Ultra-High Deflection Coil Springs - 65% Deflection SWY Series

Q: How do I select the spring diameter (D) and length (L) for a mold space constraint?

Use the available ranges D = 11–42 mm and L = 20–300 mm to fit the spring pack envelope around the ejector, stripper, or return mechanism. After confirming physical clearance, verify the selected combination can achieve the required allowable deflection (13–195 mm) without exceeding the mechanism’s travel.

Q: What does “65% deflection” imply for sizing and performance in injection mold cycles?

This series is specified as an ultra-high deflection configuration with a 65% deflection design basis, meaning it is intended for controlled load behavior under large travel. In sizing, match your expected working stroke to the provided allowable deflection (13–195 mm) so the spring operates in its intended deflection region.

Q: How do I choose spring constant and load to match my actuator force requirement?

Select based on the spring constant 0.45–12.07 N/mm and resulting load 29.4–392.3 N for your required stroke. Confirm the required force at the working deflection aligns with the application duty, and ensure the deflection does not exceed the product’s allowable deflection range.

Q: Is this spring appropriate for molds operating at elevated temperatures?

The series is specified with heat resistance up to 200°C , making it suitable for mechanisms exposed to elevated temperatures, such as heated zones near hot-runner or thermally loaded mold functions. For high-cycle duty, validate your temperature profile and working deflection against the spring’s allowable deflection range.

Q: Does the spring surface finish (paint) affect compatibility in precision assemblies?

The input data indicates options for with/without paint peeling (Yes/No). If your mechanism requires tighter cleanliness or you want to avoid issues from paint-related wear, select the No option and confirm fit/clearance for your sliding or contacting parts.

Ultra-High Deflection Coil Springs - 65% Deflection SWY Series are designed to deliver stable load behavior under large deflection, using flat wire for controlled spring performance. Built for long service in elevated temperature environments up to 200°C.

Optimized 65% deflection for high travel spring response
Flat wire design helps maintain predictable force characteristics
Heat resistance up to 200°C supports thermal durability in duty cycles
Available in multiple sizes to match assembly space and load requirements

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Specifications

326 configurations available

D (Diameter) (mm)	L (Length) (mm)	d (Inner Diameter - Flat Type Only)	Spring Constant (N/mm)	Load (N)	Allowable Deflection (mm)	With/without paint peeling	type
11	20	7	2.26	29.4	13.0	Yes	-
11	25	7	1.81	29.4	16.3	Yes	-
11	30	7	1.51	29.4	19.5	Yes	-
11	35	7	1.29	29.4	22.8	Yes	-
11	40	7	1.13	29.4	26	Yes	-
11	45	7	1.01	29.4	29.3	Yes	-
11	50	7	0.91	29.4	32.5	Yes	-
11	55	7	0.82	29.4	35.8	Yes	-
11	60	7	0.75	29.4	39	Yes	-
11	65	7	0.70	29.4	42.3	Yes	-
11	70	7	0.65	29.4	45.5	Yes	-
11	75	7	0.60	29.4	48.8	Yes	-
11	80	7	0.57	29.4	52.0	Yes	-
11	90	7	0.5	29.4	58.5	Yes	-
11	100	7	0.45	29.4	65.0	Yes	-
12.5	20	8.5	3.09	40.2	13.0	Yes	-
12.5	25	8.5	2.47	40.2	16.3	Yes	-
12.5	30	8.5	2.06	40.2	19.5	Yes	-
12.5	35	8.5	1.77	40.2	22.8	Yes	-
12.5	40	8.5	1.55	40.2	26	Yes	-
12.5	45	8.5	1.37	40.2	29.3	Yes	-
12.5	50	8.5	1.24	40.2	32.5	Yes	-
12.5	55	8.5	1.12	40.2	35.8	Yes	-
12.5	60	8.5	1.03	40.2	39	Yes	-
12.5	65	8.5	0.95	40.2	42.3	Yes	-
12.5	70	8.5	0.88	40.2	45.5	Yes	-
12.5	75	8.5	0.82	40.2	48.8	Yes	-
12.5	80	8.5	0.77	40.2	52.0	Yes	-
12.5	90	8.5	0.69	40.2	58.5	Yes	-
12.5	100	8.5	0.62	40.2	65.0	Yes	-
12.5	110	8.5	0.56	40.2	71.5	Yes	-
12.5	120	8.5	0.52	40.2	78.0	Yes	-
12.5	125	8.5	0.49	40.2	81.3	Yes	-
16.5	20	10.5	7.02	91.2	13.0	Yes	-
16.5	25	10.5	5.61	91.2	16.3	Yes	-
16.5	30	10.5	4.68	91.2	19.5	Yes	-
16.5	35	10.5	4.01	91.2	22.8	Yes	-
16.5	40	10.5	3.51	91.2	26	Yes	-
16.5	45	10.5	3.12	91.2	29.3	Yes	-
16.5	50	10.5	2.81	91.2	32.5	Yes	-
16.5	55	10.5	2.55	91.2	35.8	Yes	-
16.5	60	10.5	2.34	91.2	39	Yes	-
16.5	65	10.5	2.16	91.2	42.3	Yes	-
16.5	70	10.5	2	91.2	45.5	Yes	-
16.5	75	10.5	1.87	91.2	48.8	Yes	-
16.5	80	10.5	1.75	91.2	52.0	Yes	-
16.5	90	10.5	1.56	91.2	58.5	Yes	-
16.5	100	10.5	1.40	91.2	65.0	Yes	-
16.5	110	10.5	1.28	91.2	71.5	Yes	-
16.5	120	10.5	1.17	91.2	78.0	Yes	-

