Product Name: Cylinder Head Screw / Heavy-Duty Intensifier Tie Rod (M20 x 360mm) – Part No. D23M20360/046

Description:
This component is an extra-long, high-strength metric cylinder head screw, specifically dimensioned as M20 x 360mm (20mm nominal diameter, 360mm length). It is manufactured as a heavy-duty socket head cap screw (Allen bolt) 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 operating at 60,000-94,000 PSI (approximately 4,137-6,480 bar).

According to BFT waterjet intensifier parts diagrams for assemblies CP022001/2 and HT022012/172, this screw is identified as Item 12 (CP022001/2) and Item 11 (HT022012/172) and is used as a cylinder head screw or tie rod bolt to clamp the intensifier stack together . It is a critical structural fastener that secures the end bells, hydraulic cylinder, and high-pressure cylinder into a single rigid assembly.

Applications:

• Used as a primary structural tie rod bolt to secure the intensifier stack assembly in BFT waterjet intensifier pumps 

• Clamps the end bells, hydraulic cylinder, and high-pressure cylinder together under extreme preload

• Used during major pump overhauls, complete intensifier rebuilds, or when cylinder head fasteners are damaged

• Compatible with BFT intensifier assemblies CP022001/2 and HT022012/172 

Features:

• Property Class 12.9: High-strength alloy steel construction provides exceptional tensile strength and fatigue resistance under cyclic loading

• M20 x 360mm Dimensions: Extra-long, coarse-thread metric bolt with 65mm thread length, designed for deep engagement in the intensifier stack

• 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

• Critical Structural Role: Ensures the alignment and clamping of the intensifier stack, which is vital for preventing oil manifold leaks and seal failure 

• 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

• Intensifier Leakage: External oil or water leaks from between sections of the pump stack may indicate insufficient or uneven tie rod torque

• Scheduled Overhaul: During major pump rebuilds, it is best practice to replace high-stress fasteners as a set rather than reusing them

Inspection and Replacement 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. Over-tightening can damage threads; under-tightening will cause leaks

• 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 listed as Item 12 in BFT intensifier CP022001/2 parts list and Item 11 in HT022012/172 parts list . It is also identified as part number D23M20360/046 

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