Bolts
To connect two flanges with each other, also bolts are necessary.
The quantity 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.
The most used bolts in Petro and chemical industry for ASME B16.5 flanges are Stud Bolts. Stud Bolts are made from a threaded rod and using two nuts. The other available type is the machine bolt that using one nut. On this site only Stud Bolts will be discussed.
Dimensions, dimensional tolerances etc. have been defined in the ASME B16.5 and ASME 18.2.2 standard, materials in different ASTM standards.
On the Stud Bolts page you will find more details concerning materials and dimensions.
Pressure Class: 150 | 300 | 400 | 600 | 900 | 1500 | 2500
| NPS | Diameter of bolts (in) | Length RF | Length RTJ | N° of bolts | NPS | Diameter of bolts (in) | Length RF | Length RTJ | N° of bolts | |
| 1/2 | 1/2 | 55 | - | 4 | 5 | 3/4 | 95 | 110 | 8 | |
| 3/4 | 1/2 | 65 | - | 4 | 6 | 3/4 | 100 | 115 | 8 | |
| 1 | 1/2 | 65 | 75 | 4 | 8 | 3/4 | 110 | 120 | 8 | |
| 1¼ | 1/2 | 70 | 85 | 4 | 10 | 7/8 | 115 | 125 | 12 | |
| 1½ | 1/2 | 70 | 85 | 4 | 12 | 7/8 | 120 | 135 | 12 | |
| 2 | 5/8 | 85 | 95 | 4 | 14 | 1 | 135 | 145 | 12 | |
| 2½ | 5/8 | 90 | 100 | 4 | 16 | 1 | 135 | 145 | 16 | |
| 3 | 5/8 | 90 | 100 | 4 | 18 | 1 1/8 | 145 | 160 | 16 | |
| 3½ | 5/8 | 90 | 100 | 8 | 20 | 1 1/8 | 160 | 170 | 20 | |
| 4 | 5/8 | 90 | 100 | 8 | 24 | 1 1/4 | 170 | 185 | 20 | |
| NPS | Diameter of bolts (in) | Length RF | Length RTJ | N° of bolts | NPS | Diameter of bolts (in) | Length RF | Length RTJ | N° of bolts |
General notes:
- Dimensions are in millimeters unless otherwise indicated.
- The length of the Stud Bolt does not include the height of the chamfers (points).
- Length dimensional tolerances for all Stud Bolts:
length to 12 inch tolerance = ± 1.6 mm
length over 12 inch to 18 inch tolerance = ± 3.2 mm
length over 18 inch tolerance = ± 6.4 mm
1/2*1/4 " hex head reducing bushing 3000lb,NPTASTM A 105N FEMALE GALVANIZED STEEL
TECHNICAL PARAMETER
| size | 1/2*1/4" |
| pressure | #3000 |
| material | ASTM A105N |
| shape | HEX |
| ApplicationFields | petroleumrefining& chemical engineering, nuclear power engeering, aerospace industry special pressure quuipment , coal processing engineering, thermal power plant, |
| processingtechnology | forging |
| quality guarantee period: | 2 years |
| brand | GEE |
| certificate | API ,ISO,BV,ABS |
| origin country | CHINA |
| standard | ASTM B 16.11 |
drawing:
Dimensions- NPS 1/2 to 4 - ASME B16.11
the bushing picture we exported:
ourpackage:
