Stretchers and stitching for round holes

Data required:

1. Nominal bore size and tolerance before broaching - a

2. Nominal hole size and limit deviation after broaching - D

3. Stretching length - L

4. Material - brand, Brinell hardness and tensile strength

5. Machine type - model, horizontal or vertical

6. Pulling force of the machine - Pmax

7. Maximum stroke of the machine - Lmax

8. Method of clamping the broach to the machine

9. Length to the first tooth of the broach - l

10. Type of coolant when broaching


Overall length from 200 mm to 1400 mm.

Outer diameter from 20 to 130 mm.

Cutting length up to 1000 mm.

Data required:

1.Nominal size and limit deviation of keyway width-b

2. Nominal size and limit deviation of the hole diameter - d

3. Nominal size and limit deviation of the channel depth - d + t1

4. Stretching length - L

5. Material - brand, Brinell hardness and tensile strength

6. Machine type - model, horizontal or vertical

7. Pulling force of the machine - Pmax

8. Maximum stroke of the machine - Lmax

9. Method of clamping the broach to the machine

10. Length to the first tooth of the broach - l

11. Type of coolant when broaching


According to the shape of the body and its purpose, broaches are made in four types:

I. - with bold body - for general mechanical engineering

II. - with bold body - for tool production

III. - with normal body - for general mechanical engineering

IV. - with normal body - for tool production



Depending on the type of machine, broaches are manufactured in two versions:

Version A - with short gripping part

Implementation B - with long gripping part

Data required:

1. Nominal bore size and limit deviation before broaching - d

2. Nominal hole size and limit deviation after broaching - D

3. Nominal size and limit deviation of the slot width

of the opening - B

4. Chamfer size - nominal value and tolerance

5. Bevel angle

6. Number of slotted channels - n

7. Stretching length - L

8. Material - brand, Brinell hardness and tensile strength

9. Machine type - model, horizontal or vertical

10. Pulling force of the machine - Pmax

11. Maximum stroke of the machine - Lmax

12. Method of clamping the broach to the machine

13. Length to the first tooth of the broach - l

14. Type of coolant when broaching


Overall length 200 to 1400 mm

Outer diameter 20 to 125 mm

Internal diameter of the broach - not less than 18 mm

Cutting length - up to 950 mm

Data required:

1. Nominal bore size and limit deviation before broaching - d

2. Nominal hole size and limit deviation after broaching - D

3. Module - m

4. Number of teeth - z

5. Angle of engagement - Lg

6. Width of the slotted grooves of the workpiece, measured along the arc

of the dividing circle - nominal value and limit deviations

7. Stretching length - L

8. Material - brand, Brinell hardness and tensile strength

9. Machine type - model, horizontal or vertical

10. Pulling force of the machine - Pmax

11. Maximum stroke of the machine - Lmax

12. Method of clamping the broach to the machine

13. Length to the first tooth of the broach - l

14. Type of coolant when broaching



Overall length 500 to 1200 mm

Outer diameter from 20 to 130 mm

Internal diameter of the broach - not less than 18 mm

Outlet loop angle 30o

Module: 1,25; 1,5; 2; 2,5; 3,4

Length of the cutting part - up to 1000 mm

Data required:

1. Nominal bore size and limit deviation before broaching - d

2. Nominal hole size and limit deviation after broaching - D

3. Nominal size and limit deviation of the width of the square /wrench hole/ - S

4. Stretching length - L

5. Material - brand, Brinell hardness and tensile strength

6. Machine type - model, horizontal or vertical

7. Pulling force of the machine - Pmax

8. Maximum stroke of the machine - Lmax

9. Method of clamping the broach to the machine

10. Length to the first tooth of the broach - l

11. Type of coolant when broaching


Overall length up to 1450 mm

Cutting length up to 1000 mm

Data required:

1. Nominal bore size and limit deviation before broaching - d

2. Nominal hole size and limit deviation after broaching - D

3. Nominal size and limit deviation of the width of the square /wrench hole/ - S

4. Stretching length - L

5. Material - brand, Brinell hardness and tensile strength

6. Machine type - model, horizontal or vertical

7. Pulling force of the machine - Pmax

8. Maximum stroke of the machine - Lmax

9. Method of clamping the broach to the machine

10. Length to the first tooth of the broach - l

11. Type of coolant when broaching

Overall length up to 1450 mm

Cutting length up to 1000 mm

Data required:

1. Material

2. Length of the cut part of the nut - Lr

3. Overall nut length - Lro

4. Average diameter of the nut with allowance - d cf.

5. Outer diameter of the nut with tolerance - d

6. Internal diameter of the nut with tolerance - d1

7. Thread pitch - S

8. Thread profile angle

9. Screw line ascent direction and thread accuracy class

10. Required nut thread standards

11. The brand of the threading machine

12. Type of thread / metric, trapezoidal or tubular /

Thread: metric, trapezoidal, tubular

Overall length up to 650 mm

Outer diameter up to 100 mm