Best 8-32 Carriage Bolt Alternatives for Common Fastening Projects
No listed product has an 8-32 thread, so none is a direct match for a project that requires that exact size. The closest options include a 10-32 fine-thread stainless steel bolt, a #10-24 zinc-plated set, and larger metric or 3/8-inch carriage bolts. Choose by matching thread diameter, pitch, length, material, and application—not by appearance alone.
| Product | Best For | Key Difference |
|---|---|---|
| Fastener Cart 10-32 | Fine-thread stainless applications | Closest listed thread style, but larger than 8-32 |
| Hillman #10-24 | Wood-to-wood or wood-to-metal fastening | Zinc-plated, coarse-thread set with nuts |
| Glvaner M8-1.25 | Metric hardware projects | Includes nuts and washers |
| Makers Bolt 3/8 x 8 Black | Long exterior fastening | Ceramic-coated, 8-inch bolt |
| Makers Bolt 3/8 x 8 Galvanized | Bulk exterior projects | Hot-dip galvanized, 50-pack |
Fastener Cart 10-32 Stainless Carriage Bolts
Best for: Buyers who need a fine-thread carriage bolt in stainless steel and can use 10-32 rather than 8-32. This 25-piece set is made from 18-8 stainless steel, and the listing describes the bolts as quality-control inspected and lot controlled.
Among these choices, this is the closest thread-style alternative because 10-32 is also a fine thread. However, its diameter is larger than an 8-32 bolt, so it should not be treated as a direct replacement in a hole or assembly designed for 8-32 hardware.
Limitation: The listed details do not specify included nuts or washers. Confirm whether those components are needed before ordering.
Hillman Zinc-Plated #10-24 Carriage Bolt Set
Best for: Wood-to-wood or wood-to-metal fastening where a #10-24 coarse-thread bolt is suitable. The 24-pack includes nuts, and its smooth, flat head is intended to sit against the material. The square underside of the head helps resist spinning as the nut is tightened.
Choose this set for common fastening tasks such as decking, fencing, or timber framing when the project calls for its listed size. Its self-locking square neck can make installation more straightforward because the bolt head does not require a driving tool to keep it from rotating.
Limitation: #10-24 is not 8-32, and the zinc-plated finish is not the same as stainless steel or hot-dip galvanizing.
Glvaner M8-1.25 Stainless Carriage Bolt Kit
Best for: Metric projects that call for M8-1.25 hardware and a complete small kit. The package contains 10 M8-1.25 x 30 mm carriage bolts, 10 matching hex nuts, and 10 flat washers. The bolts are listed as 304 stainless steel, also described as 18/8, with coarse threads and a 1.25 mm pitch.
The included nuts and washers make this a convenient option when a project uses this metric size. The listing also gives a 30 mm screw length, including the neck, and provides head dimensions for checking clearance.
Limitation: M8 is a metric size and is not interchangeable with 8-32. Verify the required thread system and length before choosing it.
Makers Bolt 3/8 x 8 Black Carriage Bolt Kit
Best for: Exterior projects that require long, heavy-duty-style 3/8 x 8-inch carriage bolts rather than small machine-thread hardware. The listing specifies a 25-pack, Grade 307A bolts, and a ceramic coating for exterior use. It describes the coating as offering twice the rust resistance of galvanized finish.
Choose this option when the project specifically requires the stated diameter and 8-inch length and the black finish suits the application. It is a substantially larger fastener than 8-32, so it serves a different scale of construction task.
Limitation: These bolts are not substitutes for 8-32 screws. The provided details do not list included nuts or washers.
Makers Bolt 3/8 x 8 Galvanized Carriage Bolts
Best for: Larger outdoor builds that need a 50-pack of 3/8 x 8-inch bolts with a hot-dip galvanized finish. The listing identifies these as Grade 307A and specifies exterior use. The larger pack is useful when a project has many fastening points or calls for spare hardware.
Compared with the black ceramic-coated kit, choose this option if hot-dip galvanizing is the finish requirement. Match the bolt length and diameter to the materials and assembly plan before buying.
Limitation: The 3/8-inch diameter and 8-inch length are far larger than 8-32 hardware. The supplied details do not state that nuts or washers are included.
Buying Guide: How to Choose Carriage Bolts
Does the project require an exact 8-32 thread?
Check the hardware specification before substituting. In 8-32, “8” identifies a small screw size and “32” indicates 32 threads per inch. None of the listed products has that thread. A 10-32 bolt has a similar fine-thread designation but a different diameter, while #10-24 has a different pitch. Either may fail to fit an existing hole or nut.
How should you compare thread systems and dimensions?
Match the full designation, not just a single number. Metric M8-1.25 uses a metric diameter and pitch, while inch-series sizes use numbered diameters and threads per inch. Also check bolt length and whether the measurement includes the neck. For a replacement, confirm the mating nut, hole size, material thickness, and available clearance.
Which finish is appropriate for the setting?
Choose material and coating based on the environment and project requirements. The options here include 18-8 stainless steel, zinc plating, ceramic coating, and hot-dip galvanizing. The listings describe the intended finishes, but they do not establish that one finish is suitable for every exposure condition. Follow the project specification when corrosion resistance matters.
Do you need a kit or a bulk pack?
A kit with matching nuts and washers can reduce the need to source separate pieces; the Glvaner set explicitly includes both. Other listings may include nuts, but their supplied details do not confirm washers. For multi-point projects, compare the listed pack quantities and verify which companion hardware is included.
Frequently Asked Questions
Is any product listed an 8-32 carriage bolt?
No. The listed thread sizes are 10-32, #10-24, M8-1.25, and 3/8-inch bolts.
Can a 10-32 carriage bolt replace an 8-32?
Not as a direct fit. A 10-32 bolt has a larger diameter, so it may not fit an opening or nut made for 8-32.
What does 8-32 mean?
It refers to a number 8 screw size with 32 threads per inch. Confirm the required dimensions against the project or existing hardware.
Which listed option includes nuts and washers?
The Glvaner M8 kit lists 10 matching nuts and 10 flat washers. The Hillman set lists nuts; the other provided product details do not specify included nuts and washers.
Which listed product is intended for exterior use?
The two Makers Bolt products are described for exterior use: one has a ceramic coating and the other is hot-dip galvanized.