BSI Typical Bend Shapes

Shape Code	00

Total Length of bar. L measured along center line.	A

Shape Code	01

Total Length of bar. L measured along center line.	A - Stock Lengths. See Note 4.

Shape Code	11

Total Length of bar. L measured along center line.	A + (B) - 0.5r - d

Shape Code	12

Total Length of bar. L measured along center line.	A + (B) - 0.43R - 1.2d Neither A nor B shall be less than (R+6d)

Shape Code

Total Length of bar. L measured along center line.

A + (B) - 0.43R - 1.2d

Neither A nor B shall be less than (R+6d)

Shape Code	13

Total Length of bar. L measured along center line.	A + 0.57B + (C) - 1.6d B shall not be less than 2(r+d)

Shape Code

Total Length of bar. L measured along center line.

A + 0.57B + (C) - 1.6d

B shall not be less than 2(r+d)

Shape Code	14

Total Length of bar. L measured along center line.	A + (C) - 4d

Shape Code	15

Total Length of bar. L measured along center line.	A + (C)

Shape Code	21

Total Length of bar. L measured along center line.	A + B + (C) - r - 2d

Shape Code	22

Total Length of bar. L measured along center line.	A + B + C + (D) - 1.5r - 3d C shall not be less than 2(r+d). (D) shall not be less than C/2 +5d

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (D) - 1.5r - 3d

C shall not be less than 2(r+d).

(D) shall not be less than C/2 +5d

Shape Code	23

Total Length of bar. L measured along center line.	A + B + (C) - r - 2d

Shape Code	24

Total Length of bar. L measured along center line.	A + B + (C) A and (C) are at 90° to one another

Shape Code

Total Length of bar. L measured along center line.

A + B + (C)

A and (C) are at 90° to one another

Shape Code	25

Total Length of bar. L measured along center line.	A + B + (E) If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code

Total Length of bar. L measured along center line.

A + B + (E)

If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code	26

Total Length of bar. L measured along center line.	A + B + (C)

Shape Code	27

Total Length of bar. L measured along center line.	A + B + (C) - 0.5r - d

Shape Code	28

Total Length of bar. L measured along center line.	A + B + (C) - 0.5r - d If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code

Total Length of bar. L measured along center line.

A + B + (C) - 0.5r - d

If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code	29

Total Length of bar. L measured along center line.	A + B + C + (D) - r - 2d

Shape Code	31

Total Length of bar. L measured along center line.	A + B + C + (D) - 1.5r - 3d

Shape Code	32

Total Length of bar. L measured along center line.	A + B + C + (D) - 1.5r - 3d If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (D) - 1.5r - 3d

If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. See Note 1.

Shape Code	33

Total Length of bar. L measured along center line.	2A + 1.7B + 2(C) - 4d A shall not be less than 12d + 30 B shall not be less than 2(r + d)/p> (C) shall not be less than B/2 + 5d See Note 3

Shape Code

Total Length of bar. L measured along center line.

2A + 1.7B + 2(C) - 4d

A shall not be less than 12d + 30

B shall not be less than 2(r + d)/p>

See Note 3

Shape Code	34

Total Length of bar. L measured along center line.	A + B + C + (E) - 0.5r - d See Note 1

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (E) - 0.5r - d

See Note 1

Shape Code	35

Total Length of bar. L measured along center line.	A + B + C + (E) - 0.5r - d See Note 1

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (E) - 0.5r - d

See Note 1

Shape Code	36

Total Length of bar. L measured along center line.	A + B + C + (D) - r - 2d See Note 1

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (D) - r - 2d

See Note 1

Shape Code	41

Total Length of bar. L measured along center line.	A + B + C + D + (E) - 2r - 4d May also be used for flag link viz:

Shape Code

Total Length of bar. L measured along center line.

A + B + C + D + (E) - 2r - 4d

May also be used for flag link viz:

Shape Code	44

Total Length of bar. L measured along center line.	A + B + C + D + (E) - 2r - 4d

Shape Code	46

Total Length of bar. L measured along center line.	A + 2B + C + (E) See Note 1

Shape Code

Total Length of bar. L measured along center line.

A + 2B + C + (E)

See Note 1

Shape Code	47

Total Length of bar. L measured along center line.	2A + B + 2C + 1.5r - 3d (C) and (D) shall be equal and less than A Where (C) and (D) are to be minimized, the following formula may be used: L = 2A + 2B + max(16d, 160)

Shape Code

Total Length of bar. L measured along center line.

2A + B + 2C + 1.5r - 3d

Where (C) and (D) are to be minimized, the following formula may be used:

L = 2A + 2B + max(16d, 160)

Shape Code	51

Total Length of bar. L measured along center line.	2(A + B + (C)) - 2.5r - 5d (C) and (D) shall be equal and less than A and B Where (C) and (D) are to be minimized, the following formula may be used: L = 2A + 2B + max(16d, 160)

Shape Code

Total Length of bar. L measured along center line.

