Are 22 Inch Bolts Better Than 20 Inch?

I remember staring at a pile of bolts, trying to figure out if the extra two inches on the 22s would actually make a difference for the deck I was building. It felt like a coin toss, a gamble on whether I was overspending or setting myself up for a headache. The truth is, when you’re deep in a project, staring down a hardware store aisle that stretches into infinity, the question of ‘are 22 inch bolts better than 20 inch’ isn’t just about length; it’s about whether you’re buying the right tool for the job, or just another piece of metal destined for the junk drawer.

I’ve wasted enough money on ‘just in case’ hardware and products that promised the moon but delivered dust. So, let’s cut through the noise and talk about what actually matters when you’re deciding between bolt lengths, specifically looking at 20-inch versus 22-inch options.

The Real Reason Length Matters (hint: It’s Not Just About Reach)

Look, nobody wakes up in the morning thinking, ‘Gee, I wonder if a 22-inch bolt is superior to a 20-inch one for my burgeoning fastener collection.’ Usually, you’re in a bind. You’ve got two pieces of something – wood, metal, whatever – that need to be joined, and you’re trying to figure out how much bolt shank you need sticking out. The common advice is always to make sure adequate thread engagement, meaning enough of the bolt’s threaded portion is gripping the nut or the tapped material.

For a typical nut and bolt situation, you want to see a few threads peeking out past the nut. If the bolt end is flush or buried inside the nut, that’s a red flag. It means you’re not getting the full clamping force you think you are, and worse, you might strip the threads on the nut or the bolt before achieving proper tension.

So, when we’re comparing ‘are 22 inch bolts better than 20 inch,’ the first thing you need to consider is the combined thickness of the materials you’re joining. Let’s say you’re bolting a 4×4 post to a concrete footing with a specialized anchor plate. The plate might be half an inch thick, and the material you’re attaching it to might be 3.5 inches thick (for a nominal 4×4).

That’s 4 inches of material. Add in the thickness of the nut and potentially a washer or two, and you’re already pushing it with a 20-inch bolt. The 22-inch bolt gives you that extra buffer. It means you’re more likely to have enough bolt sticking out to properly engage the nut, and you’ve got a little wiggle room if your measurements are slightly off or if the anchor plate has a bit more depth than you anticipated.

It’s not about the bolt being inherently ‘better’ because it’s longer; it’s better for that specific application if the shorter bolt simply won’t do the job correctly.

I remember trying to assemble some heavy-duty shelving units once. The instructions specified a certain bolt length. I, being the ‘I can make anything work’ guy, decided to use a slightly shorter bolt I had lying around because I didn’t want to make a special trip to the hardware store. The shelves wobbled like a drunk sailor.

It took me another hour and a trip back to the store to get the correct length bolts. That was a hard lesson: trying to save a few minutes or a few bucks upfront often costs you way more in time and frustration later. The extra two inches on the 22-inch bolt can mean the difference between a secure, stable joint and a shaky, unreliable one. It’s about making sure the threads have enough purchase to create a strong mechanical connection.

When Bigger Isn’t Necessarily Better (and Other Myths Debunked)

Here’s where I get a bit contrarian. Everyone talks about ‘strength’ and ‘durability,’ and sure, a longer bolt can contribute to a stronger connection if it’s needed to achieve proper thread engagement. But simply picking the longest bolt you can find isn’t always the smart move. Sometimes, a bolt that’s too long can actually weaken your connection, believe it or not.

Think about it: if you have a lot of bolt sticking out past your nut, and you’re putting shear forces on it (forces trying to slide the joined materials past each other), that extra length acts like a lever arm. It’s more prone to bending or snapping under stress. So, while we’re asking ‘are 22 inch bolts better than 20 inch,’ the answer is a resounding ‘it depends.’ If your material stack is, say, 18 inches thick, and you use a 22-inch bolt, you’ve got 4 inches of bolt sticking out beyond the nut.

That’s a lot of potential use for something to grab onto and bend. In that scenario, a 20-inch bolt, giving you only 2 inches of extra shank, might actually be more solid against bending forces, assuming it still provides adequate thread engagement.

The common misconception is that more length automatically equals more strength. That’s like saying a longer piece of string is always stronger than a shorter one – it depends on the string and what you’re tying.

