Shop 8555-H Hollow Hex Metric Plugs

Our Series 8555-H Metric MM Hollow Hex Plug adapters, made from durable carbon steel, are essential components designed to seal off open ports in hydraulic and fluid systems. These plugs feature a hollow hex design, making them easy to install or remove using standard tools, offering convenience in tight spaces. The Metric MM (Metric Male) thread ensures a secure connection that creates a tight seal when installed, preventing leaks and maintaining system integrity. Ideal for systems using metric thread connections, these hollow hex plugs provide a reliable and cost-effective solution for closing unused ports. Built to withstand high-pressure environments, the Series 8555-H adapters are a trusted choice for professionals looking for durable, long-lasting sealing solutions in fluid power systems.

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Male Metric Plugs

8mm to 42mm Nominal Tube OD

Carbon Steel

Click HERE to view the entire 8555-H Carbon Steel Plug MMETRIC Selection

Shop 8555-H Hollow Hex Metric Plugs, Carbon Steel

Click on the model number in the chart below to view that adapter.


Product SKU â–Ľ Brand â–Ľ Material â–Ľ Male Metric Threads â–Ľ Lead Time â–Ľ Price â–Ľ
8555-H08-O OneHydraulics Steel M8 X 1.0 (8mm) 3-5 Days $3.99
8555-H10-O OneHydraulics Steel M10 X 1.0 (10mm) 3-5 Days $4.99
8555-H12-O OneHydraulics Steel M12 X 1.5 (12mm) 3-5 Days $6.58
8555-H14-O OneHydraulics Steel M14 X 1.5 (14mm) 3-5 Days $6.32
8555-H16-O OneHydraulics Steel M16 X 1.5 (16mm) 3-5 Days $10.99
8555-H18-O OneHydraulics Steel M18 X 1.5 (18mm) 3-5 Days $7.54
8555-H20-O OneHydraulics Steel M20 X 1.5 (20mm) 3-5 Days $11.99
8555-H22-O OneHydraulics Steel M22 X 1.5 (22mm) 3-5 Days $12.99
8555-H26-O OneHydraulics Steel M26 X 1.5 (26mm) 3-5 Days $19.99
8555-H27-O OneHydraulics Steel M27 X 2.0 (27mm) 3-5 Days $19.99
8555-H33-O OneHydraulics Steel M33 X 2.0 (33mm) 3-5 Days $39.99
8555-H42-O OneHydraulics Steel M42 X 2.0 (42mm) 3-5 Days $35.99
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See the chart below for additional Dimensional Detail & Pressure Ratings




Still need help? Give us a call at 281.941.2310 or email us at sales@onehydraulics.com for technical support.