Bar Nut / Poulan 530-015251Pack Size:1Poulan 530-015251, Poulan 530-015445NHC 203-4843, Rotary 3261, Stens 635-437Poulan 1220, 1420, 1425, 1625, 2100, 236, 2400, EL-14 and EL-16Thread: 5/16 "-18, Package of 2, Priced per pack, sold per pack