continuous and peak limits using the supplier’s sizing method. A larger motor does not automatically make a gearbox suitable for a higher load.<\/p>\n

Check loads that a power calculation misses<\/h2>\n

A pulley or sprocket on the output shaft applies external forces as well as transmitting torque. Provide its diameter, tension information and distance from the shaft support. The allowable radial load depends on the selected unit and load position; axial loads need their own check.<\/p>\n

For variable-speed duty, describe the complete speed range and how long the drive operates at each point. Low-speed motor cooling, gearbox lubrication and available torque require review. Continuous operation also calls for a thermal check at the actual ambient temperature and ventilation conditions.<\/p>\n

Specify brakes by their required function, such as holding a stationary load or stopping moving equipment. Do not assume an inline helical reducer will hold a load when motor power is removed.<\/p>\n

Installation and replacement checks<\/h2>\n

Before assembly, compare the supplied equipment with the approved drawings and mounting position. Follow the manufacturer’s instructions for coupling placement, lubrication and tightening. Do not pull misaligned parts together with bolts or force a shaft connection into place.<\/p>\n

Confirm oil and breather provisions for the intended orientation, and leave access for inspection and removal. During commissioning, verify rotation through the machine’s approved procedure, then monitor operation under controlled load. Record a baseline for temperature, noise and vibration so later changes are easier to identify.<\/p>\n

Frequently asked questions<\/h2>\n

Are all inline gear motors C-face designs?<\/h3>\n

No. Inline describes the axis layout. The motor connection may be integral or use one of several adapter and flange arrangements.<\/p>\n

Can an IEC motor replace a NEMA C-face motor directly?<\/h3>\n

Do not assume a direct fit. Compare the complete interface and use a supplier-approved adapter or assembly where required. Similar power ratings do not establish dimensional compatibility.<\/p>\n

Can I order only the reducer?<\/h3>\n

Ask whether the quotation covers the reducer alone, a reducer with motor adapter and coupling, or a complete gearmotor. Provide the existing motor details if you intend to reuse it.<\/p>\n

Which matters more: horsepower or output torque?<\/h3>\n

Both must match the duty. Horsepower describes power, while output torque and speed describe what the driven shaft receives. Gearbox mechanical and thermal limits must also be satisfied.<\/p>\n

Prepare a clear inquiry for TOGINE<\/h2>\n

For an inline gear motor project, send TOGINE the required output speed, continuous and peak torque, operating hours, mounting drawing and electrical supply. For a C-face connection, include the full motor frame designation and shaft drawing. For replacement work, add nameplate photographs and the available installation space.<\/p>\n

Browse our transmission products<\/a>, review our helical geared motors guide<\/a>, or contact TOGINE to discuss your application<\/a>. Ask for confirmation of the proposed configuration and interface before ordering.<\/p>\n

Technical references: SEW-EURODRIVE gear-unit arrangements<\/a> and Baldor motor mounting and frame guidance<\/a>. These references explain general terminology; they do not establish TOGINE model specifications.<\/small><\/p>\n","protected":false},"excerpt":{"rendered":"

Compare inline gear motors and C-face mounting options. Check motor interfaces, output speed, torque and installation details before choosing a drive.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[13],"tags":[45,18,42,43,44],"_links":{"self":[{"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/posts\/127"}],"collection":[{"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/comments?post=127"}],"version-history":[{"count":1,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/posts\/127\/revisions"}],"predecessor-version":[{"id":128,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/posts\/127\/revisions\/128"}],"wp:attachment":[{"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/media?parent=127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/categories?post=127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.toginemotor.com\/index.php\/wp-json\/wp\/v2\/tags?post=127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}