Bolts are generally made of medium carbon, plain or low alloy steels depending on the grade (property class). Higher grades are usually made of low alloy steels. Some grades have small additions of Chromium or Boron.
The use of a wrench is to tighten and loosen nuts and bolts.
its a steel material used in pipes
GM500M: Mechanical and Material Requirements for Metric Externally Threaded Fasteners. This standard covers the mechanical and material requirements for six property classes of carbon and alloy steel externally threaded metric fasteners in nominal thread diameters M1.6 to M36, inclusive, suitable for use in general engineering applications. Products included are bolts, screws, studs, U-bolts and sems and hardness of HRC39 max. Tapping screws, thread rolling screws, self drilling tapping screws and set-screws are NOT included. The term "stud" as referred to herein applies to a cylindrical rod of moderate length, threaded on either one or both ends or throughout its entire length. It does not apply to headed, collared or similar products which are more closely characterized by requirements shown herein for bolts. For specification purposes, this standard treats U-bolts as studs. Thus, wherever, the word "studs" appears, "U-bolts" is also implied. U-bolts covered by this standard are those used primarily in the suspension and related areas of vehicles. (Designers should recognize that the "U" configuration may not sustain a load equivalent to two bolts or studs of the same size and grade; thus actual load carrying capacity of U-bolts should be determined by saddle load tests.) Requirements for the 6 property classes, 4.6, 4.8, 5.8, 9.8, and 10.9 are essentially identical with requirements given for these classes in ISO 898/1 and ASTM F568.
An alloy of aluminium is used usually magnellium
he use bronze he use wood.
For fastening together two pieces of material.
Clay
The radiation comes from the material used.
Dry graphite
The material used in making a puffer coat is typically a synthetic fabric called nylon or polyester, filled with insulating material such as down or synthetic fibers to provide warmth and insulation.
i think from different gases !!!!!
It is used for making petrochemicals
tungsten or sometimes copper
Silicon
cotton
mud and fibers
Leather and plastic