Durable 12mm spline bolt with internal hex, designed for excavators and industrial machinery needing secure fastening.
High-strength 12mm spline bolt with M12-34/46 thread lengths
Internal hex drive provides secure tightening in compact spaces
Precision-machined 1.75 pitch ensures stable locking and vibration resistance
Heat-treated alloy steel offers excellent tensile and shear strength
Suitable for excavators, hydraulic systems, and mechanical assemblies
The YNF02122 12mm spline bolt is a heavy-duty fastening component widely used in excavators, hydraulic systems, and other construction machinery. With an M12 thread, internal hex drive, and splined shank, this bolt ensures stable locking performance in high-vibration environments, making it ideal for structural joints and hydraulic mounting points.
Available in 34mm and 46mm lengths, it fits a variety of installation needs. The bolt is manufactured from heat-treated alloy steel, providing impressive resistance to tension, shear forces, and repeated impact loads. Its precise threading and smooth machining improve installation accuracy and long-term fastening reliability.
This spline bolt is frequently applied in boom/arm joints, hydraulic valve mounts, swing motor covers, gear housings, and heavy-equipment assemblies. YNF Machinery supplies consistent quality with competitive wholesale pricing—making it a preferred choice for repair workshops, equipment fleets, and aftermarket distributors.
| Parameter | Details |
|---|---|
| YNF Part Number | YNF02122 |
| Product Type | Spline Bolt / Internal Hex Screw |
| Diameter | 12mm |
| Thread Size | M12 |
| Length Options | 34mm / 46mm |
| Thread Pitch | 1.75 |
| Drive Type | Internal Hex |
| Material | Heat-treated Alloy Steel |
| Application | Excavators, hydraulic systems, machinery components |
| 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, brackets |
| Hydraulic Component Mounting | Suitable for pumps, valves, motors |
| Gearbox & Mechanical Assembly | Provides stable locking in high-vibration environments |
| Repair & Replacement Parts | Ideal for maintenance workshops |
| Aftermarket Fastener Distribution | Widely used by parts wholesalers |
Related Products:
16mm Spline Bolt M16
18mm Spline Bolt M18
Excavator Structural Fasteners
Heavy-Duty Internal Hex Bolts
FAQs：
Q: What lengths are available?
A: 34mm and 46mm.
Q: Is this bolt suitable for excavator use?
A: Yes, it is widely used in hydraulic and structural components.
Q: What material is used?
A: Heat-treated alloy steel.
Q: MOQ?
A: MOQ = 1 piece.
The YNF02122 12mm spline bolt delivers excellent fastening strength for excavators and industrial machinery. Its alloy-steel construction and precise splined threading ensure stable performance under heavy vibration and extreme working conditions. YNF Machinery offers consistent quality, competitive B2B pricing, and fast global shipping—ideal for repair centers, fleet owners, and aftermarket distributors. Contact us today for an accurate quotation.
