E-mail: Info@ktoolinc.com
Phone# 800-377-3056
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Advantages of K-Tool, Inc.
Back Counterbore Tools
K-Tool, Inc.
BCB
Back
Counterbore
Tools
 Applications: Reverse Counterbores for Standard Inch & Metric Socket Head Cap Screws

 (1) Allows Counterboring of Parts without Adding an Extra Setup
 (2) Existing Hole & Tool Offset Dimensions Provided for ease of Proramming
 (3) 4 Cutting Edges Per Insert
Adjustable Counterbore Tool
Speed & Feed Info.
 Material
S.F.M.
I.P.T.
Mild & Low Carbon Steel
Ex. 1018, 1020, 1117,1141,12L14
 800 -1200 
 .002 - .003 
High Carbon & Alloy Steel
Ex. 1045, 4140, 4340, 52100,8620
 500 - 800 
 .002 - .003 
Lower Carbon Tool Steel
Ex. P-20, H-13, S-7
 400 - 700 
 .002 - .003 
Tool Steel
Ex. A-2, A-6, D-2, M-2
 300 - 600  
 .001 - .003 
Stainless Steel
Ex.304, 316, 420, 15-5PH, 17-4PH
 300 - 600  
 .002 - .003 
Iron
Ex. Cast, Ductile, Nodular
 600 -1000
 .002 - .003 
Nickel &Titanium Alloy
Ex. Inconel, Hastelloy, TI-6AL-4V
 120 -180  
 .001 - .002 
Non-Ferrous metals
Ex. Aluminum, Bronze, Brass 
 1000 - 2500
 .002 - .003 

Back counterbore tools for socket head cap screws

Back
 Tool #
Min. Existing
Hole Dia. 
Offset to
Enter Hole 
BCB-500 
 .320 
.100 
BCB-594 
.390
.110 
BCB-687 
.450
.120 
BCB-781 
.510
.135 
BCB-1000 
.640
.180 
BCB-1187 
.800
.195 
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Back
Counterboring
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Flats are parallel to Insert
0
D
D.O.C.
L-1
L
S
Existing
Hole
Cutting Diameter
Offset to
Enter Hole
o
Click here for insert grade descriptions
 Insert #
 I.C.
T
R
Insert Grades
 .187
 .082
 .015
 X33, X40
 .250
 .125
 .015
 X33, X40
Insert
Information
SPEB / Chipbreaker Inserts
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Back Counterbore Tools

Screw Torque
Information
K-Tool, Inc. BCB VIdeo Link
K-Tool, Inc.
Back Counterbore Tool
Demonstrational
Video
 Tool #
S.H.C.S.
Size 
Flutes 
 D  
 L 
L-1 
 D.O.C. 
 S
Insert
 Screw  
 Wrench  
BCB-500 
   5/16 
 .500 
 2.937 
 1.187 
 .750
 .500 
SPEB-1511CB
 164T
T-6
BCB-594 
   3/8 
 .594 
 2.937 
 1.187 
 .750
 .500 
SPEB-1511CB
 164T
T-6
BCB-687 
   7/16 
 .687 
 3.625 
 1.625 
 1.000
 .750 
SPEB-221CB
 300T
T-8
BCB-781 
   1/2 
 .781 
 3.812 
 1.812
 1.250
 .750 
SPEB-221CB
 314T
T-8
BCB-1000 
   5/8 
 1.000 
 4.562 
 2.312
 1.625
 1.000 
SPEB-221CB
 314T
T-8
BCB-1187 
   3/4
 1.187 
 4.812 
2.562
 1.937
 1.000 
SPEB-221CB
 314T
T-8
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K-Tool, Inc.
Made in the USA
Phone# 800-377-3056
E-mail: Info@ktoolinc.com