The real strength comes from the quality of the connection. This means proper material selection (grade of bolt, type of material being joined), correct torque applied, and importantly, sufficient thread engagement.

If a 20-inch bolt gives you perfect thread engagement (say, 5-6 full threads showing past the nut) and a 22-inch bolt gives you the same, but with less excess shank, the 20-inch might actually be the ‘better’ bolt for that specific shear load. It’s about the engineering of the joint, not just the length of the fastener. (See Also: A 325 A 140 A 490 A 255 Bolt Never Reuse )

What to Look for Beyond Just Inches

When you’re staring down those bolt options, don’t just grab the longest one. Here’s what I consider:

• Material Thickness: Measure the combined thickness of all the parts you need to fasten together. This is your baseline.
• Nut and Washer Thickness: Don’t forget to add these to your material thickness. A standard nut is about half an inch thick, and a washer can add another eighth or so.
• Desired Thread Engagement: Aim for at least 3-5 full threads showing past the nut. More is often better, but not excessively so.
• Shear vs. Tensile Loads: If the joint will experience bending or sideways forces (shear), a shorter bolt with less excess shank might be more durable than a long one that can act as a lever. If it’s purely holding things together with straight pulling force (tensile), then maximum thread engagement is key.
• Access: Sometimes, a longer bolt is easier to handle and start threading, especially in awkward positions.

I’ve seen folks use enormous bolts where a smaller, correctly sized one would have done the job with less material and less weight. It’s like using a sledgehammer to crack a nut. Efficiency is key, and that includes fastener selection.

The Nuts and Bolts of Thread Engagement (literally)

Let’s get down to brass tacks – or rather, metal threads. The whole point of a bolt is to clamp two or more things together. How well it does that hinges almost entirely on how much of its threaded section is actually gripping the threads in the nut or the material it’s screwing into. This is ‘thread engagement.’ It’s probably the most overlooked aspect when people ask ‘are 22 inch bolts better than 20 inch,’ because everyone just thinks ‘longer is stronger.’ Nope.

So, how do you calculate this? It’s not rocket science, but it requires a bit of practical measurement. Take your two pieces of material.

Measure their combined thickness. Let’s call this ‘Material Thickness’ (MT). Then, add the thickness of any washers you plan to use (W).

Finally, add the thickness of the nut you’ll be using (N). The total length of bolt you ideally need is MT + W + N + a bit extra for thread engagement.

Let’s say you want 5 threads showing past the nut. If you’re using a 1/2-inch diameter bolt, each thread is roughly 1/13 of an inch. So, 5 threads would be about 5/13 of an inch (around 0.38 inches).

Let’s round that up to half an inch for simplicity and a good safety margin. So, your target bolt length is roughly MT + W + N + 0.5 inches.

Now, let’s apply this. Suppose you’re joining two pieces of metal, each 9 inches thick. You’re using a 1/2-inch nut (approx.

0.5 inches thick) and a washer (approx. 0.125 inches thick). Your total material thickness is 18 inches.

Add the nut and washer: 18 + 0.5 + 0.125 = 18.625 inches. Add your desired thread engagement of 0.5 inches: 18.625 + 0.5 = 19.125 inches.

In this scenario, a 20-inch bolt would be perfect. It would provide just over half an inch of thread engagement past the nut.

A 22-inch bolt, however, would give you almost 2.5 inches of excess bolt shank sticking out beyond the nut. That’s a lot of extra metal that doesn’t contribute to clamping force and could be a point of failure or snagging. So, in this case, the 20-inch bolt is definitively ‘better’ because it achieves the objective with less excess.

Conversely, if your materials were 10 inches thick each, making your MT 20 inches. Add nut and washer: 20 + 0.5 + 0.125 = 20.625 inches. Add thread engagement: 20.625 + 0.5 = 21.125 inches. Now, a 20-inch bolt would be too short. You’d barely have any threads showing, or worse, none. A 22-inch bolt would be ideal here, giving you just under an inch of thread engagement. This is why asking ‘are 22 inch bolts better than 20 inch’ without context is like asking ‘is a longer screwdriver better?’ It depends on the screw! (See Also: Am Banjo Bolt )

Bolt Length vs. Material Stack: A Quick Guide

*Note: This table assumes a standard 1/2″ nut and washer. Adjustments needed for different fastener sizes.*

Common Pitfalls and How to Avoid Them

I’ve seen people make the same mistakes over and over when choosing bolt lengths, and frankly, it drives me nuts. One of the biggest is ignoring the thread pitch. People often assume all bolts of the same diameter have the same thread count per inch (TPI). Not true.

