1/4 Inch X 2-1/2 Inch Zinc Plated Low Carbon Steel Pan Head Type-Ab Self-Tapping Sheet Metal Screw Best Seller SC collars do not work

SC collars do not work well when th shaft is harder than set screw or when penetration marks on the shaft are not desirable

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1/4 Inch X 2-1/2 Inch Zinc Plated Low Carbon Steel Pan Head Type-Ab Self-Tapping Sheet Metal Screw Best Seller SC collars do not workPan head design is slightly rounded with minimal vertical sides. Square drive is designed to reduce the risk of stripping and allow single handed installation. Additionally reduces the ability to tamper with the fastener once installed.