Shape & surface
Ovality, straightness, finish and wear affect movement. A positive diameter calculation alone does not guarantee smooth sliding.
DIRECT FROM THE WORKSHOP / PRACTICAL GUIDANCE
Telescopic Carbon Fibre Tubes: Clearance & Tolerances
A receiving tube’s inside diameter and the sliding tube’s outside diameter are the starting point, not the complete fit specification.
Discuss your requirements ↗Calculate the diametral clearance.
Nominal clearance = receiving ID − sliding OD. With a receiving ID of 20.30 mm and sliding OD of 20.00 mm, the nominal diametral clearance is 0.30 mm.
If each diameter has a ±0.10 mm tolerance, the calculated minimum clearance is 20.20 − 20.10 = 0.10 mm; the maximum is 20.40 − 19.90 = 0.50 mm. These are arithmetic examples, not recommended fits.
Why nominal size is not enough.
Overlap & clamps
The overlap, guides and clamp design influence alignment and local loading. Specify the assembly, not only two tube sizes.
Square sections
Corner radii, twist and flat-to-flat dimensions need separate attention. An internal corner can obstruct a mating external corner.
Extended pole length is a different dimension.
The 6–20 m range on our water-fed pole page describes the custom extended assembly length. It is not the length of a single tube section or a guaranteed working reach. Collapsed length, section count and accessories depend on the agreed design.
Check a fit or discuss an assembly.
LET’S MAKE IT CLEAR.
What are
you building?
You don’t need a complete specification to start a conversation. Tell us the application and what you know so far.
sales@fibreparts.com ↗