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CTA Tools 3235 Spark Plug Gapper

4.6 4.6 out of 5 stars 5,746 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
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  • Wide range of professional automotive specialy tools
  • Professional grade
  • Heavy duty design
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Customer ratings by feature

Easy to use
4.5 4.5
Value for money
4.1 4.1
Sturdiness
4.0 4.0
Accuracy
3.9 3.9

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Technical Details

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CTA Tools 3235 Spark Plug Gapper


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From the manufacturer

Accurate and Durable

Compatible with almost all crimpers, the CTA Tools 3235 Ramp-Type Spark Plug Gapper utilizes its die-cast construction for utmost accuracy. With a simple and easy to read scale, you will be able to use this gapper to measure accurate crimping. Built to be resilient and flexible, you will also be able to experience utmost strength and durability as well.

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Product Description

CTA Manufacturing Corp. started in 1978 with a few specialty tools and a lot of great ideas. After spending over 25 years setting up worldwide distribution for the biggest names in the business, the founders of CTA decided to take some of their own ideas to market. Originally named "Classic American Tools", the company expanded from manufacturing about 20 Specialty Tools to well over 1000 tools under the CTA name today. Factories are located worldwide, manufacturing Specialty Tools to meet the demands of today’s technicians. From Timing Tool Kits to Extra-Thin Wall Deep Sockets, CTA offers the widest range of professional automotive specialty tools in the market. Whether tuning up your BMW E46 M3 or removing one-off wheels on a Lamborghini Huracan, CTA supplies you with the right tools needed for the job! Welcome to CTA – we look forward to serving your Specialty Tool needs!

Customer reviews

4.6 out of 5 stars
4.6 out of 5
5,746 global ratings

Customers say

Customers like the readability, value, and quality of the tools. For example, they mention it's simple and easy to use, it'll widen a gap if necessary, and it'd be a good product for the price. Some like the appearance, and performance. Opinions are mixed on accuracy, and size.

AI-generated from the text of customer reviews

122 customers mention87 positive35 negative

Customers like the quality of the tool. They say it's a basic but quality built tool, with good craftsmanship. They also say it is durable, and a solid gauge. Customers also mention that the metal is of good quality and doesn't bend easily. Overall, customers are happy with the quality and durability of the product.

"...I understand now, why he did..An amazing product. Heavier duty than thin feeler gauges and extremely easy to use...." Read more

"This is a solid gauge. Not like those cheap ones that bend in half when you attempt to set the gap. Should last a long time." Read more

"...attention to the angle you hold it at, and be aware that ground electrodes can have a burr because they are shear cut...." Read more

"...Glad I did. Two of the plugs needed setting . Well made. Highly recommend this product." Read more

86 customers mention75 positive11 negative

Customers like the performance of the spark plug gap checker. For example, they mention it works great, functions as designed, and is easy to use. Some say that the metal wasn't so soft, but it worked just fine for six plugs. Overall, most are happy with the performance and usefulness of the product.

"Kinda hard to mess this one up. Works like it should. Easy to read. Added yellow paint to my common measurements." Read more

"Works perfectly" Read more

"Worked exactly as intended. I needed to increase the gap of my chainsaw and this worked like a charm." Read more

"...We corrected the gap installed the Spark plugs and the car is operating perfectly." Read more

68 customers mention66 positive2 negative

Customers find the tool simple, easy to read, and straightforward. They say it's accurate and quick to use. Customers also say the numbers are etched nice and look identical except for the logo. They set the gap without any guesswork or damage to the plug.

"...An amazing product. Heavier duty than thin feeler gauges and extremely easy to use...." Read more

"Kinda hard to mess this one up. Works like it should. Easy to read. Added yellow paint to my common measurements." Read more

"...It is fairly easy and quick to use, but you still have to pay attention to the angle you hold it at, and be aware that ground electrodes can have a..." Read more

"Straightforward and accurate for the moto toolkits, bought two for each to make sure they’re on hand" Read more

59 customers mention59 positive0 negative

Customers appreciate the value of the spark plug gapper. They say it's a great budget tool to gap your plugs. Customers also mention that it'll not break the bank.

