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Products
We supply full-category shock absorber components, including pistons, stampings, rubber seals, piston rods, springs, and self-developed banding/grooving machines.
Flexible Suspension Valve Shim
Flexible Suspension Valve Shim from XIAYI is polished to a true 0.02 μm mirror, then bored perfectly concentric, so the valve opens smoothly instead of chattering. At our factory every shim is stress-relieved and fully inspected — the damping you tune is the damping that stays.
A valve shim only a few tenths of a millimeter thick decides how oil flows, how the damper responds, and how the car feels on the road. Our Flexible Suspension Valve Shim is engineered around three things that decide all of it: mirror-grade surface, micron-consistent thickness, and a perfectly concentric inner bore. Change thickness by just 0.01 mm and damping shifts by 15–20% — so consistency, not guesswork, is what you are actually buying.
Surface Quality: Sealing, Silence, Durability
| Surface Item | XIAYI Standard | Failure Caused by Poor Surface |
|---|---|---|
| Roughness | Ra ≤ 0.02 μm (mirror grade) | Seal scratch, oil leakage, unstable damping |
| Flatness | ≤ 0.01 mm | Poor sealing, pressure loss, noise |
| Parallelism | ≤ 0.01 mm | Uneven flow, harsh ride |
| Edge condition | Rounded, burr-free, chip-free | Chipping, jamming, seal cutting |
| Stress status | Full stress relief | Thermal deformation, damping drift |
How Thickness Changes the Ride
| Thickness Condition | Flow Behavior | Ride Feel |
|---|---|---|
| Too thin | Early opening, excess flow | Too soft, floating, brake dive |
| Optimized (XIAYI standard) | Linear opening, smooth flow | Smooth, quiet, well controlled |
| Too thick | Hard opening, restricted flow | Too stiff, harsh, impact |
| Uneven thickness | Partial leakage, turbulence | Side-to-side mismatch, loose chassis feel |
Inner Bore: The Quiet Detail That Decides Shock Life
The inner bore is both the locating reference and the flow-control zone. A perfect concentric bore gives balanced flow and quiet operation; an oval or deformed bore creates local vortices that wear the piston rod, generate heat and noise; a burred bore scratches and jams the valve. Every bore is inspected for roundness — no ovals, no burrs, no exceptions.
Pain Points, Root Causes, Fixes
| Customer Pain Point | Root Cause | XIAYI Solution |
|---|---|---|
| Oil leakage & seal failure | Rough surface & sharp edge | Mirror polish + rounded edge |
| Clunking & metallic noise | Poor flatness & uneven stack | Ultra-flat + double-side grinding |
| Left/right shock mismatch | Eccentric bore & thickness error | 100% bore & thickness inspection |
| High-speed float & weak support | Wrong thickness/bore design | Custom flow-optimized shims |
FAQ
Q: Can you match the damping feel we want — softer or sportier?
A: Yes. Because 0.01 mm of thickness moves damping by 15–20%, we tune the feel by selecting thickness and bore geometry rather than changing the whole valve. Tell us the current complaint — too soft, too harsh, floating — and we propose the shim specification.
Q: Our current shims feel different left to right. Can you fix that?
A: Left-right mismatch almost always comes from thickness error or eccentric bores. Our shims are 100% inspected on both, so a batch behaves as one part, not as thousands of slightly different ones.
Q: What applications do these shims cover?
A: Passenger cars, SUVs, EVs, commercial vehicles, motorcycles, tuning and racing, plus construction machinery — same mirror-grade standard across all of them.
Describe the damping complaint — get the shim spec that fixes it
Ningbo XiaYi Electromechanical Tech Co., Ltd. tunes valve shims by real thickness and bore data, not by trial and error. Send your current damping issue and receive a flow-optimized shim proposal.
About XIAYI real-vehicle tuning: the thickness and bore combinations we recommend are not copied from a chart — each one has been driven and verified on real vehicles, from commuting sedans to race-prepped suspensions, so the feel you ask for is the feel that was actually tested.
Send Inquiry
Contact Info
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Address
No.209 Lane 520 Tongning Rd,Qianjiang Street,Jiangbei District, Ningbo City, Zhejiang Province, China
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Tel
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Get a Tailored Quote for Your Shock Absorber Parts
Why Global Buyers Choose Ningbo Xiayi:
✓ IATF 16949 Certified — Defect rate strictly controlled below 0.1%.
✓ Full-Category Supply — Pistons, rods, springs, stampings & rubber parts.
✓ R&D Support — Custom powder metallurgy formulas & 7-10 day rapid prototyping.
✓ Proven Capacity — 50 million core pistons produced annually for global OEMs.
Ready to start? Complete the form below and our engineering team will respond within 24 hours with a custom recommendation.
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