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Solid Counterbores and Step Drills


Inch Size 3 Flute Capscrew Counterbores
Inch Size 3 Flute Capscrew CounterboresClick for a Bigger Picture
High speed steel, for socket cap screws.
3 Flute capscrew counterbores have larger pilots than 2 Flute solid counterbores.
With straight shanks.
Quantity Price Model Description Screw Size Pilot Diam. Cutter Diam. Shank Diam.

$9.10 CBCS-5 #5 HS 3Fl Capscrew Counterbore 5 .141" .221" 3/16"

$9.10 CBCS-6 #6 HS 3Fl Capscrew Counterbore 6 0.15 0.242 7/32

$9.10 CBCS-8 #8 HS 3Fl Capscrew Counterbore 8 11/64 19/64 1/4

$10.30 CBCS-10 #10 HS 3Fl Capscrew Counterbore 10 13/64 21/64 5/16

$12.05 CBCS-1/4 1/4" HS 3Fl Capscrew Counterbore 1/4 9/32 13/32 3/8

$14.15 CBCS-5/16 5/16" HS 3Fl Capscrew Counterbore 5/16 11/32 1/2 7/16

$15.60 CBCS-3/8 3/8" HS 3Fl Capscrew Counterbore 3/8 13/32 19/32 1/2

$18.65 CBCS-7/16 7/16" HS 3Fl Capscrew Counterbore 7/16 15/32 11/16 1/2

$20.40 CBCS-1/2 1/2" HS 3Fl Capscrew Counterbore 1/2 17/32 25/32 1/2

$29.90 CBCS-5/8 5/8" HS 3Fl Capscrew Counterbore 5/8 21/32 31/32 3/4

$41.60 CBCS-3/4 3/4" HS 3Fl Capscrew Counterbore 3/4 13/16 1 3/16 1

Metric Capscrew Counterbores
Metric Capscrew CounterboresClick for a Bigger Picture
High speed steel, for metric socket cap screws.
Most sizes have 3 flutes, but some may have 4 flutes.
Straight shank, except for some of the largest sizes, as specified.
Quantity Price Model Description Screw Size Pilot Diam. Cutter Diam. Shank Diam.

$10.40 CBCS-M3 3mm HS Capscrew Counterbore 3mm 3.4mm 6mm 0.2185

$11.30 CBCS-M4 4mm HS Capscrew Counterbore 4mm 4.5mm 8mm 0.3122

$14.50 CBCS-M5 5mm HS Capscrew Counterbore 5mm 5.5mm 10mm 0.3747

$16.00 CBCS-M6 6mm HS Capscrew Counterbore 6mm 6.6mm 11mm 0.4371

$16.00 CBCS-M8 8mm HS Capscrew Counterbore 8mm 9mm 15mm 0.4996

$17.60 CBCS-M10 10mm HS Capscrew Counterbore 10mm 11mm 18mm 0.4996

$19.10 CBCS-M12 12mm HS Capscrew Counterbore 12mm 14mm 20mm 0.4996

$25.30 CBCS-M14 14mm HS Capscrew Counterbore, TS 14mm 15mm 24mm MT2

$30.10 CBCS-M16 16mm HS Capscrew Counterbore, SS 16mm 17mm 26mm 1"

$30.10 CBCS-M16T 16mm HS Capscrew Counterbore, TS 16mm 17mm 26mm MT2

Capscrew Counterbores Sets
High speed steel, for socket cap screws.
Larger pilots than 2-flute solid counterbores. Straight shank
Quantity Price Model Description Sizes

$33.50 CBCS-ST11 Capscrew Counterbore Set, 3 flutes, #6 - 1/4" #6, 8, 10, 1/4

$47.50 CBCS-ST12 Capscrew Counterbore Set, 3 flutes, 1/4" - 1/2" 1/4, 5/16, 3/8, 1/2

$77.00 CBCS-ST13 Capscrew Counterbore Set, 3 flutes, #6 - 1/2" #6, 8, 10, 1/4, 5/16, 3/8, 1/2

$63.80 CBCS-ST21 Capscrew Counterbore Set, 4 flutes, 3mm-10mm 3mm,4mm, 5mm, 6mm, 8mm, 10mm

2 Flute Solid Counterbores
2 Flute Solid CounterboresClick for a Bigger Picture
2 Flute. High Speed Steel. For socket cap screws
Quantity Price Model Description Pilot/Screw Size Cutting Size Overall Length

