According to the following four ball friction tester related standards, provide the standard steel ball described in the standard, ball diameter 12.7 mm, surface treatment in line with national standards.

I. compilation of national standards for testing methods for petroleum and petroleum products 2005

1) GB/T 3142 - 1990 "determination of lubricant carrying capacity (four ball method)"

2) GB/T12583 "determination of lubricant extreme pressure properties (four ball method)"

Two. Petroleum and petroleum products test methods industry standard compilation 2005.

3) SH/T 0189 - 92 "lubricating oil resistance test method (four ball machine)"

4) SH/T 0202 - 92 "extreme pressure test method for lubricating grease (four ball machine)"

5) SH/T 0204 - 92 (2004) "lubricating grease antiwear performance test method (four ball machine method)"

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