First thread size is OD. Second thread size is ID. Calibers smaller than .270 use the 10-32 ID, larger use 1/4-28, but you will have to measure OD as there have been some changes in the last 50 years.
Item # | Title | Price |
---|---|---|
RH01 | 1/2 x 10-32 Rod Head | $7.89 |
RH02 | 1/2 x 1/4-28 Rod Head | $7.89 |
RH03 | 9/16 x 10-32 Rod Head | $7.89 |
RH04 | 9/16 x 1/4-28 Rod Head | $7.89 |
RH05 | 5/8-18 x 1/4-28 Rod Head | $9.82 |
RH06 | 3/4-16 x 1/4-28 Rod Head | $12.77 |
RH07 | 7/8 - 14 x 7/16 - 20 Rod Head | $17.02 |
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