Linear Solenoids: Selection Guidelines

Solenoids > Linear Solenoids: Selection Guidelines - Tubular Solenoids


	STA^® Series Tubular Solenoids Selection


	Product comparison and links to datasheets

Imperial (inches)

Metric (cm)

STA^® Series has enhanced design features and improved performance
Push and pull models
Strokes up to 2 1/2"
Life rating of 25 million actuations for STA designs

Tubular solenoids are available in ten sizes. The five STA Series sizes are available in both push and pull types.

Use the selection overview chart to determine which size offers the desired performance and mechanical specifications.

Refer to the individual size specification pages for complete performance and mechanical data.

The STA Series is particularly ideal for applications where field service is prohibitive. Its long life and high reliability are definite advantages in applications involving:

Computer peripherals
Industrial sewing machines
Automated teller machines
Blood analyzers
Gate mechanisms
Packaging machinery
Door interlocks
Sorting machines
Glue dispensers
Laboratory equipment
Business machines


	STA Series


	Principle of Operation

A tubular solenoid is a closing airgap device. This solenoid has a long cylindrical coil inserted into a tube, with a movable iron core, or plunger.

When power is applied to the coil, the plunger is magnetically attracted into the stator as it slides along a nylon surface in a linear fashion. By attaching a non-ferrous push rod to the plunger, a pushing or pulling motion can be accomplished.

These devices are sometimes specified where several solenoids are needed within a small footprint or when long strokes are required.


	Pull Type


	Push Type


	Overview of Technology


	STA Construction

The STA is constructed with a low friction nylon bobbin which insures a 25 million actuations life rating on all models.

The problems associated with powdered metal flaking in typical tubular designs is eliminated with the metal-to-plastic bearing surface. In addition, the new design's case is rolled over both ends of the unit for greater shock and vibration integrity, allowing the STA to withstand severe applications in which typical solenoids may come apart.

Both push and pull models offer a built-in combination air gap spacer and plunger stop. This feature eliminates the need for external E-rings and impact washers which typically fail prematurely, as well as get in the way of your attached mechanisms.

All units are provided with 10" PVC lead wires as standard, and are rated for a maximum coil temperature of 130°C. UL-approved materials are used in the construction. For higher temperature applications up to 180°C, please consult the factory for alternate materials which are available in some models. Mechanical and electrical ratings may also be affected. Other options include: special plunger configurations, springs, special mounting features, and anti-rotation flats on mounting bushings. Please consult the factory with details about your application as tooling may apply to some features.


	STA Plunger Configurations

With two standard plunger configurations to choose from, the new STA Series offers stroke lengths up to 0.70" (17,8 mm).

For strokes typically less than 0.060" (0,267 mm), the flat face plunger is recommended with a pull or push force three to five times greater than 60° plungers.


	For longer strokes up to 0.70"

For longer strokes up to 0.750" (17,8 mm), the 60° plunger offers the greatest advantage over the flat face plunger.


	Size 102, 125, 150, 155 and 175 Standard Tubular Models for Large Loads

Ledex Size 102, 125, 150, 155 and 175 standard tubular models are Imperial and 125M, 150M and 175M Metric for heavy duty applications requiring larger forces. These standard models are all pull type and offered with 60° plungers. These models feature heavy duty welded mounting brackets, and heavy duty plunger stops to limit plunger travel, provide positive stopping, and keep pole faces from slamming together at the end of stroke.

An impact cushion made of resilient non-magnetic material absorbs energy at the end of the stroke. This cushion also helps eliminate residual magnetism.

Size 102, 125, 150, 155 and 175 models are available with other plunger configurations, in push type models, and with other mountings. Please consult the factory as tooling may apply.

