newstime：2021-08-03 08:27:33 Click： Source：
When installing a valve, a wrench is often used, so which one should we choose for the bolt on the valve?
The steel stamp number printed on the wrench or socket is the opposite side size, which is the S value of the threaded connection fastener specifications found in the mechanical design manual. Some people often don’t know it, and they think it is the thread diameter. As a result, the wrench appears It does not match the screw/bolt/nut.
1. Comparison table of opposite side size of metric external hexagonal bolts and socket (torx) wrenches:
2. Size comparison table of metric hexagon socket bolts and hexagon socket wrenches:
The size of the screw corresponds to the four sides of the Allen wrench. In order to let you distinguish the corresponding size of the screw and the Allen wrench, as well as the size of the hole to be drilled, the size of the tap should be used. The following is some experience for your reference: Tap the bottom hole of the thread Calculation: Brittle materials (cast iron, bronze, etc.): drilling diameter d0=d (thread outer diameter) -1.1p (pitch); plastic materials (steel, copper, etc.): drilling diameter d0=d (thread outer diameter) -p (pitch)
Commonly used open-end wrench specifications are: 7, 8, 10, 14, 17, 19, 22, 24, 27, 30, 32, 36, 41, 46, 55, 65;
The corresponding thread specifications are: M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, M42
The minimum specification of a full set of Allen wrenches is 3, and the corresponding relationship is S3=M4, S4=M5, S5=M6, S6=M8, S8=M10, S10=M12, S12=M14-M16, S14=M18-M20, S17=M22-M24, S19=M27-M30, S24=M36, S27=M42.
The calculation method of the thread bottom hole diameter before tapping: For brittle materials, the basic size is -1.0826 pitch, and for plastic materials, the basic size of the thread-pitch +0.1. The brittle material is in a pure cutting state when tapping, and the bottom hole size is the diameter of the bottom circle of the thread. When the plastic material is tapped, due to the plastic deformation after the material is stressed, the material will move to the small diameter of the thread, so the bottom hole should be appropriately enlarged . For threaded holes below M6, regardless of the nature of the material, the basic size-pitch is uniformly used. Generally, the major diameter D of the bolt minus the pitch is used for drilling.
1. If the customer has special requirements for the product, the following instructions must be provided in the order contract:
(a).Structure length; (b) Connection Type; (c) Nominal diameter;
(d) Product use medium and temperature and pressure range;
(e) Test, inspection standards and other requirements.
2. Our factory can assemble various driving devices according to customer requirements.
3. If the customer needs to customize a special valve, the meaning and requirements of the model should be correctly explained, and the contract should be signed under the conditions that the supplier and the buyer understand the same.
4. For futures and order customers, please call us and tell us the required valve model, specification, quantity, delivery time and location in detail. And prepay 30% of the total contract amount for the preparation of production materials.
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