I thought i would post a few tidbits from the research. In this video, one of our resident fastener specialists talks about the types of materials fasteners screws, nuts, bolts, washers, etc are available in. For metric bolts strength is according iso 898 mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with designations 4. For metric bolts strength is according iso 898 mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with.
Apr 28, 2009 hex head bolts m5 and larger must have the property class marked on the head of the bolt, either in raised or depressed lettering. This grading, which is typically stamped on the head of the bolt, has the same tensile strength as a grade 8. The strength grade of a metric bolt, known as its property class, consists of two numbers separated by a dot. Manufacturing supplies ltd msl was the innovation of the company director in 1980 starting. Table of design properties for metric hexagonal bolts steel properties fy, fu for 4. Of course, matching grades of nut and boltstud must be used together. Table of design properties for metric steel bolts m5 to m39. The higher the iso numbers are, the stronger the bolt. Aries alloys is a known aluminium fasteners in india. Fastener reference tables conversions, hardness, thread pitch, tensile strength the tables below are provided as a general guide to help you better understand metric and imperial measurements. Metric bolt grades and strength calculator to show proof strength, tensile strength, vickers brinell hardness, minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 4.
Contact us metric bolt whole sale stainless steel metric. Caterpillar, bowman manufacture bolts to specifications that exceed those for sae grade 8 bolts. The tables below are provided as a general guide to help you better understand metric and imperial measurements. The chart below shows metric bolt conversions and din numbers for fasteners. Torque tightening values for structural steel bolts. A short guide to metric nuts and bolts answers to the most frequently asked questions standard and fine pitch th reads how to identify nut and bolt strength grades how nut and bolt strength grades compare maximum tightening torques why specifi ed torque is sometimes lower than the maximum spanner sizes versus bolt nut thread size.
When a bolt has a grading of s, it means that it can withstand a stress of 45 to 49. Fastener grades class kna fastener specifications fastenerdata. Metric threaded rod stainless steel grades metric metal. The use of nuts aids in disassembly and reassembly. They are available in coarse, fine, and extra fine thread. Bolts are headed, externally threaded fasteners used to keep two objects, often metal or wood, in a fixed position relative to one another. Different grades of fasteners can be identified by the markings on their heads table 1. How to determine bolt thread size bolt threads strength. Westfield fasteners carries stock of each size and type in our warehouse, ready for immediate despatch. The metric property classes grades of strength are defined by two numbers separated by a dot, where increasing numbers represents an increasing tensile strength.
Bolt grades i have been on a quite a few online email lists over the last 7 years or so, basically since they first came out. Metric imperial bolt ltd is an independent market leader in the manufacture of profile rolling, thread rolling, spline rolling and thread grinding. Metric bolts minimum ultimate tensile and proof loads. In addition to the indicated grade marking, all grades, except a563 grades o, a and b, must be marked for manufacturer identification. The markings shown for all grades of a194 nuts are for cold formed and hot forged nuts. Jan 07, 2017 different grades of fasteners can be identified by the markings on their heads table 1.
Stainless is often used as threaded studs, tie rods, u bolts and hooks. Radial lines, such those used to mark sae grades, are never used on metric bolts. Metric boltmaster distributor of metric fasteners dfar. Fastener tech data understanding series introduction. Larger sizes and those for specialized purposes, though, are made to meet certain strength requirements. Zinc plating creates corrosion resistance and gives the bolts a shiny finish. Usa grade 5 bolts have three evenly spaced radial lines on the head, and the material is similar in strength to european metric class 8. From the original jeepl list to the xjlist to the board, a common question comes. Determine the length of the metric bolt by looking at the third number. Allpro threaded neither employs nor maintains an engineering or technica l staff, and allpro is merely supplying certain. The property class is normally stamped on the head of the bolt. Always refer to project specifications and consult an engineer to ensure that your application is appropriate. Alloy steel, aluminum, brass, silicon bronze, and stainless steel are just some of the materials that fasteners are manufactured in. A short guide to metric nuts and bolts dd thomson rail.
Fastener conversion approximate equivalency common din numbers. If lubrication is to be applied to the nutbolt,multiply the recommended torque by the appropriate factor shown in the table on page 7. If a small load is applied the amount of stretch is also small, and the bolt is stretching elastically. Fortress is a quality new zealand brand conceived and distributed by msl. Grade 2 bolts a307 are a standard hardware grade steel. Zinc plated alloy steel is a common material that fasteners are manufactured in. When nuts are machined from bar stock the nut must be additionally marked with the letter b. Sae the main classifications are grades 2, 5, 8, allen heads, and stainless. Metricbolts roots date back to 1965, when a young technological entrepreneurship has emerged into a successful local business. Usa grade 8 bolts are alloy and are stronger than grade 5 bolts. The two figures indicate the tensile and yield strengths of the bolt or screw. This technical information is supplied as a courtesy.
