The C1621 is a high-performance HPHT sintered tapered diamond composite cutter for PDC drill bits. Integrating superior diamond wear resistance and carbide impact toughness, it effectively crushes hard formations, reduces downhole vibration, and improves bit stability and drilling efficiency. Ideal for medium-deep oil, gas and hard rock mining drilling, it is a top-selling 16mm series model for global drilling projects.Play
Parameter Table
| Model NO. | C1621 | Length | Standard |
| Type | PDC Cutter/Insert/Button | Material | Tungsten Carbide |
| Usage | Well Drilling, Oilfield,Gas Field,Mining Industry,Construction | Wear Resistance | Super High |
| Thermal Stability | 750℃,800℃,850℃,900℃ | Production Process | Hthp Sintering |
| Diamond Grade | PCD | Substrate Material | Tungsten Carbide |
| Total Height | 5~34 | Tolerance | ±0.02mm |
| Impact Toughness | Excellent | Certification | ISO 9001 |
| Shape | Round | Matched Drill Bit | PDC Drill Bits, Core Bits, Tricone Bits, Drill Pipes (We also offer custom drill bit manufacturing) |
| MOQ | 100PCS | Specification | 1621 |
| Transport Package | Customized, Carton/Wooden Case | Origin | China |
| Trademark | Ninestones | Production Capacity | 10000pieces/Year |
Applicable Strata
- Medium-Hard to Hard Interbedded Formations: Dense limestone, siliceous sandstone, fine quartz conglomerate layers, and fractured metamorphic rocks;
- Highly Abrasive Interbedded Formations: Formations containing chert interlayers, alternating soft and hard fractured shale, and densely cemented sandstone layers;
- Medium-to-Deep Oil and Gas Well Formations: Deep, dense reservoirs (2,500–5,000 m) and formations containing salt and gypsum interlayers;
- Mining Exploration Hard Formations: Medium-hardness granite, hard roof and floor strata associated with coal seams, and metallic ore vein interlayers.
Core Product Advantages
Excellent Wear Resistance
Ultra-fine high-purity diamond layer with low porosity delivers outstanding anti-abrasion performance in harsh abrasive hard formations, boosting single-run footage and minimizing costly trips for bit replacement.
Strong Impact Resistance
Integrated HPHT bonding combines diamond and tungsten carbide firmly. The cutter withstands abrupt impact from interbedded formations and stick-slip vibration, avoiding chipping or delamination.
Great Heat Resistance
High-stability diamond layer resists thermal damage under downhole high temperature, maintaining stable cutting performance in deep hot well drilling.
High Compressive Strength
Premium WC matrix bears heavy drilling pressure, preventing base deformation under high-load hard-rock drilling.
Efficient Rock Breaking
Matched with standard R2 spherical crown, the generous exposed height concentrates drilling pressure to crush compact hard rock efficiently and improve ROP obviously.
Universal & Cost Saving
CNC finished with tight dimensional tolerance, compatible with all standard PDC bits; superior performance cuts spare parts and downtime expenses greatly.
Precise Size Specifications
C1621 Specs: OD 15.880 mm, total height 21.000 mm, head SR 2.0 mm, effective exposed cutting height 7.9 mm after brazing. Sharing identical production technology with C1420, C1421 and C1925, it features a favorable 7.9mm exposed height for superior rock penetration. Proven globally across countless deep oil, gas and mining wells, it is the preferred all-round option for hard rock drilling.
Material and Core Technology
Core Material
Premium ultra-fine synthetic diamond powder for cutting face and customized cobalt tungsten carbide as substrate, balancing high abrasion resistance and robust anti-impact performance.
HPHT Integrated Sintering Process
Formed under ultra-high pressure and over 1500℃ via cubic press equipment for atomic-level metallurgical combination to prevent diamond layer falling off.
5-Axis Precision Grinding
Precise machining of cone and spherical surface with tolerance under 0.02mm to avoid local stress concentration and unexpected tooth breakage.
Application Field
Oil & Gas Drilling
Suitable for shallow to medium-deep well operations on land. Works well in tight sandstone, interbedded strata and gravel-bearing formations. High temperature resistance avoids carbonization and delamination, reducing bit replacement and overall drilling cost.
Mining Drilling & Exploration
Ideal for mineral prospecting, tunnel drilling and mine water well projects. Perfect for high-abrasive hard rock such as granite and quartzite. Excellent impact resistance prevents edge chipping, serving longer life in fractured mining formations.
Geological Exploration & Sampling
High dimensional accuracy ensures stable drilling and regular borehole. Guarantees complete formation core sampling, fully meeting high-precision geological survey and resource exploration requirements.
Water Well & Infrastructure Engineering
Widely used in deep water wells, pile foundation drilling and construction projects. Efficient penetration in common rock layers, low wear and stable performance for long-time continuous site operation.
Universal Bit Matching
Compatible with mainstream PDC bits, core bits and drilling tools with good interchangeability. Custom sizes and chamfers are available to meet non-standard matching demands for different projects.
