What Is a Monkey Wrench Head?
A monkey wrench head is the independent head portion of a wrench, often referred to as an adjustable head. Since it consists only of the head, it requires attachment to various types of handles for use.
Uses of Monkey Wrench Heads
Monkey wrench heads are utilized for tightening and loosening bolts and nuts. They are particularly useful in situations where specific torque settings are required. When used in conjunction with a torque wrench handle, they allow for adjustable gripping to accommodate different bolt sizes, eliminating the need for multiple wrenches or socket changes. This versatility is beneficial for working with a mix of bolt sizes or unusual sizes, such as inch-sized bolts.
Ratchet-type monkey wrench heads are also available, enhancing work efficiency by allowing one-directional rotation.
Principle of Monkey Wrench Heads
Monkey wrench heads typically consist of three main parts:
- Upper Jaw (Fixed Jaw): The immovable part that securely grips the bolt.
- Lower Jaw (Adjusting Jaw): The adjustable part that moves in conjunction with a worm gear to change the opening width.
- Worm Gear (Adjusting Screw): The threaded gear that adjusts the lower jaw’s position, changing the opening width by turning towards or away from the handle.
How to Select Monkey Wrench Heads
- Size (Opening Dimensions): Choose a size that matches the width of the bolts or nuts you will be working with. Pay attention to both the upper and lower size limits of the wrench head.
- Compatibility: Ensure compatibility between the monkey wrench head and the handle, especially if they are from different manufacturers. Check the shape and size of the connecting parts.
- Allowable Torque: Select a monkey wrench head with an appropriate allowable torque for your application. The handle’s overall length may vary depending on the torque capacity.
Monkey wrench heads are also available in different configurations for specific applications, such as tight spaces, and with various handle types like ratchet or spinner for high-torque operations. It’s important to choose the type that best suits your needs.
How to Use Monkey Wrench Heads
First, adjust the monkey wrench head to fit the size of the bolt or nut. Securely grip the fastener with both jaws, ensuring no gap or wobble, to prevent damage to the bolt or potential injury. Be mindful of the direction of rotation, as turning in the wrong direction can overload the lower jaw and cause damage.