ROUND JAWS - 3.0 mm x 60° Serrations
FOR USE ON: MMK Matsumoto, Howa & Other Chucks
- 3.0mm x 60° serrations
- Round Jaws allow for complete gripping of workpiece
- Oversized jaws available
- Ideal for thin-walled or irregular shaped workpieces.
- Can be machined to fit workpiece
- Max. length of serrations: 5.75"
- All jaws have 2 holes
- Special "J" dimensions available
- Available in Aluminum & Cast Iron
| Critical Dimensions | ALUMINUM | CAST IRON | STEEL | ||||||||
| Group No |
Chuck Size |
Groove Width G |
Screw Size E |
Hole Space D |
Hole to Front J |
Pie Dia B |
Height Inch A |
Industry Ref # |
Part Number |
Part Number |
Part Number |
| K3-12-20 | 6 | 0.472 (12mm) | 10mm | 0.787 (20mm) | 1.375 | 6 | 2.00 | - | RH3-6200A | RH3-6200CI | RH3-6200S |
| 4.00 | - | RH3-6400A | - | - | |||||||
| K3-14-25 | 8 | 0.551 (14mm) | 12mm | 0.985 (25mm) | 2.250 | 8 | 2.00 | HOW8P | RH3-8200A | RH3-8200CI | RH3-8200S |
| 4.00 | HOW8P1 | RH3-8400A | RH3-8400CI | - | |||||||
| 2.00 | - | 10-RH3-8200A | - | - | |||||||
| 10 | 2.00 | - | 12-RH3-8200A* | - | - | ||||||
| K3-15-30 | 10 | 0.591 (15mm) | 12mm | 1.181 (30mm) | 2.250 | 12 | 2.00 | - | RH3-10204A | RH3-10204CI | - |
| 2.375 | 10 | 4.00 | - | RH3-10404A | - | - | |||||
| K3-16-30 | 10 | 0.630 (16mm) | 12mm | 1.181 (30mm) | 2.375 | 10 | 2.00 | - | RH3-10200A | RH3-10200CI | RH3-10200S |
| 3.000 | 10 | 2.00 | HOW10P | RH3-10200A4 | - | - | |||||
| 2.375 | 10 | 4.00 | - | RH3-10400A | - | - | |||||
| 3.000 | 10 | 4.00 | HOW10P1 | RH3-10400A4 | - | - | |||||
| 2.375 | 10 | 5.00 | - | RH3-10500A* | - | - | |||||
| 12 | 2.50 | - | 12-RH3-10250A* | - | - | ||||||
| 4.00 | - | 12-RH3-10400A* | - | - | |||||||
| 15 | 2.50 | - | 15-RH3-10250A* | - | - | ||||||
| 4.00 | - | 15-RH3-10400A* | - | - | |||||||
| 21 | 2.50 | - | 21-RH3-10250A* | - | - | ||||||
| K3-18-30 | 12 | 0.709 (18mm) | 14mm | 1.181 (30mm) | 3.625 | 12 | 2.00 | HOW12P | RH3-12200A | RH3-12200CI | - |
| 2.50 | - | RH3-12250A | - | - | |||||||
| 3.00 | - | RH3-12300A | - | - | |||||||
| 4.00 | HOW12P1 | RH3-12400A | - | - | |||||||
| 5.00 | - | RH3-12500A | - | - | |||||||
| 15 | 2.50 | - | 15-RH3-12250A | - | - | ||||||
| 3.00 | HOW15-12P | 15-RH3-12300A | - | - | |||||||
| 18 | 3.00 | HOW18-12P | 18-RH3-12300A | - | - | ||||||
| K3-21-40 | 15 | 0.827 (21mm) 0.826 |
16mm | 1.575 (40mm) | 3.187 | 15 | 2.50 | - | RH3-15258A | RH3-15258CI | - |
| 4.125 | 15 | 3.00 | HOW7MA15P | RH3-15308A4 | - | - | |||||
| 3.187 | 15 | 4.00 | - | RH3-15408A | - | - | |||||
| 4.125 | 15 | 4.00 | HOW7MA15P1 | RH3-15408A4 | - | - | |||||
| K3-22-50 | 15-18 | 0.866 (22mm) (some mfg's refer to this as 0.868) |
20mm | 1.969 (50mm) | 3.750 | 15 | 2.50 | - | RM3-15250A | RM3-15250CI | - |
| MMK HA-18-162, HA11-15, HA11-18, HA8-15 |
4.125 | 15 | 3.00 | MTT15P | RM3-15300A4 | - | - | ||||
| 3.750 | 15 | 4.00 | - | RM3-15400A | - | - | |||||
