Trade · 6 pages · 12 min
Why screw threads are a trade agreement
A shared thread form agrees the shape and spacing so one maker's screw can take another's nut.
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From the opening
A screw thread is a ridge wrapped around a cylinder, and its value in trade is that many shops cut the same ridge. Agreement on the angle, the depth, and the spacing is what lets screws, nuts, and tapped holes from different makers run together. The opening covers profile and pitch must agree, tolerances still allow a running fit, and strength is a separate specification.
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Inside
- Profile and pitch must agree
- Tolerances still allow a running fit
- Strength is a separate specification
- Rival thread systems do not mate
- Where the idea stops applying
- A distinction worth keeping
Sources
- Whitworth screw thread
- Metric screw thread interchangeability