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4" Carbon Fiber Digital Caliper

4" Carbon Fiber Digital Caliper

Item # PTW80157
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  • Reviews (15)
  • Q & A (0)
  • Videos (1)
  • Photos
  • Why etrailer?

Performance Tool Hand Tools - PTW80157

  • Measuring and Layout Tools
  • Digital Calipers
  • 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:  4.8 out of 5 stars   (15 Customer Reviews)


quick delivery


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.



All three items received in good condition and fast.


Delivered early, packaged well, will try out soon





See what our Experts say about this Performance Tool Hand Tools

  • Replacement Hub Assemblies with 12 Inch Drum for Electric Brakes
    The information you provided unfortunately doesn't give me enough info to help you get the correct hubs yet. What I need is either the bearing number printed on the face of the inner and outer bearing or the number on the races also printed on the face of the race, but often more difficult to read. The other option is to use a digital caliper like # PTW80157 and measuring the spindle diameters where the bearings ride as well as where the seal is. These measurements will also help me...
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  • Determining Replacement Bearings Needed for 1972 Airstream
    In order to know what bearings you need for your 1972 Airstream trailer, you will need to pull one of your trailer hubs and look at both the inner and outer bearing. The bearing number should be printed on the face of each bearing as well as the grease seal on the back. If you can get me those numbers, I can help you get the correct replacement bearings. If you are unable to get those bearing numbers, then you will need to use a digital caliper like # PTW80157 to get the inner and...
    view full answer...
  • Bearing Numbers for Hub Replacement on 2005 Fleetwood Destiny Sea Pine
    Unfortunately I can't find the bearing replacement information online, so to ensure you get the correct replacement you will need to pull one of the hubs. The hubs will have two bearings and on the face of each one there is a number. If you can get me the number on those bearings as well as the number on the grease seal on the backside of that hub, I can help you get the correct replacement. If you cannot get the bearing numbers, then you can measure the spindle using a digital caliper...
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  • Measuring Spindle for Replacement Idler Hubs Compatible with Axle
    All of our hubs have a 1.98 inch inner bore, but that doesn't necessarily mean we don't have something compatible with your axles. The inner race and bearings change things so that the hub fits the spindle measurements. To determine if we have a compatible fit, you can use a digital caliper like # PTW80157 to get the spindle measurement at the inner bearing, outer bearing, and grease seal locations. I've attached a photo to further assist.
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  • Weight Capacity of Dexter P-12 SLR SN: D5287869 Axle
    I called Dexter and they told me that your Dexter P-12 SLR SN: D5287869 axle has a 3,000 lb weight capacity. If you need any parts please let me know what they are and I would be happy to offer my recommendation.
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  • Replacement Bearings for a 2004 Bandit Jet Ski Trailer
    I have attached a photo that shows the correct measurements that will need to be taken in order to find the replacement bearings for your 2004 Bandit Jet Ski Trailer. Bearing diameters are measured to the thousandth of an inch using a digital caliper like part # PTW80157. I will need the B, C, and D measurements from you. Once you can provide me with these measurements I would be happy to see if we have options for you. You could also read me the inner and outer bearing numbers but you...
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  • How to Measure for Replacement Grease Seals on Trailer Axle
    We don't have anything that meets your measurements and they just don't seem correct. I recommend using a digital caliper like # PTW80157 to very specifically measure the seal diameter on the spindle location. I've attached a photo to assist. Then you can remove the seal from the hub and measure the inside of the hub at the grease seal location to get the outer diameter needed. The precision is important because this keeps the bearings lubricated and in working order.
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  • How to Pick Out Dust Cap Replacement for Trailer Hub
    There are screw on dust cover caps but they are only seen typically with oil bath hubs. If your dust cap is falling off it might be that your current cap is too small and you need a slightly larger one. What I'd recommend you do is measure the hub bore where your current cap installs with a digital caliper part # PTW80157 and then check out the link I attached that has all of the caps we offer. Use the filters on the page to narrow down the results to find the correct size.
    view full answer...
  • Help Identifying Axle Capacity of Dexter SLR P12 SN: D8026684
    I tried sending your picture and axle tag to Dexter and they weren't able to identify it strangely enough, BUT I can still help you identify it but you'll need to get me more info on your axle. Before I get into that though it looks like the capacity of your axle was cut off in the picture you sent in. On the white sticker the number on the bottom most likely was going to end with what the capacity is. If you can get me the diameter of your axle that would be the easiest way to determine...
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  • Looking For Hub Replacement For Motorcycle Trailer
    The widest dimension is not where the components of the hub will sit on the spindle. In order to get bearings that fit the spindle I would need the measurements B, C and D from the diagram that I have attached for your reference. That is where the seal, inner bearing and outer bearing sit on the spindle. If you can get these measurements with a digital caliper like part # PTW80157 I can help you find the correct hub.
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  • Do Transmission Cooling Lines Need to be Measured to Determine Size
    To determine the correct size of the lines on your transmission cooler you will need to measure the inner diameter to ensure you get the correct fittings. For this I very strongly recommend using Digital Caliper # PTW80157 to ensure the correct reading. This will allow you to get the correct fittings for a transmission cooler if they are needed. I have added a link to a video review of the calipers for you to check out.
    view full answer...
  • Info Needed to Pick Out Replacement Spindle and Bearings for Horse Trailer
