Plain, internally and externally threaded taper pins turned on CNC lathes — in the sizes, tapers and materials no catalog stocks. Imperial, non-standard and obsolete pins reproduced from your worn sample.
Standard taper pins in common metric and inch sizes are stocked and cheap — an honest supplier tells you to buy those first. Here's the line we draw before quoting:
A standard DIN 1 or DIN 7978 pin in a common size and steel or 304. Fastener specialists and industrial supply stores stock these — buy them from stock there, they'll ship fast and cheaper than made-to-order, or contact us: we may have them in stock.
A non-standard length or large-end diameter, an imperial pin for older or American machinery, a non-1:50 taper, an exotic material — 316L, brass, titanium — or a replacement for a worn or obsolete pin with no size marking. Those are CNC turning jobs.
Worn pin, dead machine, no drawing? That's exactly what we're for — send the old pin and we reproduce it from the sample. See also obsolete & discontinued fasteners.
| Type | How it works | Standard |
|---|---|---|
| Plain taper pin | Smooth 1:50 taper, driven into a reamed taper hole | DIN 1 / ISO 2339 |
| Internally threaded | Tapped large end for a puller — removes from blind holes | DIN 7978 / ISO 8736 |
| Externally threaded | Threaded stub and nut on the large end for extraction | DIN 7977 / ISO 8737 |
| Grooved / split | Grip grooves to hold in an un-reamed hole | To drawing |
| Imperial / obsolete | Inch tapers and legacy sizes matched from a sample | BS 46, ANSI B18.8.2 |
Every dimension floats: large-end diameter, length, taper and thread are whatever the pin needs — including inch tapers and legacy sizes gauged from your sample the same way as any replacement fastener, and matched with dowel pins or clevis pins in the same run.
A taper pin carries shear load and locates parts, so material choice trades strength, corrosion resistance, weight and cost. Alloy or C45 steel gives the highest shear strength for the money; 316L survives washdown and marine; titanium saves weight where it counts. Start from the job, then read the exact numbers:
| Material | Density | Why choose it for a taper pin |
|---|---|---|
| C45 / alloy steel 4140 | 7.85 g/cm³ | Highest shear strength and hardness for load-bearing pins |
| Stainless 304 | 7.9 g/cm³ | General corrosion resistance, outdoor and food |
| Stainless 316L | 8.0 g/cm³ | Marine, washdown and chemical environments |
| Brass C360 | 8.5 g/cm³ | Electrical, decorative, non-sparking |
| Aluminum 6061 | 2.70 g/cm³ | Light-duty locating where weight matters |
| Titanium Gr5 | 4.43 g/cm³ | ~45% lighter than steel with high strength |
Enter your pin's large-end and small-end diameters and length — the calculator reads the exact weight (from the true taper volume) and relative material cost of every option:
Classic reverse-engineering job: we gauge the large-end diameter, length and taper from your broken pin and turn new ones in alloy steel, hardened if the original was, with spares in the run.
Internally threaded DIN 7978 pins in 316L are a routine turning job — the tapped large end takes a puller so the pin comes out of a blind hole cleanly, and passivated 316L handles the washdown.
Fully bespoke pins are our default: give us the taper (or the mating hole), the large-end diameter and length, and we turn them to your print with matching reamer advice if you need it.
Matched pins & hardware: we machine dowel pins, pivot pins and clevis pins in the same material and run, so a repair or build arrives as one consistent, certified set.
Taper pins hold by friction and are driven out with a punch. Where the joint is meant to be opened by hand instead, see lock pins with a retaining chain.
A metric taper pin is 1:50; an imperial one is ¼ inch per foot, which is 1:48. A 1:48 pin in a hole reamed 1:50 seats on the large end only and works loose; the reverse binds at the small end. The nominal size is read at different ends too: DIN 1 and ISO 2339 name the pin by its small-end diameter, ANSI B18.8.2 by its large end, so a "6 mm" DIN pin and a "No. 3" ANSI pin are not the same part. Match the taper first, then the end the size is measured at.
A hole drilled through both and finished with a 1:50 taper reamer, and a pin whose length equals the hub width plus enough small-end protrusion to drive it out; an internally threaded DIN 7978 pin instead if the hole is blind and the pin must be pulled, not driven.
Stainless instead of C45, a DIN 7977 threaded stub for extraction, a longer or shorter length than the ISO 2339 steps, or an imperial 1:48 copied from a sample — each is a variant of the same drawing, one piece and up, quoted in 12 hours.
The standard 1:50 taper (1 mm of diameter per 50 mm of length), turned with strict angle control. Non-standard tapers like 1:48 are also possible — tell us the taper or send the pin.
Yes — a core job. Send the worn or broken pin; we gauge large-end diameter, length and taper and turn new ones, same or upgraded material, plus spares. No drawing or part number needed.
DIN 1 (ISO 2339) is plain; DIN 7978 (ISO 8736) has an internal thread for pulling out of a blind hole; DIN 7977 (ISO 8737) has an external thread and nut. We machine all three plus grooved variants.
C45 or alloy steel for shear strength; 304/316L for corrosion; brass for electrical; titanium to save weight. Use the calculator on this page to compare weight and relative cost for your pin size.
One piece. No tooling charge — a single stainless taper pin in an odd size is a normal order. Unit price falls on batches.
The large-end diameter and length, the taper if it is not 1:50, whether you need a plain, internally or externally threaded pin, the material or environment, and the quantity — or simply the old pin. A drawing helps but a dimensioned sketch or the sample is enough. Quote within 12 hours.
Large-end Ø, length, taper and material — or the worn pin. Engineers reply in 12h.
// Qty & price
1 pc
Sample price
Confirm fit before a run
10–50
Unit price drops
Setup cost shared
100+
Best price
All tiers quoted upfront
Non-standard, imperial, threaded or a worn original — turned to a 1:50 taper or matched to your pin. Quote in 12 hours.