Trapezoidal thread ring gauges and plug gauges with thread angle 30°,Tolerance class: Internal thread 6H, 7H, 8H; External thread: 6e, 7e, 8c,6H, 6e for Fine tolerance quality; 7H, 7e for medium tolerance quality;8H, 8c for Coarse tolerance quality,Standard class of fit: Plug gage 7H & ring gauge 7e; More Details Please contact: edwin@, WhatsApp: 86 139 6216 8423
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