Sandvik CoroDrill 460 vs OSG EXOPRO WX: Solid Carbide Drill Performance Compared for Steel and Stainless Steel

Solid carbide drilling is the single most punishing operation in a CNC program. The tool is buried in the workpiece, chip evacuation is obstructed by geometry rather than helped by it, and the cutting edges at the chisel point see near-zero surface speed while the outer corner runs at maximum. Two drills dominate the premium end of this market for ISO P and ISO M work: the Sandvik CoroDrill 460 and the OSG EXOPRO WX series. They solve the same problem with genuinely different engineering philosophies, and choosing between them comes down to how your shop balances hole quality, cycle time and process security.

The Short Answer

The CoroDrill 460 is the stronger choice when hole position and roundness tolerances are tight, when you run long-chipping low-carbon steels, and when you need a single drill platform covering 3xD through 8xD depths. The OSG EXOPRO WX is the better fit for stainless and heat-resistant alloys where edge stability and heat resistance matter more than absolute metal removal rate, and for shops already standardized on OSG’s tool holder and regrinding ecosystem.

Both are 140-degree point angle, through-coolant, h6-shank drills in the 3–20 mm range. The differences live in the details: web thickness, margin design, coating architecture and the way each manufacturer specifies feed versus diameter.

Design Architecture Compared

Sandvik CoroDrill 460

The CoroDrill 460 is built around a robust, thick-web carbide body with a PVD multilayer coating optimized for steel. Its distinguishing feature is a generously relieved flute that prioritizes chip evacuation volume over body rigidity — a deliberate trade that lets the drill survive the stringy chips typical of low-carbon and free-machining steels. The margin is narrow and polished, which reduces friction against the hole wall and helps hold roundness in deep holes.

The platform is unusually broad for a single family. Standard variants cover 3xD, 5xD and 8xD in both internal-coolant and external-coolant configurations, plus a dedicated aluminum variant with a polished flute and different geometry. Diameters run from 3.00 mm to 20.00 mm in 0.1 mm steps, which matters in mold and die work where nominal holes rarely land on an integer.

OSG EXOPRO WX

OSG’s EXOPRO WX takes the opposite priority: maximum body stiffness and edge strength. The web is thicker for a given diameter, the helix is shallower in the stainless-optimized variants, and the WX coating is a multi-layer TiAlN-based PVD with a pronounced heat-resistance bias. The result is a drill that cuts slightly slower but sustains its edge far longer in work-hardening materials.

The WX family is commonly deployed as two sub-variants: a general steel version and a stainless/high-alloy version with a more heat-resistant coating and modified chisel geometry. Internal coolant is available across the range and is effectively mandatory above 5xD.

Specification Comparison

Note that the tool tolerance class matters more than the nominal diameter in production. A 10.00 mm drill ground to h6 will produce a hole roughly 10.02–10.06 mm in steel at normal parameters; if you need a 10H7 bore, plan on reaming or boring after drilling with either tool.

Coating Technology

Sandvik’s coating on the 460 is a thin, hard multilayer designed to resist abrasive wear in steel while maintaining a low friction coefficient at the flank. Because it is thin, it transmits the substrate’s toughness well — the edge resists chipping during entry and breakthrough, which is where most drill failures originate. In practice, CoroDrill 460 tools tend to fail by progressive flank wear rather than catastrophic edge breakage in carbon steel.

OSG’s WX coating is thicker and more thermally stable. The trade-off is measurable: in stainless, the extra layer delays the diffusion and adhesion wear mechanisms that dominate at 304/316 cutting temperatures, so the edge holds its geometry longer. In plain carbon steel, that extra thickness buys little and slightly increases friction, which is why the WX is usually specified with marginally lower surface speeds than the Sandvik drill in ISO P.

Neither coating tolerates running dry above 3xD. Through-coolant is not a convenience with these tools; it is the chip evacuation mechanism and the cooling path for the chisel edge.

Cutting Data: Carbon Steel (ISO P, ~180 HB)

The table below gives starting parameters for a rigid setup — 40 taper or HSK-A63 machine, hydraulic or shrink-fit holder, runout under 0.02 mm at 3xD and under 0.03 mm at 5xD. Reduce by 20–30 percent for long-reach or thin-wall work.

