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8. Internal Thread Tolerance and Classes of Taps
| DIN EN | 22857 | DIN 802 | Inter | nal thread tolerance r | ange | ||
| Denomination | Characteristic | ||||||
| Class 1 | ISO 1 | 4H | 4H | 5H | - | - | - |
| Class 2 | ISO 2 | 6H | 4G | 5G | 6H | - | - |
| Class 3 | ISO 3 | 6G | - | - | 6G | 7H | 8H |
| - | - | 7G | - | - | - | 7G | 8G |
ISO
8H
7H
6H 5G
5H 4G
4H
6G
4H
6H
7H
PO
ST
ROLL
CARBIDE
Basic pitch diameter
LONG
YAMAWA P CLASS HAND
TAPS
P: ≤0.6 mm P: ≥0.7 mm
| μ m | Tol.: 15 μ | μm | Tol.: 20 μ | EG (STI) | ||||
| 85 | ||||||||
| P5 | 100 | |||||||
| 70 | P5 | SPECIAL | ||||||
| P4 | 80 | THREADS, |
55 P4 60 GAUGES P3 40 P3
P2 40 25 P2
P1 20 THREAD
10 P1 MILLS Basic pitch diameter Basic pitch diameter
DIES
ISO2X (6HX) ISO3X (6GX) CENTER
DRILLS
p = 0.20 mm ~ 0.7 mm x = +15 μ p = 0.75 mm ~ 1.0mm x = +20 μ p = 1.25 mm ~ 2.5 mm x = +25 μ
p = 2.50 mm ~ x = +30 μ Technical