About Our Boom Guid Bushings
Boom Guide Bushings are cylindrical wear-resistant components fitted at telescopic boom articulated and sliding joints of construction machinery.
Our custom boom guide bushings are manufactured via alloy steel forging + full CNC precision machining.
They play roles in positioning, limiting and anti-sway during boom telescopic movement, effectively reducing friction and avoiding abnormal jitter or abrasion.
Performance highlights of our boom bushings:
✅ High wear resistance
✅ Precise dimensional tolerance
✅ Impact-resistant
✅ Long service life for heavy construction & mining
Materials of Guide Bushings
Three materials we often produce:
- 45# (C1045/1.0503): an economy forging carbon steel for boom guide bushings, cost friendly for light-load construction machinery and small boom
- 40Cr (5140/1.7035): medium-carbon chromium alloy steel, more wear-resistant than 45# and cheaper than 42CrMo, preferred for medium and small load equipment
- 42CrMo (4140/1.7225): high-performance chromium-molybdenum alloy steel with superior hardenability, impact resistance and abrasion resistance. Best for bad working conditions, e.g. high load, impact, and mining
Technical Specifications
| Item | Parameter |
| Product Name | Guide Bushing |
| Optional Forging Materials | 45# (C1045), 40Cr (5140), 42CrMo (4140) alloy steel, others as required |
| Hardened Inner Hole Hardness | HRC 48–56, or according to drawing |
| Substrate Core Toughness | Unhardened core retains good impact toughness |
| Applicable Equipment Weight Load | Light load / Medium load / Heavy & impact load mining machinery |
| Custom Size Range | OD: 100-1500mm; Length: 100-3000mm |
| Matching Equipment | Excavator, telescopic jib crane, truck-mounted crane, hydraulic aerial work platform, underground mining LHD loader, rock drilling rig, wheel mining loader, mine reach stacker |
Standardized Forging & Machining Delivers Stable Premium Quality
Stable premium quality, long-lasting of our boom guide bushings come from our standardized in-house forging, targeted heat treatment and full CNC precision machining processes:
- Rigorous raw material selection and batch spectral testing guarantees consistent material composition
- Stable high-temperature forging forms dense metal grain structure, delivers outstanding impact resistance
- Inner-hole induction quenching creates high surface wear resistance, maintaining core material toughness
- Post heat treatment eliminates internal stress, reduces dimensional deformation during precision machining
- Multi-axis CNC machining controls tight tolerances and smooth inner surfaces
Drawing Custom Order Process
- Send us complete engineering drawings
- Our technical team reviews drawing feasibility and provides targeted material matching quotation
- Develop exclusive forging blanks and formulate corresponding quenching process parameters
- Sample production + hardness, dimensional and assembly performance testing
- Mass production after customer sample confirmation
- Full quality inspection before shipment
Working Condition Selection Reference
- Light load, low friction frequency indoor construction equipment → 45# carbon steel guide bushings
- Medium load, conventional urban lifting machinery → 40Cr alloy steel guide bushings
- Heavy load, frequent impact, dusty underground mining environments → 42CrMo alloy steel guide bushings
Questions You May Have
Q: Why is induction quenching only done on the inner hole instead of the whole bushing?
A: It aims to form a controlled-depth hardened layer to resist sliding or rotating friction on the inner hole surface, at the same time keep the bushing core with good toughness, which avoids cracking and fracture under frequent boom impact loads. If the entire bushing is fully hardened, the bushing will become brittle and easy to break during operation.
Q: What hardness and hardened layer depth can you achieve after induction quenching?
A: HRC 48–56, we can adjust the hardness and hardened layer depth according to requirements.
Q: For which construction and mining machinery do you produce boom guide bushings?
A: Excavators, telescopic jib cranes, truck-mounted cranes, hydraulic aerial work platforms, underground LHD loaders, rock drilling rigs, wheel mining loaders and mine reach stackers for construction and underground mining projects.
Q: What's the MOQ for custom boom guide bushings?
A: 1 piece
Q: How do you prevent rust of alloy steel bushings during long sea transportation?
A: By applying anti-rust oil and wrapping plastic film, then packing them into sealed fumigated wooden crates.
Q: Can 42CrMo guide bushings be used in dusty underground mining environments?
A: Yes. 42CrMo alloy steel has excellent wear resistance and impact resistance, perfectly adapting to high-dust, heavy-load and frequent impact underground mining working conditions.
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