High-strength 18mm spline bolt with internal hex, designed for excavators and heavy machinery requiring secure fastening.
Heavy-duty 18mm spline bolt with M18-49/68 thread lengths
Internal hex design ideal for tight installation spaces
2.0 pitch for secure holding, vibration resistance, and stable locking
Made from heat-treated alloy steel for durability and high load capacity
Suitable for excavator structural joints, hydraulic components, and mechanical assemblies
The YNF01429 18mm spline bolt is a high-strength fastening element used across excavators, hydraulic assemblies, and other heavy-duty machinery. Featuring an M18 thread, internal hex drive, and splined shank, this bolt provides strong rotational stability and reliable clamping force, making it ideal for high-vibration environments.
Available in 49mm and 68mm length options, the bolt meets a wide range of mechanical installation requirements. Manufactured from heat-treated alloy steel, it offers excellent tensile strength, shear resistance, and long-term performance under heavy loads. The precision-machined thread ensures proper fit, stable locking, and reduced risk of loosening during continuous machine operation.
Commonly used for hydraulic valve mounting, swing motor covers, gearbox components, structural frames, and excavator joint systems, this spline bolt is trusted by workshops, equipment fleets, and aftermarket parts distributors for its reliability and cost-effectiveness.
| Parameter | Details |
|---|---|
| YNF Part Number | YNF01429 |
| Product Type | Spline Bolt / Internal Hex Screw |
| Diameter | 18mm |
| Thread Size | M18 |
| Length Options | 49mm / 68mm |
| Thread Pitch | 2.0 |
| Drive Type | Internal Hex |
| Material | Heat-treated Alloy Steel |
| Application | Excavators, hydraulic systems, machinery assemblies |
| Usage | Structural fastening, mounting, mechanical joints |
| Brand | YNF |
| Origin | China |
| MOQ | 1 Piece |
| Shipping | Air, Sea, Express |
| Payment Terms | T/T, PayPal, Western Union |
| Application Area | Description |
|---|---|
| Excavator Structural Fastening | For booms, arms, frames, and linkage systems |
| Hydraulic Component Mounting | Suitable for pumps, valves, swing motors |
| Gearbox & Motor Assembly | Ensures vibration-resistant locking |
| Heavy Machinery Maintenance | Used for repairs and rebuilds |
| Aftermarket Fastener Distribution | Popular among wholesalers and repair workshops |
Related Products:
16mm Spline Bolt M16
Heavy-Duty Hex Bolts for Excavators
Industrial Machinery Fastener Kits
Alloy Steel Internal Hex Screws
FAQs：
Q: What length options are available?
A: 49mm and 68mm.
Q: Is this bolt suitable for excavator structural and hydraulic parts?
A: Yes, widely used in both applications.
Q: What material is used?
A: Heat-treated alloy steel for high load capacity.
Q: MOQ?
A: MOQ = 1 piece.
The YNF01429 18mm spline bolt provides exceptional strength and reliability for excavators and heavy machinery. Manufactured with heat-treated alloy steel and precise splined threading, it ensures secure locking under high vibration and extreme working conditions. YNF Machinery offers stable quality, competitive wholesale pricing, and fast global shipping—ideal for equipment maintenance centers, fleet operators, and aftermarket distributors. Request your quotation today.
