MBS SHOP › 12328-B - MBS Matrix III King Pin Nut (ea.) - M8 Image 1 of 1 12328-B - MBS Matrix III King Pin Nut (ea.) - M8 $0.50 M8 Lock Nut for Matrix III CNC kingpin Get notified by email when this product is in stock. Sign up to receive news and updates. Quantity: Add To Cart Added! M8 Lock Nut for Matrix III CNC kingpin