ASME B18.5.2.1M Metric Round Head Short Square Neck Bolts
Product: ASME B18.5.2.1M Metric Round Head Short Square Neck Bolts
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 standard for bolts and nuts developed 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 a square neck, and this design is often used in applications that require a specific head shape and neck structure. The square neck allows the use of specific tools (such as wrenches or wrench chucks) to turn the bolt, especially when the head space is limited or the torque transmission efficiency needs to be increased. Round Head Square Neck Carriage Bolts are commonly used in construction, mechanical engineering, automotive and other fields that require high-strength and reliable connections.
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
Our products are widely used in mechanical, electrical, automotive, building construction, railways, bridges, steamships, fire protection and communication system, etc.
Workshop
Certification
Through scientific management, Jinan Star Fastener Co., Ltd. has obtained the 2015 version of ISO9001 quality management system certification. In 2017, the laboratory passed the national CNAS certification. In 2018, the company passed the European CE certification.
Testing Equipment
Our company has a specialized laboratory with digital hardness testers, microscopes, universal testing machines, axial force meters, hydrogen embrittlement detection devices, magnetic particle flaw detectors, metallographic analyzers, carbon and sulfur analyzers and salt spray testing machines, etc. Experimental testing equipment is used to conduct comprehensive testing of the chemical composition of raw materials, product hardness, mechanical properties, coating thickness and corrosion resistance to ensure that all products meet standard requirements and satisfy customers.
Production equipment
Our company has more than 300 production equipment.The product production process includes: Annealing, shot blasting, cold heading, thread rolling, heat treatment, galvanizing, finished product testing, packaging, etc. are all completed in the company.
Packing
FAQ
About the standard:
1. What dimensions and specifications does the ASME B18.5.2.1M standard specify?
A: The standard specifies the requirements for dimensions, tolerances, materials, surface treatment, marking and identification 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., are in accordance with the standard to ensure that the bolts have sufficient strength and durability during use.
3. About surface treatment:
What kind of treatment has the surface of the bolt undergone?
A: The surface treatment of the bolt may include galvanizing, heat treatment, etc. to improve its corrosion resistance, wear resistance and mechanical properties.
4. About dimensions and tolerances:
How are the dimensional tolerances of bolts controlled?
A: We use advanced production equipment and precise measuring tools to ensure that the dimensional tolerance of the bolts meets the requirements of the ASME B18.5.2.1M standard.
5. About the thread:
What is the thread type of the bolt?
A: According to the ASME B18.5.2.1M standard, the thread type of the bolt may include UNC (unified coarse thread) and UNF (unified fine thread), etc. The specific thread type depends on the application requirements.
6. About testing:
Have the bolts been tested for mechanical properties?
A: Yes, all produced bolts have undergone rigorous mechanical property tests, including tensile strength, yield strength, etc., to ensure their quality and reliability.
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