Weld Stud with Internal Thread ISO 13918 IT Technical Datasheet
ISO 13918 IT Capacitor Discharge (CD) Weld Studs are internally threaded fasteners designed to provide a permanent female threaded attachment point on metallic components using the capacitor discharge stud welding process. Featuring an internal metric thread, these studs allow bolts or machine screws to be installed after welding, making them ideal where removable assemblies or maintenance access is required.
The capacitor discharge welding process uses a short-duration, high-current electrical discharge to produce a strong metallurgical bond with minimal heat input, making IT weld studs particularly suitable for thin sheet metal applications where distortion, discoloration, and reverse-side marking must be minimized.
Manufactured in accordance with ISO 13918, IT weld studs are widely used in electrical enclosures, telecommunications equipment, HVAC systems, industrial machinery, commercial appliances, railway equipment, and sheet metal fabrications.
Table of Contents
ITEM CODE: 1066
Standard
ISO 13918 IT
Dimensions
| D6 | l1 min +0.6 | b min +2P | d2 ±0.2 | d1 ±0.1 | d4 ±0.08 | l3 ±0.05 | h1 | α ±2° |
| M3 | 10 | 5 | 6.5 | 5 | 0.75 | 0.8 | 0.7 to 1.4 | 174° |
| M4 | 10 | 6 | 7.5 | 6 | 0.75 | 0.85 | 0.8 to 1.4 | 174° |
| M5 | 10 | 7 | 9 | 7.1 | 0.75 | 0.85 | 0.8 to 1.4 | 174° |
| M5 | 15 | 7.5 | 9 | 8 | 0.75 | 0.85 | 0.8 to 1.4 | 174° |
| M6 | 15 | 9 | 9 | 8 | 0.75 | 0.85 | 0.8 to 1.4 | 174° |
all dimensions in mm
Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.
Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.
Download Technical Datasheets
| Material | Download |
|---|---|
| Steel with Copper Coating and Stainless Steel A2 | ⬇️ Download Datasheet |
Material Characteristics and Recommended Applications
| Material | Characteristics | Typical Applications |
|---|---|---|
| Low Carbon Steel | Economical, high strength | Electrical cabinets, sheet metal fabrication |
| Stainless Steel A2 (304) | Excellent corrosion resistance | Food processing, commercial kitchens, architectural applications |
| Stainless Steel A4 (316) | Superior corrosion resistance | Marine, offshore, chemical processing |
Technical Specifications
| Property | Specification |
|---|---|
| Product Type | Capacitor Discharge Weld Stud with Internal Thread |
| Standard | ISO 13918 IT |
| Welding Process | Capacitor Discharge (CD) Stud Welding |
| Thread Type | Metric Internal Thread |
| Thread Direction | Right-Hand |
| Installation | One-sided welding |
| Base Material | Carbon Steel, Stainless Steel, Aluminium (subject to compatibility) |
| Surface Finish | Plain, Zinc Plated, Nickel Plated (material dependent) |
| Typical Thread Sizes | M3 to M10 (larger sizes on request) |
| Head Style | Cylindrical Body with Internal Thread |
| Weld End | Capacitor Discharge Weld Tip |
| Corrosion Resistance | Material dependent |
Applications
ISO 13918 IT CD Weld Studs are widely used in:
- Electrical Control Panels
- Switchgear
- Telecom Cabinets
- Data Centre Enclosures
- HVAC Equipment
- Medical Equipment
- Food Processing Machinery
- Commercial Refrigeration
- Sheet Metal Enclosures
- Commercial Kitchen Equipment
- Industrial Machinery
- Railway Interiors
- Automotive Components
- Battery Enclosures
- Electronics Manufacturing
Advantages
- Provides a permanent internally threaded fixing point
- Ideal for applications requiring removable bolted assemblies
- Minimal heat input during welding
- Suitable for thin sheet metal
- Low reverse-side marking
- Excellent cosmetic appearance
- No drilling or tapping required
- High production efficiency
- Strong metallurgical bond
- One-sided installation
- Compatible with automated production lines
- Excellent vibration resistance
Installation Best Practices
Do
- Ensure the workpiece surface is clean and free from oil, rust, paint, and coatings.
- Select the correct capacitor discharge welding settings for the stud diameter and material.
- Maintain proper grounding throughout the welding process.
- Verify stud alignment before welding.
- Perform regular weld quality inspections.
Don’t
- Weld through painted or contaminated surfaces.
- Use damaged studs.
- Exceed the recommended sheet thickness limits for CD welding.
- Reuse contaminated chuck components.
- Operate with incorrect capacitor charge settings.
Common Installation Problems & Solutions
| Problem | Possible Cause | Recommended Solution |
|---|---|---|
| Weak weld | Insufficient discharge energy | Increase capacitor charge |
| Stud leaning | Poor gun alignment | Hold welding gun perpendicular |
| Incomplete fusion | Dirty work surface | Clean the base material thoroughly |
| Excessive indentation | Excessive welding energy | Reduce capacitor charge |
| Stud detachment | Poor grounding | Improve grounding connection |
Why Choose Capacitor Discharge Weld Studs?
Compared with conventional arc weld studs, capacitor discharge weld studs offer:
- Lower heat input
- Faster welding cycle
- Better cosmetic finish
- Minimal discoloration
- Reduced distortion
- Excellent for thin gauge sheet metal
- Suitable for visible architectural applications
- Minimal reverse-side witness marks
Why Choose an Internal Thread Weld Stud?
Unlike externally threaded studs, ISO 13918 IT weld studs provide a female threaded connection, allowing standard bolts or machine screws to be installed after welding. This design offers greater flexibility during equipment assembly, simplifies maintenance, and enables components to be removed and reinstalled without disturbing the welded stud.
Typical advantages include:
- Easier equipment servicing
- Reusable threaded connection
- Flush installation with no exposed threads
- Improved protection against thread damage during transportation and handling
- Clean appearance for finished assemblies
Frequently Asked Questions
What is an ISO 13918 IT weld stud?
It is a weld stud with an internal metric thread that is permanently attached using the capacitor discharge stud welding process, allowing bolts or machine screws to be installed after welding.
What is the advantage of an internal thread over an external thread?
Internal thread weld studs provide a protected female thread, making them ideal for removable assemblies, maintenance access, and applications where exposed threads are undesirable.
Can IT weld studs be installed on thin sheet metal?
Yes. Capacitor discharge welding produces minimal heat input, making ISO 13918 IT weld studs suitable for many thin sheet metal applications when proper welding parameters are followed.
Are stainless steel IT weld studs available?
Yes. Standard materials include A2 (304) and A4 (316) stainless steel, along with carbon steel. Other materials may be available on request.
Can these studs be used with standard metric bolts?
Yes. ISO 13918 IT weld studs are designed with metric internal threads compatible with standard metric machine screws and bolts of the corresponding thread size.
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