Bolts, Washers & Ground Rods

Washers

Washers for pole-line bolts spread the clamping force of each bolt head and nut over the wood. Corona makes square flat, square curved, round flat and spring lock washers; the curved square washer seats on the round face of the pole. Specify type, size, hole and the quantity you need.

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At a glance

Washers at a glance.

Function

Spreads the load on the wood

A wide washer under the head and nut stops them sinking into the timber as the bolt is tightened and as the wood dries.

Types

Square, curved, round and lock

Square flat washers sit on crossarms and flat faces, curved square washers on the pole, round washers on steel fittings, and spring lock washers under nuts that must not back off.

Product form

2 1/4 to 4 in square

Square 2 1/4 x 2 1/4 to 4 x 4 in (57–102 mm), 3/16 or 1/4 in (5 or 6 mm) thick, 11/16 in holes for 5/8 in bolts and 13/16 in for 3/4 in bolts, galvanized to ASTM A153 / BS 729.

Also known as

Washers for pole-line bolts are square washers and curved square washers in the US and spring washers for the lock type in the UK; in other languages they are rondelle Grower (French), rondella piana (Italian) and arandela plana (Spanish).

English: spring washersquare washerflat washer
United States: curved square washercurved washer
Français: rondelle Grower
Italiano: rondella elasticarondella piana
Español: arandela guasaarandela plana

Trade names for the whole range

How it works

One under the head, one under the nut

A washer goes under the bolt head and another under the nut. On the round face of the pole a curved square washer is used so it bears along its full width. A spring lock washer is added under the nut where the joint must hold against vibration.

Common applications

Where it is used.

Application

Crossarm and brace bolts

Every through bolt in a crossarm assembly takes a washer at each end. The square washer is sized to the bolt diameter.

Application

Spool and secondary fittings

Spool bolts carry lock washers and a round washer as part of their kit. The washers hold the insulator and nut in place.

Application

Guy and attachment hardware

Guy attachments and pole fittings bear on washers at the pole face. Curved washers keep the load even on the round surface.

What are pole-line washers called in other markets?

US suppliers list square washers, curved square washers and curved washers for the pole face; UK and Australian suppliers call the lock type a spring washer. In other languages they include the rondelle Grower in French, rondella piana in Italian and arandela plana in Spanish.

When is a curved washer used instead of a flat square washer?

A curved square washer is used against the round face of the pole, so it bears along its full width instead of rocking on two edges. Flat square washers go on crossarms and flat faces. Corona makes square washers from 2 1/4 x 2 1/4 to 4 x 4 in (57 to 102 mm) with 11/16 or 13/16 in holes.

Pole-Line Assemblies

Used in every bolted assembly

Washers finish the joints in the crossarm, secondary spool, down-guy and attachment assemblies, under Machine / Square Headed Bolt, Hex Headed Bolt, Carriage Bolt and their nuts.

Explore pole-line assemblies

Washers specifications