W110 is a plain high-carbon water-hardening tool steel in the same naming family as SAE designations W108, W109, and W112 — a convention where the trailing digits point to the target carbon content, in this case roughly 1.10%. Like every grade in the W1 water-hardening family, W110 relies on carbon alone (with only trace alloying) to develop hardness, which means it hardens fast and deep only in thin sections and requires a fast water quench to reach full working hardness. That simplicity is both the appeal and the limitation of water-hardening tool steels: low cost and excellent as-quenched hardness at the surface, but shallow hardenability and more distortion risk than an oil- or air-hardening grade of comparable final hardness.

At the higher end of the W-series carbon range, W110 is suited to tooling that needs maximum surface hardness and wear resistance in thin sections — files, chisels, small punches, blanking dies, and similar tools where a hard case with good edge retention matters more than section toughness. Because the core stays comparatively soft and tough even after a water quench (a natural result of shallow hardenability), thin W110 tools combine a hard, wear-resistant edge with a shock-absorbing core, which is exactly the profile many hand and light production tools need.

In the annealed condition, W110 machines similarly to a high-carbon 1090-1095 class carbon steel — no alloy carbides to contend with, but the high carbon content does raise hardness and abrasiveness somewhat above a mid-carbon grade even before hardening. Almost all shaping and roughing happens in this annealed state; the water-quench hardening step comes after the bulk of machining, with only finishing or grinding done on the hardened tool.

Because there's no chromium, vanadium, or tungsten to refine grain structure or add secondary hardening, chip formation in the annealed condition is generally predictable with a standard chipbreaker geometry, though the higher carbon content compared with lower-carbon W-series grades makes the material somewhat more prone to work hardening under a dull edge or light, rubbing cuts.

A sharp, wear-resistant coated grade run at moderate speed with consistent feed engagement gives the best combination of tool life and finish. Avoid prolonged dwell or light finishing passes with a dull edge, since that's where high-carbon steels like this one are most likely to work-harden and complicate the next pass.