18mm Magnetic Precision Screw Metal Cap Manufacturer
Discover Aijiren’s 18 mm magnetic precision screw metal cap: durable, chemically resistant, and designed for automated headspace systems. OEM options available.
Overview
The 18 mm Magnetic Precision Screw Metal Cap from Aijiren provides a reliable, durable, and high-integrity sealing solution for headspace vials and large laboratory bottles. Unlike traditional crimp-top caps, this precision screw cap incorporates a magnetic alignment ring which helps ensure consistent closure without thread misalignment. Constructed from corrosion-resistant metal, it is ideal for repeated use, automated systems, and demanding environmental conditions.
Feature
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Magnetic Alignment: The embedded magnet ring ensures precise and repeatable cap placement, reducing thread wear and improving handling in automated systems.
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Sturdy Screw Thread: A finely made 18 mm metal screw thread delivers mechanical stability and long-term durability.
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High Chemical Resistance: Manufactured from corrosion-resistant metal (e.g., stainless steel or aluminum), this cap tolerates acids, bases, and common solvents.
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Long-Term Reuse: Designed for repeated open-and-close cycles—with minimal deformation or torque loss.
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Septa Compatibility: Compatible with a variety of septa types (PTFE/silicone, rubber, etc.), enabling gas-tight or semi-vented sealing.
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Customizable OEM Options: Supports custom logos, magnetic strength, batch coding, and packaging to meet lab-specific requirements.
Applications
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Headspace GC / VOC sampling
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Large sample or reagent bottles (≥50 mL)
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Automated robotic sample handling systems (CTC or similar)
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Analytical labs requiring long-term, repeated sealing
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Pharmaceutical, environmental, or aroma research labs

Quality Assurance
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Magnetic ring strength verified for proper alignment
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Thread durability tested over thousands of cycles
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Chemical compatibility assessed via solvent and acid/base exposure
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Seal integrity tested with pressure / leak tests
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Batch traceability ensured via lot numbers and COA (Certificate of Analysis)
Packaging & OEM
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Standard Packaging: 100 pieces per box
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OEM Customization Options: Logo engraving, batch coding, custom magnet strength
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Shipping Protection: Foam trays and anti-shock packaging for safe transport
Compatibility
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Suitable for 18 mm neck vials (glass or plastic)
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Works with: screw type, magnetic alignment, and compatible septa
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Perfectly integrated into automated and manual headspace sampling workflows
FAQ
Q1: Why use a magnetic screw cap instead of a crimp cap?
A1: The magnetic screw cap offers consistent alignment, reduces thread wear, and improves handling in automated systems.
Q2: Which septa types are compatible with this cap?
A2: PTFE/silicone and rubber septa are both compatible, depending on the sealing and chemical requirements.
Q3: Is the metal cap resistant to solvents and aggressive chemicals?
A3: Yes. Its metal construction resists common lab reagents, acids, and organic solvents.
Q4: Can this cap be reused many times?
A4: Yes. It’s designed for repeated open-close cycles, maintaining integrity over long-term use.
Q5: Is OEM customization available?
A5: Yes. You can customize the cap’s logo, magnet strength, and batch labeling based on your lab’s needs.
Company Introduction
Founded in 2007, Zhejiang Aijiren, Inc. specializes in chromatography consumables, such as autosampler vials for HPLC, headspace vials, GC vials, micro inserts, septa and caps, syringe filters, etc. covers more than 10,000 square meters, and has a clean workshop of more than 2,000 square meters. 100, 000 class cleaning room;
15 years of export experience, export to more than 70 countries, 2000+ customs around the world;
IS0, GMP & Bureau Veritas certificated, this is how we keep good quality and competitive prices for global valued customers.
Aijiren has its own R&D Center and Quality Control Center to keep products of high quality.
More than 10 years of experience for automatic analysis technique
Passed ISO9001:2015 quality management system certification, RoHS compliance can also be provided.