Extension springs


Materials
„E” part number
Music wire: ASTM A228 or AMS 5112
Stainless steel / INOX: Type 302 as per ASTM A313 or AMS 5688 spring temper (chemical and physical only)
 
„T” part number
Music wire: DIN 17223, JIS G4314 SWP-A/B or AMS 5112
Stainless steel / INOX: Type 301, 302 or 304 as per DIN 17224 or JIS G4314 SUS 302/304 or AMS 5688 spring temper
 
Tolerances
„E” part number
Outside diameter
1,45 - 3,02 mm
± 0,08 mm
3,05 - 6,10 mm
± 0,13 mm
6,12 - 12,70 mm
± 0,20 mm
12,73 - 25,40 mm
± 0,38 mm
25,43 - 31,12 mm
± 0,51 mm
31,14 - 37,08 mm
± 0,76 mm
37,11 - 50,08 mm
± 1,02 mm
Load P
± 10%
Spring rate R
± 10%
   
 „T” part number
All dimensions and forces to DIN 2097 (Grade 2.)
 
Ends
German style closed loop. End position may vary. Special ends are available on request.

Loads
Initial tension T is for reference only and will vary. To determine the load at any working lenght use the formula:  (P=rate x deflection) + Initial tension
1lb = 4,448 Newton
1 Newton = 0,225 lb

Surface finish
Music wire - oiled
Stainless steel / INOX - plain wire
Shot-peened and plated finishes supplied an request. Allow sufficient additional time for special finishes.