Best Steel Locknuts in 2026
Daisy
Last Updated: Feb 9, 2026
Daisy
Last Updated: Feb 9, 2026
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| STEADFAST INDUSTRIAL | 5.05 | ❌ | ❌ | ❌ |
For use with an externally threaded item that measure 3/8 inch and has 16 threads per inch.
Width Measured From Flat to Flat 9/16"
Height 29/64"
Hex Socket Drive 9/16"
Fastenere brand Nylon Lock Nuts made of stainless steel grade 18-8 which offers a high level of chemical and corrosion resistance and strength that will out perform and out last all zinc plated fasteners for years with out the need to perform costly and time consuming maintenance.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| WindFly | 9.78 | ✅ | ✅ | ✅ |
- Package: 30 x M6 Nylock nuts; - Color: Black;
- Thread size: M6mm; - Pitch: 1.0mm;
- Material: Q215 Carbon Steel ; - Weight: 60g;
- Used for: matching screws & matching bolts.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Eastlo | 9.93 | ✅ | ✅ | ✅ |
Package: 25 PCS 1/4"-20 Nylon Insert Hex Stainless Locknuts
Thread Size: 1/4"-20; Thread Pitch: 20 TPI UNC Coarse Thread; Thread Coverage: Full Thread
Hex Drive Size: 7/16"; Width From Flat to Flat: 7/16 inch; Overall Height: 21/64"
Made of 304 Stainless Steel (no coating outside) which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments.
Will NOT COME LOOSE: With a nylon insert inside, the lock nuts greatly reduce loosening under vibrations and torque.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| PGMJ | 9.90 | ✅ | ✅ | ✅ |
Good quality materials:Metric thread,made of high quality zinc alloy, hardness of high resistance to rust, wear and corrosion-resistant environmental protection and aesthetic characteristics
Package include: 7 sizes include M4*10, M5*10, M6*10, M6*15, M8*15 M8*20, M10*25, total 130 pieces in a transparent box with can meet your different needs
Usage and install: pre-drill a proper hole, screw in with internal hex tool; Unique self-tapping designed external thread, contribute to tapping, with good tensile resistance, install with hex key, tapered external threads makes it not easy to pull out caused by vibration
Wide application: suit for soft woods such as pine, plywood, fiberboard, etc., such as ready-to-assemble furniture, drawer pulls, display case, and shipping crates，have a good effect in the furniture combination
The compartments in the box are movable, and they are are also installed underneath the box, after the tool is used up ,you can pack other things in a box, and you can freely use the compartments and recycle them
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Diameter: 5/8"
Thickness: 49/64 inches
Material: Steel
Finish: Zinc
Driver Type: 15/16" Wrench
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| WindFly | 9.78 | ✅ | ✅ | ✅ |
- Hole diameter: 2mm/ 0.08"; - Pitch: 0.45mm;
- Material: 4.8 Grade Carbon Steel ; - Weight: 30g;
- Package: 100 x M2.5 Nylon Lock nuts; - Color: Black;
- Used for: matching screws & matching bolts.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Diameter: 9/16"
Thickness: 31/64 inches
Material: Steel
Finish: Zinc
Driver Type: 7/8" Wrench
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| GVN Online | 9.90 | ✅ | ✅ | ✅ |
Thread Size: 12mm; Thread Pitch: 1.5mm; Thread Type: Fine Thread; Thread Coverage: Full Thread
Hex Drive Size: 19mm; Package: 10 pieces
Material: 304 stainless steel (A2-70) and no exterior finish, greater strength and corrision resistance performance than regular stianless steel or zinc plated fasteners.
Nut Heigth: 12mm; Width from point to point of the head: 21mm; Feel free to contact us if you have no idea about what size to choose.
The nylon insert helps grip the screw thread to prevent from loosening. You could also find the matched screws with different head types in our shop with a very reasonable price.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Diameter: 7/16"
Thickness: 15/32 inches
Material: Steel
Finish: Yellow Zinc
Driver Type: 5/8" Wrench
Diameter: 7/16"
Material: Steel
Finish: Yellow Zinc
Driver Type: 5/8 Wrench
Thread Type: 20 (Fine)
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Hard-To-Find Fastener | 3 |
| Binifimux | 2 |
| Eastlo | 1 |
| Fastenere | 1 |
| Glvaner | 1 |
| Pgmj | 1 |
We've carried out a comprehensive analysis of 1,508 reviews on locknuts, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select locknuts priced around $10.44, with top brands including e-z lok, aspen hardware-locknuts, glvaner, hard-to-find fastener, bayidun, binifimux, eastlo and mewudecor and swpeet
Our team of expert editors reviewed these high-quality items and handpicked the top 9 locknuts for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include aspen fasteners llc, gvn online, amazon.com, babaorui, windfly, eastlo and mewudecor online and swpeet .
We are dedicated to assisting our users in finding the right locknuts Products based on their needs, saving them considerable time when choosing which locknuts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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