Metric partially threaded studs are useful when a fastener needs threaded ends with a smooth center section. The Hillman M6 stud is best for automotive or industrial assemblies where a Class 5.8 steel stud is specified. The uxcell M6 and M8 options suit general maintenance needs in 304 stainless steel, while the 25-piece M8 set is better for projects that need a larger supply. Compare diameter, length, pitch, thread-end length, material, and quantity before choosing.
| Product | Best For | Size and Material | Pack |
|---|---|---|---|
| Hillman M6 x 31 mm | Automotive and industrial assemblies | M6, Class 5.8 steel | 5 |
| uxcell M6 x 25 mm | Compact maintenance projects | M6, 304 stainless steel | 5 |
| uxcell M8 x 45 mm | General-purpose M8 repairs | M8, 304 stainless steel | 5 |
| uxcell M8 x 45 mm | Projects needing more M8 studs | M8, 304 stainless steel | 10 |
| uxcell M8 x 90 mm | Longer installations and larger jobs | M8, 304 stainless steel | 25 |
Hillman M6 x 31 mm Automotive Stud
This five-pack is best for automotive and industrial nut-and-stud assemblies that call for an M6 Class 5.8 stud. Hillman identifies the stud as cold-worked steel with a heat-treated finish and mild corrosion resistance. Its partially threaded shank has an unthreaded center that helps components slide together before fastening with a nut or washer.
Choose this option when the specified application calls for Class 5.8 steel and a partially threaded center. It is a more application-specific choice than the stainless maintenance studs in this list. The listed information does not provide thread-end lengths or a thread pitch, so confirm those details against the assembly requirements before ordering.
uxcell M6 x 25 mm Stainless Steel Studs
These five double-end studs are best for compact maintenance tasks that need an M6 fastener with stainless steel construction. Each stud is 25 mm long, with a 1 mm thread pitch and 10 mm of thread at each end. The 304 stainless steel material is described as corrosion resistant.
Choose this model when its short overall length and thread-end dimensions match the installation. It is smaller than the 31 mm Hillman stud and the M8 options, so it is not the right pick when a longer stud or larger M8 thread is required. Check the receiving part’s thread specification and available depth before installation.
uxcell M8 x 45 mm Stainless Steel Studs
This five-piece set is best for general maintenance that needs M8 double-end studs in a moderate length. Each stud measures 45 mm overall and has 15 mm of thread at each end. The M8 thread pitch is 1.25 mm, and the studs are made from 304 stainless steel with a silver-tone finish.
Choose this pack when five studs are enough and the 45 mm length suits the assembly. It offers the same stated size and material as the 10-piece M8 x 45 mm option, but includes fewer studs. The listed product details do not specify a strength grade, so avoid substituting it for a stud requiring a particular rated grade.
uxcell M8 x 45 mm 10-Piece Stud Set
This option is best for projects that require more M8 x 45 mm studs or a small supply for repeat repairs. The set contains 10 double-end studs made from 304 stainless steel. Each has a 1.25 mm pitch and 15 mm threaded sections at both ends, matching the dimensions of the five-piece M8 set.
Choose this pack over the five-piece version when the additional quantity is useful. It is not a longer alternative: its studs remain 45 mm overall. As with the other uxcell options, the supplied details do not state a strength grade, so confirm that the material and fastener specification suit any load-bearing or grade-specific use.
uxcell M8 x 90 mm Stainless Steel Studs
This 25-piece pack is best for larger jobs that need longer M8 double-end studs. Each piece is 90 mm long, with 32 mm of thread at each end and a 1.25 mm pitch. The 304 stainless steel construction is described as corrosion resistant. Its length and larger pack distinguish it from the 45 mm M8 options.
Choose this set when the assembly needs the longer reach and the project can use a larger quantity. Avoid it if the installation has limited clearance or requires a shorter stud. Confirm the available insertion depth and exposed length before selecting a 90 mm fastener.
Buying Guide: How to Choose Metric Partially Threaded Studs
Which diameter and pitch do you need?
Match the stud diameter and pitch to the tapped hole, nut, or equipment specification. The listed M6 options have a 1 mm pitch where specified; the M8 uxcell studs have a 1.25 mm pitch. Do not assume two metric threads fit together just because they share a nominal diameter. Check both measurements before ordering.
How should you compare length and threaded ends?
Overall length is not the same as usable thread length. The M6 uxcell stud is 25 mm long with 10 mm of thread per end. The M8 x 45 mm studs have 15 mm per end, while the M8 x 90 mm version has 32 mm per end. Compare the smooth center, insertion depth, and exposed length needed for your assembly.
When does material or grade matter?
Choose material based on the application specification and environment. The uxcell products are listed as 304 stainless steel. Hillman specifies Class 5.8 cold-worked steel and a heat-treated finish with mild corrosion resistance. These descriptions are not interchangeable strength ratings; use a specified grade when the equipment or repair instructions require one.
Is a partially threaded stud the same as threaded rod?
No. A partially threaded stud has threaded sections separated by an unthreaded center. Fully threaded rods have threads along their length. Choose a partially threaded design when the smooth shank is part of the required fit; choose all-thread only when continuous threading is needed and permitted by the application.
Frequently Asked Questions
What does partially threaded mean?
It means the fastener has threaded ends and an unthreaded section between them. The smooth section can help components align or fit together, depending on the assembly design.
Are M6 and M8 studs interchangeable?
No. M6 and M8 refer to different nominal thread diameters. Use the size specified for the tapped hole or mating hardware.
What is the thread pitch on the listed uxcell M8 studs?
The listed M8 uxcell studs have a 1.25 mm thread pitch. Their thread-end lengths vary by overall stud length.
Which listed stud is best for automotive use?
The Hillman M6 x 31 mm product is specifically described for automotive and industrial nut-and-stud assemblies. Confirm that its size and Class 5.8 specification match the repair requirements.
Should I choose stainless steel for every repair?
No. Select the material and grade required by the application. The listed stainless studs are described as corrosion resistant, while the Hillman product is specified as Class 5.8 steel; verify the correct fastener for the assembly.