🔧 304 Stainless Steel / Copper Plated Weld Nut Stud, Internal Thread Spot & Capacitor Discharge Weld Stud, M3-M8, Length 4-30mm, Multiple Sizes Available
304 stainless steel internally threaded weld nut studs (also known as spot weld studs, capacitor discharge weld studs, stud weld studs) are specially designed for welding and fixing onto metal sheets. Made of premium 304 stainless steel, they can be permanently bonded to metal surfaces via capacitor discharge welding, spot welding or stud welding to form durable internal thread connection points. Five metric thread sizes M3, M4, M5, M6, M8 are available with lengths ranging from 4mm to 30mm to meet welding requirements for different sheet thicknesses. You can choose natural 304 stainless steel finish or copper-plated surface treatment. Multiple package options including 5/10/20/50 pieces are provided for selection.
⭐ Main Features & Advantages of 304 Stainless Steel / Copper Plated Weld Nut Stud
- 🎯 304 Stainless Steel Material: Austenitic stainless steel with Cr ≥18%, Ni ≥8%, excellent corrosion resistance and heat resistance, good anti-rust performance, no discoloration or oxidation after welding.
- ⛓️ Internal Thread Design: Forms permanent internal thread connection points after welding for subsequent bolt fastening, can be repeatedly assembled and disassembled without thread stripping.
- 💪 Multiple Welding Options: Compatible with capacitor discharge welding, spot welding and stud welding to match different production equipment.
- 📏 Wide Size Selection: M3-M8 thread specifications and 4-30mm lengths to cover most common application demands.
- 🛠️ Reliable Welding Strength: Full cross-section welded joint, metallurgical bonding at welding points provides high connection strength and prevents falling off.
- 🌧️ Low Heat Impact: Capacitor discharge welding finishes in less than 20ms, greatly reducing workpiece deformation and discoloration.
- 🔩 Precise Thread: Clear burr-free thread with high concentricity for smooth assembly.
- 📦 Various Package Specifications: Available in packs of 5/10/20/50 pieces to satisfy different usage requirements.
📊 Technical Specifications for 304 Stainless Steel / Copper Plated Weld Nut Stud
| Product Name | Weld Nut Stud / Internal Thread Spot Weld Stud |
|---|---|
| Material | 304 Austenitic Stainless Steel (Cr ≥18%, Ni ≥8%) |
| Surface Treatment | Natural Finish (No Treatment) / Copper Plated (Optional) |
| Thread Size | M3, M4, M5, M6, M8 |
| Thread Type | Internal Thread (Female Thread) |
| Length Range | 4mm to 30mm (multiple sizes available) |
| Measurement Standard | Metric |
| Welding Method | Capacitor Discharge Welding / Spot Welding / Stud Welding |
| Package | 5pcs / pack, 10pcs / pack, 20pcs / pack, 50pcs / pack (Optional) |
| Key Properties | Rust-proof, high connection strength, low thermal deformation, precise thread, durable |
📌 Recommended Sheet Thickness for Each Thread Size
| Thread Size | Recommended Welding Sheet Thickness | Typical Applications |
|---|---|---|
| M3 | 0.8-1.5mm | Thin sheets, small enclosures |
| M4 | 1.0-2.0mm | Standard cabinets, electrical housings |
| M5 | 1.2-2.5mm | Heavy-duty cabinets, mechanical equipment |
| M6 | 1.5-3.0mm | Large equipment, automotive sheet metal |
| M8 | 2.0-4.0mm | Heavy structures, construction hardware |
🏭 Application Scenarios
- Sheet metal processing: Thread connection points for chassis, control cabinets and electrical housings
- Automotive manufacturing: Welded studs for body panels, cabs and carriages
- Hardware products: Threaded connections for furniture hardware and construction hardware
- Machinery equipment: Mounting points for equipment housings, protective covers and sensor brackets
- Architectural decoration: Connections for curtain walls, railings and metal components
- Electronic cabinets: Internal threaded mounting points for server cabinets, communication cabinets and distribution boxes
❓ Frequently Asked Questions about 304 Stainless Steel / Copper Plated Weld Nut Stud
🔍 What welding methods are supported?
This weld nut stud supports capacitor discharge welding, spot welding and stud welding. Capacitor discharge welding delivers ultra-short welding time under 20ms with minimal heat affected zone, which is ideal for thin sheet welding.
🌧️ Can 304 stainless steel studs work in humid environments?
Yes. 304 austenitic stainless steel offers good corrosion and rust resistance, suitable for indoor and outdoor humid environments, but proper welding procedures are required to avoid intergranular corrosion.
📏 What sizes and surface finishes are available?
Thread options: M3, M4, M5, M6, M8; Length range: 4mm–30mm; Surface: natural stainless steel or copper plated. Pack options: 5/10/20/50pcs. Please confirm specifications before purchase.
🔧 Installation Steps
1. Clean oil and oxide on metal sheet before welding; 2. Place the weld stud at target position; 3. Adjust current and pressure for capacitor discharge welder or spot welder; 4. Complete welding; 5. Inspect thread and remove welding spatter.
⚠️ Important Welding Notes
Higher electrode pressure is needed for stainless steel compared with mild steel. Adjust welding current and time according to sheet thickness and stud size. Clean weld slag inside threads with tap after welding. Control heat input to prevent intergranular corrosion of 304 stainless steel.
💎 Why Choose Our 304 Stainless Steel / Copper Plated Weld Nut Stud?
Our 304 stainless steel / copper plated internal thread weld nut studs (M3-M8, 4-30mm) are precision manufactured for sheet metal welding assembly. The 304 austenitic stainless steel material provides reliable rust and corrosion resistance, with optional copper plating to meet different process requirements. Multiple compatible welding processes ensure strong full-section metallurgical bonding while reducing thermal deformation. A complete range of metric sizes and flexible packaging options cover light to heavy fastening needs for automotive, electronics, machinery and construction industries. Please verify thread specification, length and surface finish before ordering to achieve perfect installation and stable long-term connection performance.
Am 21.08.2026 hat der Verkäufer die folgenden Angaben hinzugefügt: