What Does CDS Mean?
CDS stands for ‘ Cold Drawn Seamless’.
Alloy steels such as T45 and 4130 are CDS
tubes, along with aluminiums, stainless, and
It is more common that when people say CDS
tube, they are referring to more commercial
and economically priced variant of a CDS
Aerocom usually offer AEROCOM33 or
commercial tubes like E355 or E235 when
asked for a CDS tube.
Is T45 or 4130 tube lighter than
No, this is a common misconception.
Within 0.00 of a kilo, they are identical
With the majority of alloys being 95 – 98%
iron, the finishing elements tend not to
make any difference.
Why This Theory?
This is due to the extra strength the
high strength alloys hold. Due to a
product like T45 tube and 4130 tube
having higher mechanical properties, a
user can sometimes select a thinner
wall thickness or smaller diameter, and
still maintain the structural strength
What does BS5 T100 & BS6 S100
These are British Standard Institute
(BSI) publications, specific to seamless
steel tubes and wrought steel. As they
are a BSI publication, they will
predominantly only be applicable to a
British standard material.
T45 & 4130 Tube for
BS T45 tube specification was written in 1948
and 4130 tube specification was written in
1950, both for aerospace and military
BS T45 tube specification = British Standard.
Usages for this material came from
aerostructures such as Spitfire and Hurricane
4130 tube specification had a similar demand
in its development due to World War activities.
BS T45 tube specifications
The BS T45 tube specification is British
Standard, and as such, core demands come
from the UK. Originally, usages for this material
came from aerostructures such as fuselage
detail on Spitfires and Hurricanes, and was a
driving factor behind its development as an
aerospace product. Advancement over
subsequent years saw the materials advantages
used elsewhere in other markets, and although
the specification was made obsolete in 1979, it
is still produced and used extensively in the UK
T45 or 4130? Which is Better?
We couldn’t possibly answer that question!
In our 60 years of experience we have heard
an equal number of people converge on the
benefits of 4130 and T45.
Some users love T45, whereas others love
4130. Some users interchange between the
two with no issue.
For more information on T45
and 4130 Tube, or any of the
other metals we supply, please
visit us at:
Tel: +44 (0) 2476 645 551
email@example.comInd. Estate, Longford
Address: Unit B, Grovelands
Rd, Coventry, CV7 9ND