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4" Carbon Fiber Digital Caliper

4" Carbon Fiber Digital Caliper

Item # PTW80157
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PTW80157 - Digital Caliper Performance Tool Tools
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Lowest Prices for the best tools from Performance Tool. 4" Carbon Fiber Digital Caliper part number PTW80157 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (8)
  • Q & A (773)
  • Videos (1)
  • Photos
  • Why etrailer?

Performance Tool Tools - PTW80157

  • Measuring Devices
  • Digital Caliper
  • Performance Tool


  • 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 etrailer.com What's up man.

Customer Reviews

4" Carbon Fiber Digital Caliper - PTW80157

Average Customer Rating:  5.0 out of 5 stars   (8 Customer Reviews)

- PTW80157

Delivered early, packaged well, will try out soon 899220

- PTW80157

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. 831574

- PTW80157

Thanks so much for this page especially the links the videos. You all are the best, 804914

- PTW80157

Everything works, all parts needed were there, and the instructional videos were exactly what was needed for a first-timer! 688242

- PTW80157

All three items received in good condition and fast. 681735

- PTW80157

Excellent tool for the money not sure how long it will last, but it does work. 513403

- PTW80157

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 ! 376432

- PTW80157

A very nice useful tool. First one I got had a malfunction and the company sent me another one right away 362459

