For a 5/8-inch fine-thread bolt, these Grade 8 steel hex cap screws have a 5/8-18 thread and come in lengths from 1-1/2 to 4 inches. The best choice depends on the required bolt length and quantity: choose the 1-1/2-inch option for shorter assemblies, the 1-3/4-inch 10-pack for a larger quantity, or a longer screw when the application requires more reach. Confirm the thread and length before ordering.
| Product | Length | Pack | Best For |
|---|---|---|---|
| Grade 8 Hex Cap Screws | 1-1/2 inches | 4 | Shorter assemblies |
| Grade 8 Hex Cap Screws | 1-3/4 inches | 10 | Buying several screws |
| Grade 8 Hex Cap Screws | 2-1/2 inches | 4 | Mid-length applications |
| Grade 8 Hex Cap Screws | 3 inches | 4 | Longer reach |
| Grade 8 Hex Cap Screws | 4 inches | 4 | Applications needing the longest listed option |
Grade 8 Hex Cap Screws, 1-1/2 Inch
This four-piece set contains Grade 8 fine-thread hex cap screws made from steel. Each screw is 5/8 inch in diameter and 1-1/2 inches long, with a 5/8-18 thread size.
Best for: Buyers who need the shortest length in this selection for an assembly with limited space. It was selected as the most compact option while retaining the specified 5/8-18 fine thread.
Consider: The 1-1/2-inch length may not provide enough reach for thicker materials or assemblies that require more thread engagement. Check the required length before choosing.
Grade 8 Hex Cap Screws, 1-3/4 Inch
This bulk pack includes 10 steel Grade 8 hex cap screws. The listed diameter is 5/8 inch, the length is 1-3/4 inches, and the thread specification is 5/8-18.
Best for: Buyers who need more pieces than the four-screw sets provide and whose application calls for a 1-3/4-inch bolt. It is the only 10-pack among these five choices.
Consider: This is a specific length, not an adjustable option. Avoid choosing it based only on pack size if your assembly requires a different bolt length.
Grade 8 Hex Cap Screws, 2-1/2 Inch
This four-piece set has steel Grade 8 hex cap screws measuring 5/8 inch in diameter and 2-1/2 inches in length. The stated thread size is 5/8-18, the fine-thread specification shared by the products in this selection.
Best for: Buyers who need a middle-length choice between the 1-3/4-inch and 3-inch options. It was selected to offer a distinct length for assemblies that need more reach than the shorter screws.
Consider: The package contains four screws. If you need more pieces, compare the quantity with the 10-pack option and confirm that its different length will work.
Grade 8 Hex Cap Screws, 3 Inch
These steel Grade 8 hex cap screws are 5/8 inch in diameter and 3 inches long. The product listing specifies a 5/8-18 fine thread and a four-piece quantity.
Best for: Buyers who need a longer screw than the 2-1/2-inch option but do not need the 4-inch length. The 3-inch size gives this selection a useful intermediate choice among the longer products.
Consider: The product information provided does not state a pack size, so verify the listing details if quantity is important before ordering.
Grade 8 Hex Cap Screws, 4 Inch
This four-piece set contains steel Grade 8 hex cap screws with a 5/8-inch diameter and a 4-inch length. The listed thread specification is 5/8-18.
Best for: Buyers who need the longest screw among the five listed products. It was selected for assemblies that call for a 4-inch length rather than one of the shorter alternatives.
Consider: A longer bolt is not automatically a better fit. Avoid this option if 4 inches would extend too far beyond the assembled materials or fail to suit the intended fastening setup.
Buying Guide: Choosing a 5/8 Fine-Thread Bolt
What does 5/8-18 mean?
In the listed product specifications, 5/8 inch identifies the bolt diameter and 18 identifies the fine-thread specification. Match both details to the fastener required by the mating part. A similar diameter with a different thread may not fit correctly.
How do you choose the right length?
Compare the required bolt length with the combined thickness of the materials being joined and the fastening arrangement. These products range from 1-1/2 to 4 inches. Select the length specified for your application rather than assuming a longer screw will work.
Does the pack quantity matter?
Yes. The 1-3/4-inch product is listed as a 10-pack, while the 1-1/2-, 2-1/2-, and 4-inch options are listed as four-piece sets. The 3-inch listing’s supplied details do not specify quantity, so check its listing if you need to confirm how many are included.
What material and grade are listed?
All five products are described as steel Grade 8 hex cap screws. Use the grade and material required by the application, and consult the relevant assembly specifications when fastener requirements are safety-critical.
Frequently Asked Questions
Are these bolts 5/8-18 fine thread?
Yes. Each supplied product description identifies the screws as 5/8-18, with a 5/8-inch diameter and 18-thread specification.
Which option has the most screws?
The 1-3/4-inch product is listed as a pack of 10. Several other options are listed as four-piece sets.
Which listed bolt is the longest?
The 4-inch Grade 8 steel hex cap screw is the longest option in this selection.
Are these products made of steel?
Yes. Steel is specified in the provided features for each product.