KS TOOLS 419-Piece O-Ring Assortment Kit, NBR 70 Shore A, Inner Ø 3-50 mm, 32 Sizes, DIN 3771, in Plastic Case 970.0130

In a busy automotive workshop, a technician reaches for the KS TOOLS 419-piece O-ring assortment to quickly replace a worn seal on a hydraulic cylinder. This comprehensive kit covers inner diameters from 3 mm to 50 mm across 32 different sizes, ensuring the right fit for most common sealing tasks. Made from NBR (nitrile butadiene rubber) with a hardness of 70 Shore A, these O-rings provide reliable performance in oils, greases, fuels, and water, and withstand temperatures from -30 °C to +100 °C. The set conforms to DIN 3771 and comes neatly organized in a durable plastic storage case, making it easy to find the exact size you need.

Key specifications

• Total pieces: 419 O-rings
• Number of sizes: 32 different dimensions
• Inner diameter range: 3 mm to 50 mm
• Cross section diameter range: 1.5 mm to 3.5 mm
• Material: NBR (nitrile butadiene rubber)
• Hardness: 70 Shore A
• Temperature resistance: -30 °C to +100 °C
• Chemical resistance: oils, greases, fuels, water
• Standard: DIN 3771
• Colour: black
• Storage case: plastic, included

Why choose it

This O-ring assortment eliminates downtime by providing a wide range of sizes in one organized case. The high-quality NBR material ensures long-lasting seals in demanding environments, while the DIN 3771 compliance guarantees consistent dimensions. Whether you are working on engines, pumps, or plumbing systems, you will have the right O-ring at hand.

Ideal use cases

• Automotive repair and maintenance
• Hydraulic and pneumatic systems
• Industrial machinery sealing
• Plumbing and pipe fittings
• General workshop and DIY projects

Good to know

The set includes a sturdy plastic case with compartments for each size, allowing for quick identification and restocking. NBR O-rings are not recommended for use with strong acids, ketones, or ozone. For best results, store the case in a cool, dry place away from direct sunlight.