These are our stainless steel common machinable grades we use at Dynamic Die & Steel. We may have other materials not listed here but this will give you a guide of our popular materials.
Incoloy Iron-Based Superalloys
- A-286
- Incoloy 800
- Incoloy 801
- Incoloy 825
- Incoloy 925
Nickel-Based Superalloys
- Inconel 600
- Inconel 601
- Inconel 617
- Inconel 625
- Inconel 690
- Inconel 693
- Inconel 718
- Inconel 722
- Inconel 725
- Inconel X-750
- Inconel 783
- Hastelloy C-22
- Hastelloy C-276
- Hastelloy X
- Hastelloy B-2
- Hastelloy B-3
- Hastelloy G-30
- Monel 400
- Monel K-500
- Nimonic 75
- Nimonic 80A
- Nimonic 90
- René 41
- René 80
- Waspaloy
- Haynes 188
- Haynes 230
- Haynes 242
- Haynes 263
- Haynes 556
Cobalt-Based Superalloys
- Stellite 6
- Stellite 21
- Stellite 31
- Haynes 25 (L-605)
- Haynes 188
- Mar-M 509
Austenitic
- 301
- 302
- 303
- 304
- 304L
- 304H
- 309
- 310
- 310S
- 316
- 316L
- 316H
- 317
- 317L
- 321
- 347
Ferritic
- 409
- 410S
- 430
- 434
- 436
Martensitic
- 403
- 410
- 414
- 416
- 420
- 420F
- 422
- 431
- 440A
- 440B
- 440C
Duplex / Super Duplex
- 2101
- 2205
- 2304
- 2507
- Zeron 100
Precipitation Hardening
- 13-8 PH
- 15-5 PH
- 17-4 PH
Special Grades
- 904L
- Nitronic 50
- Nitronic 60
Stainless Steel Common Machinable Grades
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A–Z CNC Machinable Materials
CNC (Computer Numerical Control) machining can process a vast array of materials, broadly categorised into metals, plastics, and sometimes composites or ceramics. The optimal material choice is always dictated by the final part’s required performance, environment, and budget.
- ABS (plastic)
- Acetal (POM / Delrin)
- Aluminium (all grades)
- Alloy Steels
- Acrylic (PMMA)
- Bakelite
- Basswood
- Brass (CZ121, CZ108, etc.)
- Bronze (phosphor, aluminium, manganese)
- Carbon Steel
- Carbon Fibre Sheet
- Cast Iron (grey, ductile)
- Copper (C101, C110)
- Delrin (Acetal / POM)
- Duplex Stainless Steel
- Epoxy Tooling Board
- Engineering Plastics (general)
- Fibreglass (G10 / FR4)
- Foam Board (modelmaking)
- Glass-Filled Nylon
- Graphite (electrodes, tooling)
- Hardened Tool Steel
- HDPE (High-Density Polyethylene)
- Inconel
- Impact-Resistant Polymers (general)
- Kovar
- Kevlar Composites
- Low-Carbon Steel
- Leaded Brass
- Magnesium
- Mild Steel
- Molybdenum
- Medical-Grade Plastics
- Nylon (PA6 / PA66 / PA12)
- Nitriding Steels
- O1 Tool Steel (and other oil-hardening steels)
- PE (Polyethylene)
- Polypropylene (PP)
- PTFE (Teflon)
- Quench & Tempered Steels
- Rigid PVC
- Stainless Steel (See second page for list )
- Superalloys ( see 2nd list I)
- Titanium (Grade 2, Grade 5)
- Tool Steels (D2, H13, O1, etc.)
- UHMWPE
- Urethane (machinable tooling board)
- Vespel
- Vinyl Plastics
- Wood (hardwoods & softwoods)
- Waspaloy
- Xylan-Coated Metals (secondary machining)
- Yellow Metals (general term for brass/bronze alloys)
Metals are the cornerstone of CNC, offering superior strength, durability, and conductivity.
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Aluminium Alloys (e.g., 6061, 7075): The most common choice. Aluminium is prized for its excellent machinability, high strength-to-weight ratio, and natural corrosion resistance, making it ideal for aerospace and automotive parts.
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Stainless Steel (e.g., 304, 316): Selected for its exceptional corrosion resistance, high strength, and aesthetic finish, particularly in medical and food processing applications. Certain grades, like 303, are specifically formulated for better machinability.
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Brass and Copper: Excellent for components requiring high electrical and thermal conductivity, such as electrical contacts and heat sinks. Brass is known for its outstanding machinability, often leading to reduced cycle times.
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Titanium Alloys (e.g., Ti-6Al-4V): Reserved for demanding, high-performance applications due to its incredible strength-to-weight ratio and biocompatibility, despite being more challenging and costly to machine.
Plastics are chosen for their light weight, electrical insulation, and chemical resistance.
Understanding the material’s machinability, strength, and cost is critical for successful CNC manufacturing.
Understanding the Machinability Index
The Machinability Index (or Machinability Rating) is a comparative measure of how easily a material can be cut. It is expressed as a percentage (%) relative to a standardised reference material. The Machinability Index is a vital tool for manufacturers to quickly estimate the production time and cost associated with machining a new part.
For any information on Stainless Steel Common Machinable Grades email us today.