Imperial Models STA® Tubular Selection Overview
	Solenoid Type	Package Dimensions (in)		Max Stroke	Nominal Stroke	Force (lb) @ Nominal Stroke at Specified Duty Cycle
Size*	Solenoid Type	Dia.	Length	(in)	(in)	100%	50%	25%	10%
STA 1/2" x 1/2"	Pull	0.52	0.55	0.10	0.05	0.18	0.30	0.50	1.0
*MagLatch 1/2" x 1/2"**	Pull	0.52	0.62	0.15	0.075	N/A	0.25	0.48	0.75
STA 1/2" x 1/2"	Push	0.52	0.55	0.10	0.05	0.08	0.18	0.25	0.6
STA 1/2" x 1"	Pull	0.52	1.05	0.50	0.10	0.19	0.31	0.56	1.00
STA 1/2" x 1"	Push	0.52	1.05	0.50	0.10	0.13	0.25	0.48	0.94
STA 1/2" x 2"	Pull	0.52	2.05	0.80	0.30	0.07	0.13	0.20	0.44
STA 3/4" x 1-1/2"	Pull	0.77	1.55	0.70	0.20	0.50	1.00	1.63	2.69
STA 3/4" x 1-1/2"	Push	0.77	1.55	0.70	0.20	0.38	0.80	1.50	2.75
STA 1" x 1-1/8"	Pull	1.02	1.175	0.50	0.10	1.75	2.90	4.90	8.10
STA 1" x 2"	Pull	1.02	2.05	0.70	0.30	0.90	1.75	3.00	5.20
STA 1" x 2"	Push	1.02	2.05	0.70	0.30	0.75	1.88	2.90	5.20
Size 125 1-1/4" x 2-1/4"	Pull	1.25	2.25	0.70	0.40	1.00	2.00	4.00	6.50
Size 150 1-1/2" x 2-1/2"	Pull	1.50	2.50	0.80	0.40	1.00	2.50	5.20	9.80
Size 175 1-3/4" x 4-3/4"	Pull	1.75	4.71	2.50	1.00	1.25	2.50	3.75	6.50
All data is at 20°C coil temperature. Force outputs degrade with elevated temperatures.
* See the "Magnetic Latching Solenoids" section for complete information on all our magnetic latching solenoids.

Metric Models STA® Tubular Selection Overview
	Solenoid Type	Package Dimensions (mm)		Max Stroke	Nominal Stroke	Force (N) @ Nominal Stroke at Specified Duty Cycle
Size*	Solenoid Type	Dia.	Length	(mm)	(mm)	100%	50%	25%	10%
STA 13 x 14	Pull	13.2	13.9	2.5	1.3	0.80	1.33	2.22	4.45
*Mag Latch 13 x 16**	Pull	13.2	15.7	3.8	1.9	N/A	1.11	2.14	3.34
STA 13 x 14	Push	13.2	13.9	2.5	1.3	0.36	0.80	1.11	2.67
STA 13 x 27	Pull	13.2	26.7	12.5	2.5	0.84	1.38	2.49	4.45
STA 13 x 27	Push	13.2	26.7	12.5	2.5	0.58	1.11	2.14	4.18
STA 13 x 52	Pull	13.2	52.1	20.0	7.5	0.30	0.50	0.90	1.90
STA 20 x 40	Pull	19.6	39.4	17.5	5.1	2.22	4.45	7.25	11.97
STA 20 x 40	Push	19.6	39.4	17.5	5.1	1.69	3.56	6.68	12.24
STA 26 x 30	Pull	25.9	29.8	12.5	2.5	7.80	12.9	21.8	36.0
STA 26 x 52	Pull	25.9	52.1	17.5	7.6	4.00	7.79	13.35	23.14
STA 26 x 52	Push	25.9	52.1	17.5	7.6	3.34	8.37	12.90	23.14
Size 125M	Pull	31.8	57.2	18.0	10.2	4.45	8.90	17.80	28.92
Size 150M	Pull	38.1	63.5	20.0	10.2	4.45	11.12	23.14	43.61
Size 175M	Pull	44.4	119.7	63.5	25.4	5.56	11.12	16.69	28.92
All data is at 20°C coil temperature. Force outputs degrade with elevated temperatures.
* See the "Magnetic Latching Solenoids" section for complete information on all our magnetic latching solenoids.

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