This is a A-4012405C Spark Plug PN: 4012405CMain Description As Following : A-4012405C Spark Plug P.N: 4012405C Dim A (1): Champion D16Dim B (2): 18mm ThreadDim C (3): 1/2" ReachDim D (4): 7/8" Hex Shoulder Stocked As: A-21A808 Found in Section & Models : Ignition & Electrical Parts > Engine Related Parts, Case-IH INDUSTRIAL/CONSTRUCTION: T340, Case-IH INDUSTRIAL/CONSTRUCTION: 3500A, Case-IH TRACTOR: HYDRO 70, Case-IH TRACTOR: HYDRO 86, Case-IH TRACTOR: VA, Case-IH TRACTOR: VAC, Case-IH TRACTOR: VAO, Case-IH TRACTOR: W4, Case-IH TRACTOR: W6, Case-IH TRACTOR: 100, Case-IH TRACTOR: 130, Case-IH TRACTOR: 140, Case-IH TRACTOR: 200, Case-IH TRACTOR: 230, Case-IH TRACTOR: 240, Case-IH TRACTOR: 2400, Case-IH TRACTOR: 2444, Case-IH TRACTOR: 2500, Case-IH TRACTOR: 2504, Case-IH TRACTOR: 300 Associated Items : New Also A-IH-O-T340, A-IH-O-T340G6HBG, A-IH-P-DROTT340, A-IH-P-HDTILL, A-IH-P-T340, A-IH-P-T340G6HBG, A-IH-O-3500APAYL, A-IH-P-ENGD239, A-IH-P-3500ATLB, A-IH-S-ENGD155, A-IH-S-ENG157, A-IH-S-34003500, A-IH-O-BATTIGN, A-IH-O-70HYDRO, A-IH-P-ENG56CYL, A-IH-P-ENG6CYLG, A-IH-P-666686, A-IH-S-ENG3400, A-IH-S-ENG6CYLG, A-IH-S-HYDROTRN And : Dim A (1): Champion D16 Dim B (2): 18mm Thread Dim C (3): 1/2" Reach Dim D (4): 7/8" Hex Shoulder