Rivet Nut (Nutsert) Drill Size Chart: Marson MTS Series
Quick answer: the correct hole depends on the rivet-nut series and the material thickness. For Marson MTS Thread-Serts, a 1/4-20 insert uses a 3/8-inch drill in the catalog’s 0.0937-0.1562-inch material range and 25/64 inch in the thicker-material column. Do not apply one drill size to every insert sold under a matching thread size.
Marson MTS Thread-Sert Drill Sizes
This table is limited to the Marson MTS series and the two material-thickness bands shown in the manufacturer catalog. It is not a universal chart for other rivet-nut brands, body styles, or product series. The catalog gives drill sizes; use the corresponding product page or package to confirm the insert and its grip range before drilling.
| 6-32 UNC | #2 | A (0.234 in) |
|---|---|---|
| 8-32 UNC | 1/4 in | G (0.261 in) |
| 10-24 UNC | 9/32 in | L (0.290 in) |
| 10-32 UNF | 9/32 in | L (0.290 in) |
| 1/4-20 UNC | 3/8 in | 25/64 in |
| 5/16-18 UNC | 1/2 in | 33/64 in |
| 3/8-16 UNC | 9/16 in | 37/64 in |
7 rows
Scroll horizontally to view all columns.
Before Drilling
- Identify the insert manufacturer, series, thread, and grip range.
- Measure the parent material and select the matching thickness column.
- Check the catalog for the exact hole diameter and drill-size tolerance.
- Test the fit on scrap of the same material and thickness when practical.
- Deburr the hole and use the matching installation tool and mandrel.
A hole that is too large can let an insert spin or pull out; an undersized hole can prevent proper installation. For a different product series, follow that manufacturer’s drawing or installation instructions instead.
Related references: bolt wrench sizes, socket sizes, and American wrench sizes.
Source
Hole and drill sizes are from the Marson Full Line Catalog, MTS Series Thread-Sert table.
