| Category |
Standard |
JIS Designation |
ASTM/UNS |
Key Chemistry |
Core Characteristics |
Primary Applications |
| Stainless Steel (Austenitic Free Machining) |
JIS G4318 / ASTM A276 |
SUS303 |
S30300 |
Cr:17-19%, Ni:8-10%, S:0.15% min |
Excellent machinability and good general corrosion resistance; sulfur improves machinability but reduces corrosion resistance and weldability |
Precision turned parts, bushings, fittings, general hardware |
| Stainless Steel (Austenitic Free Machining) |
JIS G4318 / ASTM A276 |
SUS303Cu |
S30330 |
Cr:17-19%, Ni:8-10%, Cu:1.5-3.5%, S:0.15% min |
Copper-added free-machining stainless steel with good machinability and corrosion resistance |
Complex turned parts, fittings, instrumentation components, general precision parts |
| Stainless Steel (Austenitic Free Machining) |
JIS G4318 / ASTM A276 |
SUS316F |
S31620 |
Cr:16-18%, Ni:10-14%, Mo:2-3%, S:0.10% min |
Free-machining 316 stainless steel with strong corrosion resistance; sulfur improves machinability |
Marine components, chemical equipment, pump and valve components, precision turned parts |
| Stainless Steel (Austenitic) |
JIS G4303 / ASTM A276 |
SUS316L |
S31603 |
Cr:16-18%, Ni:10-14%, Mo:2-3%, C≤0.030%, S≤0.030% |
Low-carbon 316 stainless steel with excellent corrosion resistance and weldability |
Chemical equipment, food-processing equipment, medical and general corrosion-resistant components |
| Stainless Steel (Martensitic Free Machining) |
JIS G4318 / ASTM A276 |
SUS416 |
S41600 |
Cr:12-14%, C≤0.15%, S≥0.15% |
Free-machining martensitic stainless steel; heat treatable with moderate corrosion resistance |
Shafts, gears, valve components, fasteners, machined mechanical parts |
| Stainless Steel (Martensitic Free Machining) |
JIS G4318 / ASTM A276 |
SUS420F |
S42020 |
Cr:12-14%, C:0.26-0.40%, S≥0.15% |
Heat-treatable free-machining martensitic stainless steel with good wear resistance |
Valve components, shafts, wear parts, tooling and precision turned components |
| Stainless Steel (Ferritic Free Machining) |
JIS G4318 / ASTM A276 |
SUS430F |
S43020 |
Cr:16-18%, C≤0.12%, S≥0.15% |
Free-machining ferritic stainless steel with good atmospheric corrosion resistance and magnetic properties |
Electrical components, appliance hardware, fittings and general turned parts |
| Free-Cutting Carbon Steel |
JIS G4804 / ASTM A108 |
SUM24L |
12L14 / UNS G12144 |
C≤0.15%, Mn:0.85-1.15%, P:0.04-0.09%, S:0.26-0.35%, Pb:0.15-0.35%, Si≤0.10% |
Excellent machinability due to sulfur and lead; not intended for welding or severe corrosion service |
High-volume turned parts, bushings, fittings, shafts, fasteners and automatic-lathe components |
| Medium-Carbon Steel |
JIS G4051 / ASTM A108 |
S45C |
AISI/SAE 1045 / UNS G10450 |
C:0.42-0.48%, Mn:0.60-0.90%, Si:0.15-0.35% |
Medium-carbon steel with good strength, machinability and heat-treatment response |
Shafts, gears, pins, rollers, mechanical components and general machine parts |
| Free-Cutting Brass |
JIS H3250 / ASTM B16 |
C3604 |
C36000 |
Cu:60-63%, Pb:2.5-3.7%, Fe≤0.35%, Zn:balance |
Excellent free-machining brass for high-speed screw machining and precision turning |
Fittings, valves, connectors, bushings, screws and precision turned parts |
| Forging Brass |
JIS H3250 / ASTM B124/B124M |
C3771 |
C37700 |
Cu:58-62%, Pb:1.5-2.5%, Zn:balance |
Good hot-forging capability with good machinability and moderate corrosion resistance |
Valves, fittings, forged connectors and machined brass components |
| Naval Brass |
JIS H3250 / ASTM B21/B21M |
C4641 |
C46400 |
Cu:59-62%, Sn:0.5-1.0%, Zn:balance |
Good seawater corrosion resistance and strength; not a typical free-machining leaded brass |
Marine hardware, valves, pumps, fittings and corrosion-resistant components |
| Lead-Free Free-Machining Brass |
JIS H3250 |
C6801 |
C68000 |
Cu/Zn-based lead-free alloy; exact limits per applicable JIS specification |
Lead-free brass designed for improved machinability; performance depends on grade and temper |
Plumbing components, fittings, electrical parts and precision turned components |
| Lead-Free Free-Machining Brass |
JIS H3250 / ASTM B371/B371M |
C6932 |
C69300 |
Cu/Zn/Si-based alloy; exact limits per applicable JIS specification |
Lead-free silicon brass with good machinability and corrosion resistance |
Plumbing fittings, valves, connectors and environmentally controlled applications |
| Lead-Free Free-Machining Brass |
JIS H3250 |
C6930 |
— |
Original cross-reference requires supplier/MTC verification |
Do not treat the original C6930 entry as a confirmed JIS-to-UNS equivalence without material certification |
Use only after exact grade and applicable standard are verified |
| Lead-Free Free-Machining Brass |
JIS H3250 |
C6811 |
C68100 |
Cu/Zn/Si-based alloy; exact limits per applicable JIS specification |
Lead-free brass intended for machinability and corrosion-resistant applications |
Fittings, connectors, electrical components and precision turned parts |
| Aluminum Alloy |
JIS H4040 / ASTM B211 or B221, product-form dependent |
A6061 |
6061 / UNS A96061 |
Mg:0.8-1.2%, Si:0.4-0.8%, Cu:0.15-0.40%, Cr:0.04-0.35% |
Heat-treatable aluminum alloy with good machinability, corrosion resistance and strength |
Brackets, housings, shafts, fixtures, structural and general engineering components |
| Aluminum Alloy |
JIS H4040 / ASTM B211, product-form dependent |
A2011 |
2011 / UNS A92011 |
Cu:5.0-6.0%, Bi:0.2-0.6%, Pb:0.2-0.6%, other limits per applicable specification |
High-machinability aluminum alloy; better suited to machining than welding |
High-speed turned parts, fittings, bushings, screws and precision components |
| Aluminum Alloy |
JIS H4040 / ASTM B211, product-form dependent |
A5056 |
5056 / UNS A95056 |
Mg:4.5-5.6%, Cr:0.05-0.20%, Mn:0.05-0.20%, Al:balance |
Non-heat-treatable Al-Mg alloy with good corrosion resistance and machinability |
Marine components, fittings, fasteners and general corrosion-resistant parts |
| Aluminum Alloy |
JIS H4040 / ASTM B211, product-form dependent |
A6262 |
6262 / UNS A96262 |
Mg:0.8-1.2%, Si:0.4-0.8%, Cu:0.15-0.4%, Pb/Bi added for machinability; exact limits per specification |
Heat-treatable free-machining aluminum alloy with good corrosion resistance and machinability |
Precision turned components, fittings, connectors, automotive and general engineering parts |
