Are Johnny Bolts and Closet Bolts the Same Thing? Yes/no

Are johnny bolts and closet bolts the same thing? Not quite — and the difference matters when your toilet is rocking. A closet bolt is the standard bolt that anchors a toilet to the flange on the floor. A johnny bolt is a specialized repair bolt used when that flange is cracked, broken, or missing its bolt slots.

Both live in the same corner of the plumbing world, which is why the terms get mixed up constantly. Hardware stores sometimes shelve them together, and some manufacturers even label repair bolts as "closet bolts" on the package.

Here's the practical version: if you're resetting a toilet on an intact flange, you need ordinary closet bolts. If the flange ring itself is damaged, a johnny bolt can often save you from cutting into the floor. This guide breaks down exactly what each one does, when to use which, how to install both, and the mistakes that turn a 30-minute job into a leak call.

Are Johnny Bolts and Closet Bolts the Same Thing? The Short Answer

No — they are not the same thing, though they overlap. A closet bolt (also called a flange bolt or toilet bolt) is the long bolt, usually 1/4 or 5/16 inch in diameter, that threads through slots in the toilet flange, passes up through the base of the toilet, and gets capped with a nut and decorative dome cap. It's the standard fastener on virtually every toilet installation in North America.

A johnny bolt is a purpose-built repair fastener. Instead of relying on the flange's bolt slots, it grips the inside of the closet flange or the drainpipe itself — often with an expanding or swing-style mechanism — so you can still mount a toilet when the flange ring is broken or the original bolt slots are stripped or corroded away.

Think of it this way: the closet bolt is the bolt, and the johnny bolt is a bolt plus its own anchoring system. That's why johnny bolts cost more, come in fewer standard sizes, and appear almost exclusively in repair kits.

The confusion is understandable. Both perform the same final job — holding the toilet down and compressing the wax ring — and plumbers use the names loosely. But if you buy the wrong one, your project stalls: a johnny bolt won't slot into an intact flange the way a standard bolt does, and a plain closet bolt has nothing to grab when the flange is gone.

What a Closet Bolt Does on a Standard Toilet

A toilet install is a stack of parts working together, and the closet bolt is the clamp that holds the whole stack tight. From the floor up, you have the drainpipe, the closet flange (the PVC or cast-iron ring glued or soldered to the pipe, sitting on or just above the finished floor), a wax ring, the toilet's horn, and finally the bolts and nuts.

When you set the toilet, its horn presses into the wax ring, and the base lands over two closet bolts sticking up from the flange. Tightening the nuts does two things at once: it pulls the toilet down hard enough to compress the wax into a watertight seal, and it locks the toilet to the floor so it can't shift. A shifting toilet breaks that wax seal quickly, which is why a loose bolt almost always shows up first as a sewer smell or a small leak around the base. (See Also: Are Holley 2300 and 2280 Same Bolt Pattern)

Standard closet bolts are typically sold in pairs, 2 1/4 to 3 1/4 inches long, with a rounded or slotted head designed to sit flat in the flange's keyhole-style slots. The top end accepts a nut, often with a plastic or brass dome cap hiding it from view.

• Compression: squeezes the wax ring to roughly half its free thickness
• Anchor: transfers the toilet's weight and lateral loads into the flange and floor
• Alignment: the slots in the flange let you slide the bolts to match the toilet's base openings

What a Johnny Bolt Is and When Plumbers Reach for One

A johnny bolt exists for one scenario: the flange's bolt-holding hardware has failed. Cast-iron flanges rust through. PVC flange rings crack when someone overtightens a nut or drops a heavy object. Older installs sometimes have flanges set below floor level with no solid ring left to accept a standard bolt.

Instead of threading through a slot, a johnny bolt anchors itself. Common designs include a swing-type bolt that rotates behind the flange body, an expanding rubber or metal sleeve that wedges inside the drain opening, and versions that screw into the flange body itself. Once anchored, the bolt presents the same threaded stud a standard closet bolt would, so the toilet mounts normally on top of it.

Plumbers reach for one when replacing the flange means tearing out tile, cutting pipe under a slab, or opening a ceiling below. A johnny bolt kit — often sold with a new wax ring and caps — can turn a two-hour demolition job into a 20-minute fix.

That said, it's a repair, not a rebuild. If the flange is cracked across its full diameter, or the pipe itself is damaged, a johnny bolt is a bandage. Codes in many areas expect a properly secured flange, so a johnny bolt is best treated as a sound temporary-to-medium-term fix, with a full flange replacement as the permanent solution when access allows. Confirm local plumbing code requirements before relying on one long term.

