Orbot hex grub screw, 3/8 inch x 1/4 inch, grade 8
A grade 8 hex socket grub screw from an Orbot machine.
Grade matters here
Grade 8 is a high tensile specification. Substituting a lower grade screw of the same size into a drive component is a false economy — it will hold until it does not, usually under load. Match the grade, not just the thread.
Identifying the right part
Fasteners and small components change between production runs, and the part on your machine may not match the current drawing. Measure what you are replacing, or photograph it against a ruler, and send that with your model and serial number. It takes a minute and it saves an order that does not fit.
Specifications
| Part | Hex socket grub screw (set screw) |
| Orbot part no. | HOSGRUBGR8 |
| Size | 3/8 inch x 1/4 inch as listed (thread form, e.g. UNC or UNF, not published) |
| Grade | 8 (high tensile) |
| Location on the machine | Not published — confirm with your model and serial number |
| Sold | Each |
Fitting Advice
- Clean the thread in the component before fitting.
- If the shaft has a flat, seat the screw on the flat.
- A thread-locking compound is common workshop practice on grub screws in vibrating assemblies. Use a grade that still lets the screw be removed for service.
- Do not reuse a grub screw with a rounded socket — replace it.
Frequently Asked Questions
Is 3/8 inch x 1/4 inch the diameter and length?
The listing gives the size as 3/8 inch x 1/4 inch. The usual convention is thread diameter first, then length, but measure the screw you are replacing to be sure.
Can I use a standard grade screw?
Not in a drive component. As above, match the grade as well as the thread.
See all Orbot parts.
Orbot part numbers are not always obvious from the machine. Send us the model, the serial number and a photograph of the part you need and we will confirm it before you order.
