Related Tooling: Threading Inserts for ACME and Trapezoidal Threads
ACME and Trapezoidal threads require single-point threading inserts β typically 16ER/16IR geometry for external/internal threads, or 22ER for larger pitches. Choosing the right threading insert grade depends on your workpiece material. For steel threading at Vc 80-150 m/min, use CVD-coated grades like Mitsubishi US7020, Sandvik GC4325, or Kennametal KC9325. For stainless ACME threading (304/316) at Vc 60-100 m/min, switch to PVD grades like Mitsubishi VP15TF, Sandvik GC2025, or Korloy NC3220. The threading insert must match the thread profile (e.g., ACME 1.0 pitch uses a 16ER AG60 profile; ACME 0.05 pitch uses 16ER AG60-NPT style).
Recommended Cutting Parameters for Threading Inserts
For ACME threading with single-point inserts, use these starting parameters then refine based on chip color and tool wear:
| Material | Grade Type | Vc (m/min) | Passes | Coolant |
|---|---|---|---|---|
| Low-carbon steel (1018) | CVD (US7020) | 100-150 | 6-10 | Flood or MQL |
| Alloy steel (4140) | CVD (GC4325) | 80-120 | 8-12 | Flood |
| Stainless 304 / 316 | PVD (VP15TF) | 60-100 | 10-14 | HP coolant 70 bar |
| Cast iron (class 30) | CVD (MP8015) | 90-130 | 6-8 | Dry preferred |
| Aluminum 6061 | Uncoated K10 | 200-400 | 4-6 | Flood or MQL |
For deeper parameter guidance on all materials, see our speeds & feeds hub. For operation-specific threading insert selection and chip breaker geometry, see our carbide inserts by operation guide. For material-based grade selection, see carbide inserts by material. For the full 8-brand threading grade matrix including Mitsubishi, Sandvik, Kennametal, Iscar, Walter, Korloy, Sumitomo, and Tungaloy equivalents, see our grade cross-reference hub.
Threading Insert Holders and Tool Selection
ACME and Trapezoidal threading requires a threading tool holder that matches your insert geometry (16ER = external right-hand, 16IR = internal right-hand). Choose holder shank size based on workpiece diameter and pitch size. For the complete threading tool holder family selection (external/internal, right-hand/left-hand, shank sizes, and coolant-through options), see our tool holder guide.
If you are machining ACME threads on stainless 304/316, use grade VP15TF at Vc 60-100 m/min. For a complete cross-reference of VP15TF equivalents across 8 brands, see our VP15TF equivalent guide. For internal coolant-through requirements on deep ACME threads, see carbide inserts by ISO code for threading insert family coverage.
Shop Threading Inserts
Mitsubishi 16ER VP15TF, Sandvik GC2025 threading inserts, and Korloy NC3220 equivalents in stock β 24h shipping worldwide.
Browse Threading Inserts βNeed help selecting the right threading insert grade for your ACME or Trapezoidal thread? Send us your workpiece material, thread pitch, and current grade on WhatsApp for a free 10-minute recommendation from our engineering team.
For more on chipbreaker geometry and tooling selection, see our carbide inserts by ISO code reference and the complete grade cross-reference hub for 8-brand equivalents across all ISO applications.
Browse threading inserts by brand:
- Mitsubishi threading inserts (US7020 steel + VP15TF stainless)
- Sandvik threading inserts (GC4325 steel + GC2025 stainless)
- Kennametal threading inserts (KC9325 steel + KC7315 stainless)
- Iscar threading inserts (IC8250 universal)
- Walter threading inserts (WSM01 steel + WPP05 stainless)
- Korloy threading inserts (NC3030 steel + NC3220 stainless)
- Sumitomo threading inserts (AC630M steel + AC6020M stainless)
- Tungaloy threading inserts (T9125 steel + T9115 stainless)