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Code Nominal thread diameter, mm​ Length, mm Size "turnkey", mm  Drilling thickness, mm Quantity in the package, pcs WS4820t2Ef 4.8 20 8 ..

Code Nominal size threads, mm Length, mm Size under wrench, mm Thickness drilling, mm The diameter of the washer, mm Quantity packaging, pcs SMS556390t12Ef 5,5/6,3..