Extension Springs Stainless Steel

Part Number	CAD	D0 (mm)	d (mm)	L0 (mm)	L1 (mm)	P (N)	T (N)	R (N/mm)	Qty
E00630070250S		1.60	0.18	6.35	13.72	1.18	0.11	0.15	Add
E00630070310S		1.60	0.18	7.87	18.54	1.18	0.11	0.10	Add
E00630070380S		1.60	0.18	9.65	23.62	1.18	0.11	0.07	Add
E00630070440S		1.60	0.18	11.18	28.45	1.18	0.11	0.06	Add
E00630070500S		1.60	0.18	12.70	33.27	1.18	0.11	0.06	Add
E00630080250S		1.60	0.20	6.35	11.68	1.67	0.15	0.29	Add
E00630080310S		1.60	0.20	7.87	15.24	1.67	0.15	0.20	Add
E00630080380S		1.60	0.20	9.65	19.05	1.67	0.15	0.16	Add
E00630080440S		1.60	0.20	11.18	23.11	1.67	0.15	0.13	Add
E00630080500S		1.60	0.20	12.70	26.67	1.67	0.15	0.10	Add
E00630080620S		1.60	0.20	15.75	34.04	1.67	0.15	0.09	Add
E00630080750S		1.60	0.20	19.05	41.66	1.67	0.15	0.07	Add
E00630090250S		1.60	0.23	6.35	10.16	2.30	0.22	0.54	Add
E00630090310S		1.60	0.23	7.87	13.21	2.30	0.22	0.39	Add
E00630090380S		1.60	0.23	9.65	16.51	2.30	0.22	0.31	Add
E00630090440S		1.60	0.23	11.18	19.56	2.30	0.22	0.25	Add
E00630090500S		1.60	0.23	12.70	22.86	2.30	0.22	0.20	Add
E00630090620S		1.60	0.23	15.75	28.70	2.30	0.22	0.16	Add
E00630090750S		1.60	0.23	19.05	35.56	2.30	0.22	0.13	Add
E00630110250S		1.60	0.28	6.35	8.64	4.04	0.37	1.62	Add

EXTENSION SPRINGS

SPEC extension springs have a wide application for experimental, development, prototype and maintenance work and have been specified and designed to high precision standards.

MATERIALS

‘E’ part numbers

Music wire: ASTM A228 or AMS 5112

Stainless steel: Type 302 as per ASTM A313or AMS 5688 spring temper (Chemical and Physical only)

‘T’ part numbers

Music wire: DIN 17223 or JIS G4314 A313 SWP-A/B or AMS 5112 Stainless steel: Type 301, 302 or 304 as per DIN 17224 or JIS G4314 SUS 302/304 or AMS 5688 spring temper (chemical and physical only)

TOLERANCES

‘E’ part numbers

Outside Diameter

1.45 to 3.02mm ± 0.08mm

3.05 to 6.10mm ± 0.13mm

6.12 to 12.70mm ± 0.20mm

12.73 to 25.40mm ± 0.38mm

25.43 to 31.12mm ± 0.51mm

31.14 to 37.08mm ± 0.76mm

37.11 to 50.08mm ± 1.02mm

Load P ± 10%

Spring Rate R ± 10%

‘T’ part numbers

All dimension and forces to DIN 2097 (Grade 2)

ADDITIONAL TECHNICAL DATA

All SPEC extension springs have uniform body diameter and are produced with full twist loops the same diameter as the body. They are wound with initial tension, therefore some force is required before the coils are initially separated.

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 length use the formula:

P = (rate x deflection) + Initial Tension

1lb = 4.448 Newtons

1 Newton = 0.225 lb

SURFACE FINISH

Music wire - oiled.

Stainless steel - plain wire.

Shot-peened and plated finishes supplied on request.

Allow sufficient additional time for special finishes.

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