"...Easy to use and inexpensive." Read more

"...Cheap enough not to break the bank (or your engine)" Read more

"...It worked great and was definitely worth the money." Read more

"...However for just under 2 dollars it is a great budget tool to gap your plugs...." Read more

35 customers mention35 positive0 negative

Customers are satisfied with the appearance of the tool. For example, they mention it's a nice product, decent little piece, and the best choice. Some say that it looks cheap.

"...It's not dead-on accurate, but good enough for a daily driver, lawn mower, etc...." Read more

"...Looks pretty on my desk setting next to a spark plug gap tool. Attached pic should explain a lot. Poor quality control. pit in edge...." Read more

"easy to use and care. quality as on picture good." Read more

"Great product" Read more

11 customers mention11 positive0 negative

Customers like the versatility of the tool. They say it works as a tool to adjust spark plugs, is good for any spark plug, and is easy to use and read. The built-in adjuster is nice, but can't beat the accuracy of a feeler gauge. The tool is unbreakable and can be kept on a key chain.

"...It would make a nice addition to any key chain. It works ok but scratches easily...." Read more

"Works as a tool to adjust spark plugs but don’t trust the measurement…it was off by a lot" Read more

"...This was one of the right tools and its good for any spark plugs in anything. It has been well worth the cost." Read more

"Great tool for changing spark plug. Make sure you use it properly or else you can damage the tips of your plugs" Read more

114 customers mention40 positive74 negative

Customers are mixed about the accuracy of the tool. Some mention that it gives accurate gap readings without the need for any B.S., and is a perfect tool for checking the gap on spark plugs. However, others say that it's not terribly accurate if you're measuring thousandths of an inch, and the markings are.005" off.

"...It's not dead-on accurate, but good enough for a daily driver, lawn mower, etc...." Read more

"...Quickly check spark plug gap and adjust if needed, without searching through a stack of flat feeler gauges to try and find the right thickness!" Read more

"...But it's not terribly accurate if you're measuring thousandths of an inch...." Read more

"It’s a nice reference when on the go, slightly off comps to feeler gauges but not enough I would worry about using it to gap a plug in the field." Read more

32 customers mention11 positive21 negative

Customers are mixed about the size of the tool. Some mention it's handy size which you can keep on your keychain, while others say that the measurements are completely off.

"I was kind of taken back by the poor fit and finish for something that is supposed to be used on such small parts of the spark plug...." Read more

"...This tool is a handy size; easy to put on a keyring, and easy to read - even for my aging eyes...." Read more

"...pit in edge. Gaps have significant error, .003-.006 wider than markings indicate...." Read more

"Measurements are very inaccurate. I checked gapper with a micron gauge and another gap tool, and this gapper is as much as .075-.10 off...." Read more

Accurate but numbers are offset
5 Stars
Accurate but numbers are offset
Checked this with my digital calipers and found the measurements to be accurate when aligned to the large marker nearest the decimal point for each number. I imagine the reviews mentioning inaccurate measurements were aligning with markers under the center of the numbers and therefore +0.005" too large
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Top reviews from other countries

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Amazon Customer
5.0 out of 5 stars Must have for changing sparkplugs
Reviewed in Canada on November 20, 2023
Customer image
Amazon Customer
5.0 out of 5 stars Must have for changing sparkplugs
Reviewed in Canada on November 20, 2023
Good quality, metal is not soft or flimsy. I checked for spark plug gap tool at Canadian tire and they had soft flimsy metal for similar price. Out of 6 pre-gapped spark plugs from Toyota 4 needed adjustment to .40.
Tool that you wont use frequently but you need it to adjust spark plug gaps.
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JUAN C.
5.0 out of 5 stars Excelente producto.
Reviewed in Mexico on September 26, 2023
よっち!
3.0 out of 5 stars ちょっと
Reviewed in Japan on August 10, 2022
Sergio Sanchez
5.0 out of 5 stars Excelente
Reviewed in Mexico on September 11, 2023
Wendell MacKenzie
5.0 out of 5 stars perfect tool for gapping plugs
Reviewed in Canada on April 24, 2022