| How to order... |
| In addition to American Standard Pipe Threads, we also manufacture tap chasers in Unified National (UN), Metric, Acme, British Pipe Tapered and British Pipe Straight. The threads on all of our tap chasers are CNC Thread Ground to provide the best product possible. It is critical that we know the material to be threaded in order to provide the proper radial or "circular" clearance. You will find our recommendations for circular clearances and cutting edge geometries in the chart below. The standard chamfer angle is 33° on regular style chasers and 45° on projection style. This chamfer angle may be changed to suit the job, since tool life will be greatly enhanced by lengthening the chamfer and spreading the cutting load over a larger area of the chaser. |
HOOK ANGLES AND CIRCULAR CLEARANCES |
| MATERIAL | HOOK ANGLE | CIRCULAR CLEARANCE |
|---|---|---|
| Aluminum Bronze | 10° Hook | LOW or LC |
| Aluminum, Cast | 20° Radial Hook | LOW or LC |
| Bakelite | 5° Snub | HIGH or HC |
| Brass, Bar | 5° Hook | HIGH or HC |
| Brass, Cast | 5° Hook | HIGH or HC |
| Brass, Forging | 10° Hook | HIGH or HC |
| Brass Tubing | 10° Hook | HIGH or HC |
| Bronze, Cast | 5° Hook | HIGH or HC |
| Copper | 20° Radial Hook | MEDIUM or MC |
| Iron, Cast | 5° Hook | HIGH or HC |
| Iron, Gray | 10° Hook | HIGH or HC |
| Iron, Malleable | 10° Hook | HIGH or HC |
| Monel Metal | 10° Hook | MEDIUM or MC |
| Iconel | 15° Hook | HIGH or HC |
| Plastic | 5° Hook | HIGH or HC |
| Stainless Steel... | ||
| - 300 series | 15° Radial Hook | MEDIUM or MC |
| - 400 series | 15° Radial Hook | MEDIUM or MC |
| Steel, Carbon | 10° Hook | MEDIUM or MC |
| Steel, Cast | 10° Hook | MEDIUM or MC |
| Steel, Forged | 15° Radial Hook | MEDIUM or MC |
| Steel, Leaded | 10° Hook | MEDIUM or MC |
| Steel Tubing | 15° Radial Hook | MEDIUM or MC |
| Steel, Tool | 15° Radial Hook | MEDIUM or MC |
| Teflon | 5° Hook | HIGH or HC |
| Titanium | 15° Hook | MEDIUM or MC |
| Zinc, Diecast | 20° Radial Hook | MEDIUM or MC |
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