Today i want to discuss the mechanical properties of metric fasteners as related under iso 898. Canada and united kingdom are the unified national. Stainless steel threaded rod is necessary when the material will be exposed to chemicals, salt water or extreme temperature because of its corrosion and temperature resistance. Metric bolt conversion metric bolt conversion data for industrial boltsrods, machine screws and small diameter fasteners from elgin fastener group includes metric to standard bolt conversions. Metric imperial bolt ltd was created through customer demand with request to gm2012 ltd formally grayson millwards ltd to make the finished article. Home reference section strength specifications of metric threaded fasteners.
Strength specifications of metric threaded fasteners. Nov 19, 20 i thought i would post a few tidbits from the research. Fasteners smaller than m5, and those with slotted or recessed heads, whatever their diameter, need not be marked. The property classes and their mechanical properties apply to bolts, screws and studs, with metric iso thread, with nominal thread diameter d. Below is a list of the recommended tightening torques for 12. As a master distributor of metric fasteners we take pride in providing metric nuts and bolts for clients with convenient access to the highest quality metric fasteners for aerospace, military, scientific as well as industrial grade fasteners, including dfar compliant metric nuts and bolts. Hex head bolts m5 and larger must have the property class marked on the head of the bolt, either in raised or depressed lettering. Metric bolt grade mechanical requirements for carbon steel. This is represented by the last number in a metric bolts designation. Astm, sae and iso grade markings for steel fasteners. Usa grade 5 bolts are the most common bolts found in automotive and other applications.
Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. Zinc plated alloy steel is most often available in grade a, grade c, grade 2, grade 5 and grade 8. Metric nuts proof loads proof loads of metric nuts coarse and fine threads. Metric bolt conversion data for industrial boltsrods, machine screws and small diameter fasteners from elgin fastener group includes metric to standard bolt conversions. Please use this form to contact metric bolt for more information regarding our services or sales inquiries. Nonstock items may vary due to variables in methods of manufacture. Threaded bolt stress area threaded bolts tensile stress area. Metric to imperial grade equivalents portland bolt. The number to the left of the dot indicates the ultimate tensile strength in mpa divided by 100.
Head marking grade and material nominal size range inches mechanical properties. Identification with the manufacturers mark and the property class is mandatory for hexagon screws 3. Metric steel bolts grades and property classes metric steel bolts, screws and studs proof and tensile strength. Conversions, hardness, thread pitch, tensile strength. As a master distributor of metric fasteners we take pride in providing metric nuts and bolts for clients with convenient access to the highest quality metric fasteners for aerospace, military, scientific as well as industrial. The combination of material, treatment, hardening, and coating aka plating are essential to determining the strength and appropriate application for each fastener. Both astm f568m and iso 8981 outline several grades of metric fastener, from low carbonlow strength, up to high strengthheat treated alloy. There are no fewer than 5 different threads for different applicaons and 10 different standard strength grades defined for each size of bolt.
Fasteners limited westfield road long crendon aylesbury hp18 9ew uk. Strength grades for metric fasteners are designated by a symbol comprised of 2 numbers, separated by a decimal. We pride ourselves on the quality of our products and. Stainless steel 316 a4 also known as a4 stainless, 316 is a highly corrosion resistant grade of stainless steel.
Externallythreaded fasteners metric series property class. Performance data listed are for standard production items only. How to determine the size, grade, and thread form of a nut or bolt. The metric system designates strength capabilities via property classes rather than grades. Since then the local business has developed considerably, positioning itself as one of the fastest growing companies in our industry. Of course, matching grades of nut and bolt stud must be used together. In preparing this guide to torque values, the following basic assumptions have been made. Identifying bolt grades and head markings for us grades 2, 5 and 8. Do not use these values if a different torque value or tightening procedure is given for specific application. Stainless steel 188 a2 also known as a2 stainless, 188 is the most common grade of stainless steel for general use. Material, nominal size range mm, mechanical properties. From the original jeepl list to the xjlist to the board, a. We also produce high integrity fasteners and precision components. Bolts and machine screws metric westfield fasteners ltd.
Mar 01, 2017 in this video, one of our resident fastener specialists talks about the types of materials fasteners screws, nuts, bolts, washers, etc are available in. Apr 24, 2017 many metric bolts denote the use of metric measurements with an m at the start of the bolt designation, such as m9x1. The property class is expressed in raised or depressed numerals on top or on the side of the bolt head, according to rules set by the international standards organization. Aries alloys is a leading distributor of aluminium aircraft fastening hardware for commercial and military aerospace applications. Besides using metric measurements, a metric bolt uses the distance between the threads rather than the thread pitch, used in.
The final tightening sequence is achieved smoothly and slowly. I explained that the subaru bolt is a metric m10x1. I went into depth explaining the different classes of metric bolts and grades of standard bolts. Understanding fastener grades and classes fastener mart. Aluminium bolts at updated price or cost to our clients from mumbai. We offer stainless steel threaded rod in a variety of grades and common metric sizes. Aluminium fasteners, aluminium 6082 nut bolts screws supplier. Unlike screws, which cut their own threads, bolts pair with the internal threads of nuts to stay in place and ensure the desired level of tension in the bolted joint. Tensile strength psi mpa us bolts no markings grade 2 low or medium carbon steel 14 thru 34.
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