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Frequently asked questions
Which coach bolts do I need for building a deck?
Do you want to build a deck and are you using wooden posts as foundation? Then you will need to secure the beams with coach bolts. For every post, you use one coach bolt. With 6 x 6 cm posts and 4.5 x 7 cm, use M8 x 120 mm coach bolts. For bigger posts, for example 7 x 7 cm, use M8 x 140 cm coach bolts.
What are coach bolts?
Coach bolts are threaded bolts with a semicircular, smooth head. Coach bolts are also called carriage bolts. A coach bolt should always be used with a nut. Coach bolts are usually used for strong and heavy structures. Wovar supplies a nut and washer with every coach bolt.
How do coach bolts work?
Drilling a pilot hole is always required when working with coach bolts. We recommend using a drill bit 1 mm thicker than the bolt. Often, you use coach bolts that are 1 cm longer than the material you want to secure. Underneath the semicircular head is a square part. By hitting the head with a rubber mallet, the square neck bites into the wood. Now, the bolt will not turn when you tighten the nut. The washer provides an increased bearing surface and clamp force.
How do I remove coach bolts?
To remove a coach bolt, remove the nut from the bolt. Next, push out the coach bolt. This will be even easier when you used a washer. Because the head of the coach bolt is completely smooth, you will not be able to remove the bolt from this end.
What is the difference between coach bolts and coach screws?
Coach bolts, also known as carriage bolts, feature a machine thread. The head is round, you cannot use a spanner on the head, with a square part underneath it. A coach bolt is always used with a nut.
Coach screws, also known as lag screws, feature a coarse wood thread. The head is hexagonal, meaning you can fasten them on this side with a spanner. Coach bolts have pointed ends, and are not used with nuts, as they are self-tapping.
More and more constructioncompanies, gardeners and timber merchants are choosing Wovar because of
- Extra discounts for large consumers;
- Direct contact with a trained specialist;
- Detailed order history;
Wovar Coach Bolts
Wovar offers coach bolts in galvanized steel, stainless steel, and black. Always including nut and washer. Coach bolts are also called carriage bolts. All coach bolts have a square part underneath the round head. This square neck clamps into the wood, preventing the bolt from twisting when tightening the nut. Coach bolts are frequently used for strong wood-on-wood connections. The most sold sizes are M8, M10, and M12 carriage bolts.
Galvanized coach bolts are incredibly strong and available in lengths up to 300 mm. Stainless steel coach bolts are slightly softer, but will not oxidise. Opt for stainless steel bolts for hardwood types with tannic acids, such as oak and garapa. We also offer black galvanized steel carriage bolts. The high-quality black coating protects the bolt against rust and gives the bolt a beautiful shine.
How do I install coach bolts?
The rounded head of the coach bolts create a sleek finish. Under this head is a square neck. When the coach bolt is inserted in the hole, hit it with a hammer. Use a rubber mallet to avoid damaging the bolt. The hit causes the square neck to clamp in the wood. This means the carriage bolt will not twist when you are tightening the nut. The size of the spanner is 13 mm for an M8 bolt, and 17 mm for an M10 bolt.
Wovar’s coach bolts have a 4.6 quality. This means the carriage bolts have a tensile strength of 40 kg mm2.
Galvanized coach bolts
Wovar’s galvanized bolts are incredibly strong. They are stronger than A2 stainless steel carriage bolts, but may oxidise when the zinc layer is damaged. If you install coach bolts correctly, this layer will not be damaged and the bolt will not oxidise. For heavy wooden structures, we recommend using these galvanized coach. The shank of the bolt is threaded. The length of the threaded part differs per bolt size. The bolt includes a nut and washer.
Wovar sells coach bolts per piece and in sets of 10. Does your project require larger quantities of coach bolts? For bulk consumers, we offer a volume discount. Construction and carpentry businesses can sign up for a free business account to enjoy even more benefits, such as a business discount.
Stainless steel coach bolts
Our stainless steel coach bolts are completely threaded. The bolt includes a nut and washer. A2 stainless steel carriage bolts are not as strong as galvanized bolts. However, the steel is perfect for use in humid environments and can withstand regular chemical deterioration. In addition, stainless steel does not rust, resulting in extremely durable bolts.
Black coach bolts
Wovar’s black coach bolts are incredibly popular. The carriage bolts look great combined with our black gate hinges and other black hardware. But most importantly, they are made of strong, galvanized steel and rust-resistant. This is due to the high-quality deltacoll coating. The black coach bolts have been treated with an intense salt spray test.
The correct drill bit
For an M8 coach bolt, drill a hole with a 9 mm thick drill bit. Similarly, an M10 coach bolt requires a hole that has been drilled with an 11 mm thick drill bit. The hole being 1 mm bigger in diameter than the carriage bolt allows the bolt to slide through smoothly without giving the bolt too much wiggle room. It is important to use drill bits with a high concentricity value. Check out our wood, hardwood, and metal drill bits.
Coach bolts with nut and washer
A big advantage of Wovar’s coach bolts is that they come with a nut and washer. A coach bolt without the corresponding nut and washer is pointless, which is why decided to include these with the bolts for free. Our black carriage bolts even have a black nut and washer. Should you prefer a specific washer or nut, for instance a shakeproof washer or lock nut, then you will have to add these to your order separately.
Is this not quite what you are looking for? Browse our entire collection of bolts, including anchor bolts, threaded rods, and nuts and washers.
Don't need a bolt after all? Explore our wide range of fasteners, including screws, sealants, chains, plasterboard fixings, carabiners, cable ties, staples, and much more.