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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
To order any of these items enter the Part Number into the search bar above. (This will take you to the product page where you can add the item to the shopping cart)
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.