Product Info

Hrlical Extension Spring

 

ultraspring Numbered by the "Standard load" which is originally standardized by Accurate Inc. and in consideration of the Japanese standerdization of spring.(JSMA No.8)
Standard load" which is originally standardized by Accurate Inc. and regarding the German standerdization of springs.(DIN2098)

 

 

 

 

 

SPECIFICATION

Material

The material are different by each series and each wire diameter.

Wire diameter Kinds of steel
E series All SUS304WPB
(18-8 stainless steel wire for springs)
DE series Less than Φ0.5mm SUS304WPB
(18-8 stainless steel wire for springs)
Φ0.5mm and greater SWP-B (Music Wire)

 

Load
characteristic


Controlled by 2points of load characteristic.

Allowable load Standerd load
Tolerance ±10% ±10%
E series Defined by 64% of allowable torsional stress given from JIS B2704. Defined by 60% of allowable load.
DE series Defined by stress where 30% of material's tensile strength works. Defined by stress where 20% of material's tensile strenght works.

* Please avoid usage exceeding allowable load.


 

Free Length Generally,free length is a reference value when the load characteristic is specified.

 

Outside
coil diameter


Controlled by outside diameter with the tolerance of JIS class 2.

Tolerance (JIS class 2)
D/d *1 Greater than 4 up to 8 ±1.5% min±0.2mm
Greater than 8 up to 15 ±2.0% min±0.3mm
Greater than 15 up to 22 ±3.0% min±0.5mm

*1 D/d=Spring index,is the ratio of mean coil diameter and wire diameter.

 

Number of
total coils
Generally,number of total coils is a reference value when the load characteristic is specified.

 

Direction of wind

Right hand coil

 

Hooks shape

Both hooks are cross over loop and relative angle of hooks opening is 180deg



 

 

 

* Color of appearance or gloss level may be seen differently by production lots though this is caused by low temperature annealing and does not affect spring characteristics.

* Specifications are subject to change without notice.