Body
High-tensile Grade 25 cast iron (semi-steel), 180–210 BHN.
MTJ Type
Master Gripping Self-Centring Chucks
MTJ chucks use a two-piece jaw: a base hard jaw fitted in the body, plus top jaws. Each chuck ships with one set of top hard reversible jaws and one set of top soft jaws. Soft jaws can be bored or formed to the workpiece — the usual requirement in production cells at automotive and tooling plants.
Jaws
Low-carbon case-hardening steel, heat treated to 55–60 HRC.
Scroll
Forged wear-resistant alloy steel, 40–45 HRC.
Pinion
Case-hardening alloy steel, 40–45 HRC.
Features
- Base hard jaw with interchangeable top hard and top soft jaws.
- Top jaws mounted with supplied Allen bolts.
- Soft jaws can be modified to the part.
- Body ways, scroll, and pinion hardened and ground.
- Accuracy better than 0.05 mm on 160–315 mm chucks.
- Available in 2, 3, 4, or 6 jaw configurations.
Dimensional data
Swipe sideways to see every column.
| Nominal size d1 | d2 H7 | P.C.D. d3 | Tol. on d3 | d5 | h1 | h2 | D | L | K | L1 | Handle square | Wt MTJ2 | Wt MTJ3 | Wt MTJ4 | Wt MTJ6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 125 | 95 | 108 | ±0.25 | 33 | 60 | 42 | 4 | 55 | M8 | 16 | 9 | — | 4.5 | — | — |
| 160 | 125 | 140 | ±0.30 | 42 | 67 | 48 | 5 | 75 | M10 | 21 | 10 | 8 | 8.5 | 8.25 | 8.4 |
| 200 | 160 | 176 | ±0.35 | 55 | 75 | 62 | 5 | 80 | M10 | 24 | 11 | 13.5 | 14.5 | 14.5 | 15.6 |
| 250 | 200 | 224 | ±0.35 | 76 | 86 | 70 | 6 | 120 | M12 | 30 | 12 | 24 | 25.5 | 25.5 | 26.5 |
| 300 | 250 | 270 | ±0.35 | 90 | 86 | 70 | 6 | 120 | M12 | 30 | 12 | 27 | 29 | 28.5 | 28.5 |
| 315 | 260 | 286 | ±0.40 | 108 | 86 | 72 | 6 | 120 | M12 | 30 | 12 | 38.5 | 38.5 | 40 | 40 |
| 375 | 320 | 349 | ±0.40 | 140 | 95 | 102 | 8 | 140 | M16 | 38 | 16 | 60 | 60 | 60 | 62 |
| 400 | 330 | 362 | ±0.40 | 150 | 105 | 106 | 8 | 160 | M16 | 44 | 16 | 77.5 | 77.5 | 81 | 86 |
| 500 | 433 | 465 | ±0.50 | 203 | 105 | 110 | 8 | 180 | M16 | 50 | 16 | 110 | 110 | 114 | 122 |
| 610 | 538 | 567 | ±0.50 | 260 | 130 | 116 | 10 | 200 | M16 | 55 | 19 | 189 | 189 | 195 | 212 |
Taken from the series datasheet. Confirm spindle nose, bore, and jaws on the quote. The PDF drawing governs.