How to Reach and Remove Stripped Hex Screws: The MAC AFRIC Long Arm Ball-end Key Set

What is a ball-end Allen key used for?

A ball-end Allen key lets you turn a fastener while the key sits at an angle, instead of needing it dead square in the socket. That is the whole point of the rounded tip on the long end of each key. A standard hex key has to sit perfectly in line with the screw, and the moment you tilt off that line, the corners slip. The ball end keeps engaging the socket on a slant, which is the difference between reaching a bolt tucked behind a bracket and giving up on it.

If you work in a wheel arch, inside an engine bay, or behind a fitted appliance, that bit of articulation saves real time. You drop the key in from whatever angle the space allows, and you still get the fastener moving. It also speeds up repetitive work, because you can spin a long row of bolts without having to reseat the key perfectly square each time.

How do you loosen or remove a stripped or rounded hex screw?

Turn the key over and use the spiral extractor end. The short end of each key carries a twisted, spiral drive profile that bites into a worn socket and wedges in as you turn, gripping where a standard hex key would only skate and spin. When a hex socket has rounded off, a normal key has nothing square to push against, so it slips. The spiral flutes dig into what is left of the socket and give you a real chance to back the screw out, instead of reaching for a drill and an extractor kit.

If you spend any time on machinery that has been apart before, or on second-hand kit where someone got there first with the wrong tool, this end quietly earns its keep. The steps below get the most out of it.

Why use extra-long (long-arm) hex keys?

Extra-long hex keys give you two things a short key cannot: reach and leverage. The reach comes from the length of the shaft, which drops down into deep, counterbored holes and past the components that crowd a short key out. The leverage comes from that same length, because a longer arm turns more force for the same effort at your hand, which is what you want on a bolt that has been torqued down hard or has corroded in place.

There is a trade-off worth knowing. Longer keys flex more, so for very high-torque work you keep your grip close to the bend to reduce the flex. But for the everyday business of breaking fasteners loose and getting into awkward spots, the long profile is the right call, and it is the reason this set reaches jobs a pocket-sized set never will.

What is S2 steel, and is it good for hex keys?

S2 is a shock-resisting tool steel known for its toughness and wear resistance, which is exactly what a hex key needs, so yes, it is a good choice. The hardest-working surface on the whole tool is also the smallest: the corners that grip the fastener. In this set the steel is heat-treated to a hardness of HRC 56 to 60 on the Rockwell scale, and that figure matters more than it looks.

Too soft, and the corners round off the first time you really lean on them. Too hard, and the key turns brittle and snaps under load. The 56 to 60 range sits in the working sweet spot: hard enough to keep its edges and shrug off wear over years of use, tough enough to take the torque without shattering. In plain terms, it carries on fitting the screws long after a cheaper key would have started to slip.

The keys are finished with a sandblasted matte surface rather than a bright chrome plating, and that is a practical choice rather than a cosmetic one. The matte finish helps resist corrosion in a damp workshop or a humid toolbox, and it cuts glare, so you are not fighting reflections off the tool when you are lining up a fitting under a work light.

Key Features at a Glance

Technical Specifications

What sizes come in the set, and how do you store them?

The set covers nine metric sizes, running from 1.5 mm up to 10 mm (1.5, 2, 2.5, 3, 4, 5, 6, 8 and 10), which takes care of the large majority of hex fasteners you meet on bicycles, furniture, machinery, and vehicles. They arrive in a compact moulded holder that grips each key by size and labels them clearly, so you can see at a glance which one you need and drop it straight back where it belongs.

It sounds like a small thing, but a holder that keeps the set together and in order is often the difference between a five-second job and ten minutes hunting through a drawer. The holder also has a hanging tab, so it sits on a wall board or a hook just as happily as it does in a toolbox.

Who should buy this hex key set?

This is a general-purpose set with a clear bias towards the harder jobs. If your work is always light and always square-on, a shorter standard set may be all you ever need. But if you regularly run into recessed, angled, or worn fasteners, the long arm and the two-way design pay for themselves quickly. Here is where it fits best:

Frequently Asked Questions

Where to Buy Hex Keys in South Africa

Adendorff Machinery Mart operates 29 branches across South Africa, from Cape Town to Polokwane and Durban to Kimberley, with nationwide delivery available from the Aeroton, Johannesburg distribution centre. Whether you are a mechanic in Gauteng, a fitter in the Western Cape, or running a workshop in KwaZulu-Natal, there is a branch within reach or a delivery to your door.