Materials and surface treatment of DIN931 hex bolts: Carbon steel and stainless steel are used for DIN931 hex bolts.
By property class, the carbon steel outer hex bolts are divided into 5.6, 8.8, 10.9 and 12.9.
The carbon steel hex bolt’s surfaces are treated by electroplating with plain blue white zinc, plain color zinc, hot zinc, environmental color zinc, environmental blue white zinc, and environmental Dacromet, as well as high salt fog for 72H, 96H, 120H, 300H, 360H, and 720H. By property class, the stainless steel outer hex bolts are divided into A2-50, A2-70, A4-50, A4-70, C3, and C4.
The following table shows the stainless steel groups and chemical compositions:
Regular dimensions of DIN931 hex bolts
Application scope of DIN931 hex bolts: The DIN931 outer hex bolt with coarse threads is often used together with a nut for a threaded connection between two parts, and this is a detachable connection.
The outer hex bolts with fine threads and coarse threads function the same, except that the former has better self-locking and thus is used for the positions subjected to large impacts and chocks or alternating loads or for adjustments of fine-tuning mechanisms.
When using an outer hex bolt, pay attention to looseness prevention, or normal operation will be affected and even an accident will occur.
The looseness prevention methods include looseness prevention via friction, mechanical looseness prevention, and other looseness prevention measures.
Featuring easy connection, simple mounting, convenient removing and high efficiency.
The outer hex bolts are widely used for production, installation and maintenance in various industries, such as mechanical equipment, electronic products, communication devices, furniture fitment, and construction.
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