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Trailer Spindle Nut 1"

Trailer Spindle Nut 1"

Item # 165686
Our Price: $10.12
Accessories and Parts
Shipping Weight: 0.14 lbs
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TruRyde Trailer Spindles - 165686
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Castle nut for 1" spindles. Bare metal finish. 1-800-940-8924 to order TruRyde accessories and parts part number 165686 or order online at Free expert support on all TruRyde products. Great prices and Fastest Shipping for Trailer Spindle Nut 1". Accessories and Parts reviews from real customers.
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TruRyde Accessories and Parts - 165686

  • Trailer Spindles
  • Spindle Nut
  • TruRyde
  • 1 Inch I.D.

Castle nut for 1" spindles. Bare metal finish.


  • Castle nut for 1" spindles
  • Bare metal finish


  • Size: 1" diameter x 0.532" tall
  • 14 Threads per inch

FA-SN100 TruRyde Trailer Spindle Nut - Raw

Video of Trailer Spindle Nut 1"

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

Video Transcript for Review of TruRyde 1 Inch Diameter Trailer Spindle Castle Nut - 165686

Hi, everybody. Andy here with And today we're just gonna take a very quick look at this trailer spindle nut. This bare metal finish castle nut is for one-inch spindles. So it has to have one inch in diameter, and the overall height, just to be very specific, is gonna be 0.532 inches tall, and this is 14 threads per inch. And that's gonna conclude our brief look today.

I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me..

Customer Satisfaction Score:

Customer Reviews

Trailer Spindle Nut 1" - 165686

Average Customer Rating:  4.8 out of 5 stars   (354 Customer Reviews)

Castle nut for 1" spindles. Bare metal finish.


great website, easy to order from, quick shipping! Customer Service is quick to respond to questions



Did not fit axle spindle so I'll be returning the 2 nuts. Had to get correct size locally so I could finish assembly.


After being in storage, in a field, for more than 2 years, Water had contaminated the original hub, pitting the bearings and races and they had not been serviced since, at least 1999. I polished up the EZ lube spindles, flushed out the old grease and I was ready. Everything fit perfectly. It was aa perfect match. Used new Nuts and Washers. re-installed the Wheels and Tires, Torqued to 90-10lb. The old 6 x 4 Wells Cargo trailer is once again Ready for the coming rendezvous season.


The products appear to be ok. I would give the products 4 out of 5 stars. The 2 star rating is because of the poor shipping.

I ordered 2 leaf springs, 2 spindle nuts and 3 spindle washers. The first box showed up quickly (3 days) but it only contained 1 leaf spring. I called etrailer and they shipped a second leaf spring. After 5 days the package was at my local UPS distribution center but the tracking info said the package had been damaged and ups was contacting the shipper. I found out from ups that the spring had come out of the box, and they did not know who to deliver the spring to. I called etrailer again to discuss the damaged package but etrailer would not ship another spring until the damaged box/loose spring mystery was solved. Another week passed. I finally got the second leaf spring today, but it took about 3 weeks from the initial order date.


exact replacement, they shipped it fast,always great prices and in stock,

I just Rebuilt my trailer using etrialer for all the parts, brake lights bearings winch,they even had all the parts to rebuilt the hyd actuator


Very quick shipping and great communica tion!


quick service good prices


Great products and fantastic customer service,they really go out of their way to try to help you get the correct parts,delivery is fast.


has performed as expected would buy aga in

Tom C.


part is working as expected would buy again


great process and people, fast knowledgeable and efficient


Very easy to place order! Website is user friendly!


The part is what I ordered. But what is almost as important is the inside sales person who helped me with my order. MarthaO was so much better than average and an example for every other inside sales person to emulate. Thank you Martha!


Brake Drum/Hub unit and associated parts arrived quickly and in great shape! Waiting for warmer weather to install. Have used e-trailer parts before to rebuild all brakes, hubs and bearings on camping trailer last summer but over-torqued one bearing set and had an outer bearing failure - almost lost the wheel! This unit will replace that damaged hub which was gouged by riding on the washer and spindle nut causing grease cap not to seal and leak grease. These parts are first class and fit and install perfectly!

John M.


Replaced old hub, bearings and castle nut. Everything working well - no problems and fit was perfect! Ill use etrailer everytime!


Nice upgrade of the axle on my [online] trailer. I had no confidence towing my home made teardrop camper until I installed this axle. The package was damaged in shipping and eTrailer quickly replaced the missing parts.


Ordered spindle nuts and washers at etrailer after trying all the local parts stores. Was exactly what I needed. If I had checked e trailers online site first, I could have found all the bearings and nuts needed. It would have saved me a lot of time and money. I know where to look next time I need trailer parts. They have a great selection of parts and the prices are good.


Thank you for the quick service and good price on my parts. Everything fit perfectly and went together great. I know where to go for all my future trailer needs. Doug


Fantastic replacement perfect thread alignment highly recommend this item.


Everything that was ordered arrived quickly. Quality stuff!


Great service, parts have been put to use, thanks


As usual comes through - needed new trailer bearing hubs and they offered an extensive list with all required specification listed. Then shipped them the next day...Good job!


