For people outside the screw industry, you may be interested in what information the screw name indicates.
When a new employee in charge of procurement operations places an order for screws , you may be worried about what kind of information you need to convey to the supplier, and whether that information is lacking.
Today, I will explain it in the simplest way possible so that even amateurs in this industry can understand it.
There are more or less ways to describe your screw information, depending on your screw specifications and application. If you've read this far, I'm sure you're curious about what's to come. Here are some examples:
Full description of screw
Low-Carbon Steel/4.8/Zinc Cr+3/Hexagon Hex Bolt/JIS B-1180/M12/x1.75P/x50/x20s/
(Half Thread)/Made in Japan/= 20 Pcs
Low carbon steel/4.8/trivalent chromate/hexagon bolt/JIS B-1180/M12/x1.75P/x50/20s/half screw/made in Japan/=20
Each description of the above information will be explained one by one as follows.
Low-Carbon Steel : This refers to the type of material used for the screw in question. It is steel, stainless steel, titanium and other materials suitable for screw making.
If you want to specify a material like S45C(H) or SCM435, you can tell your supplier. However, when only steel or normal steel is indicated, it is often presumed that you want SWCH, SS400 or some other considerably lower carbon steel.
If you don't know what kind of material to use, you can provide information and consult with your supplier about its use. We will do our best to help you find the material that meets your needs.
4.8 : This number indicates how much tension the screw can withstand.
4 = 400n/mm², indicates the maximum tension (ultimate tension) at which the screw will break or break if pulled up to this number.
8 = 80% of 400 n/mm² >> 320 n/mm² , which means 80% of the ultimate tension, ie the optimum tension at which the screw acts like a spring and is flexible. A screw that is pulled too much stretches and deforms, so it cannot return to its original position.
Zinc Cr+3 : This is the plating option. Plating aids in preserving good function and appearance of screws. There are various types of plating depending on the application.
For the above products, Zinc Cr+3 indicates that they are plated in an electro-galvanizing process. The result is a shiny color on the surface (sometimes blue, white or yellow due to chemicals added in the plating process). In addition, it has anti-corrosion properties that comply with RoHS regulations. Zinc plating is one of the most popular among the plating of screws in general.
Hexagon Hex Bolt : This is the hex bolt and this type of screw is commonly used. The head is hexagonal, and a spanner is used when tightening. It often appears everywhere in our daily life, such as mechanical equipment, structures, and automobiles.
JIS B-1180 : This indicates the screw standard. This standard relates to screw specifications and how to make them. There are various standards in the world such as JIS (Japan, Japan), DIN (Germany, Germany), ISO (International), GB (China, China) and ASTM (USA, USA). Each standard was developed by those countries or associations of experts as appropriate to their national industry standards.
These standards have some things in common and some things they don't.
If the supplier does not specify a standard, it is common for common standards or existing standards to be used.
M12x1.75Px50x20s (Half Thread ) :
M12 : "M" indicates metric thread. Metric threads have a thread angle of 60° between threads. "12" means the nominal size of the screw and the unit is millimeters (mm).
1.75P : Indicates that this is the thread pitch (the distance between adjacent threads). This pitch varies depending on the screw size. It is roughly divided into coarse pitch and fine pitch.
50 : This indicates the length of the screw part not including the screw head, but in the case of countersunk screws and setscrews that tighten the object with the full screw length, it indicates the total length from the screw head to the tip. .
20s : Indicates the length of the thread if this is a half thread. This depends on the size and type of screw. Each has a standard length, but you can instruct the supplier according to your company's wishes.
Half Thread : This indicates the cut thread. The unthreaded part is called the shank. Half threads are generally used when the full thread length is not required. For example, it is used for locking by tightening with a nut at the tip through a hole.
Even when neither " Full Thread " or " Half Thread " is specifically specified, you will receive a standard screw of the requested size and length.
For example, if you request Hex Bolt M12x30 , you will receive a "full thread" that is a standard screw of this size and length , but if you request M12x40 , you will receive a "full thread" that is a standard screw of this size and length You will receive a half screw
Therefore, if full/half thread is important, please carefully provide the relevant information to the supplier each time.
Made in Japan : This indicates the country of origin of the screw. Currently, screws are produced in various countries, so you can specify the country of production to the supplier for special reasons.
20 Pcs : This is the quantity for quotation. Generally, the higher the number, the lower the price. If you want to order by the box unit for inventory purposes, you can also instruct the supplier "1 box or 1 carton".
By the way, the most familiar screw generic names are:
4.8 Zinc Cr+3 Hex Bolt M12x50 = 20 pcs
4.8 Trivalent chromate hex bolt M12x50 = 20
Whether you're looking for standard screws with well-known details, or when you don't have special specifications, even this short information is enough.
Whenever you quote a price to your screw supplier, they can provide you with five important pieces of information:
1. Material or material strength
(a) For example, SUS, Steel, 10.9, etc.
2. Plating options
(a) For example, common steel, black oxide, zinc, etc.
3. Fasteners type
(a) For example, hexagon bolts, hexagon socket head bolts, tapping A type, etc.
4. Diameter and length (for bolts/screws)
(a) For example, M12x50
5. Number
(a) For example, 20 pieces, 1 box, 2 cartons, etc.
Needless to say, the more information you provide to your supplier, the more accurately you can receive screws that meet your needs and needs.
How is it going so far? Such a small screw also has these details. When I entered the screw industry, I too was shocked by the above.
In any case, there is still more in-depth information, but for your understanding, I have briefly explained it above. I will do my best to explain more in-depth information to the readers in another article.
If you have read this far, we hope that you have a better understanding of how to obtain an estimate for screws from a supplier. We look forward to seeing you.
If the information I have prepared is missing or incorrect, I will take responsibility myself.
Thank you for reading this article of ours. Thank you for your continued support in the next issue.
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Hanshin Neji Co., Ltd.
international sales team
Natapon Siriraj