Best 1/4-28 Fine Thread Bolts for Common Fastening Needs
The best 1/4-28 fine thread bolt depends on the required length, head style, strength grade, and quantity. For bulk projects and high-torque applications, the Grade 8 hex cap screws in 3/4-inch or 1-inch lengths are the most directly specified choices. The Grade 5 zinc hex screws suit buyers seeking a smaller pack, while the 1-1/2-inch socket cap and 4-inch Grade 8 hex screw cover different head-style and length needs.
| Product | Size | Best For |
|---|---|---|
| Grade 8 hex cap screws, pack of 50 | 1/4-28 x 3/4 in. | Bulk, high-torque fastening |
| Grade 5 zinc hex cap screws | 1/4-28 x 3/4 in. | Smaller quantity and zinc finish |
| Fine socket cap screws | 1/4-28 x 1-1/2 in. | Socket-cap head and added length |
| Grade 8 fine hex cap screws | 1/4-28 x 4 in. | Long-reach fastening |
| Grade 8 hex cap screws, pack of 50 | 1/4-28 x 1 in. | Bulk use with a longer bolt |
Grade 8 Hex Cap Screws, 3/4 Inch
This bulk pack contains 50 steel Grade 8 hardened hex cap screws measuring 1/4-28 by 3/4 inch. The listed features emphasize fine threading for precise fastening and high-torque applications, with a hex head designed to allow greater torque application than a circular cap.
Best for: Buyers who need multiple short fine-thread bolts for a project and want the product’s stated Grade 8 construction. Choose this option when a 3/4-inch length fits the material stack and a hex head is appropriate.
Limitation: The pack may be more than needed for a one-off repair. Confirm the required bolt length before ordering.
Grade 5 Zinc Hex Cap Screws
These steel Grade 5 hex cap screws have a listed zinc finish and measure 1/4 inch in diameter by 3/4 inch long. The listing identifies a 12-piece quantity. Its size matches the 1/4-28 fine-thread format, making it a direct option for buyers who need this length in a smaller pack.
Best for: Buyers looking for a 3/4-inch fine-thread hex cap screw in a 12-piece quantity, or specifically seeking the listed zinc finish. It is a different grade and pack size from the Grade 8 bulk option.
Limitation: The provided features do not describe a high-torque use claim. Choose another option if Grade 8 is a required specification.
Fine Socket Cap Screws, 1-1/2 Inch
This 12-piece set is listed as steel fine socket cap screws with a 1/4-inch diameter and 1-1/2-inch length. The product name specifies 1/4-28, so buyers can compare its fine-thread size with their existing fastener or threaded hole.
Best for: Buyers who need a longer bolt than the 3/4-inch options and want a socket cap head rather than a hex cap head. Consider it when the 1-1/2-inch length and socket-head format fit the assembly.
Limitation: The provided product features do not specify a strength grade or finish. Do not assume either; check the listing details if those specifications are essential.
Grade 8 Hex Cap Screws, 4 Inch
This steel Grade 8 fine hex cap screw is listed at 1/4 inch in diameter and 4 inches long. The pack contains five pieces. Its extended length distinguishes it from the shorter bulk options, while its hex cap style is suited to applications that call for a hex-head fastener.
Best for: Buyers whose assembly specifically requires a 4-inch-long 1/4-28 Grade 8 hex cap screw. The five-piece pack may also suit a repair or smaller project that does not need dozens of bolts.
Limitation: Its 4-inch length is substantially longer than the other choices. Verify the required grip and overall length to avoid selecting an unnecessarily long fastener.
Grade 8 Hex Cap Screws, 1 Inch
This pack includes 50 Grade 8 hardened steel hex cap screws sized 1/4-28 by 1 inch. The listing describes fine threading for precise fastening and higher tensile strength in fastenings, as well as a hex cap that allows greater torque application than a circular cap.
Best for: Buyers who need a bulk supply of Grade 8 fine-thread bolts and require a 1-inch length. Choose it over the 3/4-inch bulk pack when the extra quarter inch is needed for the assembly.
Limitation: The 50-piece quantity may not suit a small repair. Match the length to the materials being joined rather than choosing by quantity alone.
Buying Guide: How to Choose a 1/4-28 Fine Thread Bolt
What does 1/4-28 mean?
The size identifies a nominal 1/4-inch diameter and 28 threads per inch. Check that the mating nut or threaded hole is designed for the same thread size. A bolt that has the right diameter but a different pitch may not fit correctly.
Which length should you choose?
Compare the bolt’s listed length with the thickness of the materials and the fastening arrangement. These options range from 3/4 inch to 4 inches. Consider how much threaded engagement the assembly needs, and avoid assuming that a longer bolt is automatically a better fit.
Does the head style matter?
Yes. Four listed products are hex cap screws, while the 1-1/2-inch option is a socket cap screw. Select the style that suits the available tool access and the assembly’s design. The product data specifically describes the hex heads as allowing greater torque application than circular caps.
Should you choose Grade 5 or Grade 8?
Choose a grade based on the requirements of the application, not on grade alone. The listings identify some products as Grade 5 and others as Grade 8; the Grade 8 bulk options also describe hardened steel and high-torque applications. If a project specifies a grade, follow that requirement and verify the complete fastener specification.
How many bolts do you need?
The available quantities are five, 12, and 50 pieces. A smaller pack can make more sense for a repair or a less common length. Bulk packs are better suited to repeat work or projects that require many matching fasteners.
Frequently Asked Questions
Is 1/4-28 a fine thread?
Yes. In this product list, 1/4-28 is identified as a fine-thread size with 28 threads per inch.
Are all the listed bolts the same length?
No. The listed lengths are 3/4 inch, 1 inch, 1-1/2 inches, and 4 inches. Check the individual product size before selecting one.
Which option comes in a 50-piece pack?
The Grade 8 hex cap screw options measuring 3/4 inch and 1 inch are listed in packs of 50.
Which product has a zinc finish?
The 12-piece Grade 5 hex cap screw listing specifies a zinc finish. The provided features for the other products do not specify a finish.
Are socket cap and hex cap screws interchangeable?
They have different head styles. Compare the fastener required by the assembly and the available tool access rather than assuming the two styles are interchangeable.