Technical Summary of Extension Spring Data Sheet

1. Spring Specifications and Parameters

• Coiling Direction: Left or right coiling options are indicated.
• Material: EN 10270-3-1.4310 stainless steel wire.
• Wire or Rod Surface: Options include drawn, rolled, or metal-cut surfaces.
• Dimensions and Mechanical Properties:
  • Dh: Minimum diameter of bush (mm)
  • De: Outer coil diameter (mm)
  • D: Mean coil diameter (mm)
  • d: Wire diameter (mm)
  • L0: Unstressed spring length (mm)
  • L1: Prestressed spring length (mm)
  • L2: Loaded spring length (mm)
  • Ln: Maximum spring length (mm)
  • Lh: Loop height (mm)
  • Lk: Length of unstressed spring body (mm)
  • n: Number of active coils
  • nt: Total number of coils
  • m: Loop opening width (mm)
• Spring Deflections and Forces:
  • s1: Prestressed spring deflection (mm)
  • s2: Loaded spring deflection (mm)
  • sn: Maximum spring deflection (mm)
  • sh: Excursion (mm)
  • F0: Initial tension force (N)
  • F1: Prestressed spring force (N)
  • F2: Loaded spring force (N)
  • Fn: Maximum spring force (N)
  • R: Spring rate (N/mm)

2. Loop Shape and Position

• Loops can be offset relative to each other by a specified degree in the direction of the right helix.
• Loop shapes are customizable, with options for openings. Loops are normally stocked without openings (m = 0.00), but openings can be cut at extra cost without delay.

3. Production and Quality Standards

• Spring testing is performed according to DIN ISO 2859/1, test level II.
• Tolerances conform to DIN 2097 and wire diameter standards to DIN 2076.
• Production compensation is applied to maintain dimensional accuracy.

4. Application Conditions and Performance

• Stress Cycle Frequency: Specified as n5 (cycles per second or other unit).
• Application Temperature: Maximum operating temperature is indicated (°C).
• Stress Cycle Endurance: Number of cycles to failure (N4) is provided.

5. Pricing and Weight

• Single spring prices range from approximately €0.39 to €2.83 depending on quantity and specifications.
• Weight per spring is provided in grams, with example values around 0.078 g.
• Quantity discounts are available, with price scales for quantities from 1 to 450 pieces.

6. Contact and Manufacturer Information

• Manufacturer: Gutekunst + Co.KG Spring Factories, Carl-Zeiss-Straße 15, D-72555 Metzingen, Germany.
• Contact details include phone, fax, and email for sales and customization inquiries.

Critical Notes and Recommendations

• Ensure selection of correct coiling direction and loop shape for application requirements.
• Verify surface treatment and material grade to match environmental and mechanical demands.
• Consider production tolerances and testing standards to ensure reliability.
• Account for possible additional costs if loop openings are required.