Closet Bolts vs Johnny Bolts: Side-by-Side Comparison

The fastest way to keep the two straight is to compare them on the things that matter at the hardware store and under the toilet. The table below covers the practical differences.

One more distinction worth knowing: some manufacturers print "closet bolt" on johnny bolt packaging because both belong to the closet-flange family. Read the description, not just the label — if the package mentions a swing arm, expansion, or "repair," it's a johnny bolt.

How to Install or Replace Standard Closet Bolts in 8 Steps

Replacing closet bolts usually happens while resetting a toilet for a new wax ring, but you can sometimes swap them without lifting the bowl if the old bolts are simply corroded. Here's the full process, done properly: (See Also: Are M7 Bolts Common)

1. Shut off and drain. Turn the stop valve off, flush to empty the tank, and sponge out remaining water. Disconnect the supply line.
2. Remove the old caps and nuts. A flat screwdriver pops the caps; a 3/8 or 7/16 wrench (or socket) removes the nuts. If a nut is rusted, soak it with penetrating oil and give it five minutes.
3. Rock and lift the toilet. Rock the bowl gently side to side to break the wax seal, then lift straight up and set it on a towel or scrap cardboard.
4. Scrape the old wax. Clean both the flange and the toilet's horn completely. Leftover wax prevents a proper seal.
5. Inspect the flange. Check for cracks and confirm the flange sits on or slightly above the finished floor. This is the moment to discover you need a johnny bolt instead.
6. Set the new bolts. Slide fresh closet bolts into the flange slots, 180 degrees apart, aligned with the toilet's base openings. A dab of silicone under each bolt head keeps them from sliding while you set the bowl.
7. Set the toilet and tighten gradually. Lower the bowl over the bolts, sit on it to compress the wax, and alternate tightening the nuts a quarter turn at a time. Stop when the toilet stops rocking — usually snug, not maximum torque.
8. Trim, cap, and reconnect. Cut excess bolt length with a hacksaw, snap on the caps, reconnect the supply, and test-flush while watching the base for leaks.

How to Install a Johnny Bolt on a Damaged Flange

If inspection revealed a broken flange, the johnny bolt route avoids demolition. The exact steps vary by kit, so read the instructions in the box, but the general sequence looks like this:

1. Remove the toilet and clean the flange. Follow steps 1–5 above. Scrape wax off the ring and out of the drain opening so the anchor can grip.
2. Identify the damage type. One broken slot? A swing-arm johnny bolt on the good side plus a standard bolt may work. Both slots gone or a cracked ring? Use a full johnny bolt kit on both sides.
3. Position the anchor. For swing-style bolts, rotate the arm behind the flange body or under the flange lip. For expanding types, insert the sleeve into the drain opening to the depth the instructions specify — usually just below the flange face.
4. Tighten the anchor mechanism. Expand or screw the anchor until it's firmly seated. It should not rotate or pull out with firm hand pressure.
5. Check bolt spacing. The two studs must match the toilet's base openings, typically 5 1/2 inches apart on a standard 12-inch rough-in toilet. Adjust before the wax goes on.
6. Install the wax ring and set the toilet. Same as a standard install: new wax ring on the flange, lower the bowl over the studs, compress by sitting on it.
7. Tighten, trim, and cap. Alternate quarter turns on each nut until the bowl is stable, cut the excess stud, and cap.

Test with a firm push on the bowl in several directions. Any rocking means the anchor isn't holding — stop and re-seat it before the wax seal gets ruined.

Sizes, Materials, and Head Styles That Actually Matter

Grabbing the wrong bolt off the shelf is the most common reason a simple reset goes sideways. Three specs decide everything.

Diameter: 1/4 inch (often marked 1/4-20 thread) is the most common closet bolt size, but some toilets — particularly certain American Standard and newer models — use thicker 5/16 inch bolts. Take an old bolt with you or measure the hole in the toilet base. A 1/4 inch bolt rattling in a 5/16 inch hole lets the bowl shift no matter how tight you crank it.

Length: 2 1/4 inches suits most standard installs where the flange sits at floor level. Go to 3 1/4 inches if your flange sits below the floor, you're stacking a flange extender, or you're using a thick wax ring. You want at least 1/2 inch of thread showing above the nut after tightening.

