IS 12427

TRANSMISSION TOWER BOLTS

IS 12427 : 2001

Steel Hardness: 5.8 , 8.8
Finish: Hot Dip Galvanized

Dimensions / Weight Chart

Dimensions of Hexagon Head Transmission Tower Bolts
Nom. Dia. (d) M12 M16 M20 (M22) M24
Thread Pitch 1.75 2 2.5 2.5 3
b (ref) 20 23 26 28 30
C Max. 0.6 0.8 0.8 0.8 0.8
Da Max. 14.7 18.7 24.4 26.4 28.4
Ds Max. 12.7 16.7 20.84 22.84 24.84
Min. 11.3 15.3 19.16 21.16 23.16
Dw Max. 18 24 30 34 36
Min. 16.47 22 27.7 31.35 33.25
e Min. 19.85 26.17 32.95 37.29 39.55
k Nom. 7.5 10 12.5 14 15
Max. 7.95 10.75 13.4 14.9 15.9
Min. 7.05 9.25 11.6 13.1 14.1
k’ Min. 4.95 6.48 8.12 9.17 9.87
r Min. 0.6 0.6 0.8 0.8 0.8
s Max. 18 24 30 34 36
Min. 17.57 23.16 29.16 33 35
Length — Size Combinations and Grip Ranges
Thread M12 M16 M20 M22 M24
Size d ls Lg Grip ls Lg Grip ls Lg Grip ls Lg Grip ls Lg Grip
Min. Max. Range Min. Max. Range Min. Max. Range Min. Max. Range Min. Max. Range
30 65 10 6-10 – – – – – – – – – – – –
35 11.5 15 11-15 8 12 8-12 – – – – – – – – –
40 16.5 20 16-20 13 17 13-17 9 14 11-14 7 12 8-12 – – –
45 21.5 25 21-25 18 22 18-22 14 19 15-19 12 17 13-17 9 15 11-15
50 26.5 30 26-30 23 27 23-27 19 24 20-24 17 22 18-22 14 20 16-20
55 31.5 35 31-35 28 32 28-32 24 29 25-29 22 27 23-27 19 25 21-25
60 36.5 40 36-40 33 37 33-37 29 34 30-34 27 32 28-32 24 30 36-30
65 41.5 45 41-45 38 42 38-42 34 39 35-39 32 37 33-37 29 35 31-35
70 46.5 50 46-50 43 47 43-47 39 44 40-44 37 42 38-42 34 40 36-40
75 51.5 55 51-55 48 52 48-52 44 49 45-49 42 47 43-47 39 45 41-45
80 56,5 60 56-60 53 57 53-57 49 54 50-54 47 52 48-52 44 50 46-50
85 61.5 65 61-65 58 62 58-62 54 59 55-59 52 57 53-57 49 55 51-55
90 66.5 70 66-70 63 67 63-67 59 64 60-64 57 62 58-62 54 60 56-60
95 71.5 75 71-75 68 72 68-72 64 69 65-69 62 67 63-67 59 65 61-65
100 76.5 80 76-80 73 77 73-77 69 74 70-74 67 72 68-72 64 70 66-70
105 78 82 78-82 74 79 75-79 72 77 73-77 69 75 71-75
110 83 87 83-87 79 84 80-84 77 82 78-82 74 80 76-80
115 88 92 88-92 84 89 85-89 82 87 83-87 79 85 81-85
120 93 97 93-97 89 94 90-94 87 92 88-92 84 90 86-90
125 98 102 98-102 94 99 95-99 92 97 93-97 89 95 91-95
130 103 107 103-107 99 104 100-104 97 102 98-102 94 100 96- I00
135 108 112 108-112 104 109 105-109 102 107 103-107 99 105 101-105
140 113 117 113-117 109 114 110-114 107 112 108-112 I04 110 106-110
145 118 122 118-122 114 119 115-119 112 117 113-117 109 115 111-115
150 123 127 123-127 119 124 120-124 117 I22 118-122 114 120 116-120
155 I28 132 128-132 124 129 125-129 122 I27 123-127 119 125 121-125
160 133 137 133-137 129 I34 130-134 127 132 128-132 124 130 126-130

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