More exposed threads within the grip (the area between the head and nut) will result in a "springier" bolt. Conversely, there should be two full threads exposed on the head side of the nut to make sure the nut can be properly tightened. The bolt should be long enough to allow at least two full threads to extend beyond the nut face after tightening, which ensures full thread engagement with the nut. The size and length of inch series fasteners is specified in inches, usually fractional rather than decimal. Lengths can be as short as 3/8", again for stove bolts, but are usually between about 1/2" and 24". While stove bolts can be as small as 1/8" in diameter, expect typical bolt sizes to be between about #10 (3/16") and 1 3/4". Size refers to nominal diameter of the bolt while length is just that-how long the bolt is. "The point of a fastener is the configuration of the end of the shank of a headed fastener or of each end of a headless fastener." Point style varies by bolt type and some types are not pointed, such as carriage bolts. Unless noted otherwise, right-hand threads are standard, so turn the bolt (or nut) clockwise to tighten. Some types, though, are always fully threaded and others are always partially threaded. Short lengths are often fully threaded, longer lengths are partially threaded. Also, smaller sizes have more threads per inch than larger sizes-see Table 2 for a comparison between UNC and UNF threads per inch by bolt size. Consequently, the larger the number of threads per inch, the finer the thread. Coarse threaded fasteners have fewer threads per inch than fine threaded fasteners because coarse threads are farther apart. Unified inch coarse series (UNC, Unified National Coarse) threads are largely standard Unified inch fine (UNF, Unified National Fine) may be available too. So, officially, some bolts are really screws, like lag, shoulder and stove bolts. Also, stove bolts are often tightened and released by turning their head. Common bolts are listed in Table 1, or click on a type above for detailed information.īy definition, "A Bolt is a headed and externally threaded mechanical device designed for insertion through holes in assembled parts to mate with a nut and is normally intended to be tightened or released by turning that nut." There are exceptions, like anchor bolts, which are cast in concrete. Others, like carriage and elevator bolts, do not have diminutive equivalents. Some have similar, smaller screw counterparts-lag bolts are heavy-duty wood screws, for example. Depending on the type, uses include fastening wood to wood, wood to metal, metal to metal, and objects to wood and metal. Click on a BOLT type above to continue shopping… BOLTSīolts are generally considered to be larger than screws and are used in a wide variety of applications especially where load-carrying capacity is a requirement.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |