Zigong City Xinhua Industrial Co,.Ltd

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carbide gundrill tips

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Brand:Xinhua
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Product Description

Before 1960s, the drilling head is made by HSS with heat treatment and grinding. Carbide replaced HSS rapidly. The carbide head is tapered on its length to reduce friction. The taper angle depends on the type of material o be drilled.For high precision drilling, the taper should be reduced to a minimum. Note that when the head is resharpened, the diameter of the drill changes, affecting the hole tolerance. 

- Carbide blanks with single coolant hole

- Carbide blanks with twin coolant hole

- Carbide blanks with kidney coolant hole 


Blanks Dia. [mm]L [mm]Gundrill Dia. [mm]
6.528 / 326.0
7.028 / 326.5
7.530 / 347.0
8.030 / 347.5
8.532 / 368.0
9.032 / 368.5
9.532 / 369.0
10.032 / 369.5
10.532 / 3610.0
11.032 / 3810.5
11.532 / 3811.0
12.035 / 4011.5
12.535 / 4012.0
13.035 / 4012.5
13.535 / 4013.0
14.035 / 4013.5
14.535 / 4014.0
15.038 / 4214.5
15.538 / 4215.0
16.040 / 4515.5
16.540 / 4516.0
17.040 / 4516.5
17.540 / 4517.0
18.045 / 5117.5
18.640 / 4518.0
19.145 / 5118.5
19.645 / 5119.0
20.150 / 5519.5
20.645 / 5020.0
21.150 / 5520.5
21.750 / 5521.0
22.150 / 5821.5
22.745 / 50 / 5822.0
23.150 / 58 / 6122.5
23.750 / 5823.0
24.150 / 5823.5
24.750 / 5824.0
25.155 / 6124.5
25.850 / 55 / 6125.0
26.855 / 6126.0
27.855 / 6127.0
28.855 / 6328.0
29.855 / 6329.0
30.955 / 60 / 6530.0
31.960 / 6531.0
32.960 / 6532.0
33.960 / 6533.0
34.960 / 6534.0
35.960 / 6535.0
36.960 / 6536.0
37.960 / 6537.0
38.960 / 6538.0
39.960 / 6539.0
40.960 / 6540.0
42.96542.0
43.96543.0
45.97045.0

Before 1960s, the drilling head is made by HSS with heat treatment and grinding. Carbide replaced HSS rapidly. The carbide head is tapered on its length to reduce friction. The taper angle depends on the type of material o be drilled.For high precision drilling, the taper should be reduced to a minimum. Note that when the head is resharpened, the diameter of the drill changes, affecting the hole tolerance. 

- Carbide blanks with single coolant hole

- Carbide blanks with twin coolant hole

- Carbide blanks with kidney coolant hole 


Blanks Dia. [mm]L [mm]Gundrill Dia. [mm]
6.528 / 326.0
7.028 / 326.5
7.530 / 347.0
8.030 / 347.5
8.532 / 368.0
9.032 / 368.5
9.532 / 369.0
10.032 / 369.5
10.532 / 3610.0
11.032 / 3810.5
11.532 / 3811.0
12.035 / 4011.5
12.535 / 4012.0
13.035 / 4012.5
13.535 / 4013.0
14.035 / 4013.5
14.535 / 4014.0
15.038 / 4214.5
15.538 / 4215.0
16.040 / 4515.5
16.540 / 4516.0
17.040 / 4516.5
17.540 / 4517.0
18.045 / 5117.5
18.640 / 4518.0
19.145 / 5118.5
19.645 / 5119.0
20.150 / 5519.5
20.645 / 5020.0
21.150 / 5520.5
21.750 / 5521.0
22.150 / 5821.5
22.745 / 50 / 5822.0
23.150 / 58 / 6122.5
23.750 / 5823.0
24.150 / 5823.5
24.750 / 5824.0
25.155 / 6124.5
25.850 / 55 / 6125.0
26.855 / 6126.0
27.855 / 6127.0
28.855 / 6328.0
29.855 / 6329.0
30.955 / 60 / 6530.0
31.960 / 6531.0
32.960 / 6532.0
33.960 / 6533.0
34.960 / 6534.0
35.960 / 6535.0
36.960 / 6536.0
37.960 / 6537.0
38.960 / 6538.0
39.960 / 6539.0
40.960 / 6540.0
42.96542.0
43.96543.0
45.97045.0


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