平形 meaning in English

concavo-plane
hiragata
hirakata

Bonded abrasive products . disc wheel with inserted nuts
普通磨具.螺栓紧固平形砂轮
3 supporting roller : it has three types : flat supporting roller , groove type supporting roller and slanting preventing roller ; dispersing materials can be reduced if groove type supporting roller is used
3托辊：分平形托辊槽形托辊和防偏辊，采用槽形托辊可减少物倒散落。