Parallel Pin, Internal Thread, Metric Sizes
What Is an Internally Threaded Parallel Pin?
An internally threaded parallel pin is a precision ground dowel pin with a straight, uncambered shank and an internal thread machined into one end. Like a standard dowel pin, it's installed with a press or slip fit in a reamed hole to locate and align mating parts. The added internal thread lets you thread in a pulling bolt or a slide hammer adapter to extract the pin in a controlled way.
This is especially useful in blind hole applications, where the far end of the pin isn't accessible to knock it back out, or where a stepped or shouldered pin needs to be removed without damaging the surrounding bore.
Key Features and Benefits
- Internal Thread for Extraction: allows a pulling bolt or slide hammer adapter to be threaded in.
- Ideal for Blind Holes: removable even when the far end of the pin can't be reached or struck.
- Precision Ground Shank: sized for a controlled press or slip fit like a standard dowel pin.
- Damage Free Removal: avoids drilling or punching out a stuck pin.
- Reliable Locating and Alignment: maintains repeatable positioning between mating parts.
Materials and Finishes
- Hardened Steel: ground and heat treated for wear resistance and dimensional stability.
- Ground Finish: precision ground to a tight diameter tolerance.
Standards Compliance
- DIN 7979 D, Parallel pins with internal thread
- ISO 8735, Parallel pins with internal thread, for the use of a pulling device
Size Range and Availability
Available in a full metric size range, sold individually or in bulk quantities.
Related Categories and Products
Frequently Asked Questions (FAQs)
1. What is an internally threaded parallel pin used for?
It's used like a standard dowel pin to locate and align mating parts, with the added benefit of an internal thread that allows the pin to be pulled back out with a bolt or slide hammer.
2. Why would I choose this over a standard dowel pin?
Choose the internally threaded version when the pin will be installed in a blind hole or another location where the far end can't be reached or struck to drive the pin back out.
3. How do you remove an internally threaded parallel pin?
A bolt or slide hammer adapter is threaded into the internal thread, then used to pull the pin straight back out of the hole.
4. Does this pin fit the same hole as a standard dowel pin?
Yes, it has the same straight, parallel shank and fits the same reamed hole as a standard dowel pin; only the threaded end differs.
5. Is this pin as precise a locating fit as a standard dowel pin?
Yes, the shank is ground to the same precision tolerance as a standard dowel pin for a controlled press or slip fit.
6. What sizes are available?
We stock a full metric size range, available individually or in bulk quantities.
