Double ended PH3 impact driver bits, 65mm long and sold in a pack of two. Built to handle the torque peaks of high-powered impact tools, with a heat-treated body and black phosphate finish for corrosion resistance.
The 65mm PH3 double ended impact driver bit is one of those things you don’t think about until the one in your driver snaps mid-job. These bits are designed specifically for impact drivers, not just repurposed standard bits with a hopeful attitude. The double ended format means when one end gives up, you flip it round and carry on. Simple.
Impact driving puts a completely different kind of stress on a bit compared to a standard drill driver. The rotational torque comes in rapid peaks rather than a steady load, and that’s what destroys ordinary bits. These have been through a specific heat treatment process that reduces hardness in the body of the bit, which sounds counterintuitive but actually allows the shank to flex slightly under load rather than crack straight through. The tip retains the hardness needed to grip the fastener, while the body absorbs the punishment.
Where These 65mm Impact Bits Fit Into Your Workflow
The 65mm length makes these well suited to situations where a standard 25mm bit won’t reach comfortably, particularly when driving into recessed fixings, through jigs or templates, or anywhere you need a bit more distance between the chuck and the work. PH3 is the size you reach for with larger Phillips head screws, commonly used in structural timber work, decking, and heavier cladding applications. If you’re running a lot of No.10 or No.12 gauge Phillips screws, this is the bit you want loaded.
The black phosphate finish isn’t just cosmetic. It gives a degree of protection against surface corrosion, which matters if you’re working outside or storing bits in a damp van toolbox. They won’t last forever in wet conditions but they’ll fare considerably better than bare steel.
Double Ended Design
Both ends are identical PH3 tips, so there’s no guessing which way round to flip it. When one end rounds off or chips, you switch ends and keep going. For the price, having two usable tips per bit makes reasonable sense on a busy site. The 65mm ph3 double ended impact driver bit format is popular with fixers and joiners who go through bits regularly and want something that performs consistently without paying premium prices for a single-ended equivalent.
These come in a pack of two bits, giving you four usable tips in total. Keep a few packs in the bag and you’re unlikely to get caught short.
Pro Tip: When a PH3 bit starts camming out of the screw head before it looks visibly worn, check the tip under decent light: even slight rounding at the edges of the cross profile will cause that, and flipping to the fresh end will fix it immediately.
These bits are primarily used with impact drivers for driving larger Phillips head screws into timber, decking boards, structural frames, and cladding. The 65mm length is useful wherever a bit extension would otherwise be needed, keeping things tidy and reducing the number of components in the driver. They're well suited to site carpentry, first fix joinery, and outdoor construction where PH3 fixings are standard.
Best For
Driving PH3 Phillips head screws with impact drivers
Structural timber and first fix carpentry
Decking and cladding installation
Recessed or hard-to-reach fixings
High-volume screwdriving on site
Compatible With
1/4 inch hex shank impact drivers
Impact drill drivers
Standard drill drivers (reduced lifespan)
PH3 Phillips head screws
Key Specifications
Drive type: Phillips PH3
Length: 65mm
Double ended design: two tips per bit
Shank: 1/4 inch hex
Finish: black phosphate
Pack contains: 2 bits (4 usable tips)
Not suitable for: Not suitable for use with Pozidriv or cross-head screws that require a PZ drive. PH3 bits will not seat correctly in PZ3 fasteners and will cam out under load, damaging both the bit and the screw head.
Fit the bit into the 1/4 inch hex chuck of your impact driver and ensure it clicks securely into place. Set your driver to an appropriate speed and torque setting for the screw size and material. Keep the driver square to the fastener throughout the drive to avoid camming out, particularly at the start of the drive before the thread has engaged.
When one tip shows signs of wear, remove the bit, flip it, and refit the fresh end. Store bits in a dry location to keep the phosphate finish doing its job. Avoid leaving them loose in a wet toolbox for extended periods.
Check that the screw head is PH3 Phillips before fitting the bit
Insert the bit into the 1/4 inch hex chuck and confirm it is locked in
Position the tip squarely in the screw head before applying trigger pressure
Drive at a controlled speed, increasing torque gradually for harder materials
Keep the driver aligned with the screw axis throughout to avoid tip damage
When the active tip shows wear, remove, flip, and refit the other end
What is the difference between PH3 and PZ3, and which screws do these bits fit?
PH3 is a Phillips drive and PZ3 is a Pozidriv drive. They look similar but are not interchangeable. Phillips has a simple cross profile, while Pozidriv has additional radial lines between the arms. These bits are PH3 and should only be used with Phillips head screws. Using a PH bit in a PZ screw, or vice versa, causes rapid cam-out and damages both the fastener and the bit tip.
Why are these called impact driver bits rather than standard screwdriver bits?
Impact drivers deliver torque in short, sharp rotational pulses rather than a continuous turning force. Standard screwdriver bits are hardened throughout and tend to snap under that repeated shock loading. These bits use a heat treatment process that reduces hardness along the body of the bit, allowing it to flex and absorb the peaks rather than fracturing. The result is a bit that lasts considerably longer in an impact driver compared to a standard bit used in the same tool.
Manufactured using a heat treatment process that creates a differential hardness profile: the tip is hardened for grip and durability in the fastener head, while the body of the bit is left softer to absorb torsional shock loads generated by impact drivers. The black phosphate surface finish provides basic corrosion resistance for site and storage conditions. Shank is 1/4 inch hex, compatible with standard quick-release impact driver chucks.
Drive Type
Phillips PH3
Length
65mm
Shank
1/4 inch hex
Ends
Double ended
Finish
Black phosphate
Pack Quantity
2 bits
Usable Tips
4
Application
Impact drivers
Size
No2 x 25, No2 x 50
Box Quantity
10, 5
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