The CoroDrill 460 runs roughly 10–15 percent higher surface speed and 5–10 percent higher feed at the same diameter in carbon steel. That translates into a 20–25 percent shorter drilling cycle before any tool-life consideration. Whether that cycle-time advantage survives depends entirely on how the shop manages chip evacuation — a starved coolant supply will erase the gain and then some.

Cutting Data: Stainless Steel (304 / 316, ISO M)

In stainless the two drills converge far more closely than they do in carbon steel. The gap is 5–8 percent on surface speed, and OSG’s stability advantage shows up as repeatability rather than rate: at 5xD in 316, users typically report fewer edge-chipping events and a more predictable wear progression, which is worth more than a marginal Vc difference when a broken drill scraps a near-finished part.

Chip Control and Coolant Strategy

Drilling failures in steel split into two failure modes. In low-carbon steel, chips are long and stringy; they pack the flute and torque spikes. In stainless, chips are gummy and work-harden the hole wall if the drill dwells.

For the CoroDrill 460 in carbon steel, the open flute geometry handles long chips provided coolant pressure is adequate — target 20–25 bar through-tool, not the 5–8 bar many shops assume is sufficient. Low pressure with a high-volume flute is the worst combination: chips are produced faster than they are flushed.

For the EXOPRO WX in stainless, keep the feed above 0.08 mm/rev at all times. Any hesitation below the cutting-edge radius raises the specific cutting pressure, work-hardens the surface and accelerates flank wear. If your control does not support through-spindle coolant, program a peck cycle of one diameter for the first two pecks, then full depth; the CoroDrill 460 tolerates interrupted pecking slightly better because its relieved flute clears chips on retraction.

• Entry: reduce feed to 50 percent for the first 1 mm to damp vibration.
• Breakthrough: reduce feed to 50–60 percent for the last 0.5 mm to prevent corner chipping.
• Spot drilling: use a 140° spot or a 142° chamfer tool; do not spot with a 90° drill and then feed a 140° drill into it.
• Runout: keep under 0.02 mm at 3xD. Runout is the number-one cause of oversize holes and premature corner wear.

Hole Quality and Positional Accuracy

A drill is a roughing tool, but its hole quality determines whether you need a second operation. In 3xD carbon steel at the parameters above, the CoroDrill 460 typically holds IT8–IT9 with roundness within 0.02–0.03 mm at 8–12 mm diameter. The EXOPRO WX lands closer to IT9–IT10 with comparable or marginally better straightness in deep holes, largely because the thicker web deflects less under thrust.

At 5xD, both drills drift. Expect 0.05–0.10 mm position error at 5xD in steel and up to 0.15 mm in stainless if the pre-drilled spot is shallow. Any bore requiring H7 tolerance should be drilled 0.3–0.5 mm undersize and finished by boring or reaming.

Where Each Drill Wins

Programming Notes That Apply to Both

Most drill failures attributed to the tool are actually process failures. Three items are worth standardizing regardless of brand:

• Coolant volume, not pressure alone. Through-tool coolant needs flow to carry chips, and pressure to keep them moving. Check actual delivery at the drill, not at the pump gauge.
• Pre-hole geometry. A spot hole that is too large or too deep lets the drill walk; a spot hole that is too small causes the chisel edges to rub. Match the spot diameter to roughly 0.9× drill diameter and keep its depth under 0.5× diameter.
• Holder rigidity. A hydraulic or shrink-fit holder removes the biggest variable. A standard collet chuck is acceptable only below 8 mm diameter at 3xD, and only with verified runout.

Both manufacturers publish application-specific parameter charts that override the starting values here for particular material conditions. Treat the tables above as commissioning numbers, then adjust in the direction the chips and wear pattern indicate: darker chips and edge discoloration mean reduce speed; chipped corners mean reduce feed at entry and breakthrough.

Final Selection Logic

If your shop runs mixed steel and stainless and can only standardize on one premium drill family, the CoroDrill 460 is the more versatile platform — its depth range, diameter granularity and steel-optimized evacuation make it the default. If stainless and high-alloy work dominate your workload, or if you are already invested in OSG’s holder and regrinding ecosystem, the EXOPRO WX delivers the process security that matters more than a few percentage points of surface speed. In practice, many production shops stock both: the 460 for carbon steel and deep holes, the WX for 316 and duplex grades. That split is not indecision — it is recognizing that drilling is the operation where a 10 percent rate difference is worth far less than a predictable tool life curve.