Identifying bolt grades and head markings for us grades 2, 5 and 8. 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. In addition to the indicated grade marking, all grades, except a563 grades o, a and b, must be marked for manufacturer identification. Canada and united kingdom are the unified national. The combination of material, treatment, hardening, and coating aka plating are essential to determining the strength and appropriate application for each fastener. The chart below shows metric bolt conversions and din numbers for fasteners. 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. Stainless steel 188 a2 also known as a2 stainless, 188 is the most common grade of stainless steel for general use. I went into depth explaining the different classes of metric bolts and grades of standard bolts. Allpro threaded neither employs nor maintains an engineering or technica l staff, and allpro is merely supplying certain. When a bolt has a grading of s, it means that it can withstand a stress of 45 to 49. Today i want to discuss the mechanical properties of metric fasteners as related under iso 898. For metric bolts strength is according iso 898 mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with. We offer stainless steel threaded rod in a variety of grades and common metric sizes.
The two figures indicate the tensile and yield strengths of the bolt or screw. 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 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. Nov 19, 20 i thought i would post a few tidbits from the research. Nonstock items may vary due to variables in methods of manufacture. Metric bolt conversion data for industrial boltsrods, machine screws and small diameter fasteners from elgin fastener group includes metric to standard bolt conversions. Do not use these values if a different torque value or tightening procedure is given for specific application. In preparing this guide to torque values, the following basic assumptions have been made. Strength grades for metric fasteners are designated by a symbol comprised of 2 numbers, separated by a decimal. 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. Stainless is often used as threaded studs, tie rods, u bolts and hooks. Always refer to project specifications and consult an engineer to ensure that your application is appropriate. Conversions, hardness, thread pitch, tensile strength. Aluminium fasteners aluminium 6082 nuts, 5083 aluminium coupling screw exporter, aluminium bolts, aluminium 6061, 6082, 5083, 5086, 5052,6063, 7075, 1100 screws, aluminium werkstoff nr.
There are no fewer than 5 different threads for different applicaons and 10 different standard strength grades defined for each size of bolt. They are available in coarse, fine, and extra fine thread. Manufacturing supplies ltd msl was the innovation of the company director in 1980 starting. Fasteners limited westfield road long crendon aylesbury hp18 9ew uk.
The property class is normally stamped on the head of the bolt. Torque tightening values for structural steel bolts. The use of nuts aids in disassembly and reassembly. We pride ourselves on the quality of our products and. Zinc plated alloy steel is a common material that fasteners are manufactured in. How to determine the size, grade, and thread form of a nut or bolt. Material, nominal size range mm, mechanical properties. Aluminium fasteners, aluminium 6082 nut bolts screws supplier. From the original jeepl list to the xjlist to the board, a. Table of design properties for metric steel bolts m5 to m39. The tables below are provided as a general guide to help you better understand metric and imperial measurements. Metric imperial bolt ltd was created through customer demand with request to gm2012 ltd formally grayson millwards ltd to make the finished article. Fastener conversion approximate equivalency common din numbers. Of course, matching grades of nut and bolt stud must be used together.
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. This is represented by the last number in a metric bolts designation. Fasteners smaller than m5, and those with slotted or recessed heads, whatever their diameter, need not be marked. Usa grade 5 bolts are the most common bolts found in automotive and other applications. The metric system designates strength capabilities via property classes rather than grades. Besides using metric measurements, a metric bolt uses the distance between the threads rather than the thread pitch, used in. The property classes and their mechanical properties apply to bolts, screws and studs, with metric iso thread, with nominal thread diameter d. The metric property classes grades of strength are defined by two numbers separated by a dot, where increasing numbers represents an increasing tensile strength.
This grading, which is typically stamped on the head of the bolt, has the same tensile strength as a grade 8. Metric bolt grade mechanical requirements for carbon steel. Fastener grades class kna fastener specifications fastenerdata. The final tightening sequence is achieved smoothly and slowly. Aries alloys is a leading distributor of aluminium aircraft fastening hardware for commercial and military aerospace applications. I thought i would post a few tidbits from the research. Fastener tech data understanding series introduction. When nuts are machined from bar stock the nut must be additionally marked with the letter b. Aluminium bolts at updated price or cost to our clients from mumbai. Bolts and machine screws metric presented on this page is our current range of metric threaded bolts and machine screws, to be used in conjunction with the equivalent metric sized nuts and washers. Aries alloys is a known aluminium fasteners in india. Home reference section strength specifications of metric threaded fasteners. Table of design properties for metric hexagonal bolts steel properties fy, fu for 4. The strength grade of a metric bolt, known as its property class, consists of two numbers separated by a dot.
