bing tracking image
  1. Accessories and Parts
  2. Fastenal
  3. Trailer Brake Controller
  4. Hardware
Zinc Plated Hex Flange Nut - M6

Zinc Plated Hex Flange Nut - M6

Item # 185916
Our Price: $1.70
Accessories and Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.08 lbs
In Stock
Fastenal Hardware Accessories and Parts - 185916
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
M6 flange nut is zinc-plated for durable corrosion resistance. 1-800-940-8924 to order Fastenal accessories and parts part number 185916 or order online at Free expert support on all Fastenal products. Great prices and Fastest Shipping for Zinc Plated Hex Flange Nut - M6. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (44)
  • Q & A (0)
  • Photos
  • Why etrailer?

Fastenal Accessories and Parts - 185916

  • Trailer Brake Controller
  • Hardware
  • Fastenal

M6 flange nut is zinc-plated for durable corrosion resistance.


  • Metric hex flange nut
  • Zinc-plated steel construction
  • Coarse threads
  • Class 8 grade


  • Works with 10-mm wrench
  • Diameter: 6 mm
  • Thread pitch: 1 mm

0185916 Zinc Plated Hex Flange Nut - M6

Installation Details 185916 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Zinc Plated Hex Flange Nut - M6 - 185916

Average Customer Rating:  4.9 out of 5 stars   (44 Customer Reviews)

M6 flange nut is zinc-plated for durable corrosion resistance.


I ordered a trailer brakes controller and a couple of metric nuts, they were delivered on time and in good condition, now it’s time to install.


This is such an amazing nut! The threads were spot on, the chrome finish really completed the look of the engine bay. This is a very good nut, I definitely recommend it.


This kit and the accompanying video were a great fit to get a brake controller on my Jeep. Everything worked as planned. The video even told me I would need a little extra wire and a nut, that I went ahead and got even though I didn't actually end up needing it. Thanks etrailer for the excellent products and service.


etrailer made it easy to buy and install a brake controller in my pickup. Everything necessary for installation arrived quickly in one box, was compatible with factory wiring and worked...the first time. Way to go etrailer!


Works great and "as advertised". Only problem was I chose the "free shipping" option as a promotion when I purchased it and it took 10 days to get to me. I found that unacceptable. It shouldn't take that long to ship a product weighing in at 1.5 lbs. and the size of a fist from the midwest to Cali. I needed it in 7 days so had to go out and find the exact same one at a local store (for $50 more), then return the etrailer one to the store for a refund when it finally came. I would have saved money and time by just paying the few bucks to get 3-5 day shipping. Nowhere on the free shipping promotion did it say how long it would take.


I am very happy with the controller and was very easy to install. Once I figured out where to mount it the rest was a breeze. Glad I ordered the 2 hex flange nuts.


I have found the product to be just as advertised. I was very pleased with the support I got from eTrailed in chosing the product. The customer care person was very helpful. The video on your web site were very helpful during the installation.The order was delievered on time and as promised. Overall an excellent experience. I will be glad to recommend etrailer to my friends.



Worked as advertised in the video install of the wiring harness.


I had a hard time finding a flange but that would fit the post of my truck for my break controller. This fit perfectly.


Product great, but that was expected. The service and timeliness of the transaction and shipping was second to none. Very Impressed with


Fit my 07 Chevy avalanche for brake control wire up to fuse box for stud.


Delivery arrived as promosed. Well packaged and all items accounted for, can't wait to get to work on this and be ready for camping season!

Thanks etrailer for the great service!


Product was just as I expected. Order management was easy. Great experience.


Good product and great installation vid eo


Excellent !

Reasonable pricing
for Item, Shipping.

And fast turn around.

5 Star experience.


Another easy transaction and speedy delivery. My Project is complete. Thanks again.


Worked great


Fit my 2010 Silverado great.


Just what I needed. Just as advertised.


Great product still working great.


Best d**n nuts this side of the Mississ ippi.



