๐ง 304 Stainless Steel No-Thread Weld Studs M3 M4 M5 M6 Smooth Shank Spot Welding Pins Projection Weld Dowel 6-35mm
These 304 stainless steel no-thread weld studs (also known as threadless welding pins, smooth shank weld studs, or spot welding dowels) are specially designed for metal sheet welding, fixing, and positioning. Made from premium 304 stainless steel with a threadless smooth shank, they are firmly welded onto metal surfaces through capacitor discharge welding, spot welding, or projection welding, forming a permanent anchor point or locating dowel. Available in four nominal diameters from M3 to M6, with lengths ranging from 6 mm to 35 mm (excluding the weld point), they meet the welding and positioning needs of different sheet thicknesses.
โญ Key Features and Benefits of 304 Stainless Steel No-Thread Weld Studs
- ๐ฅ Premium 304 Stainless Steel: Austenitic stainless steel (chromium ≥ 18%, nickel ≥ 8%) offers excellent corrosion and heat resistance with strong anti-rust performance. No discoloration or oxidation after welding, suitable for a wide range of environments.
- ๐งต Threadless Smooth Shank Design: Eliminates the risk of thread stripping and stress concentration. The instantaneous resistance welding fuses the stud with the base metal, forming an integrated one-piece anchor.
- ๐ช Flat Surface After Welding: No steps, no burrs, and no assembly gaps after welding. The shear strength is close to that of the base material itself.
- ๐ง Excellent Weld Fluidity: 304 stainless steel produces less spatter during welding, with a round weld nugget and a narrow heat-affected zone — almost no grinding is needed after welding.
- ๐ Smooth Straight Shank: Provides smoother insertion guidance, and projection welding is completed in an instant — more efficient than traditional riveting.
- ๐ข Multiple Specifications: Nominal diameters M3–M6 combined with 6–35 mm lengths cover common welding positioning requirements.
- ๐ Strong Welding Bond: The dense weld bond surface is free of cold welding defects, creating a solid one-piece metal connection.
๐ Technical Specifications for 304 Stainless Steel No-Thread Weld Studs
| Product Name | No-thread weld studs / Threadless welding pins / Spot welding dowels |
|---|---|
| Material | 304 stainless steel (austenitic stainless steel, chromium ≥ 18%, nickel ≥ 8%) |
| Surface Treatment | No treatment (natural finish) |
| Nominal Diameter | M3, M4, M5, M6 |
| Length Range | 6 mm – 35 mm (excluding the weld point) |
| Thread Type | No thread (smooth straight shank) |
| Measurement Standard | Metric |
| Welding Method | Capacitor discharge welding / spot welding / projection welding / stud welding |
| Packaging | Single or multiple pieces (see options) |
| Application Scope | Sheet metal fabrication, automotive manufacturing, medical equipment, tooling fixtures, aerospace models, building decoration, machinery equipment |
| Important Notice | Please confirm the nominal diameter and length match your installation needs before purchase. Length dimensions exclude the weld point — consider the total height after welding when selecting. |
๐ง Welding Process Guide for No-Thread Weld Studs
โก Capacitor Discharge Welding (ๅจ่ฝ็)
Uses the electrical energy stored in capacitors and discharges it in an instant to produce a pulse current for welding. It features a small heat-affected zone and minimal workpiece deformation, making it ideal for thin sheet welding.
๐ Spot Welding
The workpieces are assembled in an overlap and pressed between two electrodes. Resistance heat melts the metal to form a weld point at the contact area.
๐ฅ Projection Welding
The stud end contacts the workpiece, current ignites an arc to heat and melt the connecting surface, and pressure is applied after the power is switched off to complete the weld.
๐ Stud Welding
The weld stud is welded and fixed onto the metal sheet surface, forming a positioning or anchoring point for subsequent assembly.
๐ ๏ธ Installation Instructions for No-Thread Weld Studs
๐ Step-by-Step Installation
1. Clean the metal sheet surface to remove oil and oxides. 2. Place the threadless weld stud at the desired welding position. 3. Use a capacitor discharge welder or spot welder and adjust the appropriate current and pressure. 4. Energize and weld, making sure the weld point is secure. 5. After welding, inspect the weld appearance and remove any welding spatter.
โ ๏ธ Precautions for 304 Stainless Steel Weld Studs
๐ Important Notes Before Use
1. When welding stainless steel, use a greater electrode pressure than for low carbon steel due to its higher strength at elevated temperatures. 2. Adjust the welding current and energizing time according to the sheet thickness and stud size. 3. Control the heat input when welding 304 stainless steel to prevent intergranular corrosion. 4. Confirm the nominal diameter and length match your installation requirements before purchase. 5. The length dimension excludes the weld point — take the total height after welding into account during selection.
โ Frequently Asked Questions about 304 Stainless Steel No-Thread Weld Studs
๐ฉ Why choose a no-thread design instead of threaded weld studs?
The threadless smooth shank design avoids the risks of thread stripping and stress concentration found with threaded studs. It is fused with the base metal through instantaneous resistance welding to form an integrated anchor with a flat surface, no burrs, and shear strength close to that of the base material.
๐ What sizes are available?
These weld studs are available in four nominal diameters — M3, M4, M5, and M6 — with lengths ranging from 6 mm to 35 mm (excluding the weld point). Please select the size that matches your sheet thickness and positioning requirements.
๐ง๏ธ Are the 304 stainless steel weld studs corrosion resistant?
Yes. Made of premium 304 austenitic stainless steel (chromium ≥ 18%, nickel ≥ 8%), they offer strong corrosion and heat resistance, remain discoloration-free and oxidation-free after welding, and are suitable for a wide range of environments.
โก Which welding methods are supported?
These studs support capacitor discharge welding, spot welding, projection welding, and stud welding. The capacitor discharge method is especially recommended for thin sheets thanks to its small heat-affected zone and minimal deformation.
๐ญ Where can the no-thread weld studs be used?
They are widely used for locating pins and anchor points in sheet metal fabrication, automotive bodies, medical equipment housings, automated production line tooling, aerospace models, building decoration, and machinery equipment — anywhere requiring strong, compact welding positioning.
๐ Does the length include the weld point?
No. The length dimension excludes the weld point. Please take the total height after welding into account when selecting the appropriate size for your application.
๐ Why Choose Our 304 Stainless Steel No-Thread Weld Studs?
Our 304 stainless steel no-thread weld studs (M3–M6, 6–35 mm length) combine premium 304 stainless steel with a threadless smooth shank design, making them ideal for applications that require strong, compact, and reliable welding anchors or locating pins on metal sheets. Their excellent corrosion resistance, flat post-weld surface, and dense metallurgical bond ensure stable performance in diverse environments, while the wide range of diameters and lengths covers common fabrication, automotive, medical, and tooling needs. The smooth shank enables instant projection welding and more efficient production than traditional riveting. Please confirm the nominal diameter and length before purchasing, and remember that the length excludes the weld point. Trust in precision and durability to support your welding and positioning applications.
