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Precision Sight Plugs & Industrial Glass Solutions

Trusted manufacturer of brass, aluminum, stainless steel, and plastic oil sight glasses, breather vent plugs, drain valves, and custom precision parts for global industrial applications.

About Grand Hardware Manufacturing

Grand Hardware Manufacturing Co., Ltd is a leading manufacturer of high-performance industrial sight glasses, breather vent plugs, oil level indicators, and precision-engineered steel components. With years of expertise in CNC milling and turning, we deliver reliable, durable, and corrosion-resistant solutions trusted by industries worldwide.

Our product line includes brass, aluminum, carbon steel, stainless steel, and plastic oil sight glasses, designed for hydraulic systems, machinery, and industrial equipment. We specialize in custom precision turned parts and OEM solutions tailored to your specifications.

CNC Precision Global Export ISO Standards OEM/ODM Support
Factory and Manufacturing

Our Featured Products

Engineered for durability, precision, and performance — our industrial sight glasses and plugs meet the highest standards in hydraulic, automotive, and machinery applications.

NPT Steel Zinc Plated Oil Sight Glass

NPT Steel Zinc Plated Oil Sight Glass

Durable zinc-plated steel construction with NPT thread for reliable oil level monitoring in industrial systems.

Brass Breather Vent Plug with Filter

Brass Breather Vent Plug with Filter

Simple-type hydraulic brass breather with NPT thread and integrated filter for contamination control.

Stainless Steel 304 Drain Valve

Stainless Steel 304 Drain Valve

High-pressure resistant SS304 valve ideal for corrosive environments and demanding hydraulic applications.

Brass Dome Oil Level Sight Glass

Brass Dome Oil Level Sight Glass

NPT1/2 inch brass dome design with clear glass for accurate oil level visibility in hydraulic systems.

Aluminum Oil Sight Glass Plug

Aluminum Oil Sight Glass Plug

Lightweight and corrosion-resistant aluminum plug for oil level indication in compact machinery.

Carbon Steel Oil Sight Glass

Carbon Steel Oil Level Sight Glass

Robust carbon steel construction for heavy-duty industrial applications requiring high strength.

Plastic Oil Sight Glass Indicator

Plastic Oil Sight Glass Indicator

Cost-effective transparent plastic indicator for low-pressure systems and visual monitoring.

Magnetic Oil Drain Plug

Magnetic Oil Drain Plug

Steel plug with integrated magnet to capture metal particles and extend equipment life.

Hydraulic Steel Oil Drain Plug

Hydraulic Steel Oil Drain Plug

High-strength steel plug designed for secure sealing in high-pressure hydraulic reservoirs.

Radiator Filler Neck and Cap

Radiator Filler Neck and Cap

Precision-machined radiator components for efficient coolant system performance and pressure control.

Observation Port Sight Glass

Observation Port Sight Glass

Large viewing area glass for inspection ports in tanks, reactors, and industrial vessels.

Custom Precision Turned Parts

Custom Precision Turned Parts

OEM/ODM services for custom CNC-machined components in brass, steel, aluminum, and plastic.

Why Choose SightPlugs?

Engineered excellence backed by decades of manufacturing expertise.

High Durability

Materials selected for corrosion resistance, high pressure, and long service life in harsh environments.

Precision CNC Manufacturing

Advanced CNC milling and turning ensure tight tolerances and consistent quality across all batches.

Global OEM Support

Custom designs, bulk production, and fast shipping to meet international industrial demands.

15+
Years Experience
50+
Countries Served
10M+
Units Produced
99.8%
Customer Satisfaction

Frequently Asked Questions

What materials are your sight glasses made from?

We manufacture sight glasses from brass, aluminum, carbon steel, stainless steel (including SS304), and high-impact plastic, depending on application requirements.

Do you offer custom designs?

Yes, we specialize in custom precision turned parts and OEM solutions. Share your drawings or specifications for a quote.

What thread types do you support?

We produce products with NPT, BSP, and metric threads. Custom threading is available upon request.

How can I request a product catalog?

Visit sightplugs.com to download the latest product catalog or contact us directly.

Are your products suitable for high-pressure systems?

Yes, especially our stainless steel and carbon steel models are engineered to withstand high pressure and extreme temperatures.

Get in Touch

Reach out for product inquiries, catalogs, or custom manufacturing solutions.

Contact Information

Email: [email protected]

Phone: +86-576-8744 4973

Mobile/WhatsApp: +86-139-6762 1509

WeChat: Tony272829

Skype: Grandmfgcn

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