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Taper Pin Spec Table
Taper Pin Specifications — 24 sizes
KS B 1321ISO 2339JIS B 1352DIN 1
A tapered (conical) pin driven into a hole for strong retention, used for precise positioning.
Practical Notes
- 1:50 taper requires tapered reaming. Standard drilled holes only contact the tip, providing insufficient holding force.
- Strike from the small-diameter end to remove. Hitting the wrong end drives the pin deeper, making removal impossible.
Selection Guide
1:50 taper provides self-locking on insertion. Requires tapered reaming; removed by striking the opposite end. Compensates wear on reassembly, maintaining tight fit. Used for handle-shaft locking and precision positioning in legacy machinery.
KSISOJISDINTaper Pin
6 sizesThe dimensions below are identical across KS B 1321 · ISO 2339 · JIS B 1352 · DIN 1.
| Nominal | d | L | Tolerance | Material | Standard |
|---|---|---|---|---|---|
| 1×20 | 1 | 20 | 1:50 | S45C | KS B 1321 |
| 2×25 | 2 | 25 | 1:50 | S45C | KS B 1321 |
| 3×30 | 3 | 30 | 1:50 | S45C | KS B 1321 |
| 4×40 | 4 | 40 | 1:50 | S45C | KS B 1321 |
| 5×50 | 5 | 50 | 1:50 | S45C | KS B 1321 |
| 6×60 | 6 | 60 | 1:50 | S45C | KS B 1321 |
Key Features
- 1:50 taper provides self-locking on insertion; removable by striking opposite end
- KS B 1321 / ISO 2339; tapered reaming required
- Maintains tight fit on reassembly; compensates for wear
Key Applications
Handle-shaft locking, pulley hubs, legacy machine maintenance, rudder pins, mining equipment connections
FAQ
What is the taper ratio of taper pins?
1:50 is standard — 2mm diameter difference over 100mm length. This taper provides the self-locking effect.