Home » A2 Stainless Steel Socket Cap Screws - Cap Head Bolts
A2 Stainless Steel Socket Cap Screws - Cap Head Bolts

A2 Stainless Steel Socket Cap Screws - Cap Head Bolts

A2 stainless steel socket cap screws, also called cap head bolts or Allen bolts, have a cylindrical head with an internal hex drive that you tighten with an Allen key. Made to the DIN 912 standard, also known as ISO 4762, A2 is the general-purpose stainless grade that handles most indoor and outdoor work. We stock them across a range of metric sizes, with no minimum order.

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About A2 Stainless Steel Socket Cap Screws

What they are

A2 socket cap screws have a cylindrical head with a recessed hex socket, driven by an Allen key. A2 is the general-purpose austenitic stainless grade, broadly the same as 304 stainless, so it gives good corrosion resistance for everyday jobs. They are made to DIN 912, the international equivalent of ISO 4762, the same standard used across our socket cap screws range.

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 stainless finish makes them a tidy, rust-resistant choice for work that is on show or out in the weather. You will find A2 cap head bolts on machinery, bikes, trailers, garden and outdoor builds, and general assembly where a clean look and corrosion resistance both matter.

Choosing a grade

A2 stainless is the everyday choice. It handles general indoor and outdoor use and copes with damp and rain without much fuss. If the job is near the coast or around salt or chemicals, A4 stainless is the tougher pick. And where raw clamping strength matters more than corrosion resistance, 12.9 high-tensile is the one. Not sure which suits your job? Our grade guide runs through it.

Sizes

We stock A2 socket cap screws across a range of metric diameters, from M1.6 up to M12, in plenty of lengths. Shorter lengths are fully threaded and longer ones come partially threaded as standard. There is no minimum order, so you can buy the exact quantity you need. For the full sizing tables and a downloadable PDF, head to our cap head bolt dimensions guide.

A2 Socket Cap Screw FAQs

A2 is the general-purpose grade of stainless steel used for fasteners, broadly equivalent to 304 stainless. It gives good corrosion resistance for everyday indoor and outdoor use, which is why it is the most common stainless choice for socket cap screws.

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.

A2 resists rust well in everyday conditions. In harsh salty or coastal settings it can pick up light surface staining over time, so for those jobs A4 stainless is worth the step up. For most indoor and outdoor work, A2 stays clean and strong.

A2 (304 stainless) suits general indoor and outdoor use. A4 (316 stainless) adds resistance to salt and chemicals, which makes it the pick for marine and coastal work. Both share the same DIN 912 spec, just a different grade of stainless and different levels of corrosion resistance.

Mostly no. A2 is austenitic stainless, which is largely non-magnetic. The cold working process in forming and threading the screws can leave a slight magnetic pull, so a weak reaction to a magnet is normal and does not mean the grade is wrong.

Yes. Our A2 socket cap screws are made to DIN 912, the international equivalent of ISO 4762, the same standard used across the socket cap screws range.