8555-H Series Metric MM Hollow Hex plug International Fittings Hydraulic steel fittings
| 8555-H08-O | M08X1.5 | 12.3 | 4.3 | 5.0 |
| 8555-HIO-O | M10X 1.5 | 12.3 | 4.3 | 5.0 |
| 8555-HI 2-0 | M12X1.5 | 17.3 | 5.3 | 6.0 |
| 8555-H14-0 | MMX 1.5 | 17.3 | 5.3 | 6.0 |
| 8555-H16-0 | M16X1.5 | 17.3 | 5.3 | 8.0 |
| 8555-H18-0 | M18X1.5 | 17.3 | 5.3 | 8.0 |
| 8555-H20-O | M20X1.5 | 19.3 | 5.3 | 10.0 |
| 8555-H22-0 | M22X1.5 | 19.3 | 5.3 | 10.0 |
| 8555-H24-0 | M24X1.5 | 19.3 | 5.3 | 10.0 |
| 8555-H26-0 | M26X1.5 | 21.3 | 5.3 | 12.0 |
| 8555-H27-0 | M27X2 | 21.3 | 5.3 | 12.0 |
| 8555-H33-0 | M33X2 | 22.8 | 6.8 | 17.0 |
| 8555-H42-0 | M42X2 | 22.8 | 6.8 | 22.0 |
