Material | Code | Thread Size in Metric | Thread Size in Unified |
Steel with Zinc Plated | BSO/SO | M3-M5 | #4-40 ~ #10-32 |
Stainless Steel 303 | BSOS/SOS | M3-M5 | #4-40 ~ #10-32 |
Stainless Steel 410 | BSO4/SO4 | M3-M5 | #4-40 ~ #10-32 |
Aluminum | BSOA/SOA | 3.1 - 5.1 | 0.116" ~ 0.194'' |
For thin sheet | TSO/TSOA/TSOS | M2-M3.5 | #2-56 ~ #6-32 |
Lengt is available.