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4" Carbon Fiber Digital Caliper

4" Carbon Fiber Digital Caliper

Item # PTW80157
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  • Reviews (13)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

Performance Tool Hand Tools - PTW80157

  • Digital Calipers
  • Measuring and Layout Tools
  • Performance Tool
  • Carbon Fiber


  • Performance Tool 4" Carbon Fiber Digital Caliper collects accurate measurements on just about anything from projects around the home or office, to automotive repairs, carpentry or laboratory applications
  • Measures outside and inside dimensions
  • Accurate to plus/minus 0.01" or 0.2mm
  • Large easy to read LCD display
  • Lightweight and durable
  • Zero setting at any position within measuring range
  • SAE to metric conversion


  • Material: Durable and lightweight carbon fiber
  • LCD display
  • Measures 0" to 4" SAE by 0.01" increments and 0mm to 100mm metric range by 0.1mm increments
  • Includes 1 LR44 battery necessary for operation

W80157 4" Carbon Fiber Digital Caliper

W80157 4" Carbon Fiber Digital Caliper

California residents: click here

Video of 4" Carbon Fiber Digital Caliper

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Performance Tool Carbon Fiber Digital Caliper Review

Today we'll be looking at the Performance Tool four inch carbon fiber digital caliper. Part number PTW80157. This allows you to read from 0 to 4 inches or 0 to 100 millimeters. It moves in 100ths of an inch or 1/10ths of a millimeter. It has a nice LED screen. You hit the on button and it's easy to read.

You can switch between millimeters and inches. Right now it's in inches and now it's in millimeters. Just by the touch of a button. We also have our zero capability so when we move it down our measurement tool, if we want to measure something and see the difference between another measurement, we can hit the zero button and it shows us the difference. This is a negative distance or a positive distance.

Take it back to zero and hit the zero button again so we can start back from zero inches or zero millimeters. This allows us to measure the outside diameter or the inside dimensions with the other side. Now we can show you in action. On our trailer here, we pulled off our seal. Usually it's stamped with the measurements on it, but this one has worn off over time. WE can use our tool to find the inner dimension of our race.

2.18 inches. If we need to figure out the outside diameter, that'll be 3.35 inches. Other measurements that we might need to know. Come to our shaft. We've got the bearings that sit on our shaft so we might need to know the diameter of our shaft.

We can come up, be 1.24 inches and that'll be for our inner or our outside bearing. If we need to figure out our other, the larger bearing, the inside bearing, we do the same thing. 1.74 inches. Now if we need to know the difference between the two, we come up we get the inside bearing, we hit our zero button, that zeros it out, and we can come to our outside bearing and we see there's almost a half inch difference between the two bearing sizes. Same works if you want to figure out the dimensions here for our race because that's where it sits. This is where our race sits. If I want to do difference in that. I'll take our meter, I'll measure the inside diameter of our race, I'll hit the zero button, and then I can come and measure the outside distance of our race and see if there's any difference at all. Which, there's not, but if there was it would show us. There would be a negative difference or if I measure something bigger, it would show us a positive difference. That's it for a look at the Performance Tool 4 inch carbon fiber digital caliper. Part number PTW80157.Speaker 2: You can find this and everything else right here at What's up man.

Customer Reviews

4" Carbon Fiber Digital Caliper - PTW80157

Average Customer Rating:  5.0 out of 5 stars   (13 Customer Reviews)


I have not used it yet but what I want to use it for it will work just fine then I can order the right parts for my trailer weather is not good right now to use it


Works as described


It works great and it's just plain fun. I bought it to measure bearing buddies and spindles. It works for that but it also has been great for measuring the diameter of carbon fiber tubes I'm using to build a sailboat mast and spars.

It gives instant metric to inch conversions - just push the in/mm button and the measurement in the display converts.

I've used it at least a couple of hundred times and it's still on the original battery.

Pro tip: Close it all the way before you turn it on.


I have always wanted a digital caliper now I have one. I have always relied on my older read out types since this is the one etrailer uses I will be able to take the same measurements they do . My local bearing supplier has priced themselves out of the market so I use etrailer !


A very nice useful tool. First one I got had a malfunction and the company sent me another one right away

Great tool. Use it all of the time
Larry J - 04/04/2018


Everything works, all parts needed were there, and the instructional videos were exactly what was needed for a first-timer!


Thanks so much for this page especially the links the videos.
You all are the best,


Excellent tool for the money not sure how long it will last, but it does work.


Delivered early, packaged well, will try out soon


All three items received in good condition and fast.





