North Wind’ products of hollow bar includes several grades of austenitic stainless steel as well as duplex stainless steel. Hollow bar standard sizes range from outside diameter 32 to 273 mm (1.26 to 10.75 in).


Tolerances for hollow bar

North Wind's hollow bar is delivered with tolerances according to below. Other tolerances can be offered to special order.

Outside diameter (OD)

+2/-0% but minimum +1/-0 mm (+0.04/-0 in.)
+/-1% (OD 275 mm)

Inside diameter (ID)

+0/-2% but minimum +0/-1 mm (+0/-0.04 in.)


Straightness deviation max. 1.5 mm per 1000 mm (0.059 in. per 3 ft).

Standards and testing of hollow bar

Hollow bar stock standard items are tested according to below.
Certificate status according to EN 10204/3.1B.

Standards and testing

PED 97/23/EC (leak test is deferred to machined component)
EN 10216-5 , EN 10294-2

Intergranular corrosion test acc. to EN ISO 3651-2A in delivery condition
NACE MR 0175*/ISO 15156