Hydraulic Breaker Through Bolts & Tie Rods

SLYM MACHINERY manufactures and supplies heavy-duty hydraulic breaker through bolts (also known as tie rods, tension bolts, or side rods) for major global breaker brands. Positioned vertically through the back head, main cylinder, and front head, these critical fasteners maintain immense axial clamping pressure to hold the power cell assembly firmly together under high-frequency impact operation.

Forged from premium 42CrMo alloy steel and subjected to rigorous quenching and tempering (Q&T) heat treatment, SLYM through bolts deliver exceptional tensile strength, fatigue resistance, and core toughness to prevent tension snaps and thread galling under severe continuous demolition conditions.

1. Product Overview & Structural Function

Through bolts are the ultimate load-bearing fasteners in a hydraulic breaker's power cell. Unlike outer side plate bolts that resist lateral shear, through bolts are constantly subjected to **extreme dynamic axial tension** and cyclic shock waves generated by the piston's high-speed movement.

Key Features & Advantages:

• Premium 42CrMo / 40CrNiMo Alloy Steel: Sourced from certified heavy alloy steel to achieve high yield strength and superior fatigue limits.

• Precision Rolled Threads: Threads are precision-rolled rather than cut, significantly improving grain structure, stress distribution, and thread strip resistance.

• Quenched & Tempered (Q&T): Controlled heat treatment delivers a "hard-yet-flexible" core, allowing the bolt to absorb elastic stretch without permanent deformation or brittle snapping.

• Complete Tie Rod Assembly Kits: Available as individual bolts or complete hardware kits (including through bolts, high-tensile lock nuts, and hardened washers).

• Global Brand Compatibility: Custom and direct-replacement through bolts engineered to fit Soosan, Furukawa, Montabert, Atlas Copco, and other OEM models.

2. Material Metallurgy & Manufacturing Standards

The reliability of a hydraulic breaker tie rod depends heavily on material chemistry and stress-relieving processes.

Standard commercial threaded rods or unverified high-tensile bolts fail quickly because they lack the necessary elastic elongation. SLYM through bolts are built strictly according to OEM standards:

1. High Tensile & Yield Strength: Maintains required clamping preload to prevent cylinder movement and internal oil seal blowout.

2. Fatigue & Shock Resistance: Formulated to endure millions of high-frequency tension cycles without developing micro-cracks.

3. Anti-Corrosion Surface Treatment: Phosphated, blackened, or anti-rust coated to protect threads against moisture, dust, and corrosive working environments.

(Note: Material test certificates (MTC) and specific tensile/yield strength ratings can be provided upon request.)

3. Applications & Brand Compatibility

Through bolts are model-specific components. Because bolt length, shoulder design, and thread pitch vary depending on the breaker's energy class and stroke length, precise dimensional matching is essential.

To ensure 100% compatibility for your equipment, please provide:

• Hydraulic Breaker Brand & Model Number

• OEM Part Number (if available)

• Key Bolt Dimensions: Total length, shank diameter, top/bottom thread specs, and pitch.

• Photos or Drawings: Clear photographs of the worn tie rod or technical drawings.

4. Installation & Maintenance Best Practices

Improper tightening or tension imbalance is the #1 cause of through bolt breakage. Follow these field guidelines:

• Replace in Diagonal Pairs / Full Sets: When one through bolt breaks, the remaining bolts have suffered uneven stress. It is strongly recommended to replace through bolts in pairs or as a complete set.

• Inspect Cylinder Mating Surfaces: Ensure there is no debris, oil film buildup, or burrs between the cylinder sections before torque application.

• Follow Staged Torque Specifications: Always tighten through bolts in a diagonal, crosswise pattern in 2 to 3 torque stages using a calibrated torque wrench or hydraulic torque tool.

• Maintain Nitrogen & Oil Pressure: Operating with low nitrogen pressure or worn piston seals increases irregular shock waves, placing extra tension fatigue on through bolts.

• Check Torque Periodically: Perform routine checks after initial break-in hours and during scheduled maintenance intervals.

5. Request an Exact Match Quote

Need OEM-quality replacement through bolts for your hydraulic hammer?

Contact SLYM MACHINERY today for fast technical matching and direct factory pricing:

[ Request a Through Bolt Quote ]