Abstract: A band severing method and tool having a band severing head made entirely in one piece from a unitary high strength body of metal. The body of the head has a continuous slot formed transversely therethrough and open at the laterally opposite ends thereof and at an end opening whereby the tool body can be receivingly engaged with a band run by entry of the band run edgewise through the slot. Slot band engaging edges on the head body are oriented at a convergent taper angle in the direction to the body axis and have a plurality of band run engaging teeth arranged in a serrated tooth pattern therealong. With the band run held so engaged with a portion of the run trapped in the body slot, the slot edges impart a band severing rupture in the band run at its engagement along the passageway slot edges transversely of the band in response to application of torque to the head operable to cause bodily rotation of the head body in one continuous direction of rotation.