High-strength 12mm M12 spline bolt with internal hex, ideal for excavators and machinery requiring vibration-resistant fastening.
OEM-quality 12mm spline bolt with M12-40(51.5) length specification
Internal hex drive design for secure and stable tightening
Heat-treated alloy steel provides excellent load-bearing strength
Anti-loosening spline shank ideal for high-vibration machinery
Widely used in excavator hydraulic systems, swing motors, and structural connections
The YNF17708 12mm spline bolt is engineered for heavy-duty excavators and industrial machinery that require secure, vibration-resistant fastening. With an M12 thread, internal hex drive, and a spline-type shank, this bolt provides superior anti-rotation performance, ensuring stable fastening in high-load and high-impact environments. The length configuration of 40mm (51.5mm overall) fits a wide range of hydraulic and structural assemblies.
Manufactured from heat-treated alloy steel, the bolt delivers excellent tensile and shear strength, resisting deformation even under continuous vibration. Its precision machining ensures consistent thread engagement and long service life.
This spline bolt is widely used in hydraulic pumps, swing reducers, travel motors, valve blocks, and machinery structural joints. YNF Machinery supplies durable, cost-effective fasteners trusted by workshops, parts distributors, equipment fleets, and maintenance teams.
| Parameter | Details |
|---|---|
| YNF Part Number | YNF17708 |
| Product Type | Spline Bolt / Internal Hex Screw |
| Diameter | 12mm |
| Thread Size | M12 |
| Length Specification | 40mm (51.5mm overall) |
| Drive Type | Internal Hex |
| Shank Type | Spline |
| Material | Heat-treated Alloy Steel |
| Application | Excavators, machinery, hydraulic systems |
| Resistance | Vibration, pressure, corrosion |
| Installation | Threaded, standard tools required |
| Origin | China |
| Brand | YNF |
| MOQ | 1 Piece |
| Shipping | Air, Sea, Express |
| Payment Terms | T/T, PayPal, Western Union |
| Application Area | Description |
|---|---|
| Excavator Hydraulic Components | Used in pumps, valve blocks, swing motors |
| Structural Machinery Connections | Provides stable fastening under heavy vibration |
| Industrial Equipment Assembly | Suitable for gear housings and mechanical joints |
| Heavy-Duty Machinery Repair | Ideal for overhaul and routine replacement |
| Aftermarket Fastener Distribution | Preferred by wholesalers and repair workshops |
Related Products:
14mm Spline Bolt M14
16mm Spline Bolt M16
Excavator Structural Bolt Kits
Heavy-Duty Internal Hex Fasteners
FAQs：
Q: What is the overall length of this bolt?
A: 51.5mm overall, 40mm thread length.
Q: What machinery is this bolt suitable for?
A: Excavators, hydraulic systems, mechanical assemblies.
Q: What material is it made of?
A: Heat-treated alloy steel for maximum durability.
Q: MOQ?
A: MOQ = 1 piece.
The YNF17708 12mm spline bolt offers strong, stable fastening for excavators and heavy machinery requiring vibration-resistant hardware. With its heat-treated alloy steel body, internal hex drive, and precision spline shank, it ensures long-lasting performance in demanding applications. YNF Machinery provides consistent quality, competitive wholesale pricing, and fast worldwide delivery—ideal for repair shops, distributors, and machinery fleet owners. Contact us now for a quotation.
