



| SAE | ||||||||
| ITEM | P/N | B1(SAE 37) | B2(SAE 37) | B3(SAE 37) | Y FLATS | M51 | M52 | M53 |
| 1 | 6606-04-04-04 | 7/16-20 | 7/16-20 | 7/16-20 | 0.438 | 1.000 | 1.000 | 1.000 |
| 2 | 6606-06-06-06 | 9/16-18 | 9/16-18 | 9/16-18 | 0.562 | 1.250 | 1.250 | 1.250 |
| 3 | 6606-08-08-08 | 3/4-16 | 3/4-16 | 3/4-16 | 0.750 | 1.380 | 1.380 | 1.380 |
| 4 | 6606-10-10-10 | 7/8-14 | 7/8-14 | 7/8-14 | 0.937 | 1.620 | 1.620 | 1.620 |
| 5 | 6606-12-12-12 | 1 1/16-12 | 1 1/16-12 | 1 1/16-12 | 1.625 | 1.750 | 1.750 | 1.750 |
| 6 | 6606-16-16-16 | 1 5/16-12 | 1 5/16-12 | 1 5/16-12 | 1.375 | 2.000 | 2.000 | 2.000 |