SNSP-M8-20 NBK Socket Head Cap Screw - Phosphor Bronze Made in JapanSNSP M8 20 NBK Socket Head Cap Screw Phosphor Bronze Made in Japan One Screw Characteristics: Non Magnetic. Excellent fatigue resistance, corrosion resistance, and abrasion resistance. Application: FPD production equipment, semiconductor devices, and electrical and electronic equipment Physical property: Specific Gravity: 8. 83 Longitudinal Elastic Modulus(GPa): 105 Linear expansion coefficient (K 1): 18x10 Thermal Conductivity ( w (m. k) ): 67