| 摘要 |
A punch (9) for forming into a fastener head an open-ended slot, having a body portion (10) and a working tongue (12) which tongue imparts the configuration of the slot. A die (50) for supporting the fastener head having a body portion (51), a bore (55) located within the body portion for receiving the fastener blank to be worked by the punch. A method for forming a slot into the fastener head by (a) supporting the fastener head in the die (50) and (b) working the fastener head with the working tongue (12) of the punch (9) to form the slot. |
