1 AUTOMOTIVE FASTENERS 2 Fasteners for every application.

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Transcript of 1 AUTOMOTIVE FASTENERS 2 Fasteners for every application.

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Slide 2 1 AUTOMOTIVE FASTENERS Slide 3 2 Fasteners for every application Slide 4 3 Types of Mechanical Fasteners Bolts or cap screws Nuts Washers Studs Cotter pins Roll pins Snap rings Slide 5 4 And still more... Slide 6 5 Bolts The most common threaded fastener Many variations Uses either a metric or standard thread pitch measured in threads per inch or millimeters The bolt size is its diameter. Hex size is the wrench size. Length is measured from hex to threaded end. Bolt grade markings are on the top of the hex. Slide 7 6 Bolt Grades ( hardness) Slide 8 7 Naming Bolts Slide 9 8 Clamping Force Slide 10 9 Bolt Size The size of the bolt is the diameter of the shank of the bolt. Metrics in millimeters. Standards in fractions of an inch. Slide 11 10 Bolt Length The bolt length is the distance from the hex head to the end of the thread. Slide 12 11 Thread Pitch Two general types of bolts used. Standard fractional inch sizes. Metric millimeter sizes. Look at the top of the hex head to tell the difference. Slide 13 12 Thread Classification UNC-United National Course UNF-United-National Fine NPT-National Pipe Thread Metric Slide 14 13 Bolt Designations First item is bolt size which is the same as the bolt diameter. Second item is the thread pitch. Third is bolt length. Slide 15 14 Measuring Thread Pitch The pitch gauge has teeth much like the threads. Put the gauge that fits into the threads and read the number on the gauge. Standards in threads per inch. Metrics in threads per millimeters. Slide 16 15 Hex Head Sizes This is the size wrench that will be needed to install or remove a bolt. Pay attention to metric or standard. Torque to proper amount. Metric Standard Slide 17 16 Studs Studs look similar to a bolt but have no hex head for a wrench. One end screws into an engine part and the other holds a different part on with a nut. Slide 18 17 Nuts Slide 19 18 Washers Washers help the bolt head with support. Washer can be lock washers to keep the bolt from working loose. Slide 20 19... and more washers Slide 21 20 Cotter Pins Cotter pins are used to secure nuts to shafts so they dont come loose. Often used with a castle nut. Slide 22 21 Snap Rings Snap rings are used to secure bearings, gears, and linkages. Slide 23 22 Torque Wrenches Torque wrench measure how much you are tightening a bolt. Bolts can only take so much torque or they break off! Thats a bad thing. Slide 24 23 How Much Torque? The amount to torque a bolt depends on two important items. 1 The diameter of the bolt. (the fatter the stronger) 2 The grade of the bolt. (the better the grade the more torque it can take) Slide 25 24 Bolt Torque Charts These are found in repair manuals, service manuals and on computer data systems. Torque Sequence Slide 26 25 Thread Lock Compounds such as Locktite literally glue the threads so they dont vibrate loose. Slide 27 26 Anti-Seize Compounds Inhibits the threads from rusting up and totally jamming together. Slide 28 27 Screws Slide 29 28 Keys Slide 30 29 Shafts with splines Slide 31 30 Thread Repair Tools Slide 32 31 Taps & Dies Slide 33 32 Thread Inserts (helicoils)