Taper Pin
Pins · taper pin
Definition: A taper pin is a solid pin with a uniform taper (1:48) that wedges into a reamed tapered hole, locking two parts together precisely.
Anatomy & Schematic
■ Shank■ Chamfered ends
Governing standards: ASME B18.8.2
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| No. 1 | — | 0.109 small end | 1/2–2 long |
| No. 4 | — | 0.193 small end | 1–3 long |
| No. 7 | — | 0.341 small end | 1-1/2–4 long |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| Steel | carbon steel | — | None |
| Stainless | 304 stainless | — | None |
Materials
- Carbon steel
- Stainless steel
- Brass
Pros & Cons
Pros
- Self-locking wedge fit
- Takes repeated assembly
- Precise alignment
Cons
- Needs a tapered reamer
- Drifts out under reverse load unless retained
- Less common today
Typical Uses
- Precision machine alignment
- Tapered reamed joints
- Cranks and levers
- Legacy machinery
Alternatives & Related
- Dowel Pin — Straight pin for press-fit location
- Grooved Pin — Retains itself in a straight hole
Where to Buy
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FAQ
What taper are taper pins?
Standard taper pins use a 1:48 taper (1/4 in per foot). Tapered holes are reamed with the matching tapered reamer.
Taper pin vs dowel pin?
A taper pin wedges into a tapered hole and locks by friction; a dowel pin is straight and press-fit for precise location.