Spring contact Tip diameter: 0.65 mm Housing Material: Brass (CuZn) / Gold-Plated Piston: Steel, Nickel-Plated Pitch: 2.54 mm Series: PTR 2028 Sleeve: Bronze, Gold-Plated Spring: Spring Steel, Gold-Plated Tip style: Round Head Lift max.: 5.3 mm Overall length: 32.3 mm Plunger Diameter: 1.3 mm Pre-loaded spring force: 0.75 N Spring force at working travel: 2.25 N