Product Guide

🏭Application Scenarios+

Ultra-high deflection coil springs are used in injection mold tooling anywhere spring packs must deliver stable force through long travel. This 65% deflection variant is particularly suited to return or over-travel functions where the actuator stroke regularly approaches the spring’s working deflection range.

Hot-runner and heated system mechanisms: springs exposed to elevated temperatures benefit from this series’ duty capability up to 200°C, helping maintain predictable load behavior during thermal cycling.
Plastic ejector and stripper assist features: the 65% deflection design supports controlled response under large deflection, improving repeatability when ejector travel varies between cycles.
Compact core/cavity accessory assemblies: the flat wire configuration helps provide consistent force characteristics within limited installation envelopes when matching the available D (11–42 mm) and L (20–300 mm) ranges.

For these scenarios, selecting the appropriate diameter, length, and allowable deflection supports consistent spring return force while reducing variability across temperature and stroke.

🔧Material & Process Details+

The provided specifications for this SWY series focus on geometry and thermal performance; a specific steel grade, hardness (HRC), and heat-treatment state are not listed in the input data. For engineering planning, treat the series as a high-temperature tolerant coil spring intended for service up to 200°C, with force stability designed around large-cycle deflection.

Manufacturing approach (from construction): the flat wire design is used to deliver controlled spring performance and predictable force characteristics across deflection.
Heat resistance: rated for duty environments up to 200°C, supporting thermal durability under cycling loads.
Trade-offs: operating at high deflection with thin, profiled wire typically prioritizes controlled force over absolute maximum load per size; actual durability depends on selected deflection and temperature cycle profile.

If your application requires a specific steel grade and target hardness/treatment, request the material certificate/spec sheet for this series and size.

Frequently Asked Questions

How do I select the spring diameter (D) and length (L) for a mold space constraint?+

Use the available ranges D = 11–42 mm and L = 20–300 mm to fit the spring pack envelope around the ejector, stripper, or return mechanism. After confirming physical clearance, verify the selected combination can achieve the required allowable deflection (13–195 mm) without exceeding the mechanism’s travel.

What does “65% deflection” imply for sizing and performance in injection mold cycles?+

This series is specified as an ultra-high deflection configuration with a 65% deflection design basis, meaning it is intended for controlled load behavior under large travel. In sizing, match your expected working stroke to the provided allowable deflection (13–195 mm) so the spring operates in its intended deflection region.

How do I choose spring constant and load to match my actuator force requirement?+

Select based on the spring constant 0.45–12.07 N/mm and resulting load 29.4–392.3 N for your required stroke. Confirm the required force at the working deflection aligns with the application duty, and ensure the deflection does not exceed the product’s allowable deflection range.

Is this spring appropriate for molds operating at elevated temperatures?+

The series is specified with heat resistance up to 200°C, making it suitable for mechanisms exposed to elevated temperatures, such as heated zones near hot-runner or thermally loaded mold functions. For high-cycle duty, validate your temperature profile and working deflection against the spring’s allowable deflection range.

Does the spring surface finish (paint) affect compatibility in precision assemblies?+

The input data indicates options for with/without paint peeling (Yes/No). If your mechanism requires tighter cleanliness or you want to avoid issues from paint-related wear, select the No option and confirm fit/clearance for your sliding or contacting parts.