Clark Masts A Will-Burt Company

Telephone +44 (0)1983 563691 / 567090

Compact and Robust

> Headloads up to 30kg
> Heights from 2.5m to 9.15m
> Keyed sections

ST Series

The ST Series of masts are the start of the Clark Masts telescopic mast range featuring keyed sections to prevent rotation. Made from high strength 3" diameter 3.25mm wall aircraft grade aluminium alloy with a choice of either non turnable or turnable versions. Plain collars or clamped (locking) collars are available. 


Unlike the lighter weight non keyed QT Series, ST Series masts can be extended using a handpump, compressor or using the vehicle air system, keyed sections make them suitable for use with headloads requiring to be rotated and locked into position. The ST Series of masts also feature in the DAF mast range when a set of field legs are fitted.  ST masts can be fitted permanently to vehicles or shelters, temporarily using saddle clamps or they can be used in conjunction with our range of folding tripod stands.

ST Mast mounted on Mk4 Tripod stand


Accessories can be painted to match the mast

3" Mast Wall Mounting Bracket - 9920

A compact 2 piece aluminium mounting bracket for use with 3" base tube ST and SQT masts.

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Hand Pump - 41157

Hand pump for use with all Clark Masts, supplied with integral stand and 3m of air hose and bayonet connector.

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Mark 4 Tripod Stand - 9427

Stable and robust, tripod stand for field mounting of QT,ST and NT Series masts up to 15m.

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Mark 6 Tripod Stand

The Mark 6 folding tripod is made from stainless steel and supplied in a natural finish (silver). Very compact when folded up and much lighter than the Mark 4 version. A range of sizes are avaiable for masts up to 15m extended height. It is suitable for QT, ST and NT masts. 

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Mast Air Connection Kit - 30090

This kit contains all you need to connect your mast to the air compressor, comprising 3m of rubber air hose, male bayonet connector, female bayonet socket for the mast with seals and hose clips.

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Mast Mounting Ring

A mounting ring with a single stud fixing available in sizes 2.5", 3" and 3.5" suitable for QT masts, ST and NT Series.

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Model 40 Powerpack

Model 40 Powerpacks are suitable for masts from ST to YT. Powered by vehicle electrics either 12 or 24v DC normally operated using a remote control lead 2.5m long. A built in pressure switch cuts out when the mast reaches its preset level and cuts in only when required to top up the pressure thereby saving battery power. Supplied with power connection plug.

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Model 40E Powerpack

Model 40E Powerpacks are similar to the Model 40 and are suitable for masts from ST to YT Series but are operated by a switch directly on the facia of the unit and cannot be used with a remote control lead. Powered by vehicle electrics they have a built in pressure switch which cuts out when the preset level is reached and cut in only when required to top up air pressure thereby saving battery power.

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Saddle Clamp 3" - 2433

The 3" saddle clamp is used for temporary or short term mounting of the mast onto a vertical surface. It provides a secure mounting for the mast which can be quickly opened to remove the mast, they are normally used in pairs and other mounting brackets are not required. 

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Side Handles

This side handle clamps to the mast to provide a turning handle on a rotatable mast.

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ST Handpump

An integral handpump for ST Series masts fixed to the mast using a twin clamp

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ST Lower Mounting Bracket - 16686

Lower mounting bracket for ST (3") masts 

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ST Roof Bearing - 1976

Roof bearing for internal mast mounting

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ST Upper Mounting Bracket - 14586

Upper Mounting Bracket for ST (3") masts

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Top Guy Kit 3 Way

Top guy kit 3 way for QT,ST and NT Series masts up to 12 metres.

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Technical Data

  • MIL STD 810F
  • Headloads up to 30kg
  • 3" Base tube diameter

Can't find what you're looking for? Call +44 (0)1983 563691 or email us at - our sales team are ready to help!

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