Tools for Threaded Fasteners 120

This class outlines the different types of tools for assembly commonly used with threaded fasteners.

Class Details

Class Name:
Tools for Threaded Fasteners 120
Number of Lessons:
Additional Language:

Class Outline

  • Objectives
  • Threaded Fastener Tool Selection
  • Hard Joints and Soft Joints
  • Types of Fastening Tools
  • Hand Tools
  • Types of Hand Wrenches
  • Types of Hand Screwdrivers
  • Battery-Powered Tools
  • Electric Tools
  • Pneumatic Tools
  • What Is a Clutch?
  • Continuous-Drive Clutch Tools
  • Types of Continuous-Drive Clutch Screwdrivers
  • Discontinuous-Drive Clutch Tools
  • Pulse Tools
  • Types of Assembly Lines
  • The Importance of Ergonomics
  • Summary


  • Describe the importance of fastener tool selection.
  • Distinguish between hard joints and soft joints.
  • List types of fastening tools.
  • Describe types of hand tools.
  • List types of hand wrenches.
  • List types of hand screwdrivers.
  • Describe characteristics of battery-powered tools.
  • Describe the characteristics of electric tools.
  • Describe the characteristics of pneumatic tools.
  • Define clutch.
  • Describe the characteristics of continuous-drive clutch tools.
  • List types of continuous-drive clutch screwdrivers.
  • Describe the characteristics of discontinuous-drive clutch tools.
  • Describe the characteristics of pulse tools.
  • List types of assembly lines.
  • Explain the importance of ergonomics.


  • Job Planning, Benchwork, & Layout I
  • Job Planning, Benchwork, and Layout-FastTrack
  • MSSC Manufacturing Processes and Production