Below is a list of the recommended tightening torques for 12. 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. Metric imperial bolt ltd is an independent market leader in the manufacture of profile rolling, thread rolling, spline rolling and thread grinding. 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. Stainless steel 316 a4 also known as a4 stainless, 316 is a highly corrosion resistant grade of stainless steel. Metric threaded rod stainless steel grades metric metal. Fortress is a quality new zealand brand conceived and distributed by msl. Different grades of fasteners can be identified by the markings on their heads table 1. 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. Bolts and machine screws metric westfield fasteners ltd. Westfield fasteners carries stock of each size and type in our warehouse, ready for immediate despatch.
Externallythreaded fasteners metric series property class. Understanding fastener grades and classes fastener mart. Radial lines, such those used to mark sae grades, are never used on metric bolts. Of course, matching grades of nut and boltstud must be used together. Metric to imperial grade equivalents portland bolt. Metric bolts minimum ultimate tensile and proof loads. Contact us metric bolt whole sale stainless steel metric. Hex head bolts m5 and larger must have the property class marked on the head of the bolt, either in raised or depressed lettering. Performance data listed are for standard production items only.
Metric fastener threads are also specified according to thread pitch, which is the distance between adjacent threads, again in millimeters. Metricbolts roots date back to 1965, when a young technological entrepreneurship has emerged into a successful local business. If lubrication is to be applied to the nutbolt,multiply the recommended torque by the appropriate factor shown in the table on page 7. Jan 07, 2017 different grades of fasteners can be identified by the markings on their heads table 1. 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. The markings shown for all grades of a194 nuts are for cold formed and hot forged nuts. Strength specifications of metric threaded fasteners. 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. 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 2 thomson rail. How to determine bolt thread size bolt threads strength. Tensile strength psi mpa us bolts no markings grade 2 low or medium carbon steel 14 thru 34. Grade 2 bolts a307 are a standard hardware grade steel. If a small load is applied the amount of stretch is also small, and the bolt is stretching elastically.
Head marking grade and material nominal size range inches mechanical properties. Determine the length of the metric bolt by looking at the third number. Metric steel bolts grades and property classes metric steel bolts, screws and studs proof and tensile strength. Zinc plating creates corrosion resistance and gives the bolts a shiny finish. Metric boltmaster distributor of metric fasteners dfar. In this video, one of our resident fastener specialists talks about the types of materials fasteners screws, nuts, bolts, washers, etc are available in. The number to the left of the dot indicates the ultimate tensile strength in mpa divided by 100. Threaded bolt stress area threaded bolts tensile stress area. I explained that the subaru bolt is a metric m10x1.
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. Bolts are headed, externally threaded fasteners used to keep two objects, often metal or wood, in a fixed position relative to one another. Zinc plated alloy steel is most often available in grade a, grade c, grade 2, grade 5 and grade 8. 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. Larger sizes and those for specialized purposes, though, are made to meet certain strength requirements. This technical information is supplied as a courtesy. Caterpillar, bowman manufacture bolts to specifications that exceed those for sae grade 8 bolts. Usa grade 8 bolts are alloy and are stronger than grade 5 bolts. Gm2012 ltd has expertly supplied tooling to the fastener and pharmaceutical industry for 49 years. Bolt grade markings and strength chart mechanical properties head marking grade and material nominal size range inch mm proof load psi mpa min.
Since then the local business has developed considerably, positioning itself as one of the fastest growing companies in our industry. From the original jeepl list to the xjlist to the board, a common question comes. 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. Diameterdecimalmetric chart for small diameter fasteners. Sae the main classifications are grades 2, 5, 8, allen heads, and stainless. Please use this form to contact metric bolt for more information regarding our services or sales inquiries. Metric nuts proof loads proof loads of metric nuts coarse and fine threads. Astm, sae and iso grade markings for steel fasteners.
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. The higher the iso numbers are, the stronger the bolt. A short guide to metric nuts and bolts dd thomson rail. Both astm f568m and iso 8981 outline several grades of metric fastener, from low carbonlow strength, up to high strengthheat treated alloy. Identification with the manufacturers mark and the property class is mandatory for hexagon screws 3. We also produce high integrity fasteners and precision components.