P-NPT Size (in.) | Px-NPT Number | Basic Ordering Number | L | F | B | Bx | E Minimum Opening | | 1/8 | 1/16 | RB-NS2-NS1 | 26.2 | 11.1 | 9.7 | 9.9 | 4.8 | | 1/4 | 1/8 | RB-NS4-NS2 | 26.9 | 14.3 | 14.2 | 10.4 | 7.7 | | 3/8 | 1/4 | RB-NS6-NS4 | 30.2 | 19.1 | 14.2 | 15.0 | 9.7 | | 1/2 | 3/8 | RB-NS8-NS6 | 35.8 | 22.2 | 19.1 | 15.0 | 11.9 | | 3/4 | 1/2 | RB-NS12-NS8 | 41.4 | 27.0 | 19.1 | 19.8 | 15.7 | | 1 | 3/4 | RB-NS16-NS12 | 47.0 | 34.9 | 23.9 | 20.6 | 22.4 | |  |