Solid Counterbores and Step Drills
Inch Size 3 Flute Capscrew Counterbores |
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High speed steel, for socket cap screws.
3 Flute cap screw counterbores have larger pilots than 2 Flute solid counterbores.
These counterbore screws have straight shanks.
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Quantity
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Price
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Model
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Description
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Screw Size |
Pilot Diam. |
Cutter Diam. |
Shank Diam. |
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$9.10 | CBCS-5
| #5 Capscrew Counterbore, 3 Flute, HSS, 1182-0001 | #5 |
.141" |
.221" |
3/16" |
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$9.10 | CBCS-6
| #6 Capscrew Counterbore, 3 Flute, HSS, 1182-0002 | #6 |
0.15" |
0.242 |
7/32" |
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$9.10 | CBCS-8
| #8 Capscrew Counterbore, 3 Flute, HSS, 1182-0005 | #8 |
11/64" |
19/64 |
1/4" |
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$10.30 | CBCS-10
| #10 Capscrew Counterbore, 3 Flute, HSS, 1182-0010 | #10 |
13/64" |
21/64 |
5/16" |
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$12.05 | CBCS-1/4
| 1/4" Capscrew Counterbore, 3 Flute, HSS, 1182-0015 | 1/4" |
9/32" |
13/32 |
3/8" |
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$14.15 | CBCS-5/16
| 5/16" Capscrew Counterbore, 3 Flute, HSS, 1182-0020 | 5/16" |
11/32" |
1/2 |
7/16" |
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$15.60 | CBCS-3/8
| 3/8" Capscrew Counterbore, 3 Flute, HSS, 1182-0025 | 3/8" |
13/32" |
19/32 |
1/2" |
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$18.65 | CBCS-7/16
| 7/16" Capscrew Counterbore, 3 Flute, HSS, 1182-0030 | 7/16" |
15/32" |
11/16 |
1/2" |
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$22.40 | CBCS-1/2
| 1/2" Capscrew Counterbore, 3 Flute, HSS, 1182-0032 | 1/2" |
17/32" |
25/32 |
1/2" |
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$18.40 | CBCS-1/2A
| 1/2" Capscrew Counterbore, 3 Flute, HSS (3/4" Shank), 1182-0040 | 1/2" |
17/32" |
25/32 |
3/4" |
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$29.90 | CBCS-5/8
| 5/8" Capscrew Counterbore, 3 Flute, HSS, 1182-0050 | 5/8" |
21/32" |
31/32 |
3/4" |
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$41.60 | CBCS-3/4
| 3/4" Capscrew Counterbore, 3 Flute, HSS, 1182-0060 | 3/4" |
13/16" |
1 3/16 |
1" |
Metric Capscrew Counterbores |
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Metric Capscrew Counterbores
For counterboring holes for METRIC Socket Cap screws.
High Speed Steel.
Most sizes have 3 flutes, but some may have 4 flutes.
Please Note the "Shank" descriptions:
In addition to Straight Shank counterbores, we also have additional 2MT TAPER SHANK models for 14, 16, and 20mm sizes at the bottom of the listing.
Use Straight Shank models for chucking in a drill chuck, collet, etc.
