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 (5)
  • Q & A (685)
  • Videos (1)
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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   (5 Customer Reviews)

- 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

Do you have a question about this Tool?

  • Recommended Kit to Add Disc Brakes to Trailer With 3,500 lb Axles
  • There is a kit available that will give you everything you need, but it is important that you make sure you have a 4-bolt brake mounting flange, your bolt pattern is 5 on 4-1/2 and your spindle is compatible with inner bearing # L68149 (1.378" inner diameter), outer bearing # L44649 (1.063" inner diameter) and grease seal # RG06-050 (1.719" inner diameter). If you are unsure you need to use a digital caliper such as # PTW80157 and measure your spindle where the bearings and seal ride, as...
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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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  • How to Determine the Correct Replacement Hubs for a Boat Trailer
  • To determine which hubs would be best for your boat trailer there are a few things you will need to look at; the axle capacity on your boat trailer, the inner bearing number, outer bearing number, grease seal number, the bolt pattern of your wheels, and whether or not your trailer has brakes. If you do not know what your axle capacity is you can find it located on the axle itself. It is usually located towards the middle and will typically be stamped into the axle. The bearing and...
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  • Adding Electric Brakes to Northern Tool UltraTow 5x8 Aluminum Frame Trailer
  • Because the trailer doesn't have a traditional size, in order to upgrade to trailer brakes you will need to have a welder install the Brake Mounting Flange for 1-3/4" Round Trailer Axles - 2K # 4-34 which will require the proper jig to ensure placement and alignment. Then you will need to measure your spindles to help get the correct replacement hubs to add the integrated drum. I've attached a photo of the locations to measure with a digital caliper like # PTW80157 to assist in getting...
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  • Replacement Hub and Drum Assemblies for AL/KO 8460 Hubs and Drums
  • It looks like Trailer Hub and Drum Assembly - 5,200-lb Axles - 6 on 5-1/2 Item # 8-201-5UC3 could be the right replacement for you. You can check the bearing numbers if you still have the bearings. If they are 25580 for the inner and LM67048 then this hub and drum assembly will work. If you have different bearing numbers let me know what they are. And if you do not have the bearings anymore you can measure the spindle with digital calipers such as # PTW80157. I have linked a help article...
    view full answer...

  • Replacement Brake Assemblies and Hubs for 1960 Airstream Trailer
  • It sounds like your assemblies are not the typical assemblies and will need to be replaced. For your brake assemblies, I recommend the Electric Trailer Brake Kit - Self-Adjusting # AKEBRK-7-SA along with mounting hardware # BRKH12. If you don't have the brake flange compatible, you can use the Brake Mounting Flange for 3" Round Axle # 4-44-1 which needs to be precisely welded in place. Then for your drum brake assemblies to match, I need some more information. I will need either...
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  • Hub for E-Z Lube Spindle on Boat Trailer
  • In order to determine if hub assembly 8-258-50UC1-EZ will work for you, first know that this assembly is for EZ Lube spindles that require a grease seal with a 1-1/2" inner diameter such as # RG06-020. You are also going to want to remove the hub and take a look at the bearing numbers to make sure your inner and outer bearings are # L44649. Normally that would be enough, but since you sanded the spindle, I also recommend you use a digital caliper such as # PTW80157 and measure the spindle...
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  • How to Find Replacement Trailer Hub Assembly for Dual Axle Trailer with 6 on 5-1/2 Bolt Pattern
  • To ensure you get the correct replacement hubs for your trailer, you will need to find either the bearing numbers on your existing hub assembly or you can measure the spindle if these cannot be found. The bearing numbers should be stamped onto the bearings themselves. I have attached an image that shows what numbers or dimensions are needed. When measuring the spindle, I recommend using a digital caliper like # PTW80157 to get the most accurate measurement possible. For example, the...
    view full answer...

