How to choose a bench vise - which jaw width fits?
A parallel bench vise holds the workpiece while you drill, file or saw. This guide explains how to size jaw width and opening capacity, when a swivel base pays off and how cast iron differs from forged steel.
View bench visesHow do I determine jaw width and opening capacity?
The two key dimensions are the jaw width (length of the clamping jaws) and the opening capacity (maximum opening). Jaw width sets how wide the workpiece can rest, opening capacity how thick it may be. Rule of thumb: 75‑100 mm for model making and precision work, 125‑150 mm for the general workshop, 150 mm and up for heavy metalwork.
On most bench vises the opening capacity runs from 100 to 200 mm. Also mind the jaw depth: deep jaws hold tall workpieces securely, while shallow jaws make bulky parts harder to clamp.
When is a swivel base worth it?
A swivel base lets the vise rotate up to 360° and lock in any position. That brings the workpiece into better light and a comfortable working height without re-clamping. For filing, sawing and deburring it saves a lot of time.
- Swivel base: freely orientable, ideal for changing workpieces and a cramped bench.
- Fixed base: stiffer and usually cheaper, transfers hammer blows better when straightening.
- Two locking bolts hold the turntable without play - with a single bolt, check that it holds under load.
- For hammering and heavy straightening a fixed or very solidly bolted base is the better choice.
Cast iron or forged steel - which is better?
Most bench vises are made of grey cast iron (GG20/GG25). Cast iron is highly compression-resistant, dampens vibration well and is inexpensive - but brittle: hard hammer blows to the body can crack it. Forged steel is tough and virtually unbreakable, but heavier and more expensive.
Regardless of the body, the clamping jaws should be hardened steel with a cross-knurled face so the workpiece does not slip. For delicate surfaces there are clip-on protective jaws in aluminium, copper or plastic.
Frequently asked questions
What jaw width do I need for a home workshop?
For most home and hobby workshops a vise with 100 to 125 mm jaw width is ideal. It clamps securely and fits a standard workbench.
Is a cast iron vise less stable?
Cast iron is very compression-resistant and dampens vibration, but brittle under hard blows. For normal clamping, filing and sawing it is plenty; for heavy straightening with a hammer, forged steel is more robust.
How do I mount the vise correctly?
The base is bolted through the bench top with three or four bolts, ideally with washers underneath. The front edge of the jaws should sit flush with the table edge so long workpieces can be clamped vertically.
What are protective jaws for?
Protective jaws in aluminium, copper or plastic clip over the knurled steel jaws and prevent pressure marks on soft or polished surfaces.
Looking for the right bench vise?
We stock parallel bench vises in grey cast iron and forged steel in all common jaw widths - with fixed or swivel base and hardened clamping jaws.
Rugged quality
Cast and steel models with hardened jaws.
Every size
Jaw widths from 75 to 200 mm available.
Fixed or swivel
The right base for every workplace.
Expert advice
We help you size the vise correctly.