TiAlN Coated Carbide Stepped Drill, For Bolt Drilling / For Drilling Pilot Holes for Screws, with Chamfering Blade

Specifications

Model Number
TAC-SF-SDR (For bolt hole drilling)

		Step Length ℓ	Large Diameter D1	Groove Length ℓ1	Overall Length L	Shank Diameter d
	Tip Diameter D
Counterbore Type	3.4	10	6.5	21	75	6.5
		15	6.5	25	80	6.5
	4.5	12	8	25	74	8
		22	8	35	84	8
	5.5	17	9.5	29	79	9.5
		28	9.5	40	90	9.5
	6.6	20	11	32	91	11
		33	11	45	104	11
	9	28	14	47	108	14
		42	14	65	122	14
Cutting Type	3.4	8	6	21	73	6
		12	6	25	77	6
	4.3	10	7	26	79	7
	5.1	12	8	30	84	8
		18	8	36	90	8
	6.8	16	10	40	96	10
	8.5	20	12	50	112	12
		30	12	60	122	12
	10.3	36	14	72	136	14

Tip Diameter D	Tolerance (h8)
3.4 ~ 5.5	0 -0.014
6.6 ~ 9	0 -0.018
10.3	0 -0.022

Shank Diameter d	Tolerance (h6)
6	0 -0.008
6.5 ~ 10	0 -0.009
11~ 14	0 -0.011

Model Number
TAC-SC-SDR (For screw tap hole drilling)

Tip Diameter D	Step Length ℓ	Large Diameter D1	Groove Length ℓ1	Overall Length L	Shank Diameter d	Applicable Screw Size
3.4	8	6	21	73	6	M4
	12	6	25	77	6	M4
4.3	10	7	26	79	7	M5
	15	7	31	84	7	M5
5.1	12	8	30	84	8	M6
	18	8	36	90	8	M6
6.8	16	10	40	96	10	M8
	24	10	48	104	10	M8
8.5	20	12	50	112	12	M10
	30	12	60	122	12	M10
10.3	24	14	60	124	14	M12
	36	14	72	136	14	M12

Tip Diameter D	Tolerance (h8)
3.4 ~ 5.1	0 -0.014
6.8 / 8.5	0 -0.018
10.3	0 -0.022

Shank Diameter d	Tolerance (h6)
6	0 -0.008
7 ~ 10	0 -0.009
12 / 14	0 -0.011

For Cutting Conditions, Refer to >>Click here.

More Information

● Boring and counterboring processes when drilling bolt holes can be done in a single step to realize a high-efficiency process. (Counterbore Model)
● When drilling pilot tap holes, a relief hole can be drilled at the same time, which is ideal for drilling pilot holes in thick sheet metal to provide scrap clearance. (Cutting Model)

● Designed for very frequent drilling of pilot holes for M4 – M12 metric coarse thread.
● High-efficiency hole drilling is achieved by reducing the chamfering process.