GB 898 bm=1.25d Double End Studs

GB 898 bm=1.25d Double End Studs is the national standard for double-ended studs. In this standard, bm=1.25d is a specific size. Specifically, bm usually refers to the thread length at one end of the screw hole, also called the screw-in end. while d is the nominal diameter of the stud. Therefore, bm=1.25d means that the thread length of the screw-in end is 1.25 times the nominal diameter of the stud. It is very important to ensure the matching and tightening effect of the stud and the screw hole, because it determines the depth of the stud being screwed into the screw hole and the size of the tightening force.

Pictures

Product drawing

Product Specification

Some introduction about our company

Application

Jinan Star Company specializes in the production of fastener products. Our bolts, nuts and other products are widely used in machinery, railways, automobiles, construction, electrical, bridges, communications, firefighting and other industries.

Certification

Jinan Star Fastener Co., Ltd. has obtained the 2015 version of ISO9001 quality management system certification through the scientific management of leaders of various departments and the pursuit of high quality for bolts and other fasteners. In addition, the laboratory owned by Star Company has obtained the certification in 2017. It passed the national CNAS certification in 2018, and the company passed the European CE certification in 2018.

Workshop

The workshop of Jinan Star Fastener Co., Ltd. is the core area of the company's production and manufacturing, with advanced production equipment. The reasonable layout of the workshop and the scientific production process ensure the efficient production and high-quality output of fastener products.

Production equipment

In order to meet the needs of different customers, the company has introduced a series of advanced production equipment, such as multi-station cold heading machines, thread rolling equipment, heat treatment equipment, shot blasting machines, sand blasting machines, electroplating lines and other surface treatment equipment, and fully automatic packaging equipment. These equipment not only improve production efficiency, but also ensure the consistency and stability of product quality.

Testing Equipment

Jinan Star Fastener Company attaches great importance to product quality and is equipped with complete quality inspection equipment, such as tensile testing machines, torque testers,metallographic microscopes, optical projectors, salt spray test chambers, coating thickness gauges, etc., which are used to test the tensile strength and elongation of fastener products and evaluate the mechanical properties of products. These equipment ensure that every link from raw materials to finished products can be strictly controlled in quality.

Packing

FAQ

1. What standards and specifications does the national standard GB 898 bm=1.25d Double End Studs comply with?

This double-ended stud fully complies with the national standard 898, where bm=1.25d means that the thread length at the screw-in end is 1.25 times the nominal diameter of the stud. Our products are produced and tested in strict accordance with national standards to ensure product quality and performance.

2. How to choose the appropriate stud specification?

When selecting stud specifications, factors such as screw hole diameter, required tightening force, usage environment, etc. need to be considered. We can recommend suitable stud specifications for you based on your specific needs and application scenarios.

3. What is the material of the national standard 898 double-headed stud bm=1.25d?

The national standard 898 double-ended studs we provide are usually made of high-quality carbon steel, stainless steel and other materials to meet the needs of different industries and fields. You can choose the appropriate material based on the usage environment and requirements.

4. What is the fastening effect of the national standard 898 double-headed stud bm=1.25d?

The tightening effect of national standard 898 double-headed studs is very reliable. The thread length of the screw-in end is 1.25 times the nominal diameter, which can provide sufficient tightening force to ensure the stability and safety of the connection.

5. How about the after-sales service for GB 898 bm=1.25d Double End Studs?

We provide complete after-sales services, including product consultation, technical support, quality assurance, etc. If you encounter any problems during use, please contact us in time and we will solve it for you as soon as possible.