Just a nut and I didn't even us it haha. I am sure it is fine



No problems..

Show More Reviews

See what our Experts say about this Fastenal Accessories and Parts

  • Could Lock Nut be Used on Underhood Connections of GM Brake Controller Wiring
    Sounds like you have a GM truck that has underhood connections that need to be made for the brake controller circuit to be functional and you are wondering if a lock nut could be used instead of a standard nut and the answer is yes. The Nylock of the lock nut would not interfere with the connection at all.
    view full answer...
  • How to Get 12 Volt Power For Installation of a Prodigy Brake Controller on a 2011 GMC Yukon Denali
    The wiring to power the brake controller on your 2011 GMC Yukon Denali is under the hood on the driver side next to the fender well. Remove the cover for the power distribution box and you will find the wire taped to a harness between the fender well and power distribution box. We have an FAQ article that details this, see link, and I added a photo that I took of the wire locations on a GM pickup. You may also have to connect the 12 volt power wire for your 7-Way trailer connector. Our...
    view full answer...
    Image 1 for Image 2 for
  • Locating the Brake Control and Battery Charge Wires on a 2007 GMC Yukon Denali
    The brake control wire you are looking for on your 2007 GMC Yukon Denali will be located between the fuse box and the driver side fender. It may be wrapped up in black electrical tape. Once you have located the wire you will need additional hardware to secure the wires to the studs. I have included links to the two nuts used to secure the wires to the studs. I have included an article and a video that shows the location of the brake control wire and the battery charge wire on your vehicle....
    view full answer...
    Image 1 for
  • How to Make the Underhood Connections to Install a Brake Controller in a 2011 GMC Sierra
    The wiring connections that are made in the install video you referenced are correct. The wire you find between the fender and the power distribution box goes to the terminal on the left and then the wire you find near the brake master cylinder goes on the right terminal and attaches with a nut like part # 185916. For more info check out the FAQ article that details how to install a brake controller on a truck of your generation. I also attached a link to the video you referenced.
    view full answer...
  • How to Get the 12 Volt Hot Wire to Work on a 2009 Chevy Suburban With 7-Pin Trailer Plug
    To activate the power connection at the trailer connector on your 2009 Chevrolet Suburban, you will need to locate the battery charge wire under the hood. This wire is located under the master cylinder brake booster assembly and is taped up. Once located connect the ring terminal to the smaller power stud at the front of the power distribution box under the hood, with an M6 nut, # 185916. I have linked a photo that shows the location of this wire and the attachment point for you. If you...
    view full answer...
    Image 1 for
  • Is Additional Hardware Needed for Thule Universal Mounting Kit # 7533998
    For Thule Universal Mounting Kit # 7533998 the nuts for the screws are fixed in the clamping parts so there is no additional hardware for them. The ends that attach to the ski rack attach to the rack with nuts that should already be on the rack. They should be M6 nuts to match the screws. We have M6 nut # 185916.
    view full answer...
  • 2014 Silverado Power Distribution Block Stud Size on Power Distribution Block
    The posts on the power distribution block of your 2014 Chevy Silverado 1500 are M6 like the part # 185916 and M8 like part # 185917. The M8 is for the 12 volt power supply and the m6 is for the brake controller power supply.
    view full answer...
  • What Size Nuts Are Needed to Connect Wires Under Hood for Brake Controller Installation on GMC Yukon
    As it seems you already know, when installing a trailer brake controller on your 2007 GMC Yukon you will need to locate the two wires under the hood that need to be connected to fully activate the vehicle's tow package. One is the power wire to the brake control and the other is the battery charge line to the 7-Way connector. You will need to attach both of the wires to the threaded studs under the Gray handle at the front of the fuse box. To do this you will need one M6 x 1.0 nut like...
    view full answer...
  • Which Nuts Needed to Complete Brake Controller Connections At Fuse Box on 2007 GMC Sierra New Body
