The NBS-4761-MK is our 4.0 metre extension base for our 68mm O.D. base section telescopic mast. The telescopic design of the NBS-4761-MK telescopic mast extensions base allows for extended overall height of your telescopic mast or when the access to lower the bottom telescopic section must be above reachable height. Accessories for permanent or temporary installation/utilisation are available separately, please contact us for more information.

Australian Owned & Manufactured Australian owned & manufactured for 50+ years.
In-house Support Experienced, knowledgeable in-house technical support
Customisation Available Customisation of finish, mounting and equipment fixings available
ISO Quality Certified QA Accredited ISO 9001 / ISO 14001 / ISO 45001


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Height – extended/packed

4.0 metres / 13.12′


Clear anodised aluminium telescopic section with section stop guide, 1 x passivated straight locking clip, 1 x clear anodised aluminium free-rotating guy ring and 1 x machined aluminium flat roof/flat ground mount base

No. of Sections


Weight – Excluding D-clips

4.5 kg / 9.92 lbs

Wind Load Rating – Maximum

160 kph / 99 mph – with section guy wire supported

Maximum Surface Area


Base Section Dimensions

Outside diameter: 76.2mm / 3″

Supplied Accessories

  • 1 x passivated section locking pin with 2 spring clips
  • 1 x NBS-AGR76 – Clear anodised free-rotating guy ring
  • 1 x NBS-BS76 – Flat roof/flat ground mount base

Suitable Accessories
order separate

  • NBS-GR series – 8PLT army green guy rope – available in 5/10/15/20/25 metres
  • NBS-GW series – 304 stainless steel 3.2mm guy wire – available in 5/10/15/20/25 metres

Delivered Packaging

4.1 metre cardboard box with internal packing – 100% recyclable.

Stock Status

In-stock – ready for immediate dispatch

NBS-4761-MK Technical Data Sheet