First off I purchased 1" castle nuts, tang type spindle washers and 2 wheel hubs for a 3500 lb tandem trailer. I wish I had pictures during the assembly but I don't, however these parts all assembled perfectly. The hubs were pre-greased, so all I did was use brake cleaner on the wheel spindles to clean up, the hubs slid on with no problem, the tang washers fit perfectly and the castle nut threaded on with ease, the hub included new lug nuts which made the whole repair a breeze! Very pleased with the purchase and ease of assembly, I was going to piece out the bearings and races but for the price of a complete hub it made more sense to buy it already greased and assembled. E trailers videos and instructions are great to consider before attempting to install the parts.


Fit perfectly


6 wks. ago I started on a refurbishing project off a 1988 Holsclaw boat trailer. I stripped all the paint off, ground and sanded the rust, primed and painted everything, replaced ALL the fasteners with stainless stell and some galvanized. I ordered several things from . Everything I ordered was to exact specifications and the shipping was on-time, everytime. I ordered several bearing items to repack the hubs, this coupler and nifty lifting handle, transom tie down brackets, spare tire carrier and 3 new 570x80 tires mounted on galvanized rims and the company installed stems, free of charge! I love the way this project came out and I've thoroughly enjoyed shopping @! Thank you!


Fit my trailer axel perfect, ordered 2 just in case



Show More Reviews

See what our Experts say about this TruRyde Accessories and Parts

  • What are the Inner and Outer Diameters of the TruRyde Trailer Spindle Nut
    I pulled the TruRyde Spindle Nut, # 165686, and took some measurements for you. This nut has an inner diameter of .93 inches and and outer diameter of 1.45 inches. This spindle nut is designed to fit all spindles that accept a 1 inch nut. I have attached a photo of the measurements I took for you and a photo of where to measure on your spindle to see if this nut will fit.
    view full answer...
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  • Spindle Nut Recommendation for 84 Spindle
    For your 84 spindle the correct nut would be # 165686 which is a 1 inch spindle nut.
    view full answer...
  • What Size Socket Works with 1 Inch Spindle Castle Nut # 165686?
    The TruRyde Spindle Nut # 165686 has an outer measurement of 1.45 inches. You will use a 1-1/2 inch socket on this castle nut or we usually use a channel lock for these installations. I've attached a video of an installation of a hub to assist. You don't want to torque these down tight as you do want to have slight movement and the cotter pin will keep it in place.
    view full answer...
    Image 1 for
  • Thread Count for Trailer Spindle Nut # 165686
    The Trailer Spindle Nut # 165686 that you referenced does have a thread count of 14 threads per inch.
    view full answer...
  • Torque Rating for Spindle Castle Nut
    When installing the castle nut on the end of the spindle, there is no specific torque rating. The nut is ran down until there is no side to side play in the hub, and then backed off to the next notch in the castle nut so the tang washer or cotter pin can secure the nut. Over-tightening the castle nut can damage the bearings, races and spindle. If you click on the video link I provided, and fast forward to the 4:45 minute mark, you can see the procedure.
    view full answer...
  • Thickness of Castle Nut 165686
    The thickness of the castle nut part # 165686 that you referenced is 1/2 inch.
    view full answer...
    Image 1 for
  • Why Does One Brake Assembly Drag more than the Other After Brake Install
    If you installed self-adjusting brake assemblies then you would be fine as the brake tension will adjust itself. If you installed manual adjusting brake assemblies you would need properly adjust the brakes to get the correct amount of drag on all hubs. To see how to set the proper drag on trailer brakes check out the video I attached. Fast forward to the 4:30 mark. Remove the adjusting hole cover from the adjusting slot on the bottom of the brake backing plate. With a screwdriver or standard...
    view full answer...
  • How Tight Does the Castle Nut on a Trailer Spindle Need To Be
    According to our installers you will tighten the trailer spindle nut until it stops by itself. In other words do not torque it down as hard as you can. It just has to be tight. A little play is to be expected. You do not want to torque it down too tight, because that makes the bearings too tight and then that generates heat and your bearings come apart. You might want to try tightening it a few times to get a feel for where it seems like the spindle nut naturally stops. Once it is fairly...
    view full answer...
  • How to Determine the Correct Hub Cap Cover for a 5 Lug Wheel
    I have not heard of a 5 on 4.3" hub cover, so I believe that there might be some incorrect measuring. Using the guide attached, I recommend re-measuring your wheel bolts. I believe you have 5 on 4-1/2" as that is the most common, however if you measure: -2 5/8", then you have a 5 on 4-1/2 bolt pattern, -2 3/4", then you have a 5 on 4-3/4 bolt pattern, -3", then you have a 5 on 5 bolt pattern, Or - If you measured 3 1/4", then you have a 5 on 5-1/2 bolt pattern.
    view full answer...
    Image 1 for
  • Are There Shims for a Trailer Axle Castle Nut
    I do have some advice for you but we don't carry any spindle shims for the castle nut. I've messed with many spindles and castle nuts, there are a lot of times it seems there is one notch that's too loose and one that's too tight. I recommend the slightly tighter setting if needed, you don't want any side to side play in the hub when tight. This can cause grooves to wear into the spindle over time and destroy the axle.
