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A2 Stainless Steel Torx Cap Screws

A2 Stainless Steel Torx Cap Screws

A2 stainless steel Torx cap screws have a cylindrical head with a six-lobe socket, also called a hexalobular or Torx drive, that you turn with a Torx key. Made to ISO 14579, they share the same socket cap head as a DIN 912 hex screw, just with a Torx drive in place of the hex socket. A2 is the general-purpose stainless grade that handles most indoor and outdoor work. We stock them in M3 to M6, with no minimum order.

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About A2 Stainless Steel Torx Cap Screws

What they are

A2 stainless steel Torx cap screws have a cylindrical head with a recessed six-lobe socket, turned with a Torx key rather than an Allen key. The six-lobe drive is also called hexalobular, but Torx is the common trade name for it. They are made to ISO 14579, the standard for hexalobular socket head cap screws, and the drive shape itself is set by ISO 10664. The head is the same socket cap form as a DIN 912 screw, so if you know cap head bolts, these are the same screw with a Torx drive instead of a hex socket.

Where they're used

The internal drive lets you tighten them in tight spaces, or sink them into a counterbored hole so the head sits flush or below the surface, the same as any socket cap screw. The main benefit with these is the Torx drive, it grips the tool on all six lobes, so it transfers more torque and is far less likely to cam out and slip than a hex key, which makes it a favourite on production lines, powered tools and anywhere a screw gets driven again and again. The A2 stainless finish also makes them a tidy, rust-resistant choice for work on show or out in the weather.

The Torx drive

Torx, or hexalobular to give it the proper name, is a six-lobe star pattern rather than the six flats of a hex socket. Because the tool touches the screw over a wider area, it can carry more torque with less downward push and much less slipping, which saves rounded-out heads and chewed tools. You will see these cross-referenced as DIN 912 Torx, because the head matches the familiar DIN 912 cap screw and only the drive changes. If you would rather have the same A2 stainless in a hex drive, our A2 socket cap screws are the Allen-key version. For general use A2 stainless is the everyday grade, and for coastal or salty work A4 stainless is the tougher pick.

Sizes

We stock A2 stainless Torx cap screws in M3, M4, M5 and M6, in many lengths, with no minimum order so you can buy the exact quantity you need. If you need a Torx cap head bolt in a size or length we do not list, give us a shout and we can usually source it. For head and drive dimensions, head to our cap head bolt dimensions guide.

A2 Torx Cap Screw FAQs

It is a socket cap screw with a six-lobe drive instead of the usual hex socket. Six-lobe is also called hexalobular, and Torx is the common name for it. The head is the same cylindrical cap head you get on a standard cap screw, so it sinks into a counterbore the same way, it is just turned with a Torx key rather than an Allen key.

Almost. They share the same socket cap head as a DIN 912 screw, so they look and fit like a familiar cap head bolt. The difference is the drive: DIN 912 has a hex (Allen) socket, while these have a Torx six-lobe socket and are made to ISO 14579. That is why you will see them cross-referenced as DIN 912 Torx.

The tool grips on all six lobes, so it transfers more torque with less downward pressure and is far less likely to slip or cam out. That means fewer rounded heads and chewed-up tools, which is why Torx is popular on production lines and anywhere a screw is driven with a powered tool.

It depends on the screw diameter, the Torx size steps up as the screw gets bigger. Rather than guess, check the size marked on the screw or listing, or our dimensions guide, which lists the Torx size against each screw.

Yes. A2 stainless handles general outdoor use and copes fine with damp and rain. For coastal, marine or chemical environments where salt is in play, A4 stainless is the better choice.

Yes. Our Torx cap screws are made to ISO 14579, the standard for hexalobular socket head cap screws, with the six-lobe drive shape set by ISO 10664.