| 4.125 | 15 | 4.00 | MTT15P1 | RM3-15400A4 | - | - | |||||
| 3.750 | 15 | 6.00 | - | RM3-15600A* | - | - | |||||
| 4.125 | 15 | 6.00 | MTT15P6 | RM3-15600A4 | - | - | |||||
| 3.750 | 18 | 2.50 | - | 18-RM3-15250A | - | - | |||||
| 4.125 | 18 | 3.00 | MTT18-15P | 18-RM3-15300A4 | - | - | |||||
| 3.750 | 18 | 4.00 | - | 18-RM3-15400A | - | - | |||||
| 4.125 | 18 | 4.00 | MTT18-15P1 | 18-RM3-15400A4 | - | - | |||||
| 3.750 | 21 | 2.50 | - | 21-RM3-15250A | - | - | |||||
| 4.125 | 21 | 3.00 | MTT21-15P | 21-RM3-15300A4 | - | - | |||||
| 3.750 | 21 | 4.00 | - | 21-RM3-15400A | - | - | |||||
| 4.125 | 21 | 4.00 | MTT21-15P1 | 21-RM3-15400A4 | - | - | |||||
| 3.750 | 24 | 2.50 | - | 24-RM3-15250A | - | - | |||||
| 3.750 | 24 | 4.00 | - | 24-RM3-15400A* | - | - | |||||
| K3-25-60 | 18-24 | 0.984 (25mm) (some mfg's refer to this as .985) |
20mm | 2.360 (60mm) | 4.000 | 15 | 4.00 | - | 15-RK3-21400A | - | - |
| KITAGAWA B-21, B-24 SAMCHULLY HAH/HCH 21 HAH/HCH 24 |
18 | 2.50 | - | RK3-18250A | - | - | |||||
| 4.00 | - | RK3-18400A | - | - | |||||||
| 2.362 (60mm) | 4.750 | 18 | 3.00 | KTT18-21P | 18-RK3-21300A4 | - | - | ||||
| 4.00 | KTT18-21P1 | 18-RK3-21400A4 | - | - | |||||||
| 2.360 (60mm) | 4.000 | 21 | 2.50 | - | RK3-21250A | - | - | ||||
| 4.00 | - | RK3-21400A | - | - | |||||||
| 2.362 (60mm) | 4.750 | 21 | 3.00 | KTT21P | RK3-21300A4 | - | - | ||||
| 4.00 | KTT21P1 | RK3-21400A4 | - | - | |||||||
| 2.360 (60mm) | 4.000 | 24 | 2.50 | - | 24-RK3-21250A | - | - | ||||
| 4.00 | - | 24-RK3-21400A | - | - | |||||||
| 6.000 | 24 | 2.50 | - | 24-RK3-21250A6 | - | - | |||||
| 2.362 (60mm) | 4.750 | 24 | 3.00 | KTT24-21P | 24-RK3-21300A4 | - | - | ||||
| 4.00 | KTT24-21P1 | 24-RK3-21400A4 | - | - | |||||||
| 7.500 | 24 | 3.00 | KTT24P | RK3-24300A | - | - | |||||
| 4.00 | KTT24P1 | RK3-24400A7 | - | - | |||||||
| 4.750 | 28 | 3.00 | KTT28-21P | 28-RK3-21300A | - | - | |||||
| 4.00 | KTT28-21P1 | 28-RK3-21400A | - | - | |||||||
| 7.500 | 28 | 3.00 | KTT28-24P | 28-RK3-24300A | - | - | |||||
| 4.00 | KTT28-24P1 | 28-RK3-24400A | - | - | |||||||
| K3-25-80 | 24 | 0.984 (25mm) | 20mm | 3.150 (80mm) | 3.850 | 24 | 2.50 | - | RK3-24250A | - | - |
| 4.00 | - | RK3-24400A | - | - | |||||||
| K3-26-42 | 15 | 1.023 (26mm) | 20mm | 1.656 (42mm) | 3.437 | 15 | 2.50 | - | RH3-15254A | RH3-15254CI | - |
| 4.00 | - | RH3-15404A | - | - | |||||||
| 1.025 | 20mm | 1.653 | 4.313 | 15 | 3.00 | HOW27M15P | RH3-15304A4 | - | - | ||
| K3-26-50 | 18-20 | 1.023 (26mm) | 20mm | 1.969 (50mm) | 3.437 | 15 | 2.50 | - | RH3-15250A | RH3-15250CI | - |
| 4.00 | HOW15P1 | RH3-15400A | - | - | |||||||
| 24 | 2.50 | - | 24-RH3-15250A* | - | - | ||||||
Round Jaw Material: ALUMINUM-6061-T6 Bar Stock, CAST IRON-Gray, STEEL-1018. 18" & Larger- Aluminum Casting T6
* denotes non-stock item. Please allow 1 week manufacturing time.