Step Drills
Material: H.S.S
For Drilling and Counterboring Cap Screw Clearance Holes
SCREW SIZE |
d1 Minor Diameter |
d2 Major Diameter |
L1 Step length |
Jobber length |
taper lenth |
l2 Flute Length |
L overall Length |
L 2 Flute Length |
L overall Length |
No.6 |
0.150 |
1/4 |
1/2 |
2-3/4 |
4" |
3-3/4 |
6-1/8 |
No.8 |
0.178 |
"L" |
1/2 |
2-15/16 |
4-1/4 |
4 |
6-3/8 |
No.10 |
0.204 |
"Q" |
5/8 |
3-7/16 |
4-3/4 |
4-1/8 |
6-1/2 |
1/4 |
9/32 |
13/32 |
11/16 |
3-7/8 |
5-1/4 |
4-3/8 |
7 |
5/16 |
11/32 |
1/2 |
3/4 |
4-1/2 |
6" |
4-3/4 |
7-3/4 |
3/8 |
13/32 |
19/32 |
7/8 |
5-3/16 |
7-1/8 |
4-7/8 |
8-3/4 |
1/2 |
17/32 |
25/32 |
1" |
3-1/4 |
5-1/8 |
6" |
9-7/8 |
For Drilling 45oChamfered Holes To-Be-Tapped (to PRoduce Approx. 70% Thread)
SCREW SIZE |
d1 Minor Diameter |
d2 Major Diameter |
L1 Step length |
Jobber length |
taper lenth |
l2 Flute Length |
L overall Length |
L 2 Flute Length |
L overall Length |
5-40 |
0.101 |
9/64 |
1/2 |
1-3/4 |
2-7/8 |
3" |
5-3/8 |
6-32 |
0.109 |
5/32 |
1/2 |
2" |
3-1/8 |
3" |
5-3/8 |
8-32 |
0.136 |
3/16 |
1/2 |
2-5/16 |
3-1/2 |
3-3/8 |
5-3/4 |
8-36 |
0.136 |
3/16 |
1/2 |
2-5/16 |
3-1/2 |
3-3/8 |
5-3/4 |
10-24 |
0.152 |
1/4 |
5/8 |
2-3/4 |
4" |
3-3/4 |
6-1/8 |
10-32 |
0.161 |
1/4 |
5/8 |
2-3/4 |
4" |
3-3/4 |
6-1/8 |
1/4-20 |
0.204 |
21/64 |
13/16 |
3-5/16 |
4-5/8 |
4-1/8 |
6-1/2 |
1/4-28 |
0.218 |
21/64 |
13/16 |
3-5/16 |
4-5/8 |
4-1/8 |
6-1/2 |
5/16-18 |
0.261 |
13/32 |
15/16 |
3-7/8 |
5-1/4 |
4-3/8 |
7" |
5/16-24 |
0.272 |
13/32 |
15/16 |
3-7/8 |
5-1/4 |
4-3/8 |
7" |
3/8-16 |
0.316 |
31/64 |
1" |
4-3/8 |
5-7/8 |
4-3/4 |
7-3/4 |
3/8-24 |
0.339 |
31/64 |
1" |
4-3/8 |
5-7/8 |
4-3/4 |
7-3/4 |
7/16-14 |
0.375 |
17/32 |
1-1/16 |
4-13/16 |
6-5/8 |
4-3/4 |
8" |
7/16-20 |
0.390 |
17/32 |
1-1/16 |
4-13/16 |
6-5/8 |
4-3/4 |
8" |
1/2-13 |
0.437 |
5/8 |
1-1/16 |
5-3/16 |
7-1/8 |
4-7/8 |
8-3/4 |
1/2-20 |
0.452 |
5/8 |
1-1/16 |
5-3/16 |
7-1/8 |
4-7/8 |
8-3/4 |
For Drilling and Countersinking 82 oFlat head Machine Screws
SCREW SIZE |
d1 Minor Diameter |
d2 Major Diameter |
L1 Step length |
L2 flute length |
L overall length |
No.6 |
0.142 |
9/32 |
1/2 |
2-15/16 |
4-1/4 |
No.8 |
0.169 |
"Q" |
1/2 |
2-7/16 |
4-3/4 |
No.10 |
0.196 |
"W" |
5/8 |
3-3/4 |
5-1/8 |
1/4 |
0.257 |
1/2 |
11/16 |
4-13/16 |
6-5/8 |
5/16 |
0.320 |
5/8 |
3/4 |
5-3/16 |
7-1/8 |
3/8 |
0.383 |
3/4 |
7/8 |
5-5/8 |
7-5/8 |
1/2 |
0.510 |
7/8 |
1" |
3-1/2 |
5-1/2 |
Note: All of sizes will be produced as special orders.
Add:774 Songbin Road, Shanghai, 200940
Fax:0086-21-56719140
Tel :0086-21-56719141, 56719142, 56666357
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