4 bolt hole quantity 2 additional holes 180 degrees apart on same bolt hole circle equally spaced between existing holes, 1/4-20 unc-3b thru no.4 /0.209 in. drill, countersunk 90 degrees by 0.281 in. dia., 1 groove on id flanged
4 bolt hole quantity 2 additional holes 180 degrees apart on same bolt hole circle equally spaced between existing holes, 1/4-20 unc-3b thru no.4/0.209 in./drill, countersunk 90 degrees by 0.281 in. dia., 1 groove on id flanged