Hook allowance shall be taken as, 9d, 11d, 13d, and 17d for K values 2,3,4 and 6 respectively and rounded off to the nearest 5mm, but not less than 75mm. For 90-degree bend allowance shall be taken as 5d, 5.5d, 6d and 7d for K values 2,3,4 and 6 respectively and rounded off to the nearest 5mm, but not less than 75mm.


HOOK ALLOWANCE
90 DEGREE BEND ALLOWANCE
Nominal size of Bar
Mild Steel IS:432-1960
Medium Tensile Steel
IS:432-1960
Cold Worked Steel Bars
IS:1786-1961
Mild Steel
Medium Tensile Steel
Cold Worked Steel Bars

Min
mm
Reco.
mm
Min
mm
Reco.
mm
Min
mm
Reco.
mm
Min
mm
Reco.
mm
Min
mm
Reco.
mm
Min
mm
Reco.
mm
5
75
-
75
-
75
-
75
-
75
-
75
-
6
75
-
75
-
75
-
75
-
75
-
75
-
8
75
-
90
-
105
-
75
-
75
-
75
-
10
90
-
110
-
130
-
75
-
75
-
75
-
12
110
-
130
-
155
-
75
-
75
-
75
-
16
145
-
175
-
210
-
80
-
90
-
95
-
20
180
-
220
-
260
-
100
-
110
-
120
-
22
200
-
240
-
285
-
110
-
120
-
130
-
25
225
-
275
-
325
-
125
-
140
-
150
-
28
250
310
310
365
365
475
146
155
155
170
170
195
32
290
350
350
415
415
545
160
175
175
190
190
225
36
325
395
395
470
470
610
180
200
200
215
215
250
40
360
440
440
520
520
680
200
220
220
240
240
280
45
405
495
495
585
585
765
225
250
250
270
270
315
50
450
550
550
650
650
850
250
275
275
300
300
350