The Robins SGH 12 HD is a heavy-duty seat and guide machine built for machining everything from small motorcycle heads to the largest multi-valve diesel heads in one setup.
A full-rotation roll fixture allows complete access for seat cutting, drilling, tapping, injector tube work, and thread repair.
The SGH 12 HD provides the repeatability, rigidity, and precision required for performance racing, diesel rebuilders, and heavy-duty engine shops.
The machine uses a fixed-pilot system paired with Robins’ precision Guide Honing kit, ensuring perfect guide geometry before seat cutting for maximum concentricity. Designed for demanding environments, the SGH 12 HD maintains stable accuracy and consistent valve-seat quality across all cylinder head types.
| Max Cylinder Head Size (in roll fixture) | 47 x 15 x 10 in (1193 x 381 x 254 mm) |
| Spindle Speed | 30 – 500 RPM |
| Spindle Stroke | 8.40 in (213 mm) |
| Spindle Tilt | ± 15 degrees |
| Electrical Supply | 220 V / 50–60 Hz / 1 Phase |
| Constant Varying Speed | Yes |
| Micro Fine Feed | Yes |
| Spring Free Tooling | Yes |
| Threading/Tapping Feature | Yes |
| Net Weight (Approx.) | 3274 lbs (1485 kg) |
| Shipping Weight (Approx.) | 3638 lbs (1650 kg) |
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| FEATURES |
SGH 12 HD
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| Max Cylinder Head Size (in roll fixture) | 47 x 15 x 10 in (1193 x 381 x 254 mm) | 10 x 10 x 6 in (254 x 254 x 152 mm) |
| Spindle Speed | 30 – 500 RPM | 70 – 570 RPM |
| Spindle Stroke | 8.40 in (213 mm) | 5.75 in (146 mm) |
| Spindle Tilt | ± 15 degrees | ± 10 degrees |
| Electrical Supply | 220 V / 50–60 Hz / 1 Phase | 220 V / 50–60 Hz / 1 Phase |
| Constant Varying Speed | Yes | Yes |
| Micro Fine Feed | Yes | No |
| Spring Free Tooling | Yes | Yes |
| Threading/Tapping Feature | Yes | Yes |
| Net Weight (Approx.) | 3274 lbs (1485 kg) | 882 lbs (400 kg) |
| Shipping Weight (Approx.) | 3638 lbs (1650 kg) | 1103 lbs (500 kg) |
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