Frequently Asked Questions (FAQ)

NIYOK combines expert sealing engineering, over 40 years of manufacturing experience, and advanced production equipment to deliver comprehensive sealing solutions for customers worldwide.

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 simpler and more precise.


Most seal projects go wrong at first sampling or through field leaks after ramp-up, and both usually trace back to incomplete requirements or to tolerance stack-up between the groove, the seal and real...

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When auditing a seal supplier, verify five things: inspection equipment (NIYOK uses a CMM, rheometer, tensile tester, microscope and oil seal endurance tester), batch traceability from raw material to shipment,...

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Judge a seal supplier on total cost, not unit price. Check the quality system (NIYOK is certified to ISO 9001 and IATF 16949), testing capability, lead time and rush-order process (our standard custom...

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To get a seal recommendation quickly, send NIYOK the application type (static, rotary or reciprocating), the contact media, normal and peak temperature and pressure, dimensions with tolerances, and a drawing...

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NIYOK Sealing Component Selection Guide — Q&A Introduction

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

NIYOK brings over 40 years of seal manufacturing expertise, certified to ISO 9001 and IATF 16949, with full quality traceability ensuring consistent batch-to-batch delivery. We have 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 43 years of experience, NIYOK ensures each customer's demands are met.