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standard Burr-Bit diagram

Straight Spring ISO diagram

Burr-Bit DHD diagram

Conical Springs and Collars
for American Standard Taps (See Fig. A)

Part Numbers

Tap Size

B

(in)

C

(in)

D

(in)

S

(in)

Extra
Light

Std. Heavy

Extra Heavy

#2-#4

0.85

.56

.375

.141

8020404

8020405

8020406

#5-#6

M3

0.87

.56

.375

.141

8020604

8020605

8020606

#8

M4

0.87

.62

.375

.168

8020704

8020705

8020706

#10

M5

1.06

.62

.375

.194

8020804

8020805

8020806

#12

1.06

.62

.375

.22

8020904

8020905

8020906

1/4

M6

1.14

.75

.5

.255

8021104

8021105

8021106

5/16

M8

1.25

.85

.562

.318

8021204

8021205

8021206

3/8

M10

1.37

.87

.656

.381

8021304

8021305

8021306

7/16

1.75

.87

.812

.323

8021404

8021405

8021406

1/2

M12

1.8

1.0

.812

.367

8021504

8021505

8021506

9/16

M14

1.89

1.12

1.0

.429

8021604

8021605

8021606

5/8

M16

1.89

1.12

1.0

.48

8021704

8021705

8021706

11/16

1.89

1.12

1.0

.542

8021804

8021805

8021806

3/4

1.93

1.18

1.12

.59

8021904

8021905

8021906

Straight springs and collars
for CNC / European style shank taps: "Reduced Shank Taps"

with standard ANSI shank diameters. (See Fig. B)

Tap Size

B

(in)

C

(in)

D

(in)

S

(in)

Part Number

#2-#4

1.2

.8

.375

.141

8020402

#5-#6

M3

1.2

.8

.375

.141

8020602

#8

M4

1.2

.8

.375

.168

8020702

#10

M5

1.3

.83

.375

.194

8020802

#12

1.3

.83

.375

.22

8020902

1/4

M6

1.6

1.0

.5

.255

8021102

5/16

M8

1.65

1.06

.562

.318

8021202

3/8

M10

1.7

1.0

.656

.381

8021302

7/16

1.9

1.14

.812

.323

8021402

1/2

M12

1.9

1.14

.812

.367

8021502

9/16

M14

2.0

1.26

1.0

.429

8021602

5/8

M16

2.0

1.26

1.0

.48

8021702

11/16

2.0

1.26

1.0

.542

8021802

M18

2.19

1.26

1.12

.542

8021802

3/4

2.19

1.26

1.12

.59

8021902

M20

2.19

1.26

1.12

.652

8021902

Deep Hole Springs and Collars
(DHD) for American Standard Taps (See Fig. C)

Tap Size

B

(in)

C

(in)

E

(in)

S

(in)

Part Number

#2-#4

.141

#5-#6

M3

.141

#8

M4

.168

#10

M5

.194

#12

.22

1/4

M6

1.12

.75

1.25

.255

8021103

5/16

M8

1.13

.8

1.25

.318

8021203

3/8

M10

1.27

.8

1.25

.381

8021303

7/16

1.25

.8

1.25

.323

8021403

1/2

M12

1.25

.8

1.25

.367

8021503

9/16

M14

1.75

1.0

1.5

.429

8021603

5/8

M16

1.75

1.0

1.5

.48

8021703

11/16

1.75

1.0

1.5

.542

8021803

M18

1.75

1.0

1.5

.542

8021803

3/4

1.75

1.0

1.5

.59

8021903

M20

1.75

1.0

1.5

.652

8021903