Self-Locking Installation
The square neck prevents spinning, allowing quick assembly with only one wrench on the nut side.
DIN 608 Flat Countersunk Square Neck Bolts with Short Square
- Standard: DIN 608
- Material: SUS304, SUS316, SUS410, Carbon Steel
- Thread Size: M10/M12
- Surface Treatment: Plain, Zinc Plated, HDG, Dacromet, Ruspert
- Min Order: 5000pcs
- Sample: Free sample (after quote)
- Delivery time: 30 – 45 Days
Product Overview
Product Application
DIN 608 is a type of specialised fastener, denoting flat countersunk square-neck bolts with a short square neck; within the industry, these are commonly referred to as ‘plough bolts’ or ‘countersunk carriage bolts’. It combines the features of a carriage bolt (DIN 603) with those of a countersunk bolt (DIN 7991), offering both the smooth outer surface of a countersunk head and the anti-rotation design of a square neck.
DIN 608 Flat Countersunk Square Neck Bolts are specially designed for applications requiring a flush surface while preventing bolt rotation during installation. Unlike conventional countersunk bolts, DIN 608 features a 90° flat countersunk head combined with a short square neck beneath the head. When inserted into a square hole or wood, the square neck locks into the material, allowing tightening from the nut side without holding the bolt head.
Draw
Specification
DIN 608 is a partially threaded bolt (with a smooth shank). Its nominal length is measured from the lower edge of the square neck (i.e., the surface of the workpiece) to the end of the bolt, excluding the height of the head’s crown.
Core Differences Between DIN 608 and DIN 603
Both DIN 608 and DIN 603 feature a square neck anti-rotation design, but their main differences lie in the head shape and square neck height, which determine their different application fields.
Head Design: Countersunk Head vs. Mushroom Head
- DIN 608: 90° Flat Countersunk Head
Requires a countersunk hole. After installation, the bolt head sits completely flush with the workpiece surface, leaving no protrusion. - DIN 603: Round Mushroom Head
Does not require a countersunk hole. After installation, the rounded head remains above the surface.
Square Neck Design: Short Neck vs. Standard Neck
- DIN 608: Short Square Neck
Designed for thin steel plates and wear-resistant components, ensuring proper nut engagement and secure tightening. - DIN 603: Standard Square Neck
Features a deeper square neck that provides stronger anti-rotation performance in wood and thicker materials.
Application Focus: Wear Resistance vs. Safety Protection
- DIN 608
Mainly used for wear plates, construction machinery, conveyors, and equipment requiring a smooth surface with minimal interference. - DIN 603
Commonly used in wooden structures, fences, outdoor facilities, and solar mounting applications where safety, appearance, and anti-tampering features are important.
Product Advantages
Smooth Surface Finish
The countersunk head remains flush after installation, reducing snagging risks while improving equipment appearance.
Stable & Durable Connection
Provides dependable clamping performance for timber, machinery, transport equipment, and structural assemblies.
Common Questions
What is a DIN 608 bolt used for?
Flush, anti-rotation fastening in timber and structural assemblies.
Why does DIN 608 have a square neck?
To prevent bolt rotation during tightening.
What makes DIN 608 different from DIN 603?
DIN 608 has a flat countersunk head, while DIN 603 uses a domed round head.
Can DIN 608 screws be customized?
Yes. Custom sizes, materials, coatings, and packaging are available.
