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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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In Use/Installed


  • Measuring Devices
  • Digital Caliper
  • Performance Tool
Lowest Prices for the best tools from Performance Tool. 4" Carbon Fiber Digital Caliper part number PTW80157 can be ordered online at or call 800-298-8924 for expert service.

  • All Info
  • Reviews (3)
  • Q & A (634)
  • Videos (1)
  • Photos
  • Why etrailer?

Performance Tool Tools - PTW80157


  • 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   (3 Customer Reviews)

- 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?

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  • 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...
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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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  • 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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  • 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...
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  • What is the Difference Between Trailer Hubs # AKIHUB-440-2-G-1K and # AKIHUB-440-2-G-2K
  • The two hubs you mentioned, # AKIHUB-440-2-G-1K and # AKIHUB-440-2-G-2K fit different spindles. More specifically they use different bearings and seals. First, hub # AKIHUB-440-2-G-1K uses L44643, with a 1 inch inner diameter, as the inner and outer bearing, and the seal is a 34823, which has an inner diameter of 1.249 inches and outer diameter of 1.983 inches. Based on your information this sounds like the correct replacement. Check your old bearing numbers or you can take measurements...
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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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  • Replacement Grease Seal for AF3531G
  • I did a bit of searching online and called a few grease seal manufacturers but was not able to reference "AF3531G" to any particular product. Therefore, the only way you are going to be able to find the correct replacement would involve measuring the inner and outer diameter using a digital caliper like part # PTW80157. If the inner diameter measures 2.25" and the outer diameter measures 3.376" then part # XLPROLUBE2440SEAL would be correct for you. If you have different measurements...
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  • 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...
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  • Adding Electric Drum Brakes to Carry-On Trailer
  • Based on my research, it looks like your Carry-On 6X8GW2KPT Trailer has a 3,500 pound axle. If this is correct, you will need hub-and-drum and brake assemblies that are compatible with this axle. To upgrade your idler hubs to hub-and-drum assemblies, you will also need to find assemblies that are compatible with the trailer spindle. The numbers stamped into your trailer's existing bearings and seals will help you determine this. If you cannot find the numbers, you can also measure the...
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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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  • Installing Electric Brakes on 2011 Little Guy Silver Shadow Trailer
  • Installing electric brakes on your Little Guy Silver Shadow trailer is a great idea and will certainly prevent a lot of those heart-fluttering moments you referenced from happening. First, if the axle on your trailer does not have brake mounting flanges, they will need to be welded on before electric brakes can be added. The Trailer Hub and Drum Assembly # AKHD-545-2-2K is designed for 2,000 pound axles like what you have on your trailer. It uses the standard # L44649...
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  • What Parts Are Needed to Add Electric Brakes to a Trailer with a 2,000 Lb Axle
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  • Recommendation For New Boat Trailer Hub W/Bearings LM67048
  • To determine the best size hub assembly for your needs, I need the inner and outer bearings size of the old assembly. Based on our fit guide, the bearings size you sent, Item # LM67048, appears to be the outer bearings which gives me a great starting point. If Item # LM67048 is the outer bearings size then we have a few options depending on the inner bearings size. If the old assembly has inner bearings, Item # L68149, you would use Trailer Hub and Drum Assembly Item # 8-407-5UC3-EZ....
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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 Measure Hub to Select Bearing Buddy Grease Cap
  • I reviewed your photo and other photos of your H-F 90154 folding trailer and it appears to have grease caps far larger than 0.984-inches. It sounds like you were quoted a bearing dimension, not a grease cap dimension. What I suggest you do is remove one of the standard grease caps and measure the inside bore of the hub. You will need a caliper like # PTW80157 to measure to the nearest thousandth of an inch, e.g. 1.234-inches. You can then use the linked page to check for a Bearing Buddy...
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  • 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.
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Info for this part was:

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

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