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Types of Threaded Connection
The following are types of threaded connection methods, covering common types, their characteristics, and application scenarios for your check.
| Connection Type | Technical Term | Structural Characteristics | Primary Applications | Advantages & Disadvantages |
|---|---|---|---|---|
| Bolt Connection | Bolt Connection | Bolt passes through clearance hole, secured with nut (removable) | Steel structures, mechanical equipment, flange connections | ✅ High strength, removable ❌ Requires access to both sides |
| Screw Connection | Screw Connection | Screw threads directly into tapped hole (no nut required) | Sheet metal, electronic enclosures, light structures | ✅ Single-side installation, space-saving ❌ Threads may strip with repeated use |
| Stud Connection | Stud Connection | Double-ended threaded stud (one end fixed in base material, other end nutted) | High-temperature/pressure flanges, engine blocks, heavy equipment | ✅ Vibration-resistant, self-aligning ❌ Requires pre-installation |
| Set Screw Connection | Set Screw Connection | Headless screw with tip (cone/flat/cup) that bears against shaft/hole | Shaft-hub positioning, gear retention, precision instruments | ✅ Reliable axial fixation ❌ Limited load capacity |
| Threaded Insert Connection | Threaded Insert Connection | Metal/plastic insert embedded in soft material to reinforce threads | Aluminum alloys, plastic components | ✅ Improves thread durability ❌ Additional cost |
| Pipe Thread Connection | Pipe Thread Connection | Tapered (NPT/BSPT) or parallel (BSPP) threads; seals via thread deformation or sealant | Hydraulic/pneumatic systems, fluid handling equipment | ✅ Inherent sealing ❌ Requires sealant (tape/compound) |
| Eye Bolt Connection | Eye Bolt Connection | Bolt with circular head for lifting | Hoisting equipment, lifting points | ✅ Designed for lifting ❌ Off-center loads may cause tilting |
| Expansion Bolt Connection | Expansion Bolt Connection | Expanding sleeve anchors into base material | Concrete, masonry substrates | ✅ Suitable for brittle materials ❌ Permanent installation |
Additional Notes
Load Classification
- Tension Connection: Axial loading (e.g., tension bolts)
- Shear Connection: Transverse loading (e.g., shear bolts)
Sealing Requirements
- Non-sealing: Standard threads (e.g., bolts/screws)
- Sealing: Leak-proof required (e.g., NPT pipe threads)
Locking Methods
- Spring washers, double-nutting, threadlocker adhesives can be applied to all above connections.
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