Product Name: Hollow Screw / Hollow Set Screw (Part No. 510000721)

Description:
This component is a hollow screw, also known as a hollow set screw or hollow plug. It is a specialized threaded fastener with a longitudinal bore (hole) drilled through its center axis, manufactured from high-strength stainless steel or hardened alloy. Unlike a standard solid screw, this hollow design serves a dual purpose: it acts as a sealing plug while simultaneously providing a restrictive fluid passage. It is designed for use in high-pressure hydraulic or water circuits within a waterjet cutting system, where a controlled bleed path or specific fluid routing is required.

Applications:

• Provides a metered or controlled flow path through its hollow center

• Acts as a retaining screw or plug for a component where fluid must pass through the center

• Used in high-pressure check valve assemblies, manifolds, or intensifier blocks

• Suitable for ultra-high pressure waterjet systems, typically rated for 60,000 PSI (approximately 4,137 bar) and above

Features:

• Specialized Fluid Path: The hollow core allows fluid to pass through the center of the fastener, eliminating the need for external bypass plumbing

• High-Pressure Integrity: Engineered from corrosion-resistant, high-strength material to withstand extreme pressure cycling without deformation

• Precision Threading: Machined to exact tolerances for a leak-proof fit in the valve or manifold body

• Restrictive Design: The internal diameter of the bore is often precision-sized to act as a flow restrictor or bleed orifice

Maintenance:

• Inspect for Leaks: Before operation, check the head of the hollow screw for any signs of high-pressure water weepage or hydraulic oil seepage

• Thread Care: During servicing, inspect the threads for galling, corrosion, or damage. Apply high-pressure thread lubricant or anti-seize compound before reinstallation to prevent seizure

• Internal Bore Cleaning: Over time, the small internal bore can become clogged with debris or mineral deposits. Use a soft wire or compressed air to clear the passage; do not use hard metal tools that could score the internal diameter and affect the flow rate

• Torque Compliance: Tighten the hollow screw to the specific torque value listed in the equipment service manual. Over-tightening can distort the hollow core or damage the housing threads

• Full Depressurization: Always fully depressurize the waterjet system (both hydraulic and high-pressure water circuits) and follow lockout/tagout procedures before removing or servicing the hollow screw

• Replacement Criteria: Replace the hollow screw immediately if the threads are damaged, the hex drive is stripped, the head is cracked, or if the internal bore shows signs of severe erosion or blockage that cannot be cleared