Thread Pitch: M3 0.5; M4 0.7; M5 0.8; M6 1; M8 1.25; M10 1.5; M12 1.75; M14 2; M16 2; M20 2.5. Round Long Nuts Allthread Connector Sleeve Coupling. Material: A2 304 Stainless Steel.
eBay