Nordyne orifice #47. Also known as drill size 0.0785.
Hex head is 7/16", length is 7/16", threads are 1/8-27 NPT.
Picture is for reference only. Hole size will vary on actual item.
Replaces Nordyne part # 660813 & 661047.
Will also replace Rheem part # 62-22173-47 & 622217347 although the length of this orifice is a touch shorter.