Brass Enlarger Blocks

Premium Brass Enlarger Blocks for Industrial Instrumentation

Step up your instrumentation and pipeline threads with ultimate stability using the Test Plugs Ltd range of Brass Enlarger Blocks. Unlike standard low-profile enlarger bushes, these block adaptors feature a robust, extended hexagonal body machined from solid brass. This design provides significantly deeper internal thread engagement and a larger external wrenching surface. This makes them perfect for heavy-duty process lines, high-vibration machinery, and configurations requiring a completely rigid, heavy-torque gauge or transmitter mount.

These block fittings are specifically designed to adapt a smaller instrument thread up to a larger pipeline port. To ensure maximum compatibility with both British and American equipment standards, this premium range features both BSP (parallel) and NPT (tapered) options.

Key Features & Benefits

• Heavy-Duty Block Design: The extended hexagonal profile handles high mechanical stresses and prevents fitting distortion or stripping during high-torque installations.
• Deep Internal Threading: Extended female thread depth ensures smaller pressure gauges, test points, or transducers seat deeply and securely.
• Dual Thread Standards Available:
  • BSP Parallel Threads: Ideal for standard British and European process lines when paired with sealing washers or bonded seals.
  • NPT Tapered Threads: Ideal for American-standard equipment, creating a mechanical, interference fit seal along the threads.
• Corrosion-Resistant Solid Brass: High-grade brass construction resists rust, scaling, and operational wear in water, oil, gas, and compressed air lines.