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Bolt And Nut Specification Pdf

bolt and nut specification pdf

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Published: 12.06.2021

About Blog Location. Nylon Insert Jam Lock A nylock nut with a reduced height. High-Strength Bolt.

nut and bolt drawing pdf

This short guide is intended to give a very basic introduction to ISO metric nuts and bolts. It is intended for those working in plant and machinery maintenance to give enough information on to ensure that correct replacement parts are identified and used. Few parts are as critical in the assembly of modern machinery as the nuts and bolts which hold it all together and, at first sight, it seems that all metric bolts are basically the same.

In fact, of course, nothing could be further from the truth. There are no fewer than 5 different threads for different applications and 10 different standard strength grades defined for each size of bolt. The situation on is almost as complex with metric nuts which come in a wide variety of types full, thin, nyloc, castellated….. The difference in strength between different grades is quite dramatic: the highest standard grade being capable of carrying more than three times as much load as the lowest grade.

If you are responsible for repairing and maintaining machinery, particularly if that machinery is involved in lifting operation or other safety critical applications then you will be aware of the importance of fitting the right parts in the right way. This short guide is intended to give you the information you need to be able to correctly identify and use the metric nuts and bolts most commonly found in plant and machinery.

Every effort has been made to ensure that the information contained in this document is correct but no guarantee can be given nor liability accepted for errors or omissions. We are always grateful for any comments or criticisms of our technical publications and are happy to offer advice on all aspects of plant and machinery maintenance.

Although various special threads are defined by the ISO standard only two are in common use in most machinery, the others are mainly used in specialist equipment such as precision instruments, optical instruments, etc. The pitch of a thread is the distance between two adjacent threads and is measured in millimetres. The most common thread diameter and pitch combinations found in plant and machinery are listed in the table below:. Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength.

On the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3. The bolt head should also have a code — normally two or three letters — indicating the manufacturer. Usually the markings are on the top of the bolt head but sometimes they are on the side.

The first number gives the breaking strength of the steel in the bolt. For example, a grade Similarly a grade 8. A bolt will begin to stretch before it finally breaks, the second number on the head of the bolt indicates how much of the breaking strength the bolt can stand before it starts to stretch.

Similarly a grade 9. The strength grade marking is more difficult to see on metric nuts, sometimes it is given as a number, sometimes as a pattern of a dot and a line where the position of the line indicates the grade like the hands of a clock.

Where the grade is given as a number it may be stamped on the top of the nut or on one of the flat sides. Clock face grade marks are shown in the illustration right.

Put the dot at the twelve O-Clock positions and the line shows the grade. The rule is that the grade of the nut should always be the same as the bolt grade or one grade higher so: a grade 8. A grade As we said on page 4, if a bolt is gradually loaded there comes a point when it begins to stretch and after that a point where it actually breaks. The proof load is usually considered to be the absolute maximum load which a bolt should be asked to carry.

In practice, manufacturers will design their machinery so that the bolts carry a lot less than the proof load to give a good safety factor to the design. The maximum recommended torques given in the table below assume that the threads are lightly oiled.

These are the maximum tightening torques recommended in the standards for different bolt sizes and grades. Fine threads are often used where a bolt is screwed into a soft metal block, such as an aluminium casting, the thread in the block may be far weaker than the bolt and a lower torque is almost always required to avoid stripping the threads. Many factors affect the strength of threads in components including how the thread is produced, the surface finish and the accuracy of the thread shape.

The strength of the threaded connection is the strength of the weakest part so, for example, if a high tensile bolt is screwed into a softer, more ductile material such as an aluminium alloy or low carbon steel part then it will be the softer part which dictates the maximum torque which can safely be applied to the bolt. Similarly, if the thread is made by drilling and tapping a hole the size of the drilled hole may vary depending on how accurately the drill has been sharpened and how worn the drill is, the hole might not be precisely straight and the tap might be blunt or worn.

All these factors will add up to produce a thread which does not fit the bolt exactly as it should and the joint may therefore be weakened. Design Engineers have to consider all these factors and may decide that a lower torque is applicable. This is commonly the case in lifting devices where high factors of safety are required. Correct Spanner and Allen Key sizes are given in the table below for the normal range of bolt and nut sizes found in plant and machinery.

To minimise the risk of a spanner slipping and marring the corners of a fastener, it is good practise to use ring spanners or the ring end of a combination spanner whenever possible. Metric bolts are made fractionally under their stated size, for instance an M16 bolt will have a shank diameter of typically This means that a 16mm bolt will fit through a 16mm hole but to allow for misalignment between parts it is common practice to drill bolt holes slightly larger.

These are known as clearance holes. Typical clearance hole sizes are given in the table below along with the correct tapping hole size for each size of standard and fine pitch thread. With metric threads tapping drill size is easy to work out because it is the bolt diameter minus the thread pitch so, for example, a standard pitch M16 bolt has a pitch of 2.