    You will need to get me the dimensions of your spindle where the bearings and seal rides with a caliper like the part # PTW80157 that you referenced and I'll be able to get you the correct spindle and bearing replacement. Or if you can get me the numbers stamped on the bearings or their inner diameters that would work too! The review video I attached for the caliper shows how to use it to measure a spindle.
    view full answer...
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  • What is the Proper Way to Measure Bearing Size
    Yes. In order to determine the precise size of the bearings in the hubs you will want to use either a micrometer or digital calipers like the 4" Carbon Fiber Digital Caliper # PTW80157 so that you get the most precise measurement possible.
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  • Hub Assembly With Bearings for 1991 Ranger Trailer
    I can tell you how to figure out the exact hub you need for your 1991 Ranger Trailer although there is no database that specifies each part for a trailer like your Ranger. Even though it is likely to have the 3,500 lb axles you are going to need to verify exactly what is on your trailer as it can vary; to do this you will need to take apart your current hub assembly and look at the bearings themselves; wipe away the grease and you should be able to see the part number stamped directly...
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  • How to Determine Bearings for 2008 Forest River Rockwell Ultra Lite
    I am not able to cross reference that part number for your trailer. There are two ways to get your correct axle bearings; one is to pull the hub and remove the rear seal carefully so you can get the correct seal number and bearings. The seal will have a part number on it as will the face of both the inside and outside bearing. The other option is to use a digital caliper like # PTW80157 to measure the spindle in those 3 locations. I've attached a photo to assist.
    view full answer...
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  • How To Measure To Replace Damaged Trailer Spindle
    We do not carry repair sleeves unfortunately. If the damage is severe you may consider replacing the spindle with a new one. I have attached a link of the spindles that we carry. If you follow the chart at the top of the page it easy to figure out the replacement. You will need a digital caliper like part # PTW80157 to measure the spindle. I have attached that diagram to this answer as well. I highly recommend to consider replacing it because a damaged spindle can eventually lead to bearing...
    view full answer...
  • How To Measure For Bearing Replacement on Older 1998 Four Winns Trailer
    Since trailer manufacturers do not make information like bearing numbers readily available to the public there is not a way to know the bearings based off of the trailer serial number especially with a trailer that is older. There are a few ways to determine which bearings you need. You can remove the hub and bearings from the hub to check the numbers stamped on the side of the bearings. Sometimes they can be harder to read if the bearings are older so you can also measure the inner diameter...
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  • How To Determine Correct Replacement Bearing Kit
    To find the correct size replacement bearings for your spindle on your trailer there are couple different ways to measure. You first would need to remove the hubs from the spindle. You can remove the existing bearings and check for a number stamped on the side of them. If the bearings are too damaged to read or they are missing, you can measure the spindle in the areas pointed out in the accompanying diagram I have attached. You would need to measure the spindle with a digital caliper...
    view full answer...
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  • Parts Needed to Replace Hubs and Brakes on Ranger Boat Trailer
    Unfortunately these numbers don't really mean a whole lot; it sounds like maybe this is a UFP DB42 axle, but there are some other things that we need to know in order to replace your hubs and provide brakes. We would need to know the axle capacity, the bolt pattern on your existing hubs and then, either the numbers stamped on the backs of the bearings in your current hubs; or the measurements of the spindle at certain spots. You'll need to take the measurements with a digital calipers like...
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  • How To Determine Replacement Bearing Kit Needed for 1999 Mastercraft Boat Trailer
    We don't have a master list of trailer bearings, so the best way to determine the correct bearings and seal for your trailer is to remove the old bearings and check for the part numbers on the bearings. Finding the part numbers will help us find the exact replacement bearings. If you are unable to find the numbers on the face of the bearings, you will want to measure the spindle surface with a digital caliper, like # PTW80157, to determine the measurements for the bearings and the seals....
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  • Replacement Wheel Caps or Grease Caps with Removable End Plug
    We have hub caps/wheel caps and dust/oil caps in stock. It sounds like you are seeking one or both of these. I've linked the pages to your options to assist. If you need help determining the correct fit for your trailer, you can use the digital caliper # PTW80157.
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  • Determining Replacement Parts for Trailer Axle and Hub Fit
    To match the spindle to hub or hub to spindle will require learning the measurements of axle spindle and inner diameter of hub bearings. I recommend using a digital caliper like # PTW80157 to measure the spindle in the bearing a grease seal locations and the inner diameter of each bearing and grease seal. I've attached a video as well as a photo to assist.
    view full answer...
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  • Recommendation to Ensure Bearing Fit on 1996 EZ Loader Trailer
    Unfortunately I can't get you a bearing kit based off of VIN number, but there is a way for you to easily determine the proper bearings needed. You simply need to pull one hub off your trailer and look at the face of the inner and outer bearing as well as the seal. There will be a number imprinted on each one. That will help us get you the correct replacement. If you are not able to read the imprinted number, then some measurements can be taken to ensure fit. You will need to use...
    view full answer...
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  • Replacement Hubs for Zieman 2 Jetski Trailer
    To replace the hubs with the correct fit, you will need to pull one of your hubs. Then you can look at the inner and outer bearing which should have a number printed on them and also there is a number printed on the seal on the back of the hub. If you let me know those numbers, I can help you from there. If you can't find the numbers printed on the bearing faces or if they are just not legible, you can measure the spindles with a digital caliper like # PTW80157 in the bearing and seal...
    view full answer...
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