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LN Self-Locking Fasteners from the PEM Fasteners catalogue, page 113.
| Property | Value |
|---|---|
| Thread Size | .250-20 (1/4-20) |
| Type | S |
| Thread Code | RT0420 |
| Shank Code | 0 |
| A (Shank) Max. | .045 in |
| Rec. Min. Sheet Thickness | .047 in |
| Hole Size In Sheet +.003 −.000 | .344 in |
| C Max. | .343 in |
| E ±.010 | .440 in |
| T ±.010 | .170 in |
| Min. Dist Hole ℄ To Edge | .34 in |