  • How to Determine Correct Bearing Buddy for Trailer
  • It is really easy to determine which Bearing Buddies are the correct fit for your trailer, though we have no way to confirm a fit on any specific make or model, though I do appreciate the detailed info. For you to confirm the right Bearing Buddies all you need to do is measure the hub bores on your trailer's hubs using Digital Caliper # PTW80157 and match the hub bore diameter to the correct Bearing Buddies. Or if you let me know the outer bearing I can match its race, which will have the...
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  • How to Determine What Bearing Buddies Fit on Trailer
  • It is really easy to determine which Bearing Buddies are the correct fit for your trailer, though we have no way to confirm a fit on any specific make or model. For you to confirm the right Bearing Buddies all you need to do is measure the hub bores on your trailer's hubs using Digital Caliper # PTW80157 and match the hub bore diameter to the correct Bearing Buddies. For example, the Bearing Buddy Bearing Protectors - Model 2047 # BB2047 you referenced will fit a hub bore diameter of...
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  • Replacement for Bearing LM48548 and Grease Seal 10-4
  • Grease Seal # RG06-050 has an inner diameter of 1.719" and outer diameter of 2.565", you mentioned you have grease seal 10-4 and it has a width of .5" but from my research it looks like a 10-4 seal has an inner diameter of 1.249" and outer diameter of 1.983". I strongly recommend using a digital caliper such as # PTW80157 to measure the seal, as well as your spindle where the seal rides in order to get the correct replacement. If it does have an inner diameter of 1.249" and outer diameter...
    view full answer...

  • Replacement Hubs For Trailer With 3/4 Inch Outer Diameter Spindle That Is Straight
  • The only hub we have that is currently available for a 3/4 inch spindle is Item # AH15450ECOMP. This is an agricultural hub that fits 3,000 lbs axles for 4 on 5 inch bolt pattern. It takes an inner bearing, Item # LM67048, and outer bearing, Item # LM11949. It is meant to be used for low speed (less than 20 mph) agricultural applications. It is designed for a spindle like Item # AS1500E. If you can find the actual bearing number on your old bearings and seal or can send me a bearing...
    view full answer...

  • 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...
    view full answer...

  • Replacement Bearings, Races and Seal for 1993 Coleman Destiny Pop Up Camper
  • I was able to locate the correct bearings, races and seal that correspond to the part numbers you provided in your question. For bearings you will need the part # L44649 and for races you will want # L44610. Then for the grease seal you will use part # 13194. You can also take a few quick measurements on the trailer spindle at various locations to verify that these are the correct replacement parts. I have attached an image that shows where these measurements should be taken. You...
    view full answer...

  • Bearing Buddy Compatibility with Harbor Freight Trailer 62648
  • Harbor Freight trailers are notorious for not using standard trailer part sizes, but there are times we find a fit. If you measure your hub on the inside of the grease cap with a digital caliper like # PTW80157, I will gladly help you find the correct Bearing Buddy if we have one compatible. You will need to remove the grease cap and either measure the inside of the hub or you can measure the outside edge of the grease cap behind the ridge where it inserts into the hub. The diameter...
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  • How to Pick Out Bearing for 10,000 lb Dexter Axle
  • We have the bearing part # 387A which is over 2 inches in inner diameter and is seen on 10,000 lb axles but I'd have to know exactly what your spindle dimensions are to know for sure what you'd need. If you can use a digital caliper like the # PTW80157 to get me the exact dimension of the spindle where the bearings and seal ride I'll be able to let you know which parts you need. A very common bearing combo for Dexter 10k axles is # 387A and # 25580. Races needed are # 382A and # 25520....
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  • Recommended Brake Assemblies for Karavan Boat Trailer with 3500 lb Axle
  • For your brake assemblies, I recommend the Demco Hydraulic Brake Kit - Free Backing - Galvanized - 10" - Left/Right Hand Assemblies - 3.5K # 40716-15. These galvanized assemblies will work very well for saltwater or freshwater use, resisting corrosion. The free backing design allows you to back up without using the lockout on your coupler. This will absolutely fit your 3500 lb axle. For your Bearing Buddies, bearings, and seals, you very likely have the standard size 84 spindle...
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  • Using Bearing Numbers or Spindle Measurements to Select the Right Replacement Trailer Hub
  • To select the correct replacement hub I would either need to know the inner and outer bearing numbers stamped into the sides of the bearings or the measurements of the spindle. I have included a picture showing where a spindle should be measured. The measurements need to be as accurate as possible so I recommend using digital calipers such as # PTW80157. It looks like hub # AKIHUB-545-35-G-EZ-K will work but you would need a different seal, # 168255TB. We have a will call for local...
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  • Recommendation For Replacement Hubs For Dexter E-Z Lube Torsion Axle
  • Thank you for the information but I need more details to help you because Dexter has several torsion axle options. To determine the right trailer hubs, you will need to know your axle capacity. The easiest way to find this out is to look for a plate/sticker somewhere on the axle that provides information like part numbers, lengths, axle capacity. If you can not find a label then find the size of your axle tube: Round with 1-3/4 inch diameter=2,000-lb axles, Round with 2-3/8 inch...
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  • Replacement Dust Cap or Grease Cap for Trailer
  • We do have replacement dust caps. You will simply need to use a digital caliper like # PTW80157 to determine the size needed. I've linked the page to all your options to assist. I've also linked the page to the bearing protectors that have the integrated grease zerk to maintain them.
    view full answer...

