Round Head Short Square Neck Bolts ASME B18.5.2.1M
Product: Round Head Short Square Neck Bolts ASME B18.5.2.1M
Property Class:4.6,4.8,5.6,5.8,8.8,10.9,12.9,
A2-70, A4-70,A4-80
Finish:Zinc Plating（Yellow Zinc, Zinc Blue, Rinse Color), Black, Phosphate & Oil, Zinc Phosphate, Hot-dip Galvanized(HDG),Dacromet, Geomet
Material:Steel
Export country: USA, Japan, Australia, Europe and so on
Support customer customization
ASME B18.5.2.1M is a bolt and nut standard formulated by the American Society of Mechanical Engineers (ASME), specifically for the detailed specifications and dimensions of round head square neck bolts. Round head square neck carriage bolts have a round head and square neck, a design commonly used in applications that require a specific head shape and neck configuration. The square neck allows the use of specific tools, such as a wrench or wrench chuck, to turn the bolt, especially when head space is limited or when increased torque transfer efficiency is required. Round head square neck carriage bolts are commonly used in construction, mechanical engineering, automotive and other fields where high strength and reliable connections are required.
Pictures
Product drawing
Product Specification
Size | M6 | M8 | M10 | M12 | M14 | M16 | M20 | |
P | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | |
da min | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 | |
dc max | 14.2 | 18.0 | 22.3 | 26.6 | 30.5 | 35.0 | 43.0 | |
ds | max | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
min | 5.21 | 7.04 | 8.86 | 10.68 | 12.50 | 14.50 | 18.16 | |
e | max | 9.16 | 12.13 | 14.96 | 17.96 | 20.79 | 23.62 | 29.74 |
min | 7.64 | 10.2 | 12.8 | 15.37 | 17.97 | 20.57 | 25.73 | |
k | max | 3.6 | 4.8 | 5.8 | 6.8 | 7.9 | 8.9 | 10.9 |
min | 3 | 4 | 5 | 6 | 7 | 8 | 10 | |
k1 | max | 3 | 3 | 4 | 4 | 4 | 5 | 5 |
min | 2.4 | 2.4 | 3.2 | 3.2 | 3.2 | 4.2 | 4.2 | |
r | max | 0.5 | 0.8 | 0.8 | 0.8 | 1.2 | 1.2 | 1.6 |
min | 0.2 | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.8 | |
s | max | 6.48 | 8.58 | 10.58 | 12.7 | 14.7 | 16.7 | 20.84 |
min | 5.88 | 7.85 | 9.85 | 11.82 | 13.82 | 15.82 | 19.79 | |
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.
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.
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.
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
About the standard:
1. What dimensions and specifications are specified in the ASME B18.5.2.1M standard?
A: The standard specifies the dimensions, tolerances, materials, surface treatment, marking and identification requirements of round head square neck bolts in detail.
Why do bolts need to follow this standard?
A: Following this standard can ensure the quality, reliability and performance of bolts to meet the needs of various industrial and mechanical applications.
2. About materials:
What materials are used for bolts?
A: According to the ASME B18.5.2.1M standard, bolts can use a variety of materials, such as carbon steel, stainless steel, etc. The specific material depends on the application requirements and environmental conditions.
What are the mechanical properties of these materials?
A: The mechanical properties of the materials, such as tensile strength, yield strength, hardness, etc., meet the standards to ensure that the bolts have sufficient strength and durability during use.
3. About surface treatment:
What treatments have been done on the bolt surface?
A: The surface treatment of bolts may include galvanizing, heat treatment, etc. to improve their corrosion resistance, wear resistance and mechanical properties.
4. Regarding dimensions and tolerances:
How are the dimensional tolerances of bolts controlled?
Answer: We use advanced production equipment and precision measuring tools to ensure that the dimensional tolerances of bolts meet the requirements of the ASME B18.5.2.1M standard.
5. About testing:
Have the bolts been mechanically tested?
Answer: Yes, all produced bolts undergo strict mechanical performance testing, including tensile strength, yield strength, etc., to ensure their quality and reliability.
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