Types of bolts and their uses the nuts and bolts blog. Specification for structural joints using highstrength bolts. It was the first type of screw drive to be developed, and for centuries it was the. A number of standard documents are available for the. We manufacture, stock and distribute a vast range of industrial fasteners and associated components. File folders and fastener folders from myorganized. This is followed by descriptions of the behavior of fasteners in the various types of connections that are encountered in. Instructional objectives at the end of this lesson, the students should have the knowledge of fasteners and their types. Modern industrial fasteners are manufactured to a variety of standards covering dimensions, tolerances, materials, mechanical properties, testing procedures, etc. Torque calculations for fasteners standard industry practice for calculating torque for a fastener assembly is to use the formula torque clamp load x diameter x friction factor 12 tpxdxk12 the desired clamp load is usually based on 75% of the yield strength or proof load strength of the threaded fastener. Fasteners can be used to close a container of a box or an envelope, or they may involve keeping together the.
The importance of the fastener lifetite metal products. The most commonly used types of structural bolts are 1 the astm a307 grade a carbon steel bolt, 2 the astm a325 highstrength steel bolt, and 3 the astm a490 quenched and tempered alloy steel. These types of fasteners provide maximum thread engagement in structural steel and timber constructions. Fastener length is usually measured from where the material is assumed to be to the end of the fastener. Both types of fasteners are sufficient for frequently accessed documents. How to select fasteners for plastic joints by lokesh kumar chief design engineer eisen electric corp. Manufacturer of all types of rivets rivets, pop rivets, lock type rivets and stainless steel multigrip type rivets offered by bharat industrial fasteners, chennai, tamil nadu.
Stainlesssteel nuts and bolts used in pipe couplings, restraints, joints, flanges and saddles for state revolving fund srf projects. Manufacturer of all types of rivets rivets, pop rivets, lock type rivets and stainless steel multigrip type rivets offered by bharat industrial fasteners. Fasteners invitation for expression of interest isro satellite centre isac of indian space research organisation isro under department of space, government of india is the lead centre of. Fasteners bolts, nuts and threaded rods torque, tension and loads related documents drill bits conversion chart convert between drill bit dimensions gauge numbers, inches and mm. Standard handbook of fastening pdf standard handbook of fastening and joining robert o.
Unf thread has a larger minor diameter than unc thread, which gives unf fasteners slightly higher loadcarrying in shear and better torquelocking capabilities than unc fasteners. A bolt is a threaded fastener which is always coupled with a nut. Engineering fundamentals of threaded fastener design and. The variety of fasteners, broadly divided into the following categories. Bolts have external male thread and nuts have internal male thread. All types of rivets rivets manufacturer from chennai. Once the ebook is opened, a menu will appear with several options to navigate and search through the e.
The terms bolts and screws do not refer to specific types of fasteners, but rather how they are used i. It is better to use types of selfthreading screws specially developed for polymeric materials or wood. Standard metric hex bolt sizes and thread pitches fastener. Certain types are some times referred to as stove bolts. The slot screw drive has a single slot in the fastener head and is driven by a common blade or flatbladed screwdriver. Although fasteners designed specifically for the automotive industry may occupy a large segment of the market, it is important to recognize that there are actually many different types of automotive fasteners. Nonremovable fasteners that expand behind the material, e. Mechanical drawing mdp 115 firstyear, mechanical engineering dept. To prevent damage to files in storage, place archivalquality paper between fasteners and the pages they touch. Identification charts for different types of fasteners. All types of boats on all kinds of waterways around the world benefit from beckson marine fasteners aboard contributing to. Before we get into the different types of screws, lets take a look at the different types of head styles. Socket screws are machine screws with an internal hex socket allen drive. Some typical thread geometries are shown in figure 9.
A fastener is a hardware device that is used for creating nonpermanent joints. Common fasteners include screws, bolts, nuts and rivets. Specification for structural joints using highstrength bolts august 1, 2014 includes april 2015 errata supersedes the december 31, 2009 specification for structural joints using highstrength bolts. The standard metric fastener thread series for general purpose threaded components is the m thread profile and the coarse pitch thread series. Heres an epic tool guide setting out all the different types of tools including hand tools, power tools, fasteners, gardening tools, measuring tools and a huge collection of tools for speicfic home. A bolt comprises of a head, cylindrical body and threads along its length. Fasteners may not be the star of the show, but theyre what hold the show together. For this type, the parts can be disconnected, but some damage usually occurs to the fastener, e. Capacity refers to how many pages a fastener can hold together. Threded fasteners useful joining technique that allows disassembly but need to guard against loosening most screw threads are righthanded widely used throughout industry.
Topics summary 1 fasteners 2 screw thread definitions 3 types of thread. Bolts are generally have the flat head which means there is no grove on the head. Fasteners are defined as hardware that can be easily installed and removed with hand or power tools. Fastener categories fastener type chart wood screws machine screws thread cutting machine screws sheet metal screws self drilling sms screws with a smooth shank and tapered point for use in wood. Thus, countersunk fasteners are measured overall and noncountersunk fasteners are measured from under the head.
A fastener us english or fastening uk english is a hardware device that mechanically joins or affixes two or more objects together. Most commonly used in the bulk production of bolts, screws, nuts for general engineering. Kaptoggle a non removable anchor commonly used for hollow spaces such as drywall and masonry block. A unc fastener can be procured with a class 3 tighter fit if needed fit classes covered below. The importance of the fastener by keith self, posted 02042015 concealed fasteners do an outstanding job holding metal panels in place whether driving through small towns, suburbs or major cities, metal. This type permits the parts to be readily disconnected without damaging the fastener, e. Bolts belong to the family of threaded fasteners and are paired with a threaded nut when in use, usually to join two or more components together. Another type is a threadcutting machine screw, which has a head that cuts its own. Dfm is the method of design for ease of manufacturing of the collection of parts that will form the product after assembly. Head styles, bolt and screw, drive, washer and nut types. Guide to design criteria for bolted and riveted joints. The fastener manual was intended primarily for aeronautical applica tions, where.
The torqueangle curves can also provide the necessary information to properly qualify the capability of tightening tools to properly tighten a given fastener. The ebook of comparative world steel standards on cdrom is a fully searchable adobe pdf file. Fasteners are widely used in various industries, including energy, electronics. Basic fastener types a bolt is a device with a head on one end of a. Plastic toggle when these anchors are driven in they expand inside the hole for a secure grip. An overview of the services and products tr fastenings supplies. To make it easy for you, weve compiled the data below as a guide for figuring out what each fastener is called. Handbook of comparative handbook world steel standards.