Double Arming Rod

Double Arming Rod is a double arming bolt: a rod threaded full length with semi-cone points, used where two crossarms are mounted on opposite sides of a pole. Nuts clamp each arm, so the pair shares the pull at angles, dead-ends and heavy crossings. Specify diameter, length and the quantity you need.

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At a glance

Double Arming Rod at a glance.

Function

Ties a pair of crossarms together

At angles and dead-ends a second arm is fitted on the far side of the pole, and double arming bolts through both arms hold the pair as one.

Form

Threaded full length, pointed ends

The thread runs the whole length so nuts can be set wherever the arms sit, and the semi-cone points lead the rod through the bored holes.

Product form

5/8 to 1 1/4 in, 10 to 36 in long

5/8–1 1/4 in (M16–M32) diameters, 10–36 in (250–900 mm) long, to ANSI C135.1, hot dip galvanized to ASTM A153, with 4 square or hex nuts.

Also known as

Also called double arming bolts in the US. Spanish-speaking crews call it perno doble armado.

US English: double arming boltDA bolt
Español (US): perno doble armado

Trade names for the whole range ↗

How it works

Through both arms, nuts on each

The rod passes through bored holes in both crossarms, either side of the pole, and usually near their ends. A nut on each side of each arm fixes its position on the thread. Tightening the nuts spaces and clamps the arms so they cannot twist or slide apart under the pull of the conductors.

Common applications

Where it is used.

Application

Angle poles

Where the line turns, the conductors pull the arms sideways. Doubled arms tied with arming bolts take that pull on both faces of the pole.

Application

Dead-end poles

Where the line ends or is sectioned, the full conductor tension comes onto the arms. Double arming keeps both arms square to the line.

Application

Road and rail crossings

Utilities often double the arms at crossings for extra security. The arming bolts hold the pair at the set spacing.

What else is a double arming rod called?

In the United States it is also called a double arming bolt (DA bolt). In Spanish it is a perno doble armado.

How many nuts does a double arming rod need?

Four: one on each side of each crossarm, so both arms are held at the set spacing either side of the pole. GV supplies each double arming rod with 4 square or hex nuts, in 5/8 to 1 1/4 in (M16 to M32) diameters and 10 to 36 in (250 to 900 mm) lengths.

Pole-Line Assemblies

Part of the crossarm assembly

Double Arming Rod ties doubled crossarms together, while Machine / Square Headed Bolt clamps each arm through the pole and Square Nut and Washers finish the joints.

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Double Arming Rod specifications