Hollow Hex Pipe Plug

When choosing the appropriate material for the Hollow Hex Pipe Plug, various factors need to be taken into account, including the usage environment, compatibility with the medium, mechanical load, installation and maintenance frequency, and cost.

（1）Work environment

The customer asks himself: Is the Hollow Hex Pipe Plug exposed to dampness, salt spray, chemicals or outdoor conditions?

Material Selection Recommendation:Dry room → Carbon steel + galvanized / blackened (lower cost)

Damp/road salt spray → Stainless steel A2 (304) or brass

Ocean/Chemical Plant → Stainless Steel A4 (316L)

（2）Work pressure and mechanical load

The customer asks himself: What is the maximum pressure of the system? Is there any high-frequency vibration?

Material Selection Recommendation:Low pressure (< 10 MPa, such as in the engine oil pan of a car) → Carbon steel 4.8/6.8 or Brass

Medium pressure (10–63 MPa, industrial hydraulic) → Carbon steel 8.8 or Stainless steel A2-70

High pressure (> 63 MPa) → Carbon steel 10.9/12.9 or Alloy steel

（3）Complementary to the material of the housing

The customer asks himself:What material is the shell into which the Hollow Hex Pipe Plug is screwed - cast iron, steel, aluminum alloy, brass or plastic?

Material Selection Recommendation:The shell is made of aluminium alloy → It is recommended to use brass or stainless steel with anti-sticking agent; avoid aluminium on aluminium (which is prone to sticking together)

The shell is made of cast iron/steel → Carbon steel, stainless steel, and brass are all available.

The shell is made of brass/bronze → brass or stainless steel

The shell is made of plastic → brass or aluminum alloy (light, avoid excessive torque)

（4）Installation and maintenance frequency

The customer asks himself:How often should the Hollow Hex Pipe Plug be removed? Does the sealing part need to be replaced during each maintenance?

Material Selection Recommendation:Frequent disassembly (daily inspection for racing cars and construction machinery) → Brass or stainless steel (wear-resistant, rust-proof)

Regular maintenance (for household cars) → Carbon steel (replace copper gaskets each time, low cost)

Rarely disassembled (once every few years) → Stainless steel or brass (to prevent long-term rusting)

（5）Is magnetic separation of iron filings required?

The customer asks himself:Is it necessary to protect the engine/transmission/hydraulic system from damage caused by ferromagnetic abrasive particles?

Material Selection Recommendation:Require magnetism → Choose carbon steel or aluminum alloy body + built-in neodymium magnets

Not necessary → Select based on other factors

（6）Cost budget

The customer asks himself:How sensitive are the customers to the unit price?

Material Selection Recommendation:Carbon steel + galvanization (the most economical option)

Carbon steel + blackening treatment

Brass

Stainless steel A2 (304)

Stainless steel A4 (316) (the most expensive)

The price of aluminum alloy lies between that of carbon steel and brass, but its strength is relatively low.