Lot of 20 SVSQS-M12-40 NBK Cross Recessed Flat Head M12 length 40mm Vacuum Vented Screws Made in JapanLot of 5 SVSQS M12 40 NBK Cross Recessed Flat Head M12 length 40mm Screws SVSQS M12 40 NBK Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole. Pack of 20 NBK Hex Socket Head Cap Screws with Captive Washer and Ventilation Hole. Part Number M L D1 D L1 B t T (Approx.) d (max.) SVSQS M3 5 M12 40MM 18MM 24MM 12MM 10MM 2. 5MM 3 3 The ventilation hole easily releases gas trapped in the screw holes of equipment and machines, and supports