... 160 4Grade:8.8,10.9,12.9 Torshear type high strength nut and bolt washer for steel structures I ... For Bolt: THE SAMPLE OF THIS KIND OF HIGH STRENGTH BOLT, GB/T 3632 Our strength on exporting ... .From 2006, we have manufactured the products of high speed railway and now they are being used. We ... viewTesting equipmentsWorkshop Welcome your visit! Railway Torshear type high strength washer nut and bolt