1.1.3 Mechanical Joint: Keyway

Keyways transmit torque between a shaft and gear by means of a rectangular key secured to the shaft by dowels, pins or set screws. Machining costs for tolerances required by keyways may be significant. The diameter of a shaft in which a key is seated must be increased by up to 30% to accommodate the key while supporting the torque load.

Figure 7 Shaped joints with intermediate elements as a key
Figure 8 Fastening methods for cylindrical joints between shaft and element on shaft (gear, pulley) mounted using a keyway and set-screw
Figure 9 Shaft diameter must be increased to accommodate a key

1.1.4 Mechanical Joint: Folding or Clinching

Two pieces of sheet metal can be connected to each other by folding or bending tabs in the form of a buckle and a clamping slot in a folded joint. This assembly method is relatively quick, reliable, economical and convenient.

However, folded metal joints do not seal and may be susceptible to corrosion. These types of joints require a relatively long contact area to provide strength and are not suitable for plastics.

Figure 10 Examples of mechanically folded joints

Table of contents

Already have an account? Sign in

+33,000
professionals

have already
signed up

Award winning manual

Platinum Award for LOCTITE®X Digital Manual

The Digital Manual is for professionals by professionals

The manual is made entirely for you. However, if you’re still not convinced that free industry knowledge is for you, take a look at these user testimonials from the users of the manual.

"The topics are such that I can help take design related decisions very well at work. It's an interesting and knowledgeable read, I recommended my other colleagues to have a look at the manual as well."

Hanumant, Production Incharge

"The manual's chapters significantly enhanced my comprehension of various engineering topics. The manual adeptly presents explanations and examples of concepts, showcasing a high level of clarity and effectiveness in its content."

Tejas, Mechanical Engineer from a renowned Engineering College

"The release of this manual by a renowned brand such as Loctite has proven to be highly motivating for students. Its authentic content serves as a source of inspiration, encouraging students to engage actively in reading and learning."

Padmakar Deshmukh, Professor at an Engineering College