What Does 8-32 Mean on a Screw?
Quick answer: In the Unified inch thread system, 8-32 means a #8 nominal screw diameter with 32 threads per inch. It commonly refers to a #8-32 UNC machine-screw thread; the length is stated separately.
Key points
- The #8 is a gauge designation, not 8 inches or 8 millimeters.
- The 32 indicates threads per inch.
- A matching #8-32 nut or tapped hole is required.
- Head style, length, grade and material remain separate specifications.
How to choose or use it
Do not force an 8-32 screw into a similar-looking metric or different-pitch hole. Use a thread gauge or known nut to verify uncertain hardware, and measure length according to head style.
Browse the relevant IMSCREWS product collection after confirming the required dimensions and specification.
Installation and safety checklist
- Confirm the receiving material, hole preparation and mating thread.
- Verify diameter, pitch, length, head, drive, material and finish.
- Use a well-fitting tool, keep it aligned and tighten only to the required seating or specified torque.
- For structural, overhead or safety-critical joints, follow the approved design, code and manufacturer data.