An SPT machine is a purpose-built drilling system that performs Standard Penetration Testing alongside conventional core drilling operations. It mounts a standardized SPT hammer assembly onto a full hydraulic core drill rig, so field crews can collect both soil strength data and rock core samples from the same borehole. The SPT drilling machine eliminates the need to mobilize separate geotechnical testing equipment, cutting project costs and reducing setup time on every site.
The Standard Penetration Test itself works by dropping a 63.5-kilogram hammer through a 76-centimeter fall distance onto a split-barrel sampler. The sampler — 51 mm outer diameter, 35 mm inner diameter, and over 457 mm long — drives into the soil at the bottom of the borehole. Operators count how many blows it takes to penetrate the final 30 centimeters; that number is the N-value, a widely recognized indicator of soil density, bearing capacity, and consistency.
SPT Machine Parameters:
| Model | YGX-400 | YGX-600 | YGX-800 | YGX-1000 |
| Drilling Depth(M) | 180-400-500 | 200-600-650 | 400-800-1000 | 500-1000-1100 |
| Rated pressure(MPA) | 21 | 21 | 25 | 28 |
| Rated Flow(L/min) | 168 | 192 | 260 | 300 |
| Heat Dissipation Mode | Air cooling+water cooling | |||
| Engine Brand | Yuchai | Yuchai | Yuchai | Cummins |
| Rated power/speed | 78kW/ 2400r/min | 92kW/ 2400r/min | 92kW/ 2400r/min | 154kW/2400r/min |
| Drilling Angle(°) | 0-90 | 45-90 | 45-90 | 45-90 |
| Lifting Force(T) | 12 | 16 | 24 | 30 |
| Feed Force(T) | 6 | 8 | 12 | 15 |
| Hydraulic Mud pump flow | 30-90（L/min） | 30-90（L/min） | 90-180（L/min） | 90-180（L/min） |
| Hydraulic Mud pump power | 4-7(MPA) | 4-7(MPA) | 4-7(MPA) | 4-7(MPA) |
| Dimension | 4000*1900*1800mm | 4000*2000*1800mm | 5500*2100*2000mm | 6000*2200*2400mm |
| Weight | 4.3T | 4.5/5.5T | 6.5T | 7.5T |
Key Features of the YG SPT Machine
Our SPT machine stands out in the market thanks to its optimized structural design and all-hydraulic transmission system. The tower-integrated frame enables rapid hole relocation and setup, dramatically reducing manpower requirements on site. The crawler-mounted chassis comes with remote control functionality, ensuring safe and convenient movement across uneven terrain.
The telescopic mast design removes the need for a separate drilling tower, making transportation and assembly faster and safer. The top-drive power head runs on a long-stroke guide rail with hydraulic cylinder feed, eliminating frequent rod changes and delivering superior directional accuracy. As a compact SPT drill rig, it occupies minimal ground space and requires no foundation work, making it an eco-friendly choice for sensitive sites.
The all-hydraulic system offers stepless speed adjustment, stable drilling performance, and low vibration levels. Real-time pressure monitoring with overload protection keeps operators informed of downhole conditions at all times. Maintenance is straightforward thanks to the flexible, accessible layout of hydraulic components.
For coring operations, the thin-wall diamond wireline coring technology produces large-diameter core samples with high recovery rates. The drill string maintains full rigidity and straightness for excellent borehole control, while the small annular gap reduces the risk of stuck rods and downtime.
How Standard Penetration Testing Works in the Field?
Standard Penetration Test (SPT) measures soil resistance by driving a split-barrel sampler into the ground using a standardized hammer system. The test uses a 63.5 kg hammer dropped from a height of 76 cm. The number of blows required to drive the sampler 30 cm into the soil gives the standard penetration resistance value, known as the N-value.
The sampler itself features an outer diameter of 51 mm, an inner diameter of 35 mm, and a length exceeding 457 mm. A 76 mm long driving shoe with a 18° to 20° cutting angle and 1.6 mm thick cutting edge attaches to the lower end, while drill rods connect to the top. This SPT drill rig performs the test directly through the same borehole used for coring, so teams can transition between soil testing and rock coring without repositioning equipment.
Geotechnical engineers use N-values to classify soil layers, estimate bearing capacity, and assess liquefaction potential. Having this capability built directly into the core drilling system means projects move faster — you get both core samples and geotechnical data from a single drill program.
Choosing the Right SPT Machine Model for Your Project
Selecting the right SPT rig for sale depends on your target depth, formation type, and site conditions. YG offers four standard models, each built on the same reliable full-hydraulic platform but scaled for different project requirements.
The YGX-400 SPT drilling machine handles drilling depths between 180 and 500 meters with a 78 kW Yuchai engine and 6-ton lifting force. Weighing just 4.3 tons, it works well for smaller exploration programs and sites with access constraints. The YGX-600 extends capacity to the 200–650-meter range with a 92 kW power plant and 16-ton lifting force, making it the most popular choice for mid-scale mineral and geotechnical projects.
For deeper programs, the YGX-800 reaches 400–1000 meters with 25 MPa rated pressure and a 12-ton feed force. The flagship YGX-1000 covers 500–1100 meters with a 154 kW Cummins engine and 30-ton lifting capacity, designed for large-scale exploration campaigns.
All four models support the SPT attachment and share the same core hydraulic architecture, so operators can move between units with minimal retraining. If you are evaluating an SPT drill rig for your fleet, consider your typical hole depth first, then match feed force and engine power to your formation hardness.
Why Partner with YG for Your Drilling Equipment?
When you source an SPT machine from YG Engineering, you get more than equipment — you get a manufacturer with years of experience in hydraulic drilling technology and a global support network. Every rig undergoes rigorous factory testing before shipment, and our engineering team provides commissioning assistance and operator training on request.
If you are looking for a reliable spt rig for sale with proven field performance and competitive pricing, send us your project specifications. Our engineers will recommend the optimal model configuration and provide a detailed quotation within one business day. Browse our full range of core drilling equipment or contact YG today to discuss your requirements and request a free project assessment.
