Lag Bolt

Lag Bolt is a lag screw: a hex or square head on a coarse wood-screw thread, used to fix brackets, steps and fittings to one face of a wood pole. It comes with a regular gimlet point or a fetter drive pilot point, and is called a coach screw in the UK and Australia. Specify diameter, length, head, point and the quantity you need.

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At a glance

Lag Bolt at a glance.

Function

Fixes fittings into the pole face

A lag screw holds a fitting to the pole without going through it, where a through bolt is not needed or cannot be fitted.

Point

Gimlet or fetter drive

A gimlet point is turned into a pilot hole with a wrench; a fetter drive point is started with a hammer and then turned home.

Product form

1/4 to 1 in, 2 1/2 to 6 in long

1/4–1 in (M6–M25) diameters, 2 1/2–6 in (60–150 mm) long, hexagon or square head, to ASME B18.2.1, hot dip galvanized to ASTM A153.

Also known as

Lag Bolts are lag screws in the US, with fetter drive lag screws for driven installs, and coach screws in the UK and Australia; in other languages they are Sechskant-Holzschraube (German) and tirafondo (Italian).

English: lag screwcoach screw
United States: fetter drive lag screwgimlet point lag screw
Deutsch: Sechskant-Holzschraube
Italiano: tirafondo

Trade names for the whole range

How it works

Pilot hole, then wrench it home

A pilot hole is bored into the pole for the thread. The lag screw is started through the fitting, by hand or with a hammer for a fetter drive point, and turned in with a wrench until the head pulls the fitting tight against the wood.

Common applications

Where it is used.

Application

Brackets and fittings

Cable guards, riser brackets, sign plates and small fittings are fixed to one face of the pole. Lag screws hold them without boring right through.

Application

Pole steps

Steps are fixed up the pole with lag screws where the utility's standard calls for them. Galvanized heads stand up to the weather.

Application

Maintenance work

Crews use lag screws to refit or add fittings on existing poles. No hole through the full pole is needed.

What are lag bolts called in other markets?

In the US they are lag screws, with fetter drive lag screws and gimlet point lag screws named by point type. In the UK and Australia they are coach screws. In German they are a Sechskant-Holzschraube and in Italian a tirafondo.

What is the difference between a gimlet point and a fetter drive lag screw?

A gimlet point lag screw is turned into a bored pilot hole with a wrench. A fetter drive lag screw has a pilot point that lets it be started with a hammer before it is turned home. Corona makes both, with hexagon or square heads, in 1/4 to 1 in (M6 to M25) diameters.

Pole-Line Assemblies