We supply these tricky custom 17-7PH springs to our aerospace customer – unlike the other compression and extension 17-7PH springs we supply the same customer, these are C shaped with two .165″ length oval openings. The material thickness was set to .020″ and the outside diameter at .550-.555″. The angle between the ends was the more challenging part, set at 130 +/-5 degrees. The oval openings incorporated a full radius on both sides and the width was limited to .062″ max. A FAIR and material certs were provided with the parts.