Fastener Tech Data Understanding Series Introduction. Is it a bolt or is it a screw ? A simple question you might think, but one that generates substantial debate. There's actually a very small distinction between the two, so much so that sometimes a screw is called a bolt and vice versa. Understanding Deck Screws, Bolts, and Fasteners . Screws and bolts hold the world together - literally! Because the little guys have such important jobs, heree in wide varieties of shapes and sizes. Your backyard deck is constructed with a handful of specialty fasteners . The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated mm). For nuts , size will appear as diameter and pitch. There is an exception though—if pitch isn't specified, the fastener is coarse threaded.

Understanding Fastener Notation. Print this page . Basic Identification. Below is an example of a full fastener description. This notation includes all of the information needed to identify the fastener. Only machine threaded fasteners ( nuts , and screws/ bolts that could take a nut) specify a thread count or thread pitch. Some of the different head shapes in which screws are available include pan, button, round, muschroom, oval, bulge, cheese, fillister and flanged. And like their bolt counterparts, screws are available in a range of materials. After reading this, you should have a better understanding of the difference between screws and bolts . Understanding Wood; Plans and Projects. COL1. Woodworking Furniture Plans; . Understanding Different Types of Screws. ENJOY THIS FREE VIDEO! . This video concentrates on fasteners , but Woodworkers Guild of America has a ton of other information for you.

The documents also cover more exotic fastener types like J- bolts , sex bolts , shoulder bolts , and more. The 28-page guide covers the anatomy of bolts and screws, different head types, drive types, thread count and pitch, and how to measure diameter and length. Guide to Fastener Sizes. Understanding Standard Size Dimensions. The Size Dimension pertains to diameter of screws, bolts , pins and inner diameter of nuts and washers. You may search for your product based on diameter by selecting a measurement on the Size dropdown. Standard Bolts and Nuts Standard bolts and nuts have characteristics determined by: Bolt types Finish Proportions Threads Thread lengths Bolt lengths Specifications In specifying bolts , the following information must be covered in order: Nominal size of bolt body Thread specification or thread note Length of bolt Finish of bolt Style of head