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Quantity
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Price
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Model
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Description
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Screw Size |
Pilot Diam. |
Cutter Diam. |
Shank Diam. |
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$12.20 | CBCS-M3
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 3mm, 1182-0660 | 3mm |
3.4mm |
6mm |
.2185" |
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$14.50 | CBCS-M4
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 4mm, 1182-0665 | 4mm |
4.5mm |
8mm |
.3122" |
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$15.50 | CBCS-M5
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 5mm, 1182-0670 | 5mm |
5.5mm |
10mm |
.3747" |
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$19.80 | CBCS-M6
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 6mm, 1182-0675 | 6mm |
6.6mm |
11mm |
.4371" |
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$18.80 | CBCS-M8
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 8mm, 1182-0680 | 8mm |
9mm |
15mm |
.4996" |
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$18.80 | CBCS-M10
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 10mm, 1182-0685 | 10mm |
11mm |
18mm |
.4996" |
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$20.20 | CBCS-M12
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 12mm, 1182-0690 | 12mm |
14mm |
20mm |
.4996" |
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$25.50 | CBCS-M14
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 14mm, 1182-0695 | 14mm |
15mm |
24mm |
3/4" |
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$30.40 | CBCS-M16
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 16mm, SS, 1182-0700 | 16mm |
17mm |
26mm |
1" |
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$54.00 | CBCS-M20
| Counterbore, Capscrew-Metric, Straight Shank, HSS, 20mm, 1182-0705 | 20mm |
21mm |
33mm |
1" |
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$27.90 | CBCS-M14T
| Counterbore, Capscrew-Metric, Taper Shank 2MT, HSS, 14mm, 1182-0745 | 14mm |
15mm |
24mm |
2 Morse Taper |
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$30.40 | CBCS-M16T
| Counterbore, Capscrew-Metric, Taper Shank 2MT, HSS, 16mm, 1182-0750 | 16mm |
17mm |
26mm |
2 Morse Taper |
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$56.00 | CBCS-M20T
| Counterbore, Capscrew-Metric, Taper Shank 2MT, HSS, 20mm, 1182-0755 | 20mm |
21mm |
33mm |
2 Morse Taper |
2 Flute Solid Counterbores |
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2 Flute Solid Counterbores.
High Speed Steel.
Counterbore Bits for Fillister-head machine screws.
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Quantity
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Price
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Model
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Description
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Pilot/Screw Size |
Cutting Size |
Overall Length |
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$8.25 | CB2-3
| #3 Solid Counterbore, 2 Flute, HSS, 1182-0515 | .098/#3 |
.176" |
2 1/2" |
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$7.15 | CB2-4
| #4 Solid Counterbore, 2 Flute, HSS, 1182-0520 | .111/#4 |
0.198 |
2 5/8 |
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$7.75 | CB2-5
| #5 Solid Counterbore, 2 Flute, HSS, 1182-0525 | .124/#5 |
0.22 |
2 5/8 |
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$8.00 | CB2-6
| #6 Solid Counterbore, 2 Flute, HSS, 1182-0530 | .137/#6 |
0.241 |
2 5/8 |
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$8.50 | CB2-8
| #8 Solid Counterbore, 2 Flute, HSS, 1182-0535 | .163/#8 |
0.285 |
2 3/4 |
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$9.15 | CB2-10
| #10 Solid Counterbore, 2 Flute, HSS, 1182-0540 | .189/#10 |
0.328 |
2 7/8 |
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$10.20 | CB2-12
| #12 Solid Counterbore, 2 Flute, HSS, 1182-0545 | .215/#12 |
0.372 |
3 |
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$14.70 | CB2-1/4
| 1/4" Solid Counterbore, 2 Flute, HSS, 1182-0550 | 1/4" |
13/32 |
3 5/8 |
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$15.40 | CB2-5/16
| 5/16" Solid Counterbore, 2 Flute, HSS, with 15/32 CUT, 1182-0555 | 5/16" |
15/32 |
4 |
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$13.40 | CB2-5/16-A
| 5/16" Solid Counterbore, 2 Flute, HSS, with 31/64 CUT | 5/16" |
31/64 |
4 |
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$17.60 | CB2-3/8
| 3/8" Solid Counterbore, 2 Flute, HSS, 1182-0560 | 3/8" |
19/32 |
4 3/8 |
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$19.90 | CB2-7/16
| 7/16" Solid Counterbore, 2 Flute, HSS, 1182-0565 | 7/16" |
21/32 |
4 3/4 |
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$21.60 | CB2-1/2
| 1/2" Solid Counterbore, 2 Flute, HSS, 1182-0570 | 1/2" |
25/32 |
5 1/8 |
Style 371 Step Drills for Cap Screw Clearance |
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Style 371. For Drilling and Counterboring Cap Screw Clearance Holes.
