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High Strength Hexagon Socket Bolts DIN 913, 914, 915, 916 - Quality China Suppliers & Factory
How to use bolts
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Common Specifications
Thread diameters usually include M1.6, M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M16, M18, M20, etc. Common screw lengths include 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 16, 18, 20, 25, 30, 35, 40, 45, 50, 60, etc.
Materials
Including alloy steel, carbon steel, stainless steel, plastic, copper, etc.
Standards
Such as GB 77-2000, ISO 4026-2003, ANSI/ASME B18.2.1, etc.
Tightening bolts with different end shapes are suitable for different occasions:
The contact surface is flat and does not damage the surface after tightening. It is suitable for hard surfaces or parts that often need adjustment.
It is suitable for use on parts with lower hardness by using its sharp cone to press against the contact surface.
The end is concave, generally used to fix the shaft end, and the top tightening surface is mostly cylindrical, suitable for parts with high hardness.
Its specific usage scenario depends on actual needs.
The specifications of tightening bolts mainly include the diameter, length, pitch, end shape, and material of the bolt. These specification parameters will significantly affect their application, as shown below:
1. Diameter
The larger the diameter of the bolt, the stronger its load-bearing capacity is usually. In situations where large loads need to be borne, such as in large mechanical structures, larger diameter fastening bolts are used; In equipment with smaller loads, using smaller diameter fastening bolts can meet the requirements.
2. Length
The length determines the depth to which the bolt can penetrate into the object being fastened. Longer bolts can provide better fastening and stability, but in limited space, it may be necessary to choose shorter bolts.
3. Pitch
Tightening bolts with smaller pitch have relatively better self-locking performance and are suitable for situations with less vibration and no need for frequent adjustment; Bolts with larger pitch have faster screw in speed and are suitable for parts that require quick installation or frequent adjustment.
4. End shape
Different end shapes have different functions and application scenarios. For example, flat end fastening bolts have minimal damage to the contact surface during tightening, and are commonly used in situations where surface hardness is high or surface integrity is required; Cone end tightening bolts can better embed the fastened object and are suitable for materials with lower hardness; Concave end tightening bolts are suitable for fixing cylindrical surfaces such as shaft ends; The convex end tightening bolt can be flexibly applied according to specific situations.
5. Material
The material determines the strength, corrosion resistance, and wear resistance of the bolt. In harsh environments such as high temperature and corrosion, it is necessary to choose materials with corresponding resistance, such as stainless steel or high-temperature alloy materials for tightening bolts.
Installation Guidelines for Washers & Bolts:
For general bolt connections, flat washers should be placed under the bolt head and nut to increase the pressure-bearing area.
Flat washers should be placed on the bolt head and nut side respectively, and there should generally be no more than 2 flat washers placed on the bolt head side, and there should generally be no more than 1 flat washer placed on the nut side.
For bolts and anchor bolts designed with anti-loosening requirements, the nut or spring washer of the anti-loosening device should be used, and the spring washer must be set on the side of the nut.
For bolt connections bearing dynamic loads or important parts, spring washers should be placed according to the design requirements, and spring washers must be set on the side of the nut.
For I-beams and channel steels, inclined washers should be used when using inclined plane connections to make the bearing surface of the nut and bolt head perpendicular to the screw.
Frequently Asked Questions
What are the common standards and materials for tightening bolts?
Tightening bolts are manufactured according to standards such as GB 77-2000, ISO 4026-2003, and ANSI/ASME B18.2.1. They are available in materials including alloy steel, carbon steel, stainless steel, plastic, and copper to suit different load and environmental requirements.
Which set screw end shape should I choose for a surface that needs frequent adjustment?
You should choose the Hexagonal flat end set screw (DIN 913). Its contact surface is flat, ensuring it does not damage the mating surface during tightening, making it ideal for parts that require regular adjustment.
How do bolt diameter and pitch affect their application?
Larger diameter bolts provide higher load-bearing capacity for heavy structures. A smaller pitch offers superior self-locking capabilities in high-vibration applications, whereas a larger pitch allows for faster installation and adjustment.
What is the correct way to place flat washers on a bolt connection?
Flat washers should be placed under both the bolt head and the nut. As a general rule, use no more than 2 flat washers on the bolt head side, and no more than 1 flat washer on the nut side to ensure proper load distribution.
When and where should spring washers be installed?
Spring washers are required for connections bearing dynamic loads, critical components, or when anti-loosening designs are specified. They must always be positioned on the side of the nut.