Hex Headed Bolt

Hex Headed Bolt is a hexagon-head through bolt for crossarms, brackets and fittings on utility poles, the pattern many UK and Commonwealth utilities specify to BS 4190. It is tightened with a standard spanner or socket at either end. Specify diameter, length, property class, finish and the quantity you need.

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At a glance

Hex Headed Bolt at a glance.

Function

Through-bolts fittings to the pole

The bolt passes through the fitting and the pole, and a hex nut clamps the joint tight.

Pattern

Hex head to BS 4190

UK and Commonwealth networks often specify hexagon bolts to BS 4190 or BS 3692 in property classes 4.6, 5.6 or 8.8, where North American lines use square heads.

Product form

1/4 to 1 1/4 in, M6 to M32

1/4–1 1/4 in (M6–M32) diameters, 2–40 in (50–1000 mm) long with up to 6 in (150 mm) of thread, galvanized to BS 729 / ISO 1461 or ASTM A153.

Also known as

Hex Headed Bolts are hex bolts or hex head machine bolts in the US; in other languages they are vis à tête hexagonale (French), Sechskantschraube (German) and bullone testa esagonale (Italian).

United States: hex bolthex head machine bolthex machine bolt
Français: vis à tête hexagonale
Deutsch: Sechskantschraube
Italiano: vite testa esagonalebullone testa esagonale

Trade names for the whole range

How it works

Pass through, then tighten the nut

The fitting and pole are bored to suit the bolt. The bolt goes through with a washer under the head, and a washer and hex nut go on the far side. The nut is tightened with a spanner or socket until the fitting is clamped to the pole.

Common applications

Where it is used.

Application

Crossarms on UK-pattern networks

Where the utility specification calls for hex bolts, they take the place of square-head bolts in crossarm and brace fixings.

Application

Brackets, stays and pole fittings

Transformer platforms, stay brackets and cable fittings are bolted through the pole. The bolt length follows the pole diameter at each fitting.

Application

Metric and property-class orders

Projects written to metric thread and a named property class order hex bolts from M6 to M32 in class 4.6, 5.6 or 8.8.

What are hex pole bolts called in other markets?

In the US they are hex bolts, hex head machine bolts or hex machine bolts. In other languages they are a vis à tête hexagonale in French, a Sechskantschraube in German and a bullone testa esagonale or vite testa esagonale in Italian.

Which standards and property classes are hex bolts made to?

Buyers in the UK and Commonwealth usually name BS 4190 or BS 3692 and a property class of 4.6, 5.6 or 8.8; North American orders name ASTM A307 Grade A. Corona makes the bolt to the standard and class on the order, galvanized to BS 729 / ISO 1461 or ASTM A153.

Pole-Line Assemblies