high precise dimension,high efficiency of exchanging heat,high clean surface in both inside and outside ,low density.applied to

item	(mm)Tolerances	size(mm)
(mm)spec		5*0.25	7*0.31	7*0.32	7.94*0.32	9.52*0.32	9.52*0.31	9.52*0.36
W.T	±0.05	5.00	7.00	7.00	7.94	9.52	9.52	9.52
thickness		0.27	0.32	0.32	0.32	0.32	0.31	0.36
I.D		4.30	6.30	6.14	7.08	8.66	8.72	8.52
B.T	±0.03	0.20	0.25	0.25	0.25	0.27	0.28	0.30
F.D	±0.02	0.15	0.10	0.18	0.18	0.16	0.12	0.20
apex.angle	±10°	40.00	40.00	40.00	40.00	40.00	40.00	40.00
Helix angle	±2°	18.00	18.00	18.00	18.00	18.00	18.00	18.00
number of tooth	0	40.00	50.00	50.00	60.00	60.00	60.00	60.00
unit weight	±2	35.50	52.00	57.00	66.00	82.00	80.00	95.00
other sizes can be made as per customer's request according to mutual agreement.

inner groove copper tube