High Speed Steel.
Jobbers length (except 1/2 and 5/8, which are shorter).
Easily resharpened. Does 2 jobs in a single pass.
Made in USA.
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Quantity
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Price
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Model
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Description
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Minor Diameter |
Major Diameter |
Step Length |
Flute Length |
Overall Length |
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$12.80 | DRST371-4
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: #4, 1009-0003 | 0.136 |
7/32 |
3/8 |
2 1/2 |
3 3/4 |
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$13.50 | DRST371-5
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: #5, 1009-0004 | 0.141 |
No. 1 (.228") |
3/8 |
2 5/8 |
3 7/8 |
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$14.30 | DRST371-6
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: #6, 1009-0005 | 0.150 |
1/4 |
1/2 |
2 3/4 |
4 |
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$16.35 | DRST371-8
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: #8, 1009-0010 | 0.178 |
L (.290") |
1/2 |
2 15/16 |
4 1/4 |
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$17.90 | DRST371-10
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: #10, 1009-0015 | 0.204 |
Q (.332") |
5/8 |
3 7/16 |
4 3/4 |
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$20.65 | DRST371-1/4
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 1/4", 1009-0020 | 9/32 |
13/32 |
11/16 |
3 7/8 |
5 1/4 |
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$27.40 | DRST371-5/16
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 5/16", 1009-0025 | 11/32 |
1/2 |
3/4 |
4 1/2 |
6 |
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$43.80 | DRST371-3/8
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 3/8", 1009-0030 | 13/32 |
19/32 |
7/8 |
5 3/16 |
7 1/8 |
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$52.30 | DRST371-7/16
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 7/16", 1009-0031 | 15/32 |
11/16 |
1 |
5 5/8 |
7 5/8 |
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$72.10 | DRST371-1/2
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 1/2", 1009-0032 | 17/32 |
25/32 |
1 |
3 1/4 |
5 1/8 |
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$96.30 | DRST371-5/8
| Step Drill 371, HSS, for Counterbored Capscrew Clearance: 5/8", 1009-0033 | 21/32 |
31/32 |
1 |
3 7/8 |
5 7/8 |
Style 372 Step Drills for Flat Head Screws |
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Style 372. For Drilling and Countersinking 82° Flat Head Screw Clearance Holes.
High Speed Steel. Jobbers length (except 7/16 and 1/2, which are shorter).
Easily resharpened. Does 2 jobs in a single pass.
Made in USA
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Quantity
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Price
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Model
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Description
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Minor Diameter |
Major Diameter |
Step Length |
Flute Length |
Overall Length |
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$13.80 | DRST372-4
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: #4, 1009-0113 | 0.116 |
15/64 |
3/8 |
2-5/8 |
3 7/8 |
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$14.45 | DRST372-5
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: #5, 1009-0114 | 0.128 |
F |
3/8 |
2-7/8 |
4 1/8 |
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$15.15 | DRST372-6
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: #6, 1009-0115 | 0.142 |
9/32 |
1/2 |
2-15/16 |
4 1/4 |
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$17.90 | DRST372-8
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: #8, 1009-0120 | 0.169 |
Q |
1/2 |
3-7/16 |
4 3/4 |
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$19.50 | DRST372-10
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: #10, 1009-0125 | 0.196 |
W |
5/8 |
3-3/4 |
5 1/8 |
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$24.14 | DRST372-1/4
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: 1/4", 1009-0130 | 0.257 |
1/2 |
11/16 |
4-13/16 |
6 5/8 |
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$37.85 | DRST372-5/16
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: 5/16", 1009-0135 | 0.320 |
5/8 |
3/4 |
5-3/16 |
7 1/8 |
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$52.50 | DRST372-3/8
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: 3/8", 1009-0140 | 0.383 |
3/4 |
7/8 |
5-5/8 |
7 5/8 |
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$68.35 | DRST372-7/16
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: 7/16", 1009-0144 | 0.446 |
13/16 |
1 |
3-3/8 |
5 1/4* |
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$75.40 | DRST372-1/2
| Step Drill 372, HSS, for Flathead MachScrew Clearance w/ 82 deg Chamfer: 1/2", 1009-0145 | 0.510 |
7/8 |
1 |
3-1/2 |
5 1/2* |
Style 370 Step Drills for Holes-To-Be-Tapped |
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Style 370. For Drilling 45 degree Chamfered Holes To-Be-Tapped.
