Counter nut 310, IT, Rp 3, black malleable cast iron - Riegler 113159

Counter nut 310, IT, Rp 3, Operating temperature -20°C to 300°C, black malleable cast iron, Hot-dip galvanised, DIN EN 10242 Acc. to DIN EN 10242 (formerly DIN 2950) The classic - and the most popular - screw fitting series for pipe construction. These fittings are characterized by their high mechanical strength and surface quality to DIN 2444. They are completely coated with a layer of pure zinc and are therefore suitable for drinking water

Technical data

Standards and origin

• Standard thread: ISO 7-1
• Customs tariff number: 73071910
• Country of origin: CN

About Lock nut

Counter nuts lock a screwed component in position by being tightened against the socket or the wall. Without one, a pipe section set to length turns out of alignment the next time the joint is pulled up. The group holds 9 sizes with female threads to ISO 7-1, from Rp 1/4 to Rp 3.

What matters when choosing

• Thread: Rp 1/4, Rp 3/8, Rp 1/2, Rp 3/4, Rp 1, Rp 1 1/2, Rp 2, Rp 2 1/2 or Rp 3 as female threads. The nut is selected to match the thread of the part being locked.
• Thread standard: ISO 7-1. The parallel female thread fits the taper male R thread of fittings and pipe nipples from the same series.
• Material: black malleable cast iron B350-10 design symbol A, stated for an operating temperature range from -20 °C to 300 °C. The nut therefore holds its tightening torque in warm lines too.
• Surface: hot dip galvanised. When combining with plain parts, keep the surface finish consistent so the pairing does not seize.

Typical applications

• Locking pipe nipples and barrel nipples in threaded pipework
• Fixing valves and instruments in the required reading direction
• Wall penetrations where a fitting is clamped from both sides
• Compressed air and heating installations with pipe sections cut to size
• Maintenance work where a released joint is realigned

The range follows DIN EN 10242, formerly DIN 2950, with surface quality to DIN 2444. All 9 items are made of black malleable cast iron B350-10 and produced in China.