NIYOK Frequently Asked Questions | NIYOK SEALING PARTS CO., LTD.

FAQ

Frequently asked questions

The oil seals and seals in NIYOK have passed ISO 9001 and IATF 16949 in quality management. We has sorted out common problems as below, if you don't find the relevant product problem information below, please click contact us directly above, and we will serve you as soon as possible.

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Sealing Component Selection Guide — Q&A

Faced with a wide range of sealing component specifications and unsure where to start? This guide brings together the most frequently asked questions, answered by our professional team to make your selection...

SQE Seal Supplier Audit Checklist: 5 Key Focus Areas

Procurement Guide: Seal Supplier Assessment Q&A

Engineering Guide: Seal Technical Selection & Best Practices Q&A

Sealing Solutions for Electric Vehicles

Electric vehicles are powered by one or more electric motors and rely on rechargeable batteries to store energy. Compared to internal combustion engines, electric vehicles operate quietly, produce zero...

Battery Passports and Carbon Footprint Declarations: Preparing Your Sealing Supply Chain for Data Requirements.

NIYOK is a rubber sealing component manufacturer with more than 40 years of experience in automotive, motorcycle and industrial sealing applications. Our products are 100% Made in Taiwan (MIT), and we are certified...

What Automotive Seals Do You Need to Watch?

NIYOK is a rubber sealing component manufacturer with more than 40 years of experience in automotive and motorcycle sealing applications. We supply valve stem seals, power steering seals, transmission...

Why Are Seals So Critical in EV Charging Equipment?

NIYOK is a rubber seal manufacturer with over 40 years of expertise in automotive and motorcycle sealing applications, experience we now extend to EV charging infrastructure, serving multiple charging...

Does NIYOK Have an Automotive-Grade Quality System?

A sealing partner built on IATF quality management foundations — for automotive and OEM manufacturers.

Can't Find a Standard Seal for Your EV Component? NIYOK Supports Custom Development

EV sealing requirements are far more demanding than those for conventional vehicles: high-speed rotation, thermal cycling, coolant exposure, waterproofing, dustproofing, and long-term compression stability...

Discontinued Part, Missing Drawing, Worn-Out Seal — Can a Replacement Still Be Made?

Yes. As long as you have the original part, a sample, or partial dimensional data, NIYOK can support a reverse engineering assessment — covering measurement, modeling, material analysis, mold development,...

What causes oil seals and seals to leak?

There are two main reasons to leak, one is the leakage of the inner diameter factor, and the other is the leakage of the outer diameter factor. Therefore, there are so many causes of failure. If you need...

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NIYOK Introduction

Based in Taiwan, NIYOK SEALING PARTS CO., LTD. is a seal and rubber products supplier and manufacturer in Seal Industry.

NIYOK brings 40 years of seal manufacturing expertise, certified to ISO 9001 and IATF 16949, with full quality traceability ensuring consistent batch-to-batch delivery. In 2026, we expanded into the electric vehicle (EV) and semiconductor sectors, offering customized sealing solutions from design through mass production, powered by in-house engineering capabilities. Your trusted precision sealing partner. Inquiries welcome. From oil seals, O-rings, to gaskets, and customized products, application industries include manufacturing, chemical processing, defense, water treatment and filtration, hydraulics, fluid power, heavy trucks, automobiles, aerospace, oil and gas, medical and For life sciences, food and beverages, a complete product line is available for customer needs and specifications.

NIYOK has been offering customers high-quality Oil Seal, Seal, Rubber Parts, Gasket, O-Ring, Custom-slit-valve since 1983, both with advanced technology and 40 years of experience, NIYOK ensures each customer's demands are met.