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


Ask the Experts about this Performance Tool Tools

  • 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.
    view full answer...
  • 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...
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  • How To Measure A Trailer Spindle To Find Replacement Hubs And Bearings
    To make sure you find the right replacement hubs you can do a couple of things. First check out the bearing and see if you can find the numbers for the bearings either etched or stamped on the side of the bearing. If you can not find the numbers you will need to measure the spindle. I have attached a drawing that shows where you need to measure the spindle to find the right replacements. The drawing also shows where to measure for a seal as well. You will also need to measure the inside...
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  • Hub and Parts Replacement for Dexter Axle
    You can use a different bolt pattern as long as the bearing numbers are the same. The easiest way for you to identify the replacement parts you are going to need for the hub is by identifying the inner and outer bearing numbers on your old hubs, which will be stamped directly on the bearings themselves. You would also be able to do this by measuring the spindle to the thousandths of an inch by using a digital caliper such as # PTW80157; you can use the attached photo as a guide for what...
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  • Replacement Bearing Kit for Pop-Up Camper
    The best way to determine the replacement bearings needed on your 2011 StarCraft 1019 pop-up camper is to remove one of the wheels and then the hub and look for the number printed on the inner and outer bearing as well as the seal of that hub. Those 3 numbers will help determine the bearing and seal replacements needed. If you can't determine the numbers printed on the bearings due to bearing failure, you can use the 4" Carbon Fiber Digital Caliper # PTW80157 to measure your trailer...
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  • How To Determine Axle Diameter And Size
    Ideally you can get the measurement of your axle by using a precision instrument like a digital caliper similar to Item # PTW80157. There is also often a sticker or a tag on your trailer axle that tells you the weight capacity of your axle which can also help determine size. Some common axle sizes are: Round, 1-3/4 inch diameter = 2,000-lb axle Round, 2-3/8 inch diameter = 3,500-lb or 4,400-lb axle Round, 3 inch diameter = 5,200-lb to 7,000-lb axle If you are looking to replace...
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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...
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  • Replacement Hubs and Bearings for 1994 Shoreland'r Boat Trailer
    To determine which bearings are used on your 1994 Shoreland'r Boat Trailer, you will need take the hub off and check for the numbers that should be stamped onto the bearings themselves. You can also measure the inner diameter of the bearings or the spindle at the bearing seats if you cannot locate the numbers. I have attached an image that shows where the spindle measurements should be taken. I recommend using a digital caliper like # PTW80157 for exact measurements. For replacement...
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  • How to Measure Hub Bore to Select Correct Bearing Buddy Grease Caps
    Bearing Buddy grease caps are selected based on the hub's bore diameter. Please see the linked photo. This measurement needs to be taken using a precision caliper like # PTW80157 to the nearest thousandth of an inch, e.g. 1.234-inches. (We have about 60 different hubs for 3500-lb axles so this is why you'll need to measure). Once you know your hub bore diameter you can use the linked page to select the Bearing Buddy grease caps to fit them. Note that some hubs have a threaded bore while...
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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...
    view full answer...
  • Bearing Buddy Bearing Protectors for a 2-1/4 Inch Pilot Hole
    The correct tool to use for measuring the pilot hole opening of a trailer hub is a digital caliper like part # PTW80157 to the nearest thousandth. However, based on the 2-1/4" measurement you provided you will want to use the Bearing Buddy Bearing Protectors part # BB2240SS for stainless or part # BB2240 for chrome. The stainless will resist corrosion better than the chrome. I have attached a review video of both options for you.
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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...
    view full answer...
  • How to Determine Which Replacement Hubs Will Fit Spindle
    There are a few different ways to make sure that you are getting the correct hub to match your spindle like the wheel bolt pattern, bearings, and weight capacity. You can either use a Digital Caliper # PTW80157 to measure the different sections of your spindle (see attached picture), or you can simply remove your current hub and locate the bearing, race, and seal numbers (on same attached picture). Once you know what the measurements or numbers are you can either filter through our...
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  • How to Measure Hub Bore to Find Correct Size Bearing Buddy Bearing Protector
    To find the correct Bearing Buddy grease cap for your Rockwood camper trailer you can measure either the hub's bore (please see linked photo), where the grease cap installs, or you can measure the existing grease cap's outer diameter. The hub is a more reliable place to measure since a grease cap can be deformed when it is pulled from the hub. This measurement needs to be very precise - to three one-thousandths of an inch, such as 1.234-inches as an example. We offer a cost-effective...
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  • Locating Replacement Bearings for Yacht Club Utility Trailer
    The easiest and most accurate way to determine which bearings are used on your trailer axle is to take the hub off and check for the numbers that should be stamped into the bearings themselves. If you cannot locate the numbers, you can also measure the trailer spindle at various locations where the bearings sit. I have attached an image that shows where these measurements should be taken. You will want to use a digital caliper like # PTW80157, as the measurements will need to be exact....
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  • Adding Electric Brakes To ShoreLandr Boat Trailer
    I did some research on your ShoreLandr trailer and found it has a weight capacity of just under 3,000-lbs. To add electric brakes to your trailer I recommend part # AKEBRK-35R-SA for the right hand and part # AKEBRK-35L-SA for the left side of the trailer. These assemblies have a 4-bolt brake mounting flange pattern. For a hub and drum I recommend part # AKHD-550-35-K. This hub and drum assembly includes Inner bearing (L68149) and race, outer bearing (L44649) and race, grease seal,...
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  • Replacement Hub Assemblies and Brake Assemblies for Axis Axle # ST5901
