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High Strength Hex Bolt
QS Fastener: High Strength Hex Bolt
Name: High Strength Hex Bolt
Material: A193 B7
Standard: DIN 933
Class: 8.8
Surface: PTFE
Feature: High Yield Strength and Durable Strength
Material: A193 B7
Standard: DIN 933
Class: 8.8
Surface: PTFE
Feature: High Yield Strength and Durable Strength
Quantity
This High Strength Hex Bolt is strictly manufactured in accordance with DIN 933 standard, using ASTM A193 B7 alloy steel material, and its mechanical properties reach Class 8.8 grade. Its microstructure is uniform, offering excellent high yield strength and (sustained tensile strength), effectively resisting creep and relaxation under high-temperature and high-pressure working conditions. The surface of this High Strength Hex Bolt is treated with PTFE (polytetrafluoroethylene) coating, which not only provides excellent chemical corrosion resistance but also endows the bolt with self-lubricating properties, enabling precise control of the preload torque coefficient and preventing galling. It is widely used in petrochemical industry, valve and flange connections, and heavy machinery assembly, making it an ideal choice to ensure long-term fastening and safe reliability of critical structures.
The PTFE coating provides an extremely low friction coefficient (typically between 0.05 and 0.10). When fastening stainless steel or alloy steel bolts, it effectively isolates direct metal-to-metal contact between threads, fundamentally eliminating the"galling"phenomenon under high-pressure tightening, and significantly reducing the risk of fracture during disassembly and maintenance.
For this type of High Strength Hex Bolt, the self-lubricating properties of the coating result in very high torque conversion efficiency and small dispersion during the tightening process. In applications where the torque method is required to control assembly quality, it ensures that the axial preload force for each tightening is highly consistent, which is critical for preventing leakage in flange sealing.
PTFE is almost inert to all industrial chemicals and solvents. The coating acts like a"plastic jacket"for the alloy steel High Strength Hex Bolt, enabling it to resist corrosion from acids, alkalis, salt spray, and organic solvents in scenarios where stainless steel is either too costly or lacks sufficient strength. The coating typically operates stably within a range of -190°C to +260°C without significant degradation of its lubricating properties, making it suitable for both cryogenic medium pipelines and high-temperature steam applications. Compared to applying molybdenum disulfide grease or anti-seize compounds, the PTFE coating is a solid dry-film lubricant that is not easily squeezed out under high pressure or lost due to drying. It allows this High Strength Hex Bolt to be disassembled and reassembled multiple times without the need for re-lubrication, thereby reducing maintenance labor costs.
PTFE is almost inert to all industrial chemicals and solvents. The coating acts like a"plastic jacket"for the alloy steel High Strength Hex Bolt, enabling it to resist corrosion from acids, alkalis, salt spray, and organic solvents in scenarios where stainless steel is either too costly or lacks sufficient strength. The coating typically operates stably within a range of -190°C to +260°C without significant degradation of its lubricating properties, making it suitable for both cryogenic medium pipelines and high-temperature steam applications. Compared to applying molybdenum disulfide grease or anti-seize compounds, the PTFE coating is a solid dry-film lubricant that is not easily squeezed out under high pressure or lost due to drying. It allows this High Strength Hex Bolt to be disassembled and reassembled multiple times without the need for re-lubrication, thereby reducing maintenance labor costs.
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