1. Materials: 45 # high-quality carbon structural steel.
2. Specifications: D14mm-40mm.
3. Use: apply to HRB335, HRB400 reinforced the connection.
4. Performance: with the "reinforced mechanical connection technology common point of order" JGJ107-2004I-level joint performance requirements.
5. Model: ordinary-type, forward-and-back forward-thread type and calibre-changed type,
6. Screw thread parameter:

• Basic thread form (75°or 60°)
• 16-22   thread pitch (mm) 2.5
• 25-40     thread pitch (mm) 3.0