01Jaws Are a Wear Part
Jaws are replaceable working surfaces bolted to the body casting. Treating them as a wear part instead of part of the frame is the first step — a medium-duty bench vise should get years of hard gripping from its standard jaws, but the set is designed to be swapped when it finally wears.
To build a mental picture of the whole assembly including jaws, the parts explainer walks through each component.
02What Vise Jaws Are Made Of
Quality bench vises use hardened tool steel inserts: high-carbon bearing steel GCr15 and high-chromium cold-work steel Cr12MoV are the two common grades, heat-treated to 58-62 HRC. These are the same families used in cutting tools, and they keep a toothed face biting into work for years.
The wrong material — mild steel or soft cast — glazes, burrs and stretches under the pressure instead of holding.
03Hardened Faces, Striated Grip
Hard inserts carry the cross-hatched pattern that bites into the workpiece. The geometry of that gripping surface is covered in jaw design; the heat treating that reaches the hardness is covered in heat treatment.
04Hard vs Soft Jaws
Hard jaws hold and wear well on raw material. For finished or delicate work, replace the set with soft, plain or copper-backed jaws that protect the surface. Which body material sits behind them matters too — a rigid frame is what turns a hard jaw into a firm grip instead of a rocking one.
05Specifying Jaws for Your Program
Jaw grade, hardness, pattern and dimensions are all selectable when you build a product line. The OEM manufacturing route lets you choose the jaw set that matches your market without redesigning the body.