Customized Service
We provide full customization for PDC cutters of all specifications, covering outer diameter, overall height, PCD layer thickness, chamfer style and other technical parameters.
Standard sizes are always in stock. For non-standard dimensions, special chamfers, customized wear resistance grades and logo engraving, we offer personalized solutions tailored to formation conditions, bit structure and equipment matching requirements.
With independent production lines, we accept sample orders, bulk orders and OEM services. Strict dimensional tolerance control and stable delivery lead times fully meet the personalized product demands of various drilling projects.
| Cutter Model | Diameter/mm | Total Height/mm | Height of Diamond Layer | Chamfer of Diamond Layer |
| C0606 | 6.421 | 6.350 | 2 | 2.4 |
| C0609 | 6.400 | 9.300 | 1.5 | 3.3 |
| C1114 | 11.176 | 13.716 | 2.0 | 5.5 |
| C1210 | 12.000 | 10.000 | 2.0 | 6.0 |
| C1214 | 12.000 | 14.500 | 2 | 6 |
| C1217 | 12.000 | 17.000 | 2.0 | 6.0 |
| C1218 | 12.000 | 18.000 | 2.0 | 6.0 |
| C1310 | 13.700 | 9.855 | 2.3 | 6.4 |
| C1313 | 13.440 | 13.200 | 2 | 6.5 |
| C1315 | 13.440 | 15.000 | 2.0 | 6.5 |
| C1316 | 13.440 | 16.500 | 2 | 6.5 |
| C1317 | 13.440 | 17.050 | 2 | 6.5 |
| C1318 | 13.440 | 18.000 | 2.0 | 6.5 |
| C1319 | 13.440 | 19.050 | 2.0 | 6.5 |
| C1420 | 14.300 | 20.000 | 2 | 6.5 |
| C1421 | 14.870 | 21.000 | 2.0 | 6.2 |
| C1621 | 15.880 | 21.000 | 2.0 | 7.9 |
| C1925 | 19.050 | 25.400 | 2.0 | 9.8 |
| C2525 | 25.400 | 25.400 | 2.0 | 10.9 |
| C3028 | 29.900 | 28.000 | 3 | 14.6 |
| C3129 | 30.500 | 28.500 | 3.0 | 14.6 |
Customer Reviews
Mark Wilson | Oilfield Drilling Project Manager
We have been using their 16mm PDC cutters for a long time. They perform steadily in hard formations with much better wear resistance than other brands. Cutter chipping is greatly reduced, which effectively cuts down our overall drilling cost. Highly reliable for long-term cooperation.
Carlos Rodriguez | Mining Drilling Engineer
Our working conditions are tough with granite and fractured formations. These PDC cutters have excellent impact resistance and longer service life. The dimension accuracy is perfect, fits our drill bits very well without repeated adjustment.
David Brown | Infrastructure & Water Well Contractor
Great customization service for non-standard sizes and special chamfers. Delivery is always on time. The cutters hold up well under continuous high-intensity site operation, fast penetration and low consumption, fully matching our construction schedule.
Packaging
Each PDC cutter is individually shockproof protected to avoid collision and wear. Adopt moisture-proof and pressure-resistant carton packaging, wooden box customization is available for bulk orders, safe for long-distance transport.
Delivery
Sample and bulk orders are acceptable. We support express, air freight and sea freight. Sufficient production capacity ensures stable lead time, safe and on-time delivery worldwide.
FAQ
Q: How do I distinguish between and select the appropriate model among C1621, C1421, and C1925?
A: All three models are R2 spherical standard conical cutters. The C1421 features an outer diameter of 14.87 mm and a protrusion height of 6.2 mm, making it suitable for soft-to-medium-hard formations at shallow-to-intermediate depths. The C1621 features an outer diameter of 15.88 mm and a protrusion height of 7.9 mm, making it suitable for hard rock formations at intermediate-to-deep depths. The C1925 features an outer diameter of 19.05 mm and a protrusion height of 9.8 mm, making it ideal for ultra-hard granite and large-diameter mining drill bits; for deep-well drilling in hard rock, the C1621 is the preferred choice.
Q: Can the C1621 be brazed onto both steel-body and matrix-body drill bits?
A: It is fully universal. The product’s outer diameter tolerances are standardized, allowing it to be secured via copper brazing into the cutter pockets of steel-body PDC bits, while also being compatible with the powder metallurgy cutter-setting process used for matrix-body bits—all without requiring any modification to the drill bit’s cutter pocket dimensions.
Q: How does the C1621 perform in terms of high-temperature resistance? Can it be used for high-temperature deep-well drilling?
A: The thermal stability temperature of the diamond composite layer reaches up to 750°C. This fully meets the requirements for high-temperature drilling in deep wells (up to 4,500 meters) under standard downhole circulating drilling fluid conditions. For ultra-high-temperature geothermal wells, a customized version featuring a high-temperature-resistant modified diamond formula is available upon request.