Extension springs
Do = Outside diameter
d = Wire diameter
d = Wire diameter
L0 = Free lenght (ref use only inside hook)
L1 = Max. extended lenght
P = Load at L1
T = Initial tension
R = Spring rate
Parameter filtering
Do (mm): 1.60 - 55.00
d (mm): 0.18 - 5.26
L0 (mm): 6.35 - 377.00
R (N/mm): 0.02 - 79.50
Material:
SPEC extension springs have a wide application for experimental, development, prototype and maintenance work and have been specified and designed to high precision standards. All SPEC extension spring have uniform body diameter and are produced with full twist loops the same diameter as the body. They are wound with initial tension, therefor some force is required before the coils are initially separated.
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)
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
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.)
All dimensions and forces to DIN 2097 (Grade 2.)
Ends
German style closed loop. End position may vary. Special ends are available on request.
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
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.