Unique Bargains Die Spring 5 Pack TM 20mm OD 55mm Spiral Stamping Medium Load Die Springs, Red

Hole Diameter(Outer Diameter): 20mm/0.79"; Inner Diameter (tolerance +0.5mm): 11mm/0.43"; Free Length: 55mm/2.17" (+/- 2mm)||Max Compression Rate: 32%; Color: Red; Load Type: Medium Load; Material: 65Mn||Rectangular section, closed-end design. Die springs are primarily used in die machinery equipment, for plastic injection 3D printer electric part.||Made of 65Mn material, the surface is red painted, not easy to rust, and more durable.||Package Content: 5pcs x Compression Die Spring