Disc Spring, Poly Wave Compression, 17-7 PH Stainless Steel, Thickness 0.010 In, Overall Height 0.180 In, For Hole Size 5/8 In, For Rod Size 1/4 In, Load 6 Lbs, Deflection @ Load 0.125 In, Spring Rate 48 Lbs/In, Meets/Exceeds AISI Type 17-7 PH