TECHNICAL SPECIFICATION: Standard Pitch, 18/8 Cold-rolled Grade AISI-304 Austenitic Stainless Steel Wire (Non-Magnetic), Resistant to temperature fluctuations between -320˚F to 800˚F, Tensile Strength +200,000 psi, HRc 43-50. The PRECOIL Spring type Standard pitch thread repair inserts are used in various low strength materials to improve the wear resistance of bolt connections and avoid the damage of thread. The locking type spring wire screw sleeve of the PRECOIL Helicoil thread insert can lock the screw into the threaded hole, so that the screw is not loose when subjected to shock vibration. Because of the Standard pitch spring type feature of the Helicoil thread repair insert, the load on the thread is more even, eliminate the fastener and screw hole deviation between the pitch and tooth type, and can absorb vibration, thus increasing the fastener thread connection strength and resistance to fatigue strength. The hardness of the Spring type Standard pitch threade helicoil inserts is higher and can be used repeatedly. If your are looking for quality thread repair inserts, just log-on to our website - www.samsindusneeds.com, and order now. HSN CODE: 73181110