Fasteners

Use of fasteners in a block.

QR Code link to the website.

Fasteners are used to fix different objects together.

For other types of fasteners not listed, go to http://www.mcmaster.com

Pictures and descriptions derived from McMaster-Carr.

Useful links:

• Drilling and Tapping
• Diameter Pitch

Procedure

Principle
1. The purpose of a Standard Operating Procedure (SOP) for SOPs is to provide Instructions for the user to best accomplish an individual task.
2. The purpose of the associated SOP Manual is to ensure accurate Selection of local fasteners in the University of Idaho ME Machine shop

Steps to fastener selection
1. Define need of fastener, including FBD, and calculations (Bolt calculation information can be found in “Mechanical Engineering Design” by Shigley and Mischke.
   This is the text used in ME 325.
2. Identify correct type of fastener to fit previously defined needs.
List of stocked fastener types, sizes, and their uses available below
(Check the shop first before planning on using any of these fasteners, there's a possibility stock may be running low on certain bolts or stock has changed)

Fastener sizes available in the machine shop

Lengths of stocked fasteners

1. Find closest available size to meet calculated requirements
1. Inventory List available at http://mindworks.shoutwiki.com/wiki/File:2015L_fasteners_Poster.png
2. Check with project advisor and shop manager before ordering fasteners that are not stocked.
2. Draw or Locate 3-D model of fastener
1. Suggest using McMaster-Carr website to locate 3-D model of Fastener https://www.mcmaster.com/
3. Ensure part file is named to match UIdaho inventory NOT McMaster-Carr inventory.
5. Ensure BOM includes UIdaho inventory name NOT McMaster-Carr Inventory name
3. Acquire fasteners chosen from inventory within Machine shop.
4. If you have any questions with regards to Fastener selection your Project advisor, and shop manager are great resources.
Appendices
1. http://mindworks.shoutwiki.com/wiki/Fasteners
3. http://mindworks.shoutwiki.com/wiki/File:2015L_fasteners_Poster.png
5. https://www.mcmaster.com/

Screws and Bolts

*Not available in the machine shop

Flat-Head Socket Cap Screw		Designed for high-tensile strength applications and flush mounting operations. Common in Tools and Dies. Requires a countersink to be flush with the surface. See Drilling and Tapping for more information.
Button-Head Socket Cap Screw		Wide bearing surface. Offers a finished appearance. Designed for light fastening operations.
Socket-Head Cap Screw		High-strength tension applications. Designed for clamping assemblies. Reliable and Durable. Requires a counterbore to be flush with the surface. See How to Use Counterbores for more information.
Hex-Head Cap Screw		General Purpose Fastening.
Set Screw		Designed to hold objects in place, such as a pulley on an axle. Often used in conjunction with a key.
Thumb Screw		Adjustable by hand. Use in applications where hand tightening is adequate.
Machine Screw*		Available in different head styles. Use in lower strength applications.
Carriage Bolt*		Neck keeps bolt from turning when tightening a nut. Use in applications where the bolt cannot be easily accessed after assembly.
Threaded Rod*		Alternative to a bolt. Used to anchor elements to surfaces, mount wheels and pulleys, etc.

Nuts

Hex Nuts		General Purpose Fastening.
Lock Nuts*		Nylon insert grips teeth to prevent loosening. Can only be reused a few times. Available in various types.
Slotted Lock Nuts (Castle Nuts)*		Light duty locking applications. Secured using a cotter pin through a hole in a bolt.
Flange Nuts*		Flange distributes load over a larger surface area.
Tee Nuts*		Use to fasten wood or soft materials using steel bolts.

Washers

Flat Washer		General Purpose Fastening. Spreads load over a larger surface area.
Lock Washer, Spring (Split Lock)		Prevents bolts from loosening under vibrations.
Lock Washer, Star (Tooth Lock)		Prevents bolts from loosening under vibrations. Use when bolt head can come into contact with the teeth.

Pins

Dowel Pin		Use for alignment of machine components. Alternate use as a guide for machine parts.
Spring Pin, Slotted		Slot is pressed close when inserted. No flex after installation.
Spring Pin, Coiled (Roll Pin)		Absorb shock and vibration after installation. Higher load capacity than slotted spring pins.
Cotter Pin		Used to hold assemblies, such as bolts and nuts, together. Use with a slotted lock nut.
Taper Pin		Use to position components and secure assemblies.

Other

Rivets

Permanently hold two pieces of material together. Punch through a pre-drilled hole.