2(A + B + (C)) - 2.5r - 5d

Where (C) and (D) are to be minimized, the following formula may be used:

L = 2A + 2B + max(16d, 160)

Shape Code	56

Total Length of bar. L measured along center line.	A + B + C + (D) + 2(E) - 2.5r - 5d (E) and (F) shall be equal and not more than B and C

Shape Code

Total Length of bar. L measured along center line.

A + B + C + (D) + 2(E) - 2.5r - 5d

(E) and (F) shall be equal and not more than B and C

Shape Code	63

Total Length of bar. L measured along center line.	2A + 3B + 2(C) -3r - 6d (C) and (D) shall be equal and less than A and B Where (C) and (D) are to be minimized, the following formula may be used: L = 2A + 3B + max(14d, 150)

Shape Code

Total Length of bar. L measured along center line.

2A + 3B + 2(C) -3r - 6d

Where (C) and (D) are to be minimized, the following formula may be used:

L = 2A + 3B + max(14d, 150)

Shape Code	64

Total Length of bar. L measured along center line.	A + B + C + 2D + E + (F) - 3r - 6d See Note 2

Shape Code

Total Length of bar. L measured along center line.

A + B + C + 2D + E + (F) - 3r - 6d

See Note 2

Shape Code	67

Total Length of bar. L measured along center line.	A

Shape Code	75

Total Length of bar. L measured along center line.	π(A - d) + B Where B is the lap

Shape Code

Total Length of bar. L measured along center line.

π(A - d) + B

Where B is the lap

Shape Code	77

Total Length of bar. L measured along center line.	Cπ(A - d) Where B is greater than A/5 this equation no longer applies in which case the following formula may be used: L = C((π(A - d))² + B²)^0.5

Shape Code

Total Length of bar. L measured along center line.

Cπ(A - d)

Where B is greater than A/5 this equation no longer applies

in which case the following formula may be used:

L = C((π(A - d))² + B²)^0.5

Shape Code	98

Total Length of bar. L measured along center line.	A + 2B + C + (D) -2r - 4d Isometric sketch

Shape Code

Total Length of bar. L measured along center line.

A + 2B + C + (D) -2r - 4d

Isometric sketch

Shape Code	99
	All other shapes where standard shapes cannot be used. No other shape code number, form of designation or abbreviation shall be used in scheduling A dimensioned sketch shall be drawn over the dimension columns A to E. Every dimension shall be specified and the dimension that is to allow for permissible deviations shall be indicated in parenthesis, otherwise the fabricator is free to choose which dimension shall allow for tolerance
Total Length of bar. L measured along center line.	To be calculated See Note 2.

Shape Code

All other shapes where standard shapes cannot be used.

No other shape code number, form of designation or abbreviation shall be used in scheduling

A dimensioned sketch shall be drawn over the dimension columns A to E.

Every dimension shall be specified and the dimension that is to allow for permissible deviations shall be indicated in parenthesis, otherwise the fabricator is free to choose which dimension shall allow for tolerance

Total Length of bar. L measured along center line.

To be calculated

See Note 2.

The values for minimum radius and end projection, r and P respectively (Minimum radius for scheduling and Minimum end projection) shall apply to all shape codes.

The Dimensions in parentheses are the free dimensions, If a shape given in this table is required but a different dimension is to allow for the prossible deviations, the shape shall be drawn out and given the shape code 99 and the free dimension shall be indicated in parenthesis.

The length of straight between two bends shall be at least 4d, where d is the diameter of the bar.

NOTE 1: The length equations for shape codes 14, 15, 25, 26, 27, 28, 29, 34, 35, 36, and 46 are approximate and where the bend angle is greater than 45°, the length should be calculated more accurately allowing for the difference between the specified overall dimensions and the true length measured along the central axis of the bar. When the bending angles approach 90°, it is preferable to specify shape code 99 with a fully dimensioned sketch.

NOTE 2: Five bends or more might be impractical within permitted tolerances.

NOTE 3: For shapes with straight and curved lengths (e.g. shape codes 12, 13, 22, 33, and 47) the largest practical mandrel size for the production of a continuous curve is 400 mm.

NOTE 4: Stock lengths are available in a limited number of lengths (e.g. 6m, 12m). Dimension A for shape code 01 should be regarded as indicative and used for the purpose of calculating total length. Actual delivery lengths should be by agreement with the supplier. Also, tolerances for shape code 01, stock lengths, shall be subject to the relevant product standard, e.g. BS 4449:2005.

Source
BSI British Standard documentation