    view full answer...
  • Availability of a Replacement Castle Nut for Trailer Spindle
    We have a few options that could work for you, but you will need to measure the threads of your spindle to determine which would work. For a 1 inch spindle nut you would need the part # 165686, for a 7/8 inch nut you would need part # 165931. These are the two most popular sizes.
    view full answer...
  • Availability of a Replacement Castle Nut for a Harbor Freight Trailer
    25 mm is very close to 1 inch, so there is a good chance the castle nut part # 165686 would fit as it is 1 inch. That said we've had customers tell us it's actually 22 mm which we don't carry.
    view full answer...
  • Replacement Seals and Castle Nut for 2000-lb Dexter Axle with EZ-Lube Spindles and 5-Lug Hubs
    The best way to identify replacement grease seals (and bearings and races) is by the original part reference number. The linked photo shows the typical location and appearance of these part numbers. It can be a bit of work to get the parts clean enough to read the part numbers, but this is the preferred method. The alternative is to take precise measurements (of the seal itself or the spindle) using a digital caliper. You can then use the seal's part number or its inner and outer dimensions...
    view full answer...
    Image 1 for
  • Spindle Nut Recommendation for Trailer with 6k Axle
    For a 6k trailer axle you'd need a 1 inch diameter spindle nut like the part # 165686 and you'd be set.
    view full answer...
  • Availability of Castle Nut for Utility Trailer Hubs
    I believe you are referring to a castle nut like the TruRyde 1" # 165686, which is what secures the hub to a trailer spindle. As long as the spindles on your trailer use a 1" diameter castle nut, this will work perfectly as a replacement.
    view full answer...
  • Picking Out 1 inch Trailer Spindle Nut
    Sound like you are looking for a standard 1 inch spindle nut like the part # 165686 which uses a 1-1/2 inch wrench size to tighten/loosen.
    view full answer...
  • Spindle Nut to Use with Spindle TRU27FR
    The correct spindle nut to use with the spindle part # TRU27FR is the part # 165686.
    view full answer...
  • Size of Spindle/Castle Nut for an 84 Spindle
    For an 84 spindle the correct castle nut would be item # 165686 which is a 1 inch spindle nut. It has 14 threads per inch.
    view full answer...
  • What Tool is Needed to Remove the Castle Nut on a Trailer Axle
    The spindle nut on a trailer axle should not be difficult to remove, it only requires a very small amount of torque. It should for the most part just turn off by hand after the retainer is removed whether it's a clip or pin. We don't have a specialty tool for this unfortunately, I usually just use a large set of channel lock pliers and I do this mainly to avoid getting grease all over my hands. That's the way I have always done them since most people don't have the larger sockets these...
    view full answer...
  • What Is The Tread Size For The # 42 Spindle?
    The #42 E-Z Lube Spindle w/ Flange # TRU37FR has a 1"-14 thread size. A replacement Trailer Spindle Nut # 165686 is available if the treads are damaged on the castle nut.
    view full answer...
  • Spindle Nut Kit Recommendation for a Dexter 6k Axle
    Since the D60 Dexter Axle uses a cotter pin and castle nut the # RG05-100 would not be the correct kit for you. For that I would recommend the Trailer Spindle Nut # 165686. For a compatible cotter pin I would recommend the Cotter Pin part # 165649. People use channel locks typically for installation and removal of these castle nuts since they don't really get torqued down and the length of the spindle prevents most standard sockets from being easily used.
    view full answer...
  • Replacement Axle Nut for 3500 lb Boat Trailer Axles
    We have what you need! For EZ-Lube axles which are very common on boat trailers you want to use the Spindle Nut Kit for EZ Lube Axles part # RG05-100. This will have two nuts, washers and keepers. For the non EZ-Lube axles use the Trailer Spindle Nut 1" part # 165686 and the Cotter Pin part # 165649. these are individual so you will want two of each to have all you need. You can confirm these will fit on your axles by measuring your spindle and ensuring that your it has 1" threads on it.
    view full answer...
  • How To Secure A Hub Assembly To A Spindle On A 3,500 Lb. Axle
    The majority of most axles use either a retaining nut or cotter pin with a "D" washer and castle nut to secure the hub onto the spindle. I am not sure what you are referring to as most common axle types do not use a lock washer to secure the hub assembly to the spindle, however I have included all the parts you will need to do so. For the retaining nut you will need the Replacement Nut Retainer part # 6-190. If you need the "D" washer and castle nut you will want the "D" Washer part #...
    view full answer...
  • Pre-Greased Wheel Hub Assembly That Works With L68149, L44649 Inner/Outer Bearings
    Sure thing, I believe what you're looking for is the: -Trailer Idler Hub Assembly for 3,500-lb Axles - 5 on 4-1/2 # AKIHUB-545-35-K. This is a pre-greased trailer hub assembly that uses the same L68149 inner bearing, L44649 outer bearing that you have currently, and are designed to work with 3,5K axles with wheels that are sized 13" to 15".
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Andy C
Installed by:
Andy C

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