Hex Head Bolt Koelner DIN 933 M5×20mm A2 stainless steel full thread, pack of 6

Koelner hex head bolt DIN 933 M5×20 mm in A2 stainless steel is a fully threaded fastening element supplied in a pack of 6. Conforming to the DIN 933 standard, this bolt features a metric M5 diameter and 20 mm length, with a full thread along the shank and a hexagonal head designed for wrench or socket tightening. A2 stainless steel provides general corrosion resistance suitable for both indoor and sheltered outdoor applications. The bolt is intended for assembly, repair and mounting tasks across metal, wood and machine components where a reliable, standard metric fastener is required.

Advantages

The full thread along the shank allows secure clamping and fine adjustment of the joined parts, while the hex head enables straightforward tightening with common tools such as spanners or sockets. A2 stainless steel offers moderate corrosion resistance without additional coating, reducing the need for maintenance in typical environments. Supplied as a pack of six, this product provides multiple fasteners for small projects or repairs and ensures consistent dimensions and fit where DIN 933 compatibility is required.

Suitable for

• General mechanical assembly and repair work
• Fastening metal sheets, brackets and frames
• Wood-to-metal connections and light carpentry
• Mounting small machines, equipment and fixtures
• DIY projects and maintenance tasks

Key specifications

• Standard: DIN 933
• Thread: full thread, metric
• Nominal diameter: M5
• Length: 20 mm (shank length from under head)
• Material: A2 stainless steel (austenitic, corrosion resistant)
• Head type: hexagonal head for wrench or socket
• Pack quantity: 6 pieces

How to use

Select an appropriate nut or tapped hole with matching M5 thread. Position the bolt through the assembled parts so the head bears against the outer surface; engage the mating thread and tighten using a suitable spanner or socket until the required clamping force is achieved. For through-bolted joints, use a matching M5 nut and, if needed, a washer to distribute load. Avoid over-tightening which could damage threads or connected materials; follow torque recommendations for M5 fasteners when a specified preload is required.

Usage recommendations

Use A2 stainless steel fasteners for indoor and sheltered outdoor environments; for prolonged exposure to marine or highly corrosive conditions consider higher-grade stainless steel or additional protective coatings. Store bolts in a dry place and inspect threads for debris or damage before installation to ensure reliable fastening performance.