High Speed Steel. Jobbers length.
Easily resharpened. Does 2 jobs in a single pass.
Made in USA
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Quantity
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Price
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Model
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Description
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Minor Diameter |
Major Diameter |
Step Length |
Flute Length |
Overall Length |
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$12.10 | DRST370-4-40
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #4-40, 1009-0034 | 0.089 |
.1285" |
3/8 |
1 5/8 |
2 3/4 |
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$12.75 | DRST370-5-40
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #5-40, 1009-0035 | 0.101 |
9/64 |
1/2 |
1 3/4 |
2 7/8 |
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$12.90 | DRST370-6-32
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #6-32, 1009-0040 | 0.109 |
5/32 |
1/2 |
2 |
3 1/8 |
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$13.25 | DRST370-8-32
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #8-32, 1009-0045 | 0.136 |
3/16 |
1/2 |
2 5/16 |
3 1/2 |
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$13.45 | DRST370-8-36
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #8-36, 1009-0050 | 0.136 |
3/16 |
1/2 |
2 5/16 |
3 1/2 |
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$14.10 | DRST370-10-24
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #10-24, 1009-0055 | 0.152 |
1/4 |
5/8 |
2 3/4 |
4 |
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$14.10 | DRST370-10-32
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #10-32, 1009-0060 | 0.161 |
1/4 |
5/8 |
2 3/4 |
4 |
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$16.35 | DRST370-12-24
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: #12-24, 1009-0064 | 0.179 |
9/32 |
11/16 |
2 15/16 |
4 1/4 |
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$17.35 | DRST370-1/4-20
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 1/4-20, 1009-0065 | 0.204 |
21/64" |
13/16 |
3 5/16 |
4 5/8 |
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$17.65 | DRST370-1/4-28
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 1/4-28, 1009-0070 | 0.218 |
21/64" |
13/16 |
3 5/16 |
4 5/8 |
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$19.80 | DRST370-5/16-18
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 5/16-18, 1009-0075 | 0.261 |
13/32 |
15/16 |
3 7/8 |
5 1/4 |
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$20.05 | DRST370-5/16-24
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 5/16-24, 1009-0080 | 0.272 |
13/32 |
15/16 |
3 7/8 |
5 1/4 |
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$26.15 | DRST370-3/8-16
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 3/8-16, 1009-0085 | 0.316 |
31/64 |
1 |
4 3/8 |
5 7/8 |
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$26.65 | DRST370-3/8-24
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 3/8-24, 1009-0090 | 0.339 |
31/64 |
1 |
4 3/8 |
5 7/8 |
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$45.60 | DRST370-7/16-14
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 7/16-14, 1009-0095 | 0.375 |
17/32 |
1 1/16 |
4 13/16 |
6 5/8 |
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$45.60 | DRST370-7/16-20
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 7/16-20, 1009-0100 | 0.39 |
17/32 |
1 1/16 |
4 13/16 |
6 5/8 |
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$52.65 | DRST370-1/2-13
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: w/Chamfer: 1/2-13, 1009-0105 | 0.437 |
5/8" |
1 1/16 |
5 3/16 |
7 1/8 |
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$53.30 | DRST370-1/2-20
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 1/2-20, 1009-0110 | 0.452 |
5/8" |
1 1/16 |
5 3/16 |
7 1/8 |
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$66.35 | DRST370-5/8-11
| Step Drill 370, HSS, for Holes-to-be-Tapped w/Chamfer: 5/8-11, 1009-0111 | 0.531 |
3/4 |
1 1/16 |
5 5/8 |
7 5/8 |
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