South Midlands Communications Group

Pneumatic Telescopic Mast - NX-Series

The NX-Series of telescopic Hilomasts has a base section diameter of 5.9 inches and is pneumatically operated by air compressor. Being heavier than the NL-Series, it will support larger antennas and should be considered as being the maximum size necessary for general use.

Although the NX-Series can be used for portable applications, it is primarily designed for vehicle installation, either bracketed to the rear, or mounted through a roof bearing. Models NX18, NX25 and NX30 can be mounted onto the roof of a vehicle in a sliding carriage. The carriage slides rearwards and the mast is then tilted and clamped in the vertical position. All masts in this NX-Series can be trailer mounted.

The NX30 has a top section diameter of 2 inches for attaching the antenna. All other NX masts have a top spigot of 2 inche diameter x 5.1 inche length. 

The table of masts below is only a small selection of possible mast configurations. Due to the modular design of all Hilomast Pneumatic masts we are able to offer masts in custom sizes, with or without locking collars, and in various colours and finishes. Please contact a member of the sales team for a friendly chat about your requirements.

Mast Height Extended Height Retracted Number Of Sections Diameter Of Top Section Diameter Of Base Section Vertical Headload Max. Wind Speed Unguyed Max. Wind Speed With Top Guys Basic Weight Of Mast
  (ft) (ft)   (inches) (inches) (lbs) (mph) (mph) (lbs)
NX 8 24' 11" 6' 4" 7 3 6 110 96 96 110
NX 10 33' 1" 8' 3" 6 3.5 6 110 75 75 132
NX 12 38' 0" 8' 6" 7 3 6 100 65 65 140
NX 14 44' 7" 8' 8" 8 2.5 6 77 57 59 154
NX 17 55' 9" 9' 0" 8 2 6 70 50 55 172
NX 18 60' 0" 14' 2" 6 3.5 6 66 44 52 205
NX 25 82' 0" 14' 8" 8 2.5 6 44 32 50 243
NX 30 97' 9" 15' 0" 9 2 6 31 27 47 265

† With non-rotating base      * Top guys recommended

The table shows the vertical head load that each mast will support and the maximum operational wind speed. The weight of the antenna, however, is not usually the main criterion when selecting a mast. The limiting factor is usually the ‘side surface area’ of the antenna.

The wind speeds shown are based on the following side surface areas:
NH Masts = 1 ft². NK = 1.5 ft². NL = 2.1 ft². NX = 3.2 ft². NY = 11.8 ft².

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