TORX – Impact Driver Bits – TX40 x 50 (5 pcs)

These TX40 x 50mm long Torx impact driver bits are built around one straightforward idea: impact drivers hit hard, and ordinary bits don’t last. The 50mm length makes them genuinely useful for recessed fixings, deep-set screws, and anywhere a standard 25mm bit just doesn’t reach. If you’re using a TX40 regularly on site, these long TX40 impact driver bits are worth keeping in the pouch rather than hunting through the van every five minutes.

The metallurgy here is worth a mention. The hardness across the bit isn’t uniform, which sounds like a small detail until your last bit snaps halfway through a fixing run. The body is deliberately left slightly softer than the tip, so it can flex and absorb the torque peaks that modern high-powered impact drivers produce rather than transmitting all of that stress straight to the tip and shattering. It’s the same principle behind crumple zones, only considerably less dramatic and considerably more useful on a roof or a deck job.

What Makes These Long TX40 Impact Bits Different

The heat treatment process is what separates a decent impact bit from a cheap one. These have been through a newly developed heat treatment designed specifically for impact applications, giving the steel a combination of toughness and wear resistance that standard driver bits simply aren’t built to provide. Snap a normal bit in an impact driver at 2,800 rpm and you’ll understand the difference quickly enough.

The black phosphate finish isn’t just cosmetic. It provides a meaningful layer of corrosion resistance, which matters when bits are rattling around a site bag, getting rained on, or left in a drill holster overnight. It also reduces surface friction slightly, which helps with seating in the fastener head and reduces cam-out risk under load.

Torque Absorption in Practice

Torque peaks are the enemy of bit longevity. Every time an impact mechanism fires, it delivers a sharp rotational pulse rather than steady drive force. A bit that can’t absorb that pulse will fatigue and fail faster than it should. The design of these bits distributes that stress through the body rather than concentrating it at the tip or the shank, which is where most failures originate.

Sold in packs of 5, they’re sensibly priced for trade quantities and worth stocking in TX40 if you use that drive size with any regularity. Keeping a few loose in the belt bag alongside a TX25 is a habit worth forming.