| Home>Bearing knowledge>Development and Reform Commission agrees to six bearing specifications |
The NDRC agreed to six bearing specifications
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1.
Specification number: JB/T 2974 2004
Specification Title: Supplementary Provisions for the Rolling Bearing Code Method Alternative Specification Number: JB/T 2974 1993
2.
Specification number: JB/T 3016 2004
Specification title: Rolling bearing box skill condition replacement specification number: JB/T 3016 1991 JB/T 3017 1991
3.
Specification number: JB/T 4036 2004
Specification title: Rolling bearing transport tray and large wooden box replacement specification number: JB/T 4036 1993
4.
Specification number: JB/T 6637 2004
Specification Title: Rolling Bearing Normalizer Skill Condition Replacement Specification Number: JB/T 6637 1993
5.
Specification number: JB/T 6639 2004
Specification title: Rolling bearing parts skeleton type nitrile rubber seal ring skill condition replacement specification number: JB/T 6639 1993
6.
Specification number: JB/T 6642 2004
Specification: Rolling bearing parts roundness and waviness error measurement and identification method Replacement specification number: JB/T 6642 1993
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In Petro and chemical industry for flange connections Stud Bolts and Hex Bolts are used
The quantity of bolts for a flange connection will be given by the number of bolt holes in a flange, diameter and length of bolts is dependent of flange type and Pressure Class of flange.
Stud Bolt length are defined in Asme B16.5 standard. The length in inches is equal to the effective thread length measured parallel to the axis, from the first to the first thread without the chamfers (points). First thread is defined as the intersection of the major diameter of the thread with the base of the point.
1) Standards: Based on DIN & ANSI & JIS & IFI
and per drwing
2) Material: carbon steel, alloy steel, stainless steel
3) bolt Size: M4-M42,3/8"--7/8"
4) bolt Surface: Plain,Zinc ,HDG,DAC,Geomet
5) bolt Thread: UNC, UNF, Metric Thread
6) bolt Quality control : ISO 9001
7) bolt Package : Small box ,Poly Bag,Carton+Pallet
Grades of Stud Bolts
Below a table with materials and grades for flanges, thread rods (bolts) and nuts, arranged on design temperature, flanges, thread rods and recommended nuts.
|
DESIGN |
FLANGES |
GRADE |
GRADE |
|
TEMP. |
THREAD RODS |
NUTS |
|
|
-195° to 102°C |
ASTM A182 |
A320 Gr.B8 Class2 |
A194 Gr.8A |
|
Gr. F304, F304L, F316, |
|||
|
F316L, F321, F347 |
|||
|
-101° to -47°C |
ASTM A350 |
A320 Gr.L7 |
A194 Gr.7 |
|
Gr.LF3 |
|||
|
-46° to -30°C |
ASTM A350 |
A320 Gr.L7 |
A194 Gr.7 |
|
Gr.LF2 |
|||
|
-29° to 427°C |
ASTM A105 |
A193 Gr.B7 |
A194 Gr.2H |
|
428° to 537°C |
ASTM A182 |
A193 Gr.B16 |
A194 Gr.2H |
|
Gr.F11, F22 |
|||
|
538° to 648°C |
ASTM A182 |
A193 Gr.B8 Class1 |
A194 Gr.8A |
|
Gr.F11, F22 |
|||
|
649° to 815°C |
ASTM A182 |
A193 Gr.B8 Class1 |
A194 Gr.8A |
|
Gr. F304H, F316H |
|||
|
DESIGN |
FLG'S |
GRADE |
GRADE |
|
TEMP. |
THREAD RODS |
NUTS |
Should any inquiry related to stud bolts and nuts , please don`t hesitate to contact us .
Price for stud bolts and nuts are available .
Stud Bolt
Stud Bolt,Directly Stud Bolt,Fasteners Stud Bolt, Grade B7 Stud, 2H Heavy Hex Nut, ASTM A193 Stud Bolt, A193 GR b7 Stud Bolt
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