CYLINDER-SCREW-M20X65-D23M20X65-046.1584.3-1

Short Description:

Used for BFT/BHDT pump.
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Details

Product Name: Cylinder Head Screw / Heavy-Duty Hexagon Socket Head Cap Screw (M20 x 65mm) – Part No. D23M20X65/046

Description:
This component is a high-strength metric cylinder head screw, specifically dimensioned as M20 x 65mm (20mm nominal diameter, 65mm length). It is a hexagon socket head cap screw (Allen bolt) manufactured to DIN912 standards .

Constructed from high-grade alloy steel and heat-treated to a property class 12.9 rating, this screw offers the highest tensile strength available for metric fasteners (approximately 1,220 MPa minimum) . This makes it capable of withstanding the extreme clamping loads, vibration, and mechanical stress inherent in high-pressure waterjet intensifier pumps and hydraulic systems operating at 60,000-94,000 PSI (approximately 4,137-6,480 bar).

Applications:

Used as a structural fastener to secure critical components in waterjet intensifier pumps and hydraulic manifolds.
Specifically identified as a cylinder head screw for BFT waterjet intensifier assemblies, used to clamp the cylinder head, end caps, or manifold blocks to the main pump body .
Suitable for ultra-high pressure waterjet systems and heavy-duty industrial fastening applications.

Features:

Property Class 12.9: High-strength alloy steel construction provides exceptional tensile strength and fatigue resistance under cyclic loading .
M20 x 65mm Dimensions: Standard metric coarse thread for secure fit and consistent torque performance.
Hexagon Socket Drive: Internal hex (Allen) drive allows secure tightening in confined spaces within the pump assembly.
Precision Threading: CNC-machined threads ensure consistent clamping force and accurate torque application.
Corrosion-Resistant Finish: Coated to resist galling and degradation from water and hydraulic fluid exposure.

Maintenance:

Failure Diagnosis (When to Replace):

Thread Damage: Stripped, galled, or corroded threads prevent proper tightening and must be replaced immediately.
Stretching or Necking: Visible thread deformation or narrowing indicates the screw has been over-torqued and must be replaced.
Cracking or Fatigue: Any visible cracks on the head or shank warrant immediate replacement.
Difficult Assembly: If the screw feels gritty or binds during threading, threads may be damaged.
Scheduled Overhaul: During major pump rebuilds, it is best practice to replace high-stress fasteners as a set rather than reusing them.

Installation and Inspection Guidelines:

Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system and hydraulic system, and follow lockout/tagout procedures.
Thread Preparation: Clean all threads thoroughly before assembly. Apply a thin, even layer of high-pressure anti-seize lubricant ("Blue Goop" or silver-grade compound) to the threads to prevent galling and ensure accurate torque application .
Torque Compliance (Critical): Use a calibrated torque wrench to tighten the screw to the specific torque value listed in the equipment service manual. Do not over-tighten or under-tighten.
Use Proper Tools: Use the correct size hex key (Allen wrench) and ensure it is fully seated in the socket drive to avoid stripping the head.
Replacement Criteria: Replace the screw immediately if threads are damaged, the hex socket is stripped, the head is cracked, or if the screw shows signs of stretching or corrosion.
Cross-Reference Information: This screw is identified as cylinder head screw D23M20X65/046 for BFT waterjet systems .