You have coarse threads (like UNC – Unified National Coarse) and fine threads (like UNF – Unified National Fine). A 1/2-13 bolt has 13 threads per inch, while a 1/2-20 bolt has 20 threads per inch. The finer thread will engage more deeply for a given length of thread on the bolt. So, if you’re using a fine-thread bolt in a situation where a coarse thread would have sufficed, you might not need that extra length.

However, the converse is also true: if you’re using a coarse thread and need maximum grip, you might need a longer bolt to achieve the same level of thread engagement you’d get from a fine thread.

Another classic blunder is not accounting for the deformation of materials. When you tighten a bolt and nut, especially on softer materials like wood or even certain plastics, the surfaces can compress slightly under the clamping force. This effectively ‘shortens’ your material stack. If you picked your bolt length based on the uncompressed measurement, you might find that after tightening, your thread engagement is less than you planned. This is another reason why having a little extra bolt length is often a good thing – it accounts for this minor compression. However, as I’ve said, ‘a little extra’ is key. Too much extra length becomes a liability, not an asset.

Then there’s the whole issue of ‘standard’ lengths. Hardware stores often sell bolts in 1-inch increments (or sometimes 2-inch). This means you might be forced to choose between a 20-inch and a 22-inch bolt even if your perfect theoretical length is, say, 21.25 inches. In this case, you have to decide which is the lesser evil.

If 21.25 inches is your sweet spot, and a 20-inch bolt won’t give you enough thread engagement, you must go up to the 22-inch. It’s better to have a little too much length than not enough.

The excess can often be dealt with by using a longer nut, adding more washers, or sometimes even cutting the bolt down if it’s absolutely necessary and you have the tools and expertise. But usually, you just live with the extra length sticking out.

One last common mistake: assuming all bolts are created equal. A cheap, unbranded bolt might have shallower, less precise threads than a high-quality one. This means you might need more of its length to achieve proper engagement compared to a premium bolt. Always consider the grade of the bolt (e.g., Grade 5, Grade 8) and its overall quality. For important structural applications, you absolutely want to use the best grade and quality you can afford. The question ‘are 22 inch bolts better than 20 inch’ can’t be answered without considering the entire system, including the quality of the hardware itself.

Real-World Applications: When the Extra Inches Count

So, where do you actually see the need for lengths like 20 or 22 inches? These aren’t your everyday hardware store finds for assembling IKEA furniture.

We’re talking about substantial projects. Think about building a very large, solid deck frame. You might be joining large timbers, like 6×6 posts to beams, or attaching ledger boards to a house. In these instances, the sheer thickness of the lumber means you’ll quickly reach lengths that require 20-inch or even 22-inch bolts.

For example, if you’re attaching a 4-inch thick beam to a 6-inch thick post, that’s 10 inches of material. Add a couple of thick washers and a nut, and you’re already approaching 12 inches. If you need to get through another structural member or anchor plate on the other side, you’re easily into the 18-20 inch range. The extra two inches of a 22-inch bolt could be the difference between a secure connection and one that’s borderline.

Another area is heavy-duty trailer construction or modifications. When you’re building or repairing the frame of a substantial trailer, you’re dealing with thick steel channels and structural beams. These often require long, heavy-duty bolts to make sure the frame can withstand the stresses of carrying heavy loads and enduring rough roads. Imagine joining two 6-inch steel C-channels together, plus plates and gussets. You’re looking at a significant stack-up of material. Here, the decision between a 20-inch and a 22-inch bolt isn’t a luxury; it’s a necessity determined by the engineering of the trailer frame. A bolt that’s too short could lead to frame failure, which is obviously a catastrophic and dangerous outcome.

