| 摘要 |
The tubular fastener has an axially extending tubular shank receivable in a work bore and an annular head receivable in forcible engagement with the work material forming a counterbore. The fastener also has, on the head, an annular end face, a tapered section located forwardly of the end face to forcibly engage the work counterbore and a second forwardly tapered section located forwardly of the first section. The taper angularity of the second section exceeds the taper angularity of the first. A stem extends through the tubular shank and head. An actuator plug responsive to retraction of the stem toward the head end of the fastener to expand at the opposite end of the fastener and axially retain it in position.
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