| Thread | Recommended Anvil Dimensions (mm) | |||
| A ±0.05 | B Nom | C +0.03 | R Max | |
| M3 | 5.05 | 6.63 | 0.23* | 0.08 |
| M3.5 | 5.54 | 7.11 | 0.23* | 0.08 |
| M4 | 6.17 | 7.75 | 0.23* | 0.08 |
| M5 | 7.34 | 8.89 | 0.23* | 0.08 |
*It is recommended that the anvil is replaced when the C dimension is reduced to 0.13mm due to tooling wear to avoid performance degredation.
First punch or drill the correct size hole. DO NOT deburr the hole prior to installation as this will remove material required during the clinching process. It is preferable to install the fastener from the side of the panel with the burring or blow through. Minimise local work hardening by punching holes with tooling in good condition.
Place the fastener in the hole like in the diagram above making sure the part is seated squarely.
Apply a parallel squeezing force until the head is seated against the panel with no serrations visible. Do not over squeeze the fastener into the panel as this could result in the threads being crushed.
A special punch/pilot pin combination to align the nut and a special staking ring anvil to aid displacing material into the clinch feature is highly recommended to achieve a proper installation.
A flat punch and anvil can be used but optimum installation/performance may not be achieved.
When installing Self Clinching fasteners, please pay attention to the minimum hole centerline to edge and parent material hardness limitations.
For special applications or if you are unsure of any aspect about the usage or installation of this fastener, give our sales office a call and we will do our best to offer you a solution or give advice on your application. Tel: +44 (0) 1302 836010 e-mail: sales@npfasteners.com
A list of common installation problems and solutions for Self Clinching fasteners can be found here.
