VT machining offers CNC Tapping for Alloy 42 (UNS K94100 / ASTM F30 / 4J42), typically supplied annealed. Lower-cost Fe-Ni with expansion close to silicon and ceramics.
CNC Tapping Notes for Alloy 42
Alloy 42 is tapped with cut taps (spiral-point for through holes) and controlled rigid-tapping speed; thread milling is used where tap breakage would be costly.
For estimating, a 100 × 100 × 10 mm block of Alloy 42 weighs about 0.81 kg.
Starting Parameters for CNC Tapping Alloy 42
| Cutting speed (carbide) | 5-10 m/min |
|---|---|
| Recommended tap | Form (roll) tap — chipless |
| Tap drill for M8×1.25 | Ø7.4 mm (form tap) |
| Spindle speed, M8 | 200-400 rpm |
| Insert / tool class | ISO S — sharp PVD-coated carbide |
| Coolant | Flood emulsion; sulphurised oil for tapping |
Starting values for Alloy 42, Annealed; optimised on the first article.
Full material data for Alloy 42 (UNS K94100 / ASTM F30 / 4J42) is on the CNC Milling Alloy 42 page.
More on CNC Tapping Kovar
Finishing options, quality documentation and general cnc tapping guidance for all kovar grades are on our CNC Tapping Kovar page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Tapping Alloy 42
Send a STEP/IGES model or PDF drawing, confirm Alloy 42 and its condition (we usually see it supplied annealed), the quantity, critical tolerances and any finish or certificate requirements.
Alloy 42 in Other Processes
Related
Send the drawing, the Alloy 42 condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What tolerances can you hold for CNC Tapping Alloy 42?
Achievable tolerances for Alloy 42 machining depend on the alloy, geometry and feature size. Milling holds positional and dimensional tolerances to around ±0.01 mm, tighter with precision setups. Exact figures are confirmed against your drawing callouts.
Can VT machining make custom Alloy 42 parts to my drawing?
Yes. Alloy 42 machining is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
Which industries use CNC Tapping Alloy 42 parts?
CNC Tapping Alloy 42 parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Alloy 42 components are required.
What is CNC Tapping Alloy 42 and how is it done?
CNC Tapping Alloy 42 refers to rigid CNC tapping cuts internal threads in sync with spindle feed for precise, repeatable thread engagement. Applied to Alloy 42 — matched/low thermal expansion for sealing — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
How clean are the edges produced by CNC Tapping on Alloy 42?
Machined Alloy 42 edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What surface finish is achievable on Alloy 42 with CNC Tapping?
Surface finish on Alloy 42 is controlled to your specification; we confirm the achievable Ra against your callout.