Square Weld Nuts (DIN 928) – Low Carbon Steel, ISO Class 4, Bare Finish

FULLERKREG DIN 928 square weld nuts in Q195 low carbon steel with bare (plain, uncoated) finish are the standard choice for high-volume resistance projection welding applications where post-weld painting, powder coating, or e-coating will be applied to the finished assembly. The bare finish ensures optimal electrical conductivity during the welding process and maximum adhesion for subsequent surface treatments. Four precision weld projections on the bearing face concentrate heat during resistance welding for consistent, high-strength weld joints. The square body provides excellent anti-rotation resistance in the parent material. Widely used in automotive body-in-white, appliance manufacturing, steel furniture, and general sheet metal fabrication.

Product Specifications

Dimensional Data

All dimensions in millimeters (mm). Weight per 1000 pcs in kg. Unit weight (g/pc) calculated from standard data. Refer to diagram: A = body width across flats, C = body thickness, D = thread diameter, H = projection height, E = projection diameter, F = projection pitch circle diameter.

Note: Dimensional data per DIN 928 standard. Weights based on Q195 low carbon steel density (7.85 g/cm³). Actual weights may vary slightly by batch.

Mechanical Properties – ISO Class 4 / Q195

Why Bare Finish for Weld Nuts?

Bare (uncoated) finish is the industry-standard choice for weld nuts used in assemblies that will receive post-weld surface treatment. Key advantages include:

• Optimal weld conductivity – No coating layer to burn off or contaminate the weld nugget
• Consistent projection collapse – Bare steel projections deform predictably under electrode force
• Paint / powder coat adhesion – Bare steel surface bonds directly with e-coat, powder coat, or wet paint
• Cost efficiency – No plating cost; corrosion protection provided by the final assembly coating
• Automotive BIW standard – Body-in-white processes universally specify bare weld nuts before paint shop

Welding Guide

Selection Guide

Standard Reference

DIN 928 specifies square weld nuts with metric threads and four weld projections, issued by the Deutsches Institut für Normung (DIN). The standard defines body dimensions, projection geometry, and thread tolerances for resistance welding applications. DIN 928 weld nuts in bare low carbon steel are the most widely used variant globally, particularly in automotive, appliance, and general manufacturing industries where post-weld coating is part of the production process. FULLERKREG manufactures these nuts in Q195 low carbon steel with strict conformance to DIN 928 dimensional tolerances.

Product Gallery

DIN 928 Low Carbon Steel Bare Square Weld Nuts – actual product photos

Why Choose FULLERKREG?

🏭 Direct Manufacturer – Factory-direct pricing with full dimensional traceability
📐 DIN Precision – Strict conformance to DIN 928 tolerances, projection geometry verified by QC
⚡ Weld-Ready Projections – 4 precision projections ensure consistent resistance weld quality
🔧 Low Carbon Q195 – Excellent weldability, clean nugget formation, no carbon migration
🎨 Bare Finish – Optimal for post-weld e-coat, powder coat, or paint processes
✅ RoHS Compliant – All products meet EU RoHS environmental directives
📦 Bulk Wholesale Ready – MOQ flexible, available in bags, boxes, or bulk cartons
🌍 Global Shipping – Reliable export logistics to Europe, North America, Southeast Asia
💬 Technical Support – Engineering team available for welding parameters and substitution queries