$8.25 CB2-3 # 3 HS 2 Fl Solid Counterbore .098/#3 .176" 2 1/2"

$7.15 CB2-4 # 4 HS 2 Fl Solid Counterbore .111/#4 0.198 2 5/8

$7.75 CB2-5 # 5 HS 2 Fl Solid Counterbore .124/#5 0.22 2 5/8

$8.00 CB2-6 # 6 HS 2 Fl Solid Counterbore .137/#6 0.241 2 5/8

$8.50 CB2-8 # 8 HS 2 Fl Solid Counterbore .163/#8 0.285 2 3/4

$9.15 CB2-10 # 10 HS 2 Fl Solid Counterbore .189/#10 0.328 2 7/8

$10.20 CB2-12 # 12 HS 2FL Solid Counterbore .215/#12 0.372 3

$14.70 CB2-1/4 1/4" HS 2 Fl Solid Counterbore 1/4" 13/32 3 5/8

$15.40 CB2-5/16 5/16" HS 2 Fl Solid Counterbore 5/16" 15/32 4

$17.60 CB2-3/8 3/8" HS 2 Fl Solid Counterbore 3/8" 19/32 4 3/8

$19.90 CB2-7/16 7/16" HS 2 Fl Solid Counterbore 7/16" 21/32 4 3/4

$21.60 CB2-1/2 1/2" HS 2 Fl Solid Counterbore 1/2" 25/32 5 1/8

Unibit Step Drills
Unibit Step DrillsClick for a Bigger Picture
High speed steel. For cutting thin materials such as sheet metal.
One tool will cut multiple hole sizes, reducing toolbox clutter.
Self-starting. Easy to sharpen tip. Shank has 3 flats.
Made in USA by Irwin Unibit.
Quantity Price Model Description No. of Hole Sizes Hole Sizes (Increment) Shank Size Length Step Thickness

$22.10 UNI-1 #1 Unibit Step Drill 13 1/8" to 1/2" (1/32") 1/4" 1/8"

$22.10 UNI-2 #2 Unibit Step Drill 6 3/16" to 1/2" (1/16") 1/4" 3/8"

$39.80 UNI-3 #3 Unibit Step Drill 9 1/4" to 3/4" (1/16") 3/8" 1/8"

$47.10 UNI-4 #4 Unibit Step Drill 12 3/16" to 7/8" (1/16") 3/8" 1/8"

$83.50 UNI-5 #5 Unibit Step Drill 10 1/4" to 1-3/8" (1/8") 1/2" 1/8"

Style 371 Step Drills for Cap Screw Clearance
Style 371 Step Drills for Cap Screw ClearanceClick for a Bigger Picture
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.
Quantity Price Model Description Minor Diameter Major Diameter Step Length Flute Length Overall Length

$11.65 DRST371-4 #4 371 Step Drill for Capscrew Clearance 0.136 7/32 3/8 2 1/2 3 3/4

$12.25 DRST371-5 #5 371 Step Drill for Capscrew Clearance 0.141 No. 1 3/8 2 5/8 3 7/8

$12.90 DRST371-6 #6 371 Step Drill for Capscrew Clearance 0.15 1/4 1/2 2 3/4 4

$14.85 DRST371-8 #8 371 Step Drill for Capscrew Clearance 0.178 L 1/2 2 15/16 4 1/4

$16.25 DRST371-10 #10 371 Step Drill for Capscrew Clearance 0.204 Q 5/8 3 7/16 4 3/4

$18.75 DRST371-1/4 1/4" 371 Step Drill for Capscrew Clearance 9/32 13/32 11/16 - 5 1/4

$24.90 DRST371-5/16 5/16" 371 Step Drill for Capscrew Clearance 11/32 1/2 3/4 - 6

$39.80 DRST371-3/8 3/8" 371 Step Drill for Capscrew Clearance 13/32 19/32 7/8 - 7 1/8

$47.50 DRST371-7/16 7/16" 371 Step Drill for Capscrew Clearance 15/32 21/32 1 - 7 1/8

$64.50 DRST371-1/2 1/2" 371 Step Drill for Capscrew Clearance 17/32 25/32 1 - 5 1/8

$85.00 DRST371-5/8 5/8" 371 Step Drill for Capscrew Clearance 21/32 29/32 1 - 5 5/8

Style 372 Step Drills for Flat Head Screws
Style 372 Step Drills for Flat Head ScrewsClick for a Bigger Picture
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
Quantity Price Model Description Minor Diameter Major Diameter Step Length Flute Length Overall Length

