Stainless Steel Touch Springs Collection 02 is a family of custom compression springs engineered for tactile feedback and electrical contact in precision assemblies. You get guaran
Stainless Steel Touch Springs Collection 02 is a family of custom compression springs engineered for tactile feedback and electrical contact in precision assemblies. You get guaranteed tolerance of ±0
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Stainless Steel Touch Springs Collection 02 is a family of custom compression springs engineered for tactile feedback and electrical contact in precision assemblies. You get guaranteed tolerance of ±0.01 mm on outer diameter, runout under 0.05 mm, and a hardness range of 42–48 HRC — verified on every lot before it leaves our Dongguan factory. Lead time is 7 working days for standard sizes, 15 days for fully custom geometry.
Why Touch Springs Need Tighter Runout Than Standard Compression Springs
Touch springs carry current and mechanical load simultaneously. If runout exceeds 0.05 mm, the contact point shifts, causing intermittent signals or uneven force distribution. Our CNC coiling machines hold concentricity between the coil axis and the spring seat to within 0.03 mm. We measure runout with a laser micrometer on 100% of parts — not a sample batch. That is the difference between a spring that works at 50,000 cycles and one that fails at 5,000.
Material Selection: 302, 316L, and 17-7 PH Stainless
We stock three stainless grades for this collection. 302 stainless is the default: it offers good formability and a maximum service temperature of 288°C. For saltwater or chemical exposure, we switch to 316L, which resists pitting and has a lower magnetic permeability. If you need high fatigue life at elevated temperatures, 17-7 PH stainless is precipitation-hardened to 48 HRC — that gives you 30% more load capacity than 302 at the same wire diameter. Tell us your operating environment; we will recommend the grade, not upsell.
Coil Geometry and End Options That Affect Your Assembly
Closed and ground ends are standard on Collection 02 because they provide a flat seating surface — critical for perpendicular load transfer. We also offer closed ends without grinding (for tight axial space) and open ends with pilot diameter control. Wire diameters range from 0.1 mm to 8.0 mm. Free length can go up to 150 mm. If you need a spring that nests inside a bore or over a shaft, we control the pilot diameter to ±0.02 mm so it locates without slop.
Surface Finish: Not Just for Looks — It Controls Friction
Rough surfaces on touch springs create micro-welding points under repeated contact, increasing electrical resistance. Our standard finish is Ra 0.8 µm on the OD. For high-cycle tactile switches, we can go to Ra 0.4 µm with a barrel-polishing pass. That reduces friction by about 15% compared to drawn wire, which translates to lower actuation force drift over the spring's life. We do not passivate unless you ask — passivation adds a day and is only needed for medical or food-contact use.
Inspection Before Every Shipment: Force Testing at 3 Points
Every production lot of Stainless Steel Touch Springs Collection 02 goes through a 3-point force test at 25%, 50%, and 75% of travel. We record the load in newtons and compare it to your drawing tolerance. If any part exceeds ±5% of the specified force, the entire lot is rejected. Dimensional checks include OD, ID, free length, and total coils using a CNC vision system. We ship a lot traceability report with each order — you get the raw data, not just a certificate.
Packaging and Anti-Tangle Protection for Automated Kitting
Springs that ship loose in a bag will tangle, and untangling costs you line time. We offer two standard packaging options: individual poly tubes for springs under 20 mm length, or strip-fed packaging for automated pick-and-place. Each tube is labeled with the part number, lot number, and quantity. For high-volume orders, we can do tape-and-reel packaging compatible with your feeder system. This is standard — not a special request — so there is no extra tooling cost.
How We Keep Precision Manufacturing Costs Low at 7-Day Lead Time
We run 12 CNC coiling machines in-house, so we do not wait on subcontractors. Our wire straighteners are calibrated daily, which reduces scrap and keeps tolerances tight even on long runs. Because we are a CNC cutting tool selection guide compliant shop, we also handle secondary operations like grinding and passivation under one roof. That is how we hold a 7-day lead time for standard sizes and 15 days for custom geometry — without rushing your job.
Specification
Value / Range
Material Grades
302, 316L, 17-7 PH stainless steel
Wire Diameter
0.1 mm – 8.0 mm
Free Length
Up to 150 mm
Outer Diameter Tolerance
±0.01 mm
Runout (concentricity)
≤ 0.05 mm
Hardness (17-7 PH)
42 – 48 HRC
Surface Roughness (OD)
Ra 0.8 µm standard, Ra 0.4 µm optional
Force Tolerance
±5% at 25/50/75% travel
Operating Temperature
-40°C to +288°C (grade dependent)
Lead Time
7 days standard, 15 days custom
MOQ
No MOQ — 1 piece for prototyping accepted
What is the minimum order quantity for Collection 02?
No MOQ — you can order a single prototype spring for testing, and production pricing kicks in at 100 pieces.
Can you match a drawing with a tolerance tighter than ±0.01 mm?
Yes, for wire diameters under 3.0 mm we can hold ±0.005 mm on OD, but this requires a grinding pass and adds 3 days to the lead time.
How do you verify force consistency across a large batch?
We use a 3-point load test on every single spring, not a sample, and reject the lot if any part exceeds ±5% of the specified force.
What is the fastest way to get a quote for a custom spring?
Send a PDF or STEP drawing to sc@bquq.com and we will reply with a firm quote within 12 hours — including force calculation if you do not have one.
If you are still deciding on tolerances or material, our CNC machining tolerances guide explains what is economical versus over-specified. For a firm quote on Stainless Steel Touch Springs Collection 02, send your drawing to sc@bquq.com or WhatsApp +86 13713157787. We will reply within 12 hours with pricing, lead time, and a DFM check — free of charge. Precision manufacturing, made in China, with no MOQ requirements.
