• Stainless steel = IX
• Standard steel = AC
• Ground (Fig. 1) = M
• Unground (Fig. 2) = NM
• d: wire diameter in mm
• Da:  outer diameter in mm
• L0: free length in mm
• Pn: maximum load under Ln in Newton (N)
• Ln: maximum compression length in mm
• Lbl: block length in mm
• C: Spring rate N/mm

• Stainless steel = IX
• Standard steel = AC
• d: wire diameter in mm
• Da: outside diameter in mm
• L0: free length between loops in mm
• Pn: maximum load under Ln in Newton (N)
• Ln: maximum length under load Pn in mm
• C: Spring rate N/mm

Material : spring steel Cl. D DIN 17223

Spiral lengths 300 mm to be cut

Screw-in hooks

Material : spring steel Cl. D DIN 17223

Spiral lengths 300 mm to be cut

Screw-in hooks