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TRANSMISSION TOWER BOLTS IS 12427 : 2001 Steel Hardness: 4.6,5.6 ,8.8 Finish: Zinc Plated/ Hot Dip Galvanized

Solar Panel & Transmission Tower Line Fasteners (ASTM A394)

 

Transmission Tower bolts are special types of fasteners used in electricity transmission towers and construction of Solar Panels..Bhalla Fasteners manufactures the entire range of fasteners used in Solar Panel and Transmission Line Towers used in power Transmission & Distribution (T&D), making Bhalla Fasteners one of the largest transmission tower manufacturing facility in India under one roof.

Bhalla fasteners established in 1988 has  proven its excellence and has capabilities to design, manufacture and supply Transmission Lines up to 1,100 kV.

Bhalla Fasteners meet all ASTM Specifications of Tower Bolts and Step Bolts.

We customize based on drawing any size of step bolt ranging in diameter from ½” – 1” and to 8 inches in length.
Tensile stength based on the thread stress area A is calculated as follows:
A=0.7854[D-(0.9743/N)]2
where D = nominal Diameter, and N = threads per inch.

A394 Tower Bolts come in the following Types/grades:

Type 1 – Hot-dip zinc coated bolts made of low or medium carbon steel(MOSTLY USED)

Type 2 – Hot-dip zinc coated bolts made of medium carbon steel, quenched and tempered
Type 3 – Bare (uncoated). quenched and tempered bolts made of weathering steel

Unless otherwise specified, all nuts on these bolts shall be hex style and conform to the requirements of Specification A563

Suitable washers for use with Type 1 are hot-dip zinc-coated carbon-steel washers with dimensions that are in accordance with Specification F436.
Suitable washers for use With Type 2 bolts are hot-dip zinc- coated
Suitable washers for use with Type 3 bolts are Type 3 hardened-steel washers that are in accordance with Specification F436.

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Weight Table

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