Ask the Experts about this Performance Tool Hand Tools

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    In order to make sure you get the correct replacement wheel stud for your Bulldog trailer, you will need to do some measuring to the nearest hundredth of an inch which a digital caliper like part # PTW80157. The measurements you will need to take can be seen in the attached photo. Once you can provide me with the A, B, C, D, E, and F measurements I would be able to make sure you get the correct replacement. If not I have attached a list of our available selection for you.
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  • Locating Correct Replacement Bearings for 1996 EZ Loader Boat Trailer
    The VINs for the EZ Loader Boat Trailers usually start either with 1ZE or 1L8. I was unable to obtain any information from EZ Loader based on the number you provided in your question. The most accurate method for determining the replacement bearings you need for the trailer is to simply pull the hubs and check for the bearing numbers. These numbers should be stamped right inside the bearings themselves. If you are unable to read the numbers, you can also take a few measurements along...
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  • How to Pick Out Grease Cap for Trailer Hub
    We have several grease caps that could potentially work for the hub on the axle you have on your enclosed trailer, see link to the right. To pick out the correct size one you will need to know the pilot hole diameter on your hub. To do this, remove the wheel and tire and remove the grease cap from the center of the hub. Usually it is a metal cap that is just lightly hammered into place. Use a screwdriver to pry off the cap. Clean the grease off and measure the opening with a dial caliper...
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  • How To Determine What Replacement Hubs And Bearings Are Needed For Camper
    In order to replace the bearings or the hubs there are a few things we would need to know. First, you can check the bearing numbers on your camper and we can tell what you would need as a replacement. If you cannot read the numbers on your bearings you can use a digital caliper like part # PTW80157 to measure the spindle where the bearings ride and also measure the inside dimension of the hub you have and we can find a replacement for you. I have attached a drawing that shows where...
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  • How to Select Replacement Grease Seals for Boat Trailers
    Thank you for the grease seal part numbers you provided. I was not able to find a seal cross reference for these so to select replacements your best bet is to measure your spindle diameters and hub bores to get the required inner and outer seal diameters. Use a precision digital caliper like # PTW80157. Then use the linked page and simply click on the filters for your inner and outer seal diameters to see the options in that size. You can also click on your preference for single- or double-lip...
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  • How To Determine What Is Needed To Put Electric Brakes On Trailer
    I have attached a link to a helpful article that explains what is needed to add electric brakes to a trailer. You will need a digital caliper like part # PTW80157 to measure the spindle when it comes time for the bearings and seals that will work with the spindles on the trailer. Once you have determined what size brakes you need you can use the attached link to find the brakes and drums that best fit your trailer.
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  • How To Determine What Bearings Are Needed For Boat Trailer
    The 2.328 measurement of your Bearing Buddies is not really enough to go by when you want the bearings and other hub components. The best way to make sure you get the right components is to pull the hub and get the bearings numbers from the side of the bearings as shown in the attached photo. If you cannot find the numbers on the bearings, I recommend using a digital caliper like part # PTW80157 and measure the axle spindle where the bearings ride and then measure the inside dimension...
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  • How to Determine Which Electric Brake Assemblies Will Fit Tow Dolly 80T-14
    To determine the correct brakes to fit your tow dolly you'll need to pull the hubs off and find the inner and outer bearing numbers as well as the part number of your grease seal. I've attached a diagram showing you how you can find these numbers. If the numbers aren't available you can also measure the diameter of your spindles with a digital caliper, # PTW80157. I've linked an article that may help you with the parts you'll need to add electric brakes to the dolly, as well as our selection...
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  • How to Measure to Determine Correct Grease Seal
    For a grease seal to fit properly it needs to have an inner diameter that matches the spindle diameter and an outer diameter that matches the hub's bore, which is where the seal installs. Please refer to the linked diagram that shows where a seal rides on the spindle, point B. Measurements for things like bearings and seals have to be very exact, and generally require a digital caliper like # PTW80157 that can give you very precise readings, ideally to the nearest thousandth. Once you...
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  • Determining Replacement Components For Horse Trailer With Tandem Square Axles
    There should be a label, sticker or metal tag on the axles or the trailer that describes the weight capacity of the axle and trailer you have. Square axle capacities are hard to determine. Unlike round axles, they do not have specific capacity based on their dimension. To find the right replacement drums and brakes you can measure the inside diameter and depth of your drums as shown in the attached photo. You will also need to know what the wheel bolt pattern is on the drum so you can...
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  • How to Find the Correct Wheel Bearings and Bearing Races for a Trailer Axle
    The best way to find the correct wheel bearings, races, and seals for your utility trailer will be to pull a wheel and hub of the trailer and find the numbers on your wheel bearing. With the bearing numbers, you will be able to check the attached link and match the correct bearings to your axle. If your bearings do not have numbesr or the numbers have worn off, then you will need to measure the inside diameter of the bearings and the seal. The attached picture shows what measurements...
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  • Is a Small Difference in Wheel Pilot Hole and Hub on Hub Centric Axle Okay
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    If you can give me a little more information about your trailer such as the VIN or model number I may be able to do some more checking to see what hub components you have on your trailer. We may have the replacement hub parts you need for your trailer but there is an easier way to determine what parts you need. If you remove the wheel and hub on your trailer and then pull your old bearings off you can check for the number on the parts. I have attached a drawing that shows where the part...
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  • Measuring Axle Diameter to Determine the Capacity
    When measuring an axle to determine the weight capacity you'll want to measure along the actual axle tube. Anywhere between the spring seats will work fine. I also recommend measuring with a digital caliper like # PTW80157 to get an accurate measurement. A digital caliper is a good tool to have when measuring for replacement bearings and other parts as well. Once you have the axle's diameter the typical capacity based on measurements are: - 1,000-lb - 2,000-lb Axles: 1-1/2 inch - 1-3/4...
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  • Replacing Hubs on Old Boat Trailer and Cannot Read Bearing Numbers
    When you cannot locate the bearing numbers for your existing hubs, you will just need to measure your spindle at various locations at the bearing seats. I have attached an image that shows exactly where you should take the measurements. I recommend using a digital caliper like # PTW80157, as the measurements will need to be as exact as possible. Each specified location on the spindle will correspond with a seal or bearing inner diameter. You will also want to determine the bolt pattern...
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