PDC Cutter Essentials: How to Choose the Right Polycrystalline Diamond Compact for Your Drilling Project

When it comes to modern drilling and rock cutting, the PDC cutter is one of the most transformative components in the industry. These small but powerful discs — made from a layer of polycrystalline diamond bonded to a tungsten carbide substrate — are the cutting edge of every PDC drill bit. Whether you are drilling water wells, conducting geological exploration, cutting stone in a quarry, or manufacturing drill bits yourself, understanding how to ｓｅｌｅｃｔ the right PDC cutter can make the difference between a profitable operation and costly downtime.

At Xi'an Heaven Abundant Mining Equipment CO.,LTD (TY Drill Bits), we have been supplying PDC cutters and drilling consumables to international buyers since 2010, with exports accounting for over 90% of our business. This guide draws on that experience to help you navigate cutter sizes, shapes, and quality grades so you can make an informed purchasing decision.

What Is a PDC Cutter and How Does It Work?

A PDC cutter — short for Polycrystalline Diamond Compact cutter — is a synthetic diamond cutting element. It consists of a thin diamond table (typically 0.5 to 2 mm thick) sintered onto a thicker tungsten carbide substrate under extreme heat and pressure. The diamond layer provides exceptional hardness and wear resistance, while the carbide backing absorbs impact and provides structural support.

When mounted on a PDC drill bit, these cutters shear through rock formations rather than crushing them — a mechanism fundamentally different from roller cone bits. This shearing action requires less weight on bit, generates less heat, and often results in penetration rates three to five times faster than conventional tools in suitable formations. The same cutters are also used in chain saw segments for stone quarrying, in mining picks, and in various rock drilling tool assemblies.

Common PDC Cutter Sizes and Their Applications

PDC cutters are identified by their diameter and total height, usually expressed in millimeters. The most common sizes you will encounter on the market are listed below, along with what each size is typically used for.

The 1308 size is the workhorse of the industry. At TY Drill Bits, we stock 1308 cutters in both new and used grades, with and without shanks, to serve customers across multiple applications. The 0808 and 1313 sizes are also available for operations that need smaller or larger cutting elements.

New vs. Used vs. Scrap PDC Cutters: Which Grade Do You Need?

One of the most frequent questions we receive from buyers is about the difference between new, used, and scrap PDC cutters — and which one is right for their operation. The answer depends on your application, your budget, and the level of performance you require.

New PDC Cutters

New cutters come straight from the sintering process with a full diamond table and intact chamfer. They deliver the highest cutting efficiency and longest service life. If you are manufacturing new PDC drill bits for water well or oil drilling, or if you need consistent, predictable performance in hard rock, new cutters are the recommended choice. TY Drill Bits supplies new PDC cutters including the 0804, 0808, 1308, and 1313 sizes, with polycrystalline diamond compact quality that meets industry standards.

Used PDC Cutters

Used PDC cutters are recovered from retired drill bits that still have usable diamond material remaining. These cutters are inspected, sorted, and sold at a fraction of the cost of new ones. They are an excellent option for stone cutting operations — where the diamond edge is used to saw through granite, marble, or other hard stone — and for quarry chain saw applications where absolute precision is less critical than cost-effectiveness. Many stone processors in China and abroad prefer used 1308 PDC cutters specifically for this reason: they deliver acceptable cutting performance at a significantly lower price point.

Scrap PDC Cutters

Scrap PDC cutters are those with extensive wear or partial diamond loss, typically sold for recycling or for very low-cost applications where some residual diamond cutting ability is still useful. At TY Drill Bits, we offer scrap PDC cutters in 1308, 1313, and 1613 sizes for buyers who need an ultra-economical option or who intend to reprocess the tungsten carbide substrate.

PDC Cutters for Stone Cutting and Quarry Operations

Beyond drill bit manufacturing, PDC cutters have found a strong second market in the stone processing industry. Cutters with shanks — particularly the 1308 size — are mounted onto chain saw segments used to cut granite, marble, and limestone blocks directly from the quarry face. The diamond table shears through stone cleanly, producing straight cuts with less waste than traditional wire saw methods in certain applications.

TY Drill Bits supplies both new and used PDC cutters with shanks specifically for stone cutting applications. Our used 1308 cutters with shanks are one of our most popular products among stone processors looking for a cost-effective cutting solution. For quarry operations that consume large volumes of cutters, the savings from choosing used over new cutters can be substantial over the course of a year.

How to Evaluate PDC Cutter Quality

Not all PDC cutters are created equal. When sourcing cutters, pay attention to these quality indicators:

• Diamond table thickness. A thicker diamond table means longer service life. Standard thickness ranges from 0.5 mm to over 2 mm. For abrasive formations, choose cutters with thicker diamond tables.
• Chamfer integrity. The chamfer — the beveled edge around the diamond table — is critical for impact resistance. A well-formed chamfer can double the cutter's resistance to fracture. Inspect cutters for chipped or missing chamfers before purchasing.
• Bond quality. The interface between the diamond layer and the tungsten carbide substrate should be clean and free of visible defects. A poor bond leads to delamination and premature failure.
• Consistency of size. For drill bit manufacturing, all cutters on a single bit should be within tight dimensional tolerances to ensure uniform loading and balanced cutting.
• Supplier reputation. Work with a supplier who has a track record in the drilling industry and can provide consistent quality batch after batch. TY Drill Bits has been serving the international market since 2010, with ISO9001-certified quality management.

Why Source PDC Cutters from TY Drill Bits?

As a manufacturer and trading company based in Xi'an, China, TY Drill Bits occupies a unique position in the PDC cutter supply chain. We are not a distant distributor adding markup — we are directly engaged in the production and procurement of drilling consumables. This gives our customers several advantages:

Frequently Asked Questions About PDC Cutters

Can I use PDC cutters on any type of rock?

PDC cutters perform best in soft to medium-hard formations such as shale, limestone, sandstone, and claystone. In very hard or highly abrasive formations like granite or quartzite, cutter wear accelerates. For these conditions, consider using cutters with thicker diamond tables, or evaluate whether a roller cone bit with tungsten carbide inserts might be more suitable. TY Drill Bits can advise on the right cutting tool for your specific formation.

What is the difference between a PDC cutter and a PDC ｉｎｓｅｒｔ?

The terms are often used interchangeably in the industry. Generally, "PDC cutter" refers to the standalone diamond compact element, while "PDC ｉｎｓｅｒｔ" may refer to the same element once it is brazed or mounted into a drill bit body. At TY Drill Bits, we use both terms to describe the same product range — the polycrystalline diamond compact cutting elements sold for drill bit manufacturing, stone cutting, and other applications.

How do I know if used PDC cutters are still good?

A visual inspection is the first step: look for intact diamond tables without large spalls or delamination. The cutter should show a consistent wear pattern rather than catastrophic fracture. At TY Drill Bits, we grade our used and scrap cutters before shipping so buyers know exactly what quality level they are receiving. For precision applications, we recommend testing a sample batch before committing to a large order.