SPI Micro Surface Finish Comparator Plates
Material: Solid Electroformed Nickel
Features:
- Molded into metal frames
- Lightweight (2.5 oz) in fitted wallets
- Fits right into pocket - 2-1/16" L x 5" W overall size
- Individual specimens: 5/8" L x 1" W
- Used by Q,C. inspectors, line supervisors, machinists, draftsmen, designers, etc.
- Wallets contain durable instruction cards allowing user to assess roughness by sight and touch
- Plates are marked in AA (micro inches), Ra (μm) and Rz as well as "N" numbers
- All plates conform to SAE and MIL Specs. Manufactured to ANSI-B-46.1-1978. Military Standard 45662.
Specifications:
| Item # | Machining Method | No. of Specimens | Ra μm | Measuring Range Aaμ" | N# |
| 14-440-2 | Surface Grinding | 8 | 0.025 - 3.2 | 1, 2, 4, 8, 16, 32, 63, 125 | 1-8 |
| 14-441-0 | Cylindrical Grinding | 8 | 0.025 - 3.2 | 1, 2, 4, 8, 16, 32, 63, 125 | 1-8 |
| 14-442-8 | Face Turning (flat) | 8 | 0.4 - 50 | 16, 32, 63, 125, 250, 500, 1000, 2000 | 5-12 |
| 14-443-6 | Cylindrical Turning | 8 | 0.4 - 50 | 16, 32, 63, 125, 250, 500, 1000, 2000 | 5-12 |
| 14-444-4 | End Milling | 8 | 0.4 - 50 | 16, 32, 63, 125, 250, 500, 1000, 2000 | 5-12 |
| 14-445-1 | Reaming & Drilling | 8 | 0.4 - 12.5 | Reaming 16,32,63,125 Drilling 63,125,250,500 | 5-10 |
| 14-446-9 | Horizontal Milling | 8 | 0.4 - 50 | 16, 32, 63, 125, 250, 500, 1000, 2000 | 5-12 |
| 14-447-7 | Shaping or Planing | 8 | 0.8 - 100 | 32, 63, 125, 250, 500, 1000, 2000, 4000 | 6-13 |
| 14-448-5 | Belt Sanding | 6 | 0.10 - 3.2 | 4, 8, 16, 32, 63, 125 | 3-8 |
| 14-449-3 | Vertical Grinding | 6 | 0.2 - 6.3 | 8, 13, 62, 63, 125, 250 | 4-9 |
| 14-450-1 | Honing | 6 | 0.05 - 1.6 | 2, 4, 8, 16, 32, 63 | 2-7 |
| 14-451-9 | Polishing | 5 | 0.0125 - 0.20 | 0.5, 1, 2, 4, 8 | 0-4 |