$13.10 DRST372-4 #4 372 Step Drill for Flat Head Screws 0.116 15/64 3/8 2-5/8 3 7/8

$13.70 DRST372-5 #5 372 Step Drill for Flat Head Screws 0.128 F 3/8 2-7/8 4 1/8

$14.35 DRST372-6 #6 372 Step Drill for Flat Head Screws 0.142 9/32 1/2 2-15/16 4 1/4

$16.90 DRST372-8 #8 372 Step Drill for Flat Head Screws 0.169 Q 1/2 3-7/16 4 3/4

$18.50 DRST372-10 #10 372 Step Drill for Flat Head Screws 0.196 W 5/8 3-3/4 5 1/8

$22.90 DRST372-1/4 1/4" 372 Step Drill for Flat Head Screws 0.257 1/2 11/16 4-13/16 6 5/8

$35.90 DRST372-5/16 5/16" 372 Step Drill for Flat Head Screws 0.320 5/8 3/4 5-3/16 7 1/8

$49.70 DRST372-3/8 3/8" 372 Step Drill for Flat Head Screws 0.383 3/4 7/8 5-5/8 7 5/8

$64.60 DRST372-7/16 7/16" 372 Step Drill for Flat Head Screws 0.446 13/16 1 3-3/8 5 1/4*

$68.90 DRST372-1/2 1/2" 372 Step Drill for Flat Head Screws 0.510 7/8 1 3-1/2 5 1/2*

Style 370 Step Drills for Holes-To-Be-Tapped
Style 370 Step Drills for Holes-To-Be-TappedClick for a Bigger Picture
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
Quantity Price Model Description Minor Diameter Major Diameter Step Length Flute Length Overall Length

$12.10 DRST370-5-40 5-40 370 Step Drill for holes to tap 0.101 9/64 1/2 1 3/4 2 7/8

$12.25 DRST370-6-32 6-32 370 Step Drill for holes to tap 0.109 5/32 1/2 2 3 1/8

$12.50 DRST370-8-32 8-32 370 Step Drill for holes to tap 0.136 3/16 1/2 2 5/16 3 1/2

$12.75 DRST370-8-36 8-36 370 Step Drill for holes to tap 0.136 3/16 1/2 2 5/16 3 1/2

$13.25 DRST370-10-24 10-24 370 Step Drill for holes to tap 0.152 1/4 5/8 2 3/4 4

$13.25 DRST370-10-32 10-32 370 Step Drill for holes to tap 0.161 1/4 5/8 2 3/4 4

$15.50 DRST370-12-24 12-24 370 Step Drill for holes to tap 0.179 9/32 11/16 2 15/16 4 1/4

$16.40 DRST370-1/4-20 1/4-20 370 Step Drill for holes to tap 0.204 21/64 13/16 3 5/16 4 5/8

$16.75 DRST370-1/4-28 1/4-28 370 Step Drill for holes to tap 0.218 21/64 13/16 - 4 5/8

$18.75 DRST370-5/16-18 5/16-18 370 Step Drill for holes to tap 0.261 13/32 15/16 - 5 1/4

$19.00 DRST370-5/16-24 5/16-24 370 Step Drill for holes to tap 0.272 13/32 15/16 - 5 1/4

$24.80 DRST370-3/8-16 3/8-16 370 Step Drill for holes to tap 0.316 31/64 1 - 5 7/8

$25.25 DRST370-3/8-24 3/8-24 370 Step Drill for holes to tap 0.339 31/64 1 - 5 7/8

$43.20 DRST370-7/16-14 7/16-14 370 Step Drill for holes to tap 0.375 17/32 1 1/16 - 6 5/8

$43.20 DRST370-7/16-20 7/16-20 370 Step Drill for holes to tap 0.39 17/32 1 1/16 - 6 5/8

$49.90 DRST370-1/2-13 1/2-13 370 Step Drill for holes to tap 0.437 5/8 1 1/16 - 7 1/8

$50.50 DRST370-1/2-20 1/2-20 370 Step Drill for holes to tap 0.452 5/8 1 1/16 - 7 1/8

$62.90 DRST370-5/8-11 5/8-11 370 Step Drill for holes to tap 0.531 3/4 1 1/16 - 7 5/8

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Victor Machinery Exchange, Inc.
56 Bogart Street
Brooklyn, NY 11206-3817


Phone: 800-723-5359
International: 718-366-9293
Fax: 718-366-7026
Email: Sales@victornet.com