    There are two threaded studs on the front of the power distribution box (closest to the front bumper) that will need to have the 12-V feed to the trailer connector and the power feed to the brake controller connected if they aren't already. As you've likely found, GM decided to save the $ 0.25 it would have cost them to supply the nuts needed to secure the wires to the studs. Both studs are different sizes, you'll need a M6-1.0 nut which we carry as part # 185916 and an M8-1.25 nut which...
    view full answer...
  • Recommended Replacement M6 Square Head Carriage Bolt With Flange Nut
    Thanks for all the pictures and the measurements! I took a look at what we have, and the closest items I was able to find to what you're needing is: -The Replacement Square T-Bolt for Thule Xadapt12 Watersports Adapter Kit # 853208914, & -The Zinc Plated Hex Flange Nut # 185916. The bolt # 853208914 measures 7/8" long (22.23 mm), has a 3/4" wide head ( 19 mm), and has a shaft diameter of .23" (5.84 mm). Additionally, the flange nut # 185916 will work great with M6 bolts that have...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Are There Connections Under the Hood of a 2008 Chevy Silverado For Brake Controller Install
    To install a brake controller like the part # 90195 in your 2007 Chevy Silverado there are a few connections under the hood of your truck that need to be made. There is one wire by the truck's fender that will need to get connected to the fuse box and there is another wire beneath the brake booster that needs to get run to the fuse box. Check out the help article I attached that details this process. For nuts you will need M8, # 185917 and the M6, # 185916. I also attached an install video.
    view full answer...
  • Power Distribution Stud Nut Sizes for Installing a Brake Controller on a 2007 Chevy Silverado
    GM does not supply the attaching nuts required to secure the wires to the studs. These can be obtained locally. You will need (1) M6 x 1.0 nut, # 185916 and (1) M8 x 1.25 nut, # 185917. I have attached an FAQ for you that may also help.
    view full answer...
  • Parts Needed to Install a Prodigy P3 Brake Controller on a 2010 GMC Yukon
    There are a couple of small items you may need when installing the P3 Brake controller on your 2010 GMC Yukon with factory trailer wiring package. We have an informational article that details the installation and location of wires on your vehicle that you will need, see link. The only parts that you might need are the M6-1.0 nut, # 185916, and M8-1.25 nut, # 185917, to secure the wires to the power studs at the front of the power distribution box if that step was not completed at the...
    view full answer...
  • Trailer Brake Controller Not Working on 2007 Chevrolet Suburban
    On your 2007 Chevrolet Suburban there are two wires under the hood that have to be connected to make the tow package functional, one is the power wire to the brake control and the other is the battery charge line to the 7 way connector. These wires are both Red/Black with eyelets on them. They are coiled up under the hood and will need to be connected to the under hood fuse box. One of the wires is located between the under hood fuse box and the left (driver) side fender. The other is...
    view full answer...
  • What Is The Proper Direct Wire Harness For The Tekonsha Prodigy P3 On My 2013 Chevrolet Suburban?
    For your 2013 Chevrolet Suburban, there is not a direct wire harness for a brake controller. Your Tekonsha Prodigy P3, # 90195 will have to be hard wired. No plug is present under the dash, but the needed wires are already run. You will se a bundle of wires wrapped with a white tag to the left of the brake pedal. You will need to connect the brake controller to that vehicle wiring already present under the dash. You will also want the 6mm nut # 185916 and the 8mm nut # 185917. I've...
    view full answer...
  • Is the Tekonsha Voyager Compatible witha 2009 GMC Yukon XL
    Brake controllers are not vehicle specific, and virtually any of them can be installed on any vehicle. The Tekonsha Voyager, part # 39510, can be used on your 2009 GMC Yukon, just make sure that you have it wired properly. If your Yukon came with a 7-Way from the factory, all you will need is the brake controller as the Yukon is pre-wired for it. You will follow the instructions on the article you were looking at. There should be a bundle of wires taped up behind the brake pedal. There...
    view full answer...
  • How to Wire a Tekonsha Prodigy Brake Controller to a 2008 Chevrolet Silverado 1500 LT
