Campbell Hausfeld Medium Barrel Air Hammer (CL153400AV) The Campbell Hausfeld air hammer (CL153400AV) delivers 3,500 blows per minute with a 2 5/8-inch stroke length for fast and powerful cutting action Coil spring retainer for quick chisel changes during automotive exhaust work, general cutting, chipping and scraping. Finish your projects faster and easier with Campbell Hausfeld - The Air Power Expert. 2-5/8 inch stroke length, accepts 0.401 round shank chisels, Blows/Min.: 3500, Air Consumption Avg.: 11 SCFM, Air Consumption Cont.: 18.4 SCFM, Air Inlet: 1/4 in. NPT