Material: brass resists corrosion and is the traditional choice, but it's soft and strips easily. Stainless steel is stronger and handles moist environments well. Avoid plain zinc-plated steel in this application — bathroom moisture and wax-seal leaks will rust it within a few years.

• Brass: best for corrosion resistance; tighten gently
• Stainless steel: best for strength and longevity
• Slotted heads: let you hold the bolt with a screwdriver while tightening the nut — genuinely useful
• Wing-style or T-heads: help keep bolts from spinning in the flange slot

Common Mistakes That Cause Wobbling Toilets and Leaks

Most toilet-base failures trace back to a handful of avoidable errors. Watch for these on your own job:

• Overtightening. Porcelain cracks under point pressure. Tighten until the rocking stops, then stop — a quarter turn past that can spider-crack the base, and the crack almost always appears days later.
• Tightening one side fully first. This tilts the bowl and crushes the wax unevenly. Always alternate sides, a quarter turn at a time.
• Cutting bolts too short before setting the bowl. Measure after tightening. If you cut first and the nut needs another two turns, you've got nothing left to grab.
• Reusing a crushed wax ring. Wax only compresses reliably once. If the toilet has been lifted, use a new ring — they cost a couple of dollars.
• Ignoring a rocking bowl. If the bowl rocks after tightening because the floor is uneven, shim it with plastic toilet shims, then tighten. Tightening harder never fixes an uneven floor; it just cracks porcelain.
• Skipping the flange height check. A flange more than about 1/4 inch below the finished floor needs an extender or a flange repair ring, or the wax ring will eventually fail no matter how good the bolts are.
• Forgetting silicone under bolt heads. In an open flange slot, an unsecured bolt slides out of position while you're wrestling the bowl into place, and you end up lifting the toilet again.

None of these are difficult to avoid — they just require slowing down at the moments that feel like the finish line. (See Also: Are Jegs Head Bolts Good)

Common Questions About Toilet Flange Bolts

Can I Use a Johnny Bolt on an Intact Flange?

You can, but there's no reason to. A standard closet bolt is cheaper, simpler, and easier to align. Johnny bolts earn their price only when the flange's bolt slots or ring are damaged. If your flange is intact, buy a plain pair of brass or stainless closet bolts and skip the repair hardware.

What Size Are Standard Closet Bolts?

Most are 1/4 inch in diameter with a 20 threads-per-inch thread, sold in pairs between 2 1/4 and 3 1/4 inches long. Some toilets require thicker 5/16 inch bolts, so check the hole in the base or take an old bolt to the store. When in doubt, longer beats shorter — you can trim the excess.

Why Does My Toilet Rock Even with New Bolts?

Rocking after fresh bolts usually means the floor is uneven, the flange sits too low, or the shims are missing. Tightening more only risks cracking the porcelain. Level the bowl with plastic shims at the base, trim them flush, and caulk around the outside — leaving the back open so leaks stay visible.

Do I Need to Remove the Toilet to Replace Closet Bolts?

Usually yes. The bolts pass through the base of the bowl, so a full replacement requires lifting the toilet and a new wax ring. If the old bolts are simply loose and the threads are sound, you can sometimes retighten the nuts and swap the caps without lifting the bowl.

How Tight Should Closet Bolts Be?

Snug, not brutal. Tighten alternating sides a quarter turn at a time until the bowl stops moving under firm hand pressure. On brass bolts especially, excessive torque strips threads or cracks the porcelain base. If the bowl still rocks when properly snugged, the problem is shimming or flange height — not torque.

Are Johnny Bolts a Permanent Fix for a Broken Flange?

Treat them as a solid repair rather than a forever fix. A properly installed johnny bolt can hold a toilet securely for years, but the underlying flange damage remains. When you eventually replace flooring or have better access, a full flange replacement is the durable answer, and some local codes expect it.

Verdict

Are johnny bolts and closet bolts the same thing? No — a closet bolt is the standard fastener that anchors a toilet to an intact flange, while a johnny bolt is a repair bolt with its own anchoring mechanism for broken or stripped flanges. They do the same final job but solve different problems.

Use plain brass or stainless closet bolts for new installs and routine resets, and reach for a johnny bolt kit only when the flange ring or bolt slots have failed and replacing the flange means demolition.

Whichever you use, tighten gradually and alternately, keep a spare wax ring on hand, and shim an uneven floor instead of cranking harder. Since plumbing codes and hardware vary by area, confirm any repair approach with your local plumbing authority before relying on it long term.