  • Replacement Parts for 1970s Camper Frame with Dayton Fayette Axles
  • The Lippert Components Heavy-Duty Replacement Shock - Yellow # LC283280 is 8.625 inches compressed and 13.5 inches fully extended. Your current suspension may extend and retract slightly further but the shocks will be a good replacement based on the actual shock absorbing as long as they will fit your brackets. Unfortunately we don't have any info on your axle or hubs, so to help, I will need to get the bearing numbers printed on the face of your inner and outer bearing of one hub....
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  • Bearing Buddy for 2-3/8" Grease Cap
  • A measurement of 2-3/8" is equal to 2.375" and there are a number of bearing buddies that are close to that measurement. In order to determine the exact replacement you need, you'll have to use a digital caliper such as # PTW80157 and measure your hub bore for the exact measurement. Your other option would be to take a look at your outer bearing, as that will also tell you what you'd need. Bearing Buddy # BB2240 fits a 2.240" hub bore and works with 1700 series outer bearings. Bearing...
    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.
    view full answer...

  • 15 Inch Wheels Compatible with Baby Moon Caps for 1949 Dual Axle Travel Trailer
  • For 15 inch wheels we have the conventional wheels like # AM20514 that work with the baby moon caps # AM981306 or # AM90086. The conventional wheels we carry are only available in the 5 on 4-1/2 bolt pattern or the 6 on 5-1/2 inch bolt pattern. If you are interested in trading out your trailer hubs, we can get you hubs that will fit with these wheels. I'll just need to know what your bearings are for your current hubs. This is printed on the face of your bearings and I need both...
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  • Recommended Bearing Buddy Kit for Carry-On 5X8G Trailer
  • Based on my research, your Carry-On 5X8G Trailer uses hubs that have a 1.98 inch diameter pilot hole. With this in mind, the correct Bearing Buddy Kit will be one that fits 1.98 inch hub bores like the part # BB1980A-SS. These will replace the grease cap in the axle hub and prevent wheel-bearing failure by keeping water and dirt out. They will also provide easily accessible grease fittings and makes adding grease to the bearings quick and simple. I have included a short installation video...
    view full answer...

  • Replacement Vent Cover for 2003 Keystone Sprinter
  • For your vent covers, there are four different hinge types that you might have. In order to know which replacement cover you need, the hinge style is very important. The sizes are all compatible, but the hinges are not. I've attached a photo to assist. For your seals, I need to know the dimensions. If you are looking for grease seals for your hubs, I need a number printed on it or need you to measure it with digital calipers like # PTW80157.
    view full answer...

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Info for this part was:

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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