I also see this in large-scale agricultural equipment or industrial machinery. Think about attaching a massive plow to a tractor, or a specialized attachment to a combine harvester. These components are subjected to immense forces. The bolts holding them together need to be long enough to provide substantial thread engagement through thick metal brackets and housings. In these situations, the question ‘are 22 inch bolts better than 20 inch’ is answered by the load specifications and the design of the machinery. It’s not about preference; it’s about meeting rigorous engineering requirements. The extra two inches might be the only way to achieve the necessary clamping force and structural integrity required for such demanding applications. (See Also: Are 7 Bolt Dsms Reliable )

Even in some custom automotive builds, especially for chassis reinforcement or suspension components, you might encounter situations where very long bolts are required to pass through multiple layers of frame rails or custom brackets. The choice between specific lengths often comes down to the exact clearance and the designer’s intention for thread engagement and load distribution. It’s never just about picking the longest one you can find; it’s about finding the one that precisely meets the structural demands.

Practical Tips for Choosing and Using Long Bolts

When you’re dealing with bolts in the 20-inch to 22-inch range, these aren’t your everyday fasteners, and they require a slightly different approach. First off, storage. These long bolts can be awkward. They don’t fit neatly into small bins. I ended up rigging up a simple pipe rack along the back wall of my workshop for my longer bolts. It keeps them organized and prevents them from rolling around and getting damaged. You don’t want the threads on a 22-inch bolt getting dinged up before you even use it, because that can compromise the connection.

When you’re actually using them, handling can be a challenge. They’re heavy and unwieldy. A helper is often a good idea, especially when trying to align holes. I’ve also found that using a bolt starter or a guide rod can be incredibly helpful. This is just a slightly smaller diameter rod that you insert into the hole first, and then you slide the bolt alongside it, guiding it into place. It saves a lot of fumbling and reduces the risk of cross-threading, which is a disaster with these long, expensive bolts.

On the topic of cross-threading, this is where quality really matters. A cheap bolt with slightly off-spec threads is far more likely to cross-thread into a nut or a pre-tapped hole, especially when you have several inches of bolt to maneuver. Always try to start threading the bolt by hand for as many turns as possible. You should feel it go in smoothly. If you feel any resistance, stop immediately, back it out, and try again. Forcing it is the quickest way to ruin both the bolt and the nut, or the threads in the material itself. You can end up with a $30 bolt and a $50 part that are both useless.

Lubrication is another big one, especially with long bolts and heavy-duty applications. A little bit of anti-seize compound or even just some grease on the threads (both on the bolt and inside the nut) can make a huge difference. It reduces friction, allowing you to achieve proper clamping force with less effort, and it makes disassembly much easier down the line. It also helps prevent galling, which is a form of severe surface damage that can occur when two metals rub together under pressure. This is particularly important with stainless steel or aluminum fasteners. For general steel bolts, a good quality lubricant is always a smart addition.

Finally, torque. If the application calls for a specific torque value, don’t guess. Use a torque wrench. Long bolts can be deceiving; it’s easy to over-tighten them because they have so much use. Over-tightening can stretch the bolt beyond its yield point (making it weaker), strip threads, or damage the materials being joined. Under-tightening is equally bad, leading to a weak connection that can loosen over time. For these substantial fasteners, getting the torque right is a must for safety and durability.

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Final Thoughts

So, when you’re standing there, agonizing over whether to grab the 20-inch or the 22-inch bolt, remember it’s not about which number is bigger, but about what your specific application demands. I’ve learned the hard way that the ‘right’ bolt isn’t just about length; it’s about making sure proper thread engagement, considering the stresses the joint will endure, and not overdoing it with excess material.

My go-to is always to measure twice, buy once. Lay out your materials, stack your washers and nut, and see exactly how much bolt you need. If a 20-inch bolt gets you just to the cusp of good thread engagement, and a 22-inch bolt gives you a comfortable margin with only a bit of extra shank, then the 22-inch bolt is your winner. If both give you ample threads but the 22-inch leaves a ridiculous amount of bolt sticking out, then the 20-inch is probably the better, more sensible choice.

Ultimately, the question ‘are 22 inch bolts better than 20 inch’ is a distraction. The real question is: ‘Is this bolt length the correct length for the job?’ Get that right, and you’ll have a connection that holds strong for years. Get it wrong, and you’ll be back at the hardware store, or worse, dealing with a failed joint.

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