













🔧 Lock in strength and style with every turn!
This 5-set kit features 5/16-18x4" fully threaded hex head bolts made from durable 18-8 (304) stainless steel, paired with matching hex nuts, fender flat washers, and split lock washers. Designed for heavy-duty fastening, these bolts offer excellent corrosion resistance and comply with ASME standards, making them ideal for demanding industrial and outdoor projects.





| ASIN | B07S7P1HB1 |
| Best Sellers Rank | #17,373 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #42 in Hex Bolts |
| Compatible groove diameter | 0.31 Inches |
| Date First Available | May 27, 2019 |
| Finish Type | Plain |
| Head Style | Hex |
| Item Diameter | 0.31 Inches |
| Item Weight | 8.1 ounces |
| Item model number | 1 |
| Manufacturer | Fullerdongluo |
| Number of Pieces | 5 |
| Shape | Cylindrical |
| Thread Size | 5/16"-18 |
| UPC | 799862376933 |
A**R
Awesome bolts!
I recently needed a robust fastening solution for a project that required strength and corrosion resistance, and this 5/16-18x1-1/4" Stainless Steel Hex Head Screw and Nut Kit with 5/16 Nuts and 5/16 Fender Flat Washers proved to be exactly what I needed. I'm extremely impressed with the quality and performance of these fasteners. Right out of the box, you can tell these are made to last. The stainless steel construction is top-notch, giving them excellent resistance to rust and corrosion, which is crucial for outdoor and other demanding applications. What really stood out to me was how incredibly strong these screws and nuts are. I put them to the test in a demanding application, and they held up flawlessly. There was no stripping, bending, or any signs of weakness, even under significant stress. The inclusion of the fender washers is a great bonus. They provide a wider bearing surface, distributing the load more evenly and preventing damage to the materials being fastened. This added stability and security is a big plus. The threads on the screws are clean and precisely cut, making for smooth and easy installation. The nuts fit perfectly, and the whole assembly feels incredibly solid and secure once tightened. If you're looking for a reliable and incredibly strong fastening solution, especially one that can withstand harsh conditions, I highly recommend this 5/16-18x1-1/4" Stainless Steel Hex Head Screw and Nut Kit. The quality and strength of these fasteners are exceptional, and they've exceeded my expectations in every way. Great set of bolts!
E**N
Good product
What I need
W**W
Good item
Appears to be a good product and it should work well.
H**D
Having extra nuts and bolts is good
When I find a deal on nuts and bolts I buy them
D**R
One stop shop
These were the perfect size for installing my boat seats and MUCH cheaper than the bid box stores! I would have paid almost triple, IF I could have even found 10 of everything I needed!!
S**E
Why stainless?
Wonerful. Rebuilt my manure wheelbarrow with stainless bolts so when things break it is a much easier repair.
W**A
Nice bolt sets, packaged well, arrived quickly.
We're using this for customizing a hot tub and due to the chlorine and massive amounts of water, stainless was the best option. These arrived quickly and proved to be perfect for our application. The ratcheted up nice and tight, without breaking or stripping and being stainless, rust and corrosion are not a concern. The price for 10 sets is quite fair, so it's safe to say these are good bargain for a specialty fastener.
K**K
they are perfect
these are good, nothing wrong with them
G**.
Ordered these when I rebuilt my golf cart. Stainless steel is the way to go when subject to exposure to the elements. Happy with my purchase
K**1
These bolts fit the muffler on my 8hp tecumseh engine on mtd built craftsman snowblower.
S**S
They're as advertised.
A**R
Ok
D**E
Needed 4 to replace 4 that weren't strong enough (holding springs in a frame). So far these are and very convenient not having to source matching nuts and washers
Trustpilot
2 weeks ago
3 weeks ago