SQUARE NECK BOLTS

DIN 603 | DIN 604 | DIN 605 | DIN 607 | DIN 608 | DIN 609 

Carriage Bolts | Cup Square Bolts | Plough Bolts | Mushroom Head Square Neck Screws 

Nufast Ltd is a leading UK-based manufacturer and supplier of precision-engineered square neck bolts, also referred to as coach bolts, carriage bolts, and cup square screws. Manufactured to international standards including DIN 603, DIN 604, DIN 605, DIN 607, DIN 608, and DIN 609, our fasteners are trusted across a wide range of industrial and construction applications. 

Engineered with a round or flat head and a precision-formed square neck, these bolts provide an anti-rotation locking mechanism during installation, ensuring high clamping strength and resistance to torsional failure—ideal for timber-to-timber and timber-to-metal connections. The square section beneath the bolt head embeds into the mating material, providing excellent resistance to turning when torque is applied during nut tightening. 

Available Configurations: 

• Round Head Square Neck Bolts (DIN 603) 
• Flat Head Square Neck Bolts (DIN 608) 
• Plough Bolts (DIN 605 / DIN 609) 
• Round Mating Bolts 
• Flat Countersunk Bolts 
• T-Bolts 
• Fully Threaded or Partially Threaded Variants 

Surface Finishes: 

• Bright Zinc Plated (BZP) 
• Self-Colour (Uncoated) 
• Custom Surface Treatments (on request, including hot dip galvanising, Dacromet®, and phosphate coatings) 

To support specific application needs, Nufast also supplies a wide range of compatible washers, nuts, and accessories, enabling one-stop procurement and full assembly support. 

Bespoke Manufacturing & Specialist Fastener Solutions 

Nufast offers custom production services, supporting non-standard sizes, materials, and surface treatments. Our UK-based production facilities and global sourcing capabilities allow us to provide: 

• Small batch runs 
• Modified standard parts 
• Fasteners to technical drawings or 3D models

Why Specify Nufast Square Neck Bolts? 

• Single-Source Supplier of Industrial Fasteners 
• Extensive Stock Range Ready for Immediate Dispatch 
• Express Delivery Across the UK and Internationally 
• Competitive Pricing with No Hidden Costs 
• Technical Support for Custom or Complex Applications 

Request a Quotation or Technical Consultation 

Submit your enquiry via the form below for detailed technical assistance or a fast turnaround quotation. A member of our engineering team will respond promptly to support your project.