    Yes, there are two wires that would need to be connected to a couple of posts on your power distribution block in your engine bay. This is a fairly easy process, it may take some time to locate those wires. Fortunately, we have a How-To article written up on how to do this that I have linked below. I will run through the process quickly below and add a link to the article to help fill in any blanks and provide some pictures. Follow the instructions for the brake controller to mount it...
    view full answer...
  • Draw-Tite Brake Controller Part # 5504 Not Lighting Up After Wiring To 2010 Chevrolet Tahoe
    It sounds like the connections of your # 5504 that need to be made under the hood of the vehicle have not been made. There are two wires, both Red/Black with eyelets on the end. One wire is located between the fuse box and the driver side fender, the other wire is located under the brake master cylinder. Each wire has a different sized eyelet on the them and will connect to the studs at the front of the fuse box. You will need an M6 nut, part # 185916 and an M8 nut, part # 185917, to attach...
    view full answer...
  • Installation of Draw-Tite Time-Delayed Brake Controller on 2010 Chevy Silverado
    Installation of the Draw-Tite Time-Delayed Brake Controller, part # 5504 could not be simpler. Under the dash, above the emergency brake pedal you will find a bundle of wires with a white tag hanging on it. This is your tow package wiring. The brake controller will wire directly into this bundle of wires. The black wire on the controller will attach to the red and black striped tow package wire. The red controller wire attaches to the light blue and white striped tow package wire, the...
    view full answer...
  • Brake Controller Hot Wire Connection for a 2007 Chevrolet Suburban with Factory Wiring Under Dash
    On your 2007 Chevrolet Suburban, you will need to make a connection under the hood to activate the power wire for brake controller installation. We have an article that details where the factory wiring is and where to hook it up for you to review, see link. The brake controller power wire is located under the hood between the power distribution box and the fender, see photo at right. This wire has a ring terminal on the end of it, and needs to be connected to the smaller of the two 12...
    view full answer...
  • Brake Controller Wiring Instructions for a 2011 Chevrolet Silverado Z82
    The Z82 is a trailer towing package installed by GM the manufacturer of the 2011 Chevrolet, Silverado. If you are installing a brake controller on the 2011 Chevrolet, Silverado, and it does not have a factory integrated brake controller, you will only need a brake controller like the Tekonsha Prodigy, item # 90885, that you mentioned. We have a video, see link, that details this installation and shows where to find the wires that are needed to splice to the wires on the brake controller. If...
    view full answer...
    Image 1 for
  • Finalizing Connections for the Electric Trailer Brake Controller on a 2010 Chevy Tahoe
    It is possible that you will need to make a few connections under the hood of your 2010 Chevy Tahoe in order to power some of the brake controller and 7-Way functions. Under the hood, remove the cover for the power distribution box, located on the drivers side. The ring terminal for brake controller power is located directly to the right of the power distribution box. It is taped to a wiring harness between the driver-side front fender and the power distribution box. Cut the tape to release...
    view full answer...
  • Installation of a Tekonsha P3 Brake Controller # 90195 on a 2011 Chevy Silverado
    You are correct, you will install the wires from the wiring harness from the Tekonsha P3 Brake Controller # 90195 to the four wires that are attached above your 2011 Chevy Silverado brake pedal. I attached an FAQ article on wiring a brake controller to your vehicle for you to check out also. The # 90195 does not require a level installation, it will adjust to non-level installations and work fine. I attached installation instructions for this product for you to check out also. You are...
    view full answer...
  • Nut Size Recommendation for Making Brake Controller Connection Under Hood of 2009 Cadillac Escalade
    You will need a M6 x 1.0 nut like part # 185916 and a M8 x 1.25 nut # 185917.
    view full answer...

< Previous
123. . .4

Do you have a question about this Accessories and Part?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

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 Mike H
Video Edited:
Mike H
Employee Sue W
Video Edited:
Sue W
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.