171337 Simplicity 1/2" Shoulder BOLT 5/16"-18 Threads

BOLT, Shoulder BOLT. Threads 5/16"-18 x .80" Long, Shoulder .49"OD x .32" Long; Flange Washer .75"OD Guessing Grade 2 no mark on head. OEM Lawn-Boy Part Number 603440. Sold Individually.

BOLT, Shoulder Bolt 1/4"-20 Threads Shoulder .37"OD x .40" Long 1.25" long overall 2027494, 72027494 supersede 2166051sm

BOLT Shoulder Bolt, Low Profile Head. 3/8"-16 x .62" Long  Shoulder .62"OD x 1.78" Long Head .12" Thick x 1.12" Wide.

BOLT, Shoulder Bolt. Threaded 3/8" NF x .68" Long .43"OD SHOULDER x .50" L x Overall Length 1.35"

FITTING Tube OD 5/16" x 1/2"-20 Threads. Ferrule is 70910857 Sold Individually.