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🔩 Lock in strength, resist the elements — bolts that never quit!
These Type 316 stainless steel hex head bolts (1/4-20 x 1/2", pack of 25) deliver marine-grade corrosion resistance and durability. Designed with coarse threads and a hex head for secure fastening, they excel in saltwater and chemical environments where standard bolts fail. Trusted by professionals and outdoor enthusiasts alike, these bolts combine premium material quality with practical bulk packaging for versatile industrial and DIY applications.
| ASIN | B01NBJT5OR |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #54,761 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #203 in Hex Bolts |
| Brand | Marine Bolt Supply |
| Customer Reviews | 4.6 4.6 out of 5 stars (120) |
| Cutting Diameter | 0.25 Inches |
| Date First Available | December 12, 2016 |
| Exterior Finish | Stainless Steel |
| Fastener Type | Hexagon Bolt |
| Finish | Glossy |
| Head Style | Hex |
| Head Type | Hex |
| Is Discontinued By Manufacturer | No |
| Item Diameter | 0.25 Inches |
| Item Hardness | marine grade |
| Item Package Quantity | 25 |
| Manufacturer | CMC Industrial Supply |
| Manufacturer Grade | Grade 316 |
| Material | Type 316 Stainless Steel |
| Measurement System | Inch |
| Number of Pieces | 25 |
| Part Number | 6-FHC |
| Shape | Hexagonal With Cylindrical Body |
| Size | 1/4-20 x 1/2" |
| Thread Class | 1B |
| Thread Size | 1/4"-20 |
| Thread Style | Coarse |
| Thread Type | Coarse Threaded |
| Tool Tip Description | Hex |
| UPC | 634385957132 |
M**G
True 316 Stainless Steel
316 stainless is my go to finish for anything that you need to use outdoors. Don’t be fooled, 307 stainless will rust. I live on a lake and these are a must. I always purchase from Marine Supply.
E**K
Strong bolts for what i needed
Needless to say these bolts helped hold down a Ducati to two pieces of attic board and an 80 dollar motorcycle chock from Amazon and I only used hand tools to crank down the bolts
T**D
Exactly as expected
Received expected product. No complaints.
J**E
Exelent
Exelent
P**D
Quality stainless steel bolts
I needed stainless steel bolts that were 1-1/4" long for use with concrete drop-in anchors for swimming pool safety rail installation. This is not a length readily available at Home Depot, Lowes, or my local hardware store and so I ordered via Marine Bolt Supply. They appear to be of very high quality and did the job. I am a mechanical engineer by training and have seen some poor quality hardware evidently sourced from questionable suppliers but these bolts were perfect.
B**D
Used as replacement keel bolts for a Catalina 22 Swing ...
Used as replacement keel bolts for a Catalina 22 Swing Keel. Replacing these 4 bolts every couple years is cheap insurance!
L**T
Great quality product at a very good price
DIY Projects and repairs to replace some rusting bolts
A**R
Misleading Photos
Misleading photos, the bolts I purchased showed the unthreaded section as 1/4 of the shaft, the bolts that I received are threaded on half of the shaft. Hopefully I can still use them.
Trustpilot
3 weeks ago
1 month ago