TTS Standards And Tolerance
Tolerance Of Size And Angle Tolerance Of Size And Angle
QBTTS01 Usually(special)
JISG3466( Japan )
GB6728-2002( China )
GB3094-2000( China )

A,Bmm
Under50
±0.5
250
±2.0
Under30
±0.3(ordinary)
±0.2(advanced)
Under100

±0.5£¨±0.25£© 

¡¡
Under100
±1.5
100
±0.8
300
±2.4
30£­50
±0.4(ordinary)
±0.3(advanced)
Above100
±0.8%(±0.5%) 
Above100
±1.5%
150
±1.2
350
±2.8
50£­75
±0.8%(ordinary)
±0.7%(advanced)
200
±1.6
400
±3.2
Above75
±1%(ordinary)
±0.8%(advanced)
Level degree mm
Under100
Under±0.5£¨±0.3£©
Under100
Under±0.5
Under60
±0.4
50-75
±0.8%(ordinary)
±0.5%(advanced)
Above100
Above0.5%£¨0.4%£©
Above100
A,B±0.5%
Above60
0.6%
Above75
±0.9%(ordinary)
±0.6%(advanced)
Contained angle of adjoint level
±1.0°(±0.5°)
±1.5°
Bending degree
1.5mm in total length 1mm in 1 meter is allowed
Total length is Under 0.3%
Each meter is not greater than 2,the total length is not greater than 0.2%
Per meter<=4.0mm ,total length<=0.4%
Angle department
Rs<=2¡«3t
Rs under 3t
carbon streel Rs under 3.5t
t<6
Rs=2t
Low-alloy Rs under 4t
6<=t<=10
Rs<=2.5t
t>10
Rs<=3t
Distortion
1.5%mm in total length 1mm in 1 meter is allowed
no obvious distortion
Under75
<=2.5mm/m
Above75
<=3.0mm/m
wall thickness
in the range of corresponding tolerance standards of the material
Note:(1)QBTTS01 -- TTS enterprise internal standard,cold formed steel hollow sections for general structure
     (2)JISG3466 -- the standard of rectangle type steel tubes that generally constructed and used in Japan
     (3)GB/T6728-2002 -- cold drawn shaped steel tubes
     (4)Other special precision is according to the agreement signed by both sides of supply and demand
     (5)The welded joint usually in the middle of the heterogeneous type tube broadside,please propose in addition
     for special demand
     (6)carbon steel type:Q195¡«Q345,10#¡«45#,and so on; Stainless steel type:SUS304,316,321,titanium alloy,pure
     titanium and so on