The table below gives tapping drill sizes for threads corresponding to the thread pitches given in the table on page 3. When tapping a hole, particularly M10 and smaller, remember to keep removing the tap from the hole and blowing away the swarf to prevent the tap jamming and breaking.

Thomson Engineering Design produce an unparalleled range of machines, attachments and tools for track renewal and maintenance.

Hit enter to search or ESC to close. Answers to the most Frequently Asked Questions. Introduction: Metric Nuts and Bolts. Standard and Fine Pitch Threads. Size Pitch std Pitch fine M5 0. How the Diff erent Strength Grades Compare. Maximum Tightening Torques. Spanner and Allen Key Sizes.

Bolt & Nuts Dimensions

Nuts and bolts are essential fastenings, critical in the safe assembly of machinery, equipment, furniture and much more. In this brief guide we provide an introduction to standard ISO metric sizes for nuts and bolts which will hopefully help dispel any confusion. BS defines the limits and tolerances for ISO screw thread gauges. The standard is divided into two parts. But the size of a metric fastener is more accurately specified using diameter, pitch and length dimensions, in millimeters. For nuts the size dimensions used are simply diameter and pitch. This abbreviated format omits the pitch definition which means that the bolt has a coarse thread.

This short guide is intended to give a very basic introduction to ISO metric nuts and bolts. It is intended for those working in plant and machinery maintenance to give enough information on to ensure that correct replacement parts are identified and used. Few parts are as critical in the assembly of modern machinery as the nuts and bolts which hold it all together and, at first sight, it seems that all metric bolts are basically the same. In fact, of course, nothing could be further from the truth. There are no fewer than 5 different threads for different applications and 10 different standard strength grades defined for each size of bolt. The situation on is almost as complex with metric nuts which come in a wide variety of types full, thin, nyloc, castellated…..

A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction with slight elastic deformation , a slight stretching of the bolt, and compression of the parts to be held together. In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers , jam nuts , specialist adhesive thread-locking fluid such as Loctite , safety pins split pins or lockwire in conjunction with castellated nuts , nylon inserts nyloc nut , or slightly oval-shaped threads. Square nuts, as well as bolt heads, were the first shape made and used to be the most common largely because they were much easier to manufacture, especially by hand. While rare today [ when?

METRIC NUT SIZES

Hex bolts from ITA Fasteners are mostly used in repair and construction work. As the name implies, they have a hexagonal head and come with machine threads for a firm and rough handling. They come in a wide range of different hex bolt sizes for custom applications depending on its dimensional requirements.

Use the dimensions of your bolt to determine the appropriate size nut. If you own a Machinery's Handbook, now would be a good time to get it out. Metric nut comparison. American Wrench Size Chart. Coarse Thread Bolts.

Overall Rating

 - Но как только я узнаю, что вы следите за мной, я немедленно расскажу всю эту историю журналистам. Я расскажу, что Цифровая крепость - это большая липа, и отправлю на дно все ваше мерзкое ведомство. Стратмор мысленно взвешивал это предложение. Оно было простым и ясным. Сьюзан остается в живых, Цифровая крепость обретает черный ход. Если не преследовать Хейла, черный ход останется секретом. Но Стратмор понимал, что Хейл не станет долго держать язык за зубами.

Она проехала по Кэнин-роуд еще сотню метров и въехала на стоянку С, предназначенную для сотрудников. Невероятно, - подумала она, - двадцать шесть тысяч служащих, двадцатимиллиардный бюджет - и они не могут обойтись без меня в уик-энд. Она поставила машину на зарезервированное за ней место и выключила двигатель. Миновав похожую на сад террасу и войдя в главное здание, она прошла проверку еще на двух внутренних контрольных пунктах и наконец оказалась в туннеле без окон, который вел в новое крыло. Вскоре путь ей преградила кабина голосового сканирования, табличка на которой гласила: АГЕНТСТВО НАЦИОНАЛЬНОЙ БЕЗОПАСНОСТИ (АНБ) ОТДЕЛЕНИЕ КРИПТОГРАФИИ ТОЛЬКО ДЛЯ СОТРУДНИКОВ С ДОПУСКОМ Вооруженный охранник поднял голову: - Добрый день, мисс Флетчер. - Привет, Джон.

 Мистер. Беккер узнал голос. Это девушка.

 - У нас приказ. Мы отчитываемся перед директором Лиландом Фонтейном, и только перед. Фонтейна это позабавило. - Вы знаете, кто. - Какая разница? - огрызнулся светловолосый.

Только подумайте. Беккер встревожился: - Так кольца у вас. - Боже мой, конечно.

Стратмор хмыкнул.

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