RS PRO Pozidriv Countersunk A2 304 Stainless Steel Machine Screws DIN 965, M4x20mm

From RS Pro, a range of superior quality countersunk machine screws with a metric thread. The fully threaded fixings have a countersunk head, when used with a pre-drilled hole provides flush finish. These A2 grade, type 304 stainless steel fixings are available in an array of lengths and thread sizes to suit almost any application.

• Food processing and brewing equipment
• Domestic appliances
• Building fasteners and fixings
• Medical equipment
• Non-salt water marine applications

• A2 grade 18/8 Stainless Steel (Type 304)
• Excellent corrosion resistance
• Strong abrasion resistance
• Environmentally friendly, stainless steel is fully recyclable
• Long life
• Low maintenance
• Easy to clean
• Wide temperature range, can be used up to 800°C

Countersunk machine screws, also known as CSK screws have a flat head design so when placed in a pre-drilled countersunk hole they will sit flush with or below the surface of the surrounding material. These screw heads are ideal for use when you need to cover the heads with a screw cap or create a flat surface for placing objects on or fixing other objects to.

Pozidriv, sometimes shortened to Pozi, stands for “positive drive”. This head type has a cross recess in the centre with four small indentations around it creating 8 points of contact. This design provides improved engagement and contact with the screwdriver and prevents ejection force when tightening or loosening the machine screw.

• Pozidriv head type for improved screwdriver grip
• Countersunk head for a flush finish
• A2 stainless steel for excellent resistance to corrosion and oxidation, strong abrasion resistance, low levels of distortion and the ability to withstand extremes of temperature
• Easily Cleanable
• Meets DIN 965 Standards

Machine screws are designed to hold separate components together in a wide range of applications such as industrial machinery and vehicle engines. They are screwed through pre-drilled tapped holes in 2 components and can be fastened at the rear with a nut. This 304 stainless steel machine screw is ideal for use in the following:

• Food processing and brewing equipment
• Domestic appliances
• Building fasteners and fixings
• Medical equipment
• Non-salt water marine applications

These measurements are found on metric screws, The 'M' stands for Metric. The number after the 'M' is the nominal outer diameter of the screw in mm.

Damage to the machine screw threads can prevent parts from fitting together properly, therefore care has to be taken when cutting them and the correct tools used.

Cutting a small machine screw (up to standard size #10 or metric size M5 (5mm)
Use a pair of multipurpose wire strippers or electricians pliers that feature M2.5, M3, M3.5, M4, M5 threaded holes. These holes are designed for cutting bolts without damaging the thread. Open the jaws and thread the machine screw into the correct size hole to the distance required. Squeeze the tool handles closed and the screw will be cut at the point where the two halves of the jaws come together. You will have a clean cut without any thread damage.

Cutting a large machine screw (larger than size #10 or metric size M5 (5mm)
This is best done using a hacksaw. Thread the nut on the screw until it reaches the desired point on the head side of the cutting line. Place the screw in a vice or clamp to keep it secure when cutting and cut the screw as straight as you can. When you unthread the nut it will repair and realign any threads that may have been damaged by the saw blade.

Please note IMDS is not a regulatory requirement and is currently not supported by RS PRO