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Drills
(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.



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