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These Type 316 stainless steel hex head bolts (1/4-20 x 1/2", pack of 25) deliver premium marine-grade corrosion resistance and durability. Designed with coarse threading and a standard hex head, they provide reliable fastening in saltwater and chemical environments, making them the go-to choice for professionals and enthusiasts who demand long-lasting performance.
| ASIN | B01NBJT5OR |
| Best Sellers Rank | #52,127 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #201 in Hex Bolts |
| Brand | Marine Bolt Supply |
| Compatible Groove Diameter | 0.25 Inches |
| Customer Reviews | 4.6 4.6 out of 5 stars (122) |
| Drive System | External Hex |
| Exterior Finish | Stainless Steel |
| Fastener Size | 1/4-20 x 1/2" |
| Fastener Type | Hexagon Bolt |
| Finish Types | Glossy |
| Grade Rating | Marine Grade |
| Head Type | Hex |
| Item Diameter | 0.25 Inches |
| Item Hardness | marine grade |
| Manufacturer | CMC Industrial Supply |
| Manufacturer Grade | Grade 316 |
| Material Type | Type 316 Stainless Steel |
| Number of Pieces | 25 |
| Part Number | 6-FHC |
| Screw Head Style | Hex |
| Screw Point Style | Hex |
| Size Name | 1/4-20 x 1/2" |
| Thread Class | 1B |
| Thread Coverage | Partially Threaded |
| Thread Size | 1/4"-20 |
| Thread Style | Coarse |
| Thread Type | Coarse Threaded |
| UPC | 634385957132 |
| Unit Count | 25 Count |
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
2 weeks ago
2 months ago