Vocabulary Term Definition
air dryer A device that extracts moisture from the air. Shops that use compressors may have to use air dryers to keep shop air free from moisture.
assembly The process in which two or more objects are joined together.
assembly line A process in which products are mass-produced in stages.
automatic fastening tool A power tool, usually a screwdriver, that is automatically supplied with fasteners. The tool can be guided by an operator or a machine.
automatic-shutoff screwdriver A screwdriving tool that uses a continuous-drive clutch and results in little torque reaction. Automatic-shutoff screwdrivers are used for repetitive, but precise applications.
batch A specific quantity to be produced. Batch-model assembly lines produce products in groups.
batch-model assembly line A type of assembly line in which products are assembled in groups at a time.
battery-powered tool A tool powered by a battery. Battery-powered tools are the most portable of all the power tools.
bolt A cylindrically shaped, threaded device used for fastening parts. Bolts usually have blunt ends and mate with a nut.
box wrench A wrench with a closed, box-like end that covers the nut or bolt completely.
clutch A coupling found inside a motorized device that connects or disconnects parts to drive the mechanism.
combination wrench A wrench with one open-end and one box end.
conduit A pipe line or tubing that channels air or fluids. Pneumatic tools use conduits to channel the air that is delivered to the tools.
continuous-drive clutch A type of clutch that delivers power to the tool constantly.
direct-drive screwdriver A screwdriving tool that uses a continuous-drive clutch and stops once it achieves torque. Direct-drive clutch screwdrivers use air pressure to obtain torque and are mainly used on wood.
discontinuous-drive clutch A type of clutch that delivers power to the tool in bursts.
downtime Unproductive blocks of time during which operations cease to function, normally due to setup procedures or mechanical problems.
drill A tool that drives screws and creates holes. Drills do not contain a clutch and therefore do not control torque.
duty cycle The amount of work a tool can perform in a given amount of time before it must rest to prevent it from overheating.
electric tool A tool powered by electricity. Electrical tools operate quietly and cleanly.
ergonomics The study of designing devices to decrease operator discomfort or fatigue and increase productivity.
fastener A device that holds two or more objects together. A fastener can be a button or a zipper as well as a bolt or a screw.
flat-head screwdriver A screwdriver that has a flat blade and corresponds to slotted screws. Most properly referred to as a "slotted screwdriver."
hand tool A tool that is "powered" by an operator. The most common manual assembly tools are wrenches and screwdrivers.
hard joint A joint in which it takes the fastener less than a 30° turn to get the fastener from fitting snugly to reaching torque.
head The top part of a fastener into which a tool is inserted.
hydraulics The use of fluids to power a device. Pulse tools use hydraulics to achieve torque.
impact wrench An air-powered tool that uses a discontinuous-drive clutch to produce torque. Impact wrenches are often used to tighten lug nuts on cars when changing a tire.
jaw The part on an open-end wrench that grips the bolt. Jaws can be fixed or adjustable.
joint The meeting point of the two materials that are joined together. Most fasteners create a joint that can be disassembled and reassembled.
load The overall force applied to an object by external objects.
lug nut A large nut that mates with a heavy bolt.
mixed-model assembly line A type of assembly line in which assemblers work on all different models of a product in the same assembly line.
model A specific design of a product. Cars and appliances are examples of products that are available as many different models.
moving assembly line A type of assembly line in which large products, like cars or airplanes, move slowly along the line while the assemblers work on them.
nut A block, usually of metal, with a threaded hole that mates with a bolt. The outer shape of a nut is often six-sided.
open-end wrench A wrench that contains a set of jaws that tighten or loosen nuts and bolts. Open-end wrenches are ideal for use when the bolt or nut is not easily accessible.
Phillips screwdriver A screwdriver with four intersecting perpendicular points that corresponds to Phillips screws.
pistol grip A type of handle grip that is curved and designed to fit with the anatomy of the hand.
pneumatic tool A tool that is powered by compressed air. Pneumatic tools are good for repetitive tasks and for applications with a high torque value.
power source A device used to generate the energy needed to power a tool. The most common power sources for screwdriving tools are electricity, air, and batteries.
power tool A tool that is powered by an external source such as electricity or compressed air.
power-to-weight ratio The power the tool generates divided by the weight of the tool. High power-to-weight ratios are preferable.
pozidriv screwdriver A screwdriver with four intersecting adjacent points that corresponds to pozidriv screws.
pulse tool A screwdriving tool that uses a discontinuous-drive clutch and hydraulics to generate torque. Pulse tools are common for applications that use large bolts.
ratchet A wrenching device attached to a socket that turns a fastener in one direction only.
screw A threaded device used for fastening parts or transferring motion. Screws usually have pointed ends.
screwdriver A type of manual assembly tool that tightens and loosens screws. Screwdrivers contain a grip on one end and a blade on the other end that corresponds to the head on the screw.
single-model assembly line A type of assembly line in which assemblers work on the same design of the same product.
slip-clutch screwdriver A screwdriving tool that uses a continuous-drive clutch and "slips" once it achieves torque, instead of stopping. Slip-clutch screwdrivers are versatile and are convenient when applications differ from task to task.
socket A device that covers a nut or bolt completely for tightening or loosening. Sockets attach to various devices that are used to tighten the bolt or nut.
socket wrench set A set of wrenches that includes a set of sockets and different types of wrenching tools that can be attached to the sockets for tightening.
soft joint A joint in which it takes the fastener more than a 720° turn, or two full rotations, to get from fitting snugly to reaching torque.
straight handle A type of handle grip that is straight up and down.
T-handle A wrenching device in the shape of a "T" that attaches to a socket and tightens a nut or bolt. T-handles contain a mechanism that prevents over-torquing.
thread forming screw A type of screw that forms the material around a hole until it wraps around the screw threads. Thread-forming screws do not remove any material from the engaged section.
threaded fastener A type of fastener that contains threads. Bolts, screws, and nuts are examples of threaded fasteners.
tool A device such as a screwdriver or wrench used to perform mechanical work.
torque The amount of force applied to tighten a bolt, screw, or nut.
torque reaction A jerk that assemblers feel in the handle of the tool they are using when torque is reached. Torque reaction is undesirable and is an ergonomic concern because it can cause injury.
torque regulator A device found on automated screwdriving tools that indicates when desired torque has been obtained.
torque tolerance An unwanted, but acceptable deviation from the desired torque.
torque value The decided amount of force required to properly tighten a fastener.
torx screwdriver A screwdriver with six points that corresponds to torx screws.
trigger A button or lever that, when depressed, delivers power to an automated device.
wrench A type of manual assembly tool that tightens and turns bolts and nuts. Wrenches contain fixed or moving jaws or a round attachment that grips the nuts or bolts.