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Power Tools Direct£10.76Visit shop Timco 12100Cb Carriage Bolts & Hex Nuts - Zinc M12 X 100 Box 25
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B&Q£15.25Visit shop B&Q - TimcoCarriage Bolts & Hex NutsZinc (Size M12 X 10025 Pieces)
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The Timco Carriage Bolts & Hex Nuts (M12 x 100mm) are essential heavy-duty fasteners designed for professionals and DIY enthusiasts working on structural timber projects or ironmongery attachments. Featuring a hallmark domed head and a square anti-spin shoulder, these bolts provide a clean, flush finish while preventing rotation during tightening. While these carbon steel bolts are robust, they are finished in zinc, which makes them ideal for indoor or sheltered outdoor use rather than highly corrosive coastal environments.
| Model Part Number | 12100CB |
|---|---|
| Brand | TIMco |
You will need a 19mm wrench, spanner, or socket set to tighten the included M12 hex nuts.
Yes, this specific 100mm variant is fully threaded.
Yes, the zinc plating provides moderate corrosion resistance suitable for most outdoor garden and timber projects, though they are not recommended for salt-air coastal locations.
No, washers are not included in this package. We recommend adding M12 flat or fender washers for better load distribution on timber.
The domed head is designed to be oversized relative to the M12 shank to provide a clean cover for the bolt hole.
Ensure the square shoulder is properly seated by tapping the head of the bolt into the wood with a hammer.
Verify the threads are free of wood debris and ensure you are using a correctly sized 19mm socket or wrench.
Use a metal-rated hacksaw or angle grinder to trim the excess thread, then file the burrs to allow the nut to be removed later.
To install, drill a clearance hole slightly larger than 12mm through your timber pieces. Insert the carriage bolt and tap the domed head gently with a hammer to seat the square shoulder into the wood. Place the washer (if using, sold separately) and the included hex nut on the thread, then tighten with a 19mm wrench or socket.
For ongoing care, periodically check the nuts for tightness, especially in exterior structures where wood may expand or contract with seasonal moisture changes. While zinc-plated, applying a light machine oil or spray-on corrosion inhibitor can extend the life of the bolt if installed in areas prone to dampness.
