Punches and chisels are some of the oldest tools in the box, and you will still use them every day. Roll pins, hinge pins, alignment, cutting off a rusted fastener, cleaning up weld spatter, breaking a stubborn piece loose. They look simple. But the wrong punch or chisel can ruin a part, mushroom a pin, or send a chip of steel somewhere you do not want it.

We carry a full range of Genius pin punches and flat chisels in metric and SAE. Here is how to pick the right one, what the specs on the product pages mean for you, and the habits that keep everyone safe.

Pin punches: matching the tip to the pin

A pin punch has a straight, flat tip sized to drive out a pin without expanding it. The spec that matters most is tip diameter. Pick a punch close to the pin size but not bigger than the hole, so it can follow the pin through.

Two examples from our line:

Per the product pages, both are Chromium Molybdenum alloy steel, heat treated, with a corrosion-resistant coating, and meet or exceed ANSI standards.

Metric vs SAE punches

Like sockets and hex bits, punches come in both systems. Our line includes metric pin punches from 2mm up to 8mm and SAE punches in sizes like 1/16, 3/32, 1/8 and 5/32 inch. Why it matters: a punch a little too small can slip off the pin and mar the hole. A punch a little too big will not go through.

If your shop works on domestic and imported equipment, keep both sets. They do not cost much, and the right size saves the part.

Length: reach vs control

Pin punches come in different lengths for the same tip size. Our 5mm and 6mm metric punches, for example, come in 160mm and 200mm versions. The tradeoff:

  • Shorter punch: more control, less flex. Better for starting a stuck pin.
  • Longer punch: more reach, for pins that sit deep or behind other parts.

A common approach: start a stuck pin with a starter punch or a short pin punch, then switch to a longer pin punch to drive it the rest of the way.

Flat chisels: width and length

A flat chisel cuts, shapes and removes material. The specs that matter are blade width and overall length. Our line runs from narrow chisels like 6mm up to 25mm, in lengths from about 125mm to 300mm.

The 561612 12mm flat chisel is a good middle example. It has a 12mm edge, a 150mm length, Chromium Molybdenum alloy steel, and an impact-resistant plastic handle with an integrated ring that helps keep it from rolling when you set it down.

How to pick:

  • Narrow chisels concentrate force. Use them for cutting off small fasteners, cleaning tight corners, and detail work.
  • Wider chisels cover more surface. Use them for scraping, splitting and larger material removal.
  • Longer chisels keep your hand farther from the strike zone and reach into deeper spots.

Hex shank chisels with a handle guard

For heavy, repeated striking, use a chisel with a guard. The 563819P 19mm flat chisel has a 5/8 inch hex shank, a handle guard, and a 380mm overall length. The product page notes the hex shank helps keep the chisel stable and in position, and the guard helps protect your hand during impact use.

For production work, construction, or any job where you will be swinging at a chisel for a while, you will be glad of that guard by the third hour.

Striking safety basics

This is the part people skip. Do not skip it:

  • Wear eye protection. Every time. Chips fly when you strike steel.
  • Dress mushroomed heads. When the struck end of a punch or chisel spreads out, pieces can break off and fly. Grind it back to shape or replace the tool.
  • Use the right hammer. A ball peen hammer is the usual choice for punch and chisel work. We covered hammer selection in are you using the right hammer.
  • Keep the tool square to the work. Glancing blows are how punches slip and fingers get hit.
  • Do not use a screwdriver as a chisel. It is not made for it, and the handle or tip can fail.

Common jobs and the right tool

A quick cheat sheet:

  • Driving out roll pins and solid pins: pin punch matched to pin size.
  • Lining up holes: an alignment or long taper punch, or a pin punch to hold position.
  • Cutting a rusted nut or bolt head: a narrow flat chisel, with eye protection.
  • Removing weld spatter or scale: a wider flat chisel.
  • Heavy repeated striking: a guarded hex shank chisel.

Starter punches, taper punches and pin punches

People use the word punch for a few different tools, so get them straight. A starter punch has a short, stout tip made to take the first hard hits on a stuck pin. A taper or alignment punch narrows along its length and is used to line up holes. A pin punch has a straight shaft that follows the pin through the hole once it is moving. The pin punches in this post are that last type. Start a seized pin with a long, thin pin punch and you will bend it. If a pin is fighting you, start it with something stouter and switch once it moves.

Storage and care

Punches and chisels last a long time if you treat them right:

  • Keep them in a holder or roll so the tips do not bang against each other.
  • Wipe them down and keep the coating intact to resist corrosion.
  • Touch up chisel edges when they dull. A dull chisel takes more force and is more likely to slip.
  • Retire bent punches. A bent punch will not drive straight.

For fleets, plants and government shops

Striking tools are in almost every maintenance kit, and they are one of the most neglected categories. In plants and government facilities with safety programs, mushroomed heads are a common audit finding. Replacing them on a schedule with a consistent, labeled set makes that easier to manage. Our striking tools section covers the full range.

For resellers and supply houses

Punches and chisels sell as sets and as singles. Sets go to new techs. Singles replace the sizes that wear out or go missing. Small-diameter pin punches get bent and replaced often, so keep those well stocked.

Warranty and value

Genius punches and chisels are backed by the Genius Tools Limited Lifetime Warranty against manufacturer defects. That covers defects, not misuse or wear such as mushrooming from normal striking.

Professional-grade CR-Mo striking tools at a reasonable price make it easy to replace worn tools when you should, instead of stretching them past the point where they are safe.

FAQ

How do I pick a pin punch size?

Pick a tip close to the pin diameter but small enough to follow the pin through the hole.

What are Genius punches made of?

The pages list Chromium Molybdenum alloy steel, heat treated, with a corrosion-resistant coating.

Why does a hand guard matter on a chisel?

It helps protect your hand during repeated striking, as noted on the 563819P page.

What hammer should I use?

A ball peen hammer is the common choice for punch and chisel work.