| BK7 |  |
 Penta prism can deflect an incident beam without inverting or reversing to 90°. It is commonly used in Plumb Level, Surveying, Alignment, Range finding and Optical Tooling. |
| Size(mm) | Part No. | |
| 30 sec. deviation | 10 sec. deviation | |
| 5x5 | PTP0105 | PTP1105 |
| 10x10 | PTP0110 | PTP1110 |
| 15x15 | PTP0115 | PTP1115 |
| Material: | BK7 Grade A optical glass |
| Dimension Tolerance: | +0,-0.2mm |
| Bevel: | 0.2 mm to 0.5 mm x 45 ° |
| Clear Aperture: | >80% |
| Surface Quality: | 60-40 scratch and dig |
| Flatness: | l/4 at 632.8 nm |
| Reflectivity: | R > 95% per face |
| 90 ° deviation tolerance: | As Table |