| 摘要 |
<p>Snap-tool mass-producing bolts, screws, nails, rollers ball bearings It has an insert (1) for hot or cold forming bolts. The thins part of a back stop is slidably fixed in the through bore of the tool jacket. Its thicker part (2) has a smaller diameter than the bore in the tool head. One surface of (2) rests in the tool head cavity while the other surface is spaced from the jacket surface to give a clearance for excess material to be formed. The front surface of the thin part rests against the back surface of (1) in a blind hole.</p> |