    I can help you get the hub assemblies with bearings you need, but I need some information from you on your current bearings. You will need to pull one of your hubs and look at the bearing number on the face of the inner and the outer bearing of your hub. If you cannot find these numbers on the face of each bearing, then you will need to measure the axle spindle with a digital caliper like # PTW80157 in a couple locations to assist. I've attached an article and a photo to help. When...
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  • Which Axle Should Electric Brakes be Installed on with Tandem Axle Trailer
    When installing electric brake assemblies on just one axle of a tandem axle trailer, you will essentially want to choose the axle that is going to be seeing more weight. Typically on utility trailers, most of the weight will be in front of the axles so the brake assemblies will be installed on the front axle. For boat trailers, where the motors are at the rear, you will usually see brakes on the rear axle. I have attached a great article that details everything you will need to install...
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  • How To Determine Replacement Hubs And Brakes For Boat Trailer
    Unfortunately, just the outer bearing is not quite enough to figure out what you need for replacement hubs and bearings. For a trailer with that much weight it sounds like you have a tandem trailer. I recommend replacing the bearings and seals on all of the wheels at the same time, even if you are only replacing the brakes on one axle. If you remove the inner and outer bearing and can find the numbers, that will really help. Or you can use digital calipers like part # PTW80157 and take...
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  • Do Mobile Home Axles Have Weight Capacity Rating
    Mobile home axles are designed for a one time use and do not have a load rating. You may be able to find hubs and drums and other hub components for the specific spindles you have on the axles but that can be very difficult as mobile home axles typically have non-standard sizes. I have attached a drawing that shows where you would need to measure on your spindle for the replacement components. You will want to measure the spindle in the places where the bearing ride and also the inside...
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  • Parts Needed To Replace Hub Assembly And/Or Axle For 1987 Mastercraft Prostar Boat Trailer
    Based on the information you sent, you will need to find the size of your bearings, weight capacity of your trailer and axle, and your bolt pattern. You can determine your bearings size by either finding the stamped part number on them or by measuring them. To measure them, use a digital caliper like Item # PTW80157 to measure the spindle at the bearing seats. Measure both the inner and outer bearing seats on the spindle as well as the spring seat to get the most accurate measurement...
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  • Can You Find Bearing Sizes Needed Based On Vin Number?
    Unfortunately most manufacturers of trailers like your EZ Load do not keep the complete list of parts based on VIN. The best way for us to ensure we get you the correct bearings are to pull your hubs and look at the bearing numbers printed on the face of the bearing. The next best way is to have you measure your spindle where the bearings sit with a digital caliper like # PTW80157 and take some pictures for us. The sizes are very precise, so that is the best way for us to help you get...
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  • Replacement Bearings And Seal For 1998 Triton Trailer WCII
    In order to know what bearing kit you need, I need some bearing numbers from you or some spindle measurements. When you remove one of your hubs, you will find an outer bearing, an inner bearing, and a grease or oil seal. There are numbers printed on the face of each one. If they are legible, let me know those numbers and we can get you the proper replacements. If those numbers are not legible, the spindle diameter will need to be measured in 3 locations. I've attached a photo to...
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  • How to Determine the Replacement Hubs for a 2002 Magic Tilt Trailer
    To determine what the correct replacement hubs are for your Magic Tilt trailer there is a little bit of information that we will need. We will need to find out inner diameter of both the Inner and Outer Bearings as well as the inner diameter of the Grease Seal. To ensure that your current wheels are compatible with the hub that you get you will need to make sure that you also have the appropriate bolt pattern on your hub. If you remove one of your current hubs you should be able to see...
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  • Replacement Rotor With Hub For 2008 Tahoe Boat Trailer Q5SA
    We have many different options, but unfortunately I can't tell by the photo what bearings you need for that spindle. I'll need you to help me with inner and outer bearing numbers (which are printed on the face of the bearings) or I'll need you to measure the spindle with a digital caliper like # PTW80157 at the bearing and seal locations. I've attached a photo to assist. I've also linked the page for rotor with integrated hub for your convenience.
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  • Locating Replacement Bearings and Seal for Crestliner Boat Trailer
    In order to determine the correct replacement bearings and seals for your Crestliner Boat Trailer, you will just need to pull an existing hub and look for the bearing numbers that it uses. This information should be stamped right inside the bearing itself. If you cannot read the number, you can also take a few measurements along the trailer spindle with a digital caliper like # PTW80157. I have attached an image that clarifies where these measurements will be taken. I have included...
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  • How to Identify Needed Replacement Hubs for Adams Manufacturing Drift Boat Trailer
    The best way to find the correct replacement hub is to obtain the reference numbers from the inner and outer wheel bearing. I've provided a photo showing where to find the reference number on the bearing. The inner bearing would most likely be a L44643, a L44649 or a L68149. The outer would most likely be a L44643 or a L44649. If you'd reply with the bearing numbers, I'd be happy to recommend a set of replacement hubs for you.
    view full answer...
  • Converting Grease Hubs To Oil Bath On Skeeter Dual Axle Boat Trailer
    The best way to find the correct bearings and hubs for your Skeeter boat trailer is to remove the hub from one of the wheels and check out the numbers on the bearings you have. I have attached a photo that shows where you can usually find the numbers on the hub components. If you are unable to find the numbers you can use a digital caliper like part # PTW80157, and measure the spindle in the locations noted on the attached photo. Some hubs can be converted to an oil bath but they must...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Video Edited:
Joshua S
Video Edited:
Jacob T
Video by:
Dustin K
Installed by:
Jared G
Installed by:
Matthew S
Written by:
Jacob W
Updated by:
Erin H

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