How to Choose the Right Hot Runner Bolt Material
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From the above discussion of hot runner installation torque control and comparison of different bolt materials, accurate selection may be obtained by the following three main dimensions:
Operating temperature matching: below 200℃, use 304 stainless steel; below 250℃, use 316 stainless steel; above 300℃ under high load, use Inconel high temperatur
e alloy to avoid creep loosening at high temperature.
Compatibility with Injection Molding Raw Materials: For corrosive plastic raw materials, choose 316 stainless steel to prevent corrosion, rust and jamming for long-term use.
Cost requirements balance: 316 stainless steel is the general application balance of cost and durability; high-temperature alloy is the high-precision continuous production; 304 stainless steel is the low-load extremely cheap budget.
Selecting bolts based on these considerations will be properly suited to your hot runner operating circumstances and will considerably reduce the likelihood of bolt failure.
