Expansion Fix
Unheaded (UHDEXPFIX) Headed (HDEXPFIX)
| Metric and Unified Dimensions | Brass / Self Colour | ||||||||
| Thread Size | Metric | M2* | M2.5* | M3 | M3.5 | M4 | M5 | M6 | M8* |
| Unified* | 2.56 UNC* | - | 4.40 UNC* | 6.32 UNC* | 8.32 UNC* | 10.24 UNC* | 1/4-20 UNC* | 5/16-18 UNC* | |
| 10.32 UNF* | 1/4-28 UNF* | 5/16-24 UNF* | |||||||
| L mm | 3.9 | 4.7 | 4.7 | 6.3 | 7.9 | 9.4 | 12.6 | 12.6 | |
| T mm | 0.43 | 0.51 | 0.51 | 0.66 | 0.82 | 0.99 | 1.25 | 1.25 | |
| H mm | 4.8 | 5.5 | 5.5 | 6.4 | 7.1 | 7.9 | 9.5 | 11.1 | |
| W mm max | 3.2 | 4.0 | 4.0 | 4.7 | 5.5 | 6.3 | 7.9 | 9.5 | |
| Recommended Hole Size Thermoplastics mm | 3.2 | 4.0 | 4.0 | 4.8 | 5.6 | 6.4 | 8.0 | 9.6 | |
| Recommended Hole Size Thermosets mm | 2.4 | 3.2 | 3.2 | 3.6 | 4.0 | 4.8 | 6.0 | 7.0 | |
* Non preferred - Please contact our sales team to enquire for availability.
Unified variations can be manufactured with either fine or coarse threads. Please state when enquiring.
All data is correct to the best of our knowledge, however Lancaster Fastener cannot be held responsible for any errors or omissions.
Expansion-Fix - Information for designers
The Expansion-Fix is a press-in insert, designed for post mould installation into thermosetsat. The knurl pattern makes this insert ideal for hard thermoses.
Advantages
Simple, press-in installation
Provides self-locking action on the mating screw
Good pull out and torque resistance
Installation Data
The Expansion-Fix should be installed with a press that can provide a steady squeezing action to prevent damage to the mating boss. It is important that the mating screw fully penetrates the insert to achieve full expansion and optimum pull-out resistance.
