SMD Nut Specifications Complete Guide: Selection Essentials
In SMT surface mount technology, SMD Nut (also known as Surface Mount Nut) is a critical fastener for PCB board fixation. Selecting the correct SMD nut specifications directly impacts product assembly efficiency and reliability. This article provides a comprehensive guide to SMD nut specifications to help you select the right model.
1. SMD Nut Types
| Type | Features | Typical Application |
|---|---|---|
| Hex SMD Nut | Easy to tighten with wrench | General PCB mounting |
| Square SMD Nut | Space-saving | High-density PCBs |
| Round SMD Nut | Smooth, no sharp edges | Consumer electronics |
| Custom SMD Nut | Special purpose | Custom requirements |
2. Thread Specifications
| Thread | Screw Diameter | Board Thickness | Application |
|---|---|---|---|
| M1.4 | 1.4mm | 0.8-1.0mm | Smartphones, TWS earbuds |
| M1.6 | 1.6mm | 1.0-1.2mm | Wearables, compact PCBs |
| M2.0 | 2.0mm | 1.2-1.6mm | Industrial boards, charging modules |
| M2.5 | 2.5mm | 1.5-2.0mm | Power boards, automotive |
| M3.0 | 3.0mm | 2.0-2.5mm | Large PCBs,支架固定 |
3. Material Options
| Material | Advantages | Disadvantages | Recommended |
|---|---|---|---|
| Copper (Cu) | High conductivity | Higher cost | Grounding applications |
| Brass (CuZn) | Easy加工,耐腐蚀 | Non-magnetic | Most applications |
| Stainless Steel | Rust-proof,耐高温 | Hard to加工 | Automotive, outdoor |
| Carbon Steel | High strength, low cost | Prone to rust | Indoor equipment |
4. Dimension Specifications
| Specification | Outer Diameter(mm) | Inner Diameter(mm) | Height(mm) |
|---|---|---|---|
| M1.4 | 2.8-3.0 | 1.5-1.6 | 1.0-1.5 |
| M1.6 | 3.2-3.5 | 1.7-1.8 | 1.2-1.8 |
| M2.0 | 4.0-4.5 | 2.2-2.3 | 1.5-2.0 |
| M2.5 | 5.0-5.5 | 2.7-2.8 | 1.8-2.5 |
| M3.0 | 6.0-6.5 | 3.2-3.3 | 2.0-3.0 |
5. Surface Treatment
- Plain Copper: Low cost, for general environment
- Tin Plating: Anti-oxidation, good solderability (Most common)
- Nickel Plating: High temperature & corrosion resistant, for automotive
- Gold Plating: Premium, for aerospace & military
6. Selection Guide
| Application | Thread | Material | Surface Treatment |
|---|---|---|---|
| Smartphones/Tablets | M1.4-M1.6 | Brass | Tin/Gold |
| TWS Earbuds | M1.4 | Brass/SS | Tin |
| Smart Home | M1.6-M2.0 | Brass | Tin |
| Industrial Power | M2.0-M2.5 | Brass/SS | Nickel |
| Automotive | M2.0-M3.0 | Stainless Steel | Nickel |
| Charging Stations | M2.5-M3.0 | Stainless Steel | Nickel |
7. Hongchuan Precision SMD Nut Specifications
Hongchuan Precision - 12 years in PCB hardware, offers full range SMD nuts:
- Thread: M1.4 / M1.6 / M2.0 / M2.5 / M3.0
- Material: Brass, Stainless Steel, Carbon Steel
- Surface: Plain, Tin, Nickel, Gold
- Shape: Hex, Square, Round, Custom
- Stock: Common specifications in stock
Contact us for detailed specifications: View Products
📞 Contact Us for Free Samples and Specifications
Phone: 18938685515 | Website | Product Catalog
Hongchuan Precision | No.319, Yulong Road, Chang'an Town, Dongguan | 12 Years PCB Hardware Expert