- Self-blocking - Materials: Stainless steel rod 630 hardened 40HRc passivated Grip and push button stainless steel 303, passivated Stainless steel spring stainless steel 440C balls hardened 58HRc and passivated Advantages - Ball lock pins are used for quick and easy fastening and joining of parts and workpieces. - The hardened, high-tensile stainless steel pin permits extreme loads with low wear. Assembly - The drill hole is machined to tolerance H11