Lincoln Service Parts 2 › Lincoln Electric 9SS21400-31 #6 X 0.75" THREAD FORMING SCREW [15] S21400-31 Lincoln Electric 9SS21400-31 #6 X 0.75" THREAD FORMING SCREW [15] S21400-31 Sale Price: $2.48 Original Price: $2.85 #6 X 0.75" THREAD FORMING SCREW [15] PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 15 Add To Cart Added! #6 X 0.75" THREAD FORMING SCREW [15] PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 15