Flange Hex Head Bolt from AGICO
AGICO supplies A2 Flanged Hex Head Bolt in 2 types: flat and serrated flange, it can be produced according to GB5787、GB5789, din6921 and ISO 1665 standard. Flange design functions the same as the washer. High torque can be applied to flange hex head bolt using spanner or wrench. Flange Hex Head Screw can be supplied fully threaded or partial threaded, A2(304) material offers excellent corrosion resistance.
Flanged Hex Head Bolt Drawing
Stainless Steel Flanged Hex Head Bolt
| Diameter | Head Diameter | Head Height | Spanner/ Wrench Size | Thread Diameter | Thread Pitch |
|---|---|---|---|---|---|
| M5 | 10.5mm | 5.6mm | 8mm | 5mm | 0.8mm |
| M6 | 14.2mm | 6.6mm | 10mm | 6mm | 1.0mm |
| M8 | 18mm | 8.1mm | 13mm | 8mm | 1.25mm |
| M10 | 22.3mm | 9.2mm | 17mm | 10mm | 1.50mm |
Stainless Steel Serrated Flanged Hex Bolts
| Diameter | Head Diameter | Head Height | Spanner/ Wrench Size | Thread Diameter | Thread Pitch |
|---|---|---|---|---|---|
| M4 | 9mm | 4.2mm | 7mm | 4mm | 0.7mm |
| M5 | 10.5mm | 5.6mm | 8mm | 5mm | 0.8mm |
| M6 | 14.2mm | 6.6mm | 10mm | 6mm | 1.0mm |
| M8 | 18mm | 8.1mm | 13mm | 8mm | 1.25mm |
Flange Screw Fastening Methods and Requirements:
Without Torque Wrench or Impact Wrench
Suitable for general equipment and pipeline flange fastening, selected based on screw size and flange pressure rating. The requirements for flange screw fastening are as follows:
- Maintenance units should develop a fastening plan, perform symmetric fastening on the flange, and label the fastening sequence according to reference figures 1 and 2.
- Use four screws at positions 1, 2, 3, and 4 as washers for positioning, ensuring that the center of the gasket wraps inside the protrusion edge.
- Hand-tighten the positioning screws, then insert and tighten the other stud bolts to balance the load, ensuring that at least two threads are exposed at each end of the nut.
- Based on the on-site equipment and flange, consider one full revolution as one fastening cycle. Develop a reasonable number of fastening cycles (at least 3) and the impact load (intensity) for each fastening cycle. The impact load should gradually increase from small to large (e.g., 50%, 80%, 100%) to prevent excessive loading and ensure gasket sealing effectiveness.
- The sequence for fastening with a torque wrench or impact wrench: a) Tighten two screws that are diametrically opposed to the predetermined impact load (intensity). b) Tighten another pair of screws that are approximately 90 degrees apart from the previous pair along the circumference. c) Continue fastening until all other screws are tightened to the predetermined impact load.
- Finally, fasten all screws in a clockwise or counterclockwise direction at 100% impact load (intensity).
