Fabrication and sales of stainless and other steel products


Site Map


In addition to steel material products, Yamashin Industry provides various completed products-such as hexagon head bolts, hexagon nuts, continuous-thread studs, and wire made of stainless steel, carbon steel, high alloy steel, and general steel. Various product sizes other than those listed in this catalog are available. Please feel free to contact us.

Stainless steel

Stainless steel contains at least 13% chromium and can be broadly classified into chromium based and chromium-nickel based stainless steel. Chromium has the wonderful property of forming a film on the surface as thin as 3/1,000,000 mm when added to steel, thus preventing steel from rusting. The film is very strong, and broken films can even quickly regenerate as long as there is oxygen available. It was invented in 1912, and named "stainless" steel.
Stainless steel is used in various applications, including the chemical industry, petroleum refinery facilities, pulp & paper industries, LNG related facilities, nuclear power facilities, semiconductor manufacturing facilities, food related sanitation facilities, and antirust facilities.

Carbon steel

Carbon steel is an alloy of iron and carbon, and usually contains 0.2% to 2.00% of carbon. Generally it also contains small amounts of silicon, manganese, phosphorus, and sulfur. It is classified by carbon content into low carbon steel, medium carbon steel, and high carbon steel, and also classified by hardness and strength into extra mild steel, mild steel, and hard steel. Hard steel has poor workability for welding etc. due to the effect of heat treatment. It is extensively used for construction machines, industrial machines, shipbuilding, high temperature/pressure facilities, and various plants.

High alloy

Monel is an alloy consisting of at least 63% nickel and about 30% copper. It is used for parts in corrosive environments, such as seawater, high temperatures, and steam because of its excellent corrosion resistance. Its cost is rather high due to the large amount of nickel used.
Inconel has high temperature characteristics, such as thermal resistance, corrosion resistance, oxidation resistance, and creep resistance; and is used in various fields that include the space shuttle, nuclear industry, various parts of industrial turbines, jet engines of aircraft, and high-grade mufflers for automobiles.
Hastelloy is a brand of nickel-based alloy that is highly resistant to high temperatures and corrosion.

General steel

Used in general applications, including construction and household use.

Miscellaneous Info

Hexagon Head Bolt
Hexagon head bolts have a hexagonal-shape head whose width across flats is about 1.5 times as large as the diameter of the thread section. They are tightened using a spanner on the flats.

Thread is a helical ridge formed over a cylindrical or conical surface and mainly used to connect separate parts, or to convert rotational motion to linear motion (and vice versa). Threads cut on the inside of cylindrical or conical objects are known as "female threads," whereas those cut on the outside are called "male threads." They unite with each other in use.
The origin of a thread is uncertain, but is known to have been used in the Greek era. In the 18th century the method for making modern threads was finally established. Mosley in Britain established precision thread duplication technology using a turning machine, and then Mosley's apprentice Whitworth is said to have established mass production technology. More precise turning machines using older models were developed over many years, and the precision of the threads gradually improved upon.
It is thought that threads were first introduced to Japan with a rifle that a Portuguese possessed, who had drifted ashore on Tanegashima Island in 1543. No evidence has been discovered to prove that threads had been used previous to that. In fact, thread structure itself had never been invented or discovered in the Orient.

Thread manufacturing process
Thread manufacturing can be broadly classified into two methods: the machining method and plastic deformation method. Machining includes cutting using a turning machine, threading using a tap or screw cutter die, milling, and grinding, whereas plastic deformation includes thread rolling.
Machining cuts a groove, while thread rolling forms a ridge by plastic deformation to make the thread. The latter is used for making female threads of relatively small diameters and male threads. In particular, making male threads using a rolling machine has been indispensable in mass production of high accuracy. Male threads are formed by rolling the material between two or more thread dies strongly enclosing it. Generally, thread rolling refers to rolling of male screws. Female threads are formed by screwing a thread rod into a hole in the same way as tapping; however, the tapping of thread rolling differs from tapping to cut it in that it does not have any cutting edge to form a groove.
The surface of rolled thread is hardened by compression, and polished by contact with dies; accordingly, exquisite strong threads can be produced.

Generally, screw diameters are specified with the nominal size-the referential outside diameter of the male thread. For example, a unified screw (coarse thread) of a right-hand single thread, 1/4 inch in diameter, and a pitch of 20 threads per inch is specified as 1/4-20 UNC.

| HOME | Steel Products | Fabricating | Products | ISO | Company | Site Map | Contact us |

Head Office : 19-5, 1-Chome, Uemachi, Chuo-ku, Osaka 540-0005 Japan
        Phone : +81-6-6768-0820 Fax : +81-6-6764-5538
Hirakata-Distribution Center : 25-18, 2Chome, Kasuganisimachi, Hirakata City, Osaka, 573-0136 Japan
        Phone : +81-72-859-5305 Fax : +81-72-858-8710
Kanto Offise - Kanto-Distribution Center : 1-1, 2Chome, Intaminami, Misato City, Saitama, 341-0059 Japan
        Phone : +81-48-953-0888 Fax : +81-48-953-7159

Copyright (C) 2009 Yamashin Industry Co., Inc. All rights reserved.

Produced by wizard