Long Hex Key Wrench (8x10pcs)

M10 cap screws hold gearbox and bearing housings, motor and pump mounting feet, machine bases and frames, heavy guarding, vehicle and trailer chassis components, agricultural implements and hydraulic manifolds. They live outdoors, under load, and in this climate they corrode into their threads.

So the useful content at 8mm is about what to do when it will not move, because that is the situation this key is most often bought for. The instinct is to find more leverage, and more leverage is the wrong answer. The recess is a hexagonal pocket in the head of the screw, and it has a limit that has nothing to do with how strong the screw is. Once the corners of that pocket give way there is nothing left to grip and no larger size to step up to, which is the difference between a socket head and an ordinary bolt with flats on the outside. A rounded socket head means drilling, an extractor, or welding a nut onto it.

The order that actually works is penetrating oil first and then time, which is the part everyone skips. Heat next, where the surrounding assembly and any nearby seals or wiring will tolerate it. Then shock, a sharp tap on the key end in line with the screw, which breaks the corrosion bond in a way steady pulling never does. Leverage last, and only once the fastener has already begun to give.

Seating matters more here than anywhere. Push the key right to the bottom of the recess before you load it, because at this size the forces are high enough that a partly seated key will start rounding the mouth of the socket on the first serious pull.

It is forged chrome vanadium, hardened and tempered, which is what allows a key of this section to carry the torque an M10 fixing expects without the corners deforming.

Buyers are plant and machinery fitters, agricultural and earthmoving workshops, hydraulic engineers, fabricators, heavy vehicle and trailer shops, and dealers supplying industrial customers.

We also stock hex bit sockets, which is the better route when a fixing of this size needs a breaker bar or a torque wrench rather than a key.

The piece count in the catalogue title is Harden's carton figure. This is one 8mm key. Message us on 94 77 111 8880, tell us the job, and we will get it to you anywhere in the island.