Steel SPCC 1/8H
Supply condition
JIS SPCC
1/8H = sPCC-8, one-eighth hard
Slight stiffness increase with most formability retained; used for flat panels that must resist oil-canning.
Values for the 1/8H condition
Other SPCC tempers and conditions
SPCC is listed in 7 conditions; see the grade overview at SPCC.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SPCC-A, fully soft (dead soft) cold rolled sheet | Pick for the deepest draws and most severe bending, where a slightly rougher surface and risk of stretcher strain are acceptable. | 175 | 295 | 42 | 90 HB | 11.5 % IACS |
Cold rolled | Default stocking condition: annealed and skin-passed cold-rolled coil/sheet for general stamping, brackets and enclosures. | 195 | 310 | 38 | 100 HB | 11 % IACS |
HRDefault Hot rolled | Use for thicker, less critical parts where cold-rolled surface and tight tolerances are not needed; SPCC itself is a cold-rolled grade, so this is the SPHC/hot-rolled analogue. | 220 | 320 | 33 | 110 HB | 11 % IACS |
1/8HThis page SPCC-8, one-eighth hard | Slight stiffness increase with most formability retained; used for flat panels that must resist oil-canning. | 260 | 350 | 26 | 108 HB | 11 % IACS |
Quarter hard | Choose when moderate springiness and higher yield are needed with simple bends only. | 330 | 420 | 16 | 130 HB | 10.5 % IACS |
Half hard | Stiff sheet for flat springs, clips and roll-formed sections; bending only along limited radii and preferably across the rolling direction. | 430 | 500 | 8 | 155 HB | 10 % IACS |
SPCC-1, full hard (as cold rolled, not annealed) | Maximum strength and flatness, essentially no formability — used for flat parts, shims, slit strip and substrate for further processing. | 550 | 600 | 3 | 11 HRC | 10.5 % IACS |
What is SPCC 1/8H?
SPCC 1/8H is SPCC supplied in the 1/8H condition — slight stiffness increase with most formability retained; used for flat panels that must resist oil-canning. SPCC 1/8H has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 92% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi). SPCC 1/8H has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F). HR is the default condition FabDigit quotes; 1/8H is available on request or by drawing note.
Advantages
- High electrical conductivity — 11 % IACS, better than 98% of steel grades
- Readily welded — 92/100, better than 93% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Forms and bends easily — 75/100, better than 90% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
Limitations
- Hard to polish — 30/100, worse than 100% of steel grades
- Low strength — 260 MPa (37.7 ksi), worse than 92% of steel grades
- Limited service temperature — 300°C (572 °F), worse than 78% of steel grades
SPCC 1/8H properties
Typical room-temperature values for SPCC 1/8H; 22 are specific to this condition. Other listed values are SPCC reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
SPCC 1/8H has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,495°C (2,723 °F).
Mechanical16
SPCC 1/8H has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 92% of steel grades. Elongation at break is 26% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
SPCC 1/8H is rated for continuous service to 300°C (572 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
SPCC 1/8H conducts electricity at 11 % IACS, better than 98% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of SPCC 1/8H takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 25%.
Manufacturability7
SPCC 1/8H's machinability is good (62/100, better than 89% of steel grades); weldability excellent (92/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SPCC 1/8H
Is SPCC easy to machine?
Soft and gummy — use sharp positive-rake tools, high speed and coolant; expect heavy burrs on punched/drilled sheet, plan deburring.
Can SPCC be welded?
Excellent for resistance spot, MIG/MAG and laser welding with ER70S-6 class wire; no preheat needed, but remove zinc/tin coating and ventilate fumes on coated variants.
Can SPCC be formed, bent or molded?
Standard temper draws, bends and roll-forms readily (bend radius ~0.5–1×t for SD/A temper); use SPCCD/SPCCE for severe draws and watch stretcher strain in non-skin-passed sheet.
What surface finishes work on SPCC?
Bare SPCC must be protected: zinc phosphate + e-coat/powder paint, electro- or hot-dip zinc, tin, or Ni/Cr plating; oiled surface must be degreased before painting.
SPCC chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| CJIS G3141 SPCC ladle analysis max | ≤ 0.15 | 0.06 |
| Mn | ≤ 0.6 | 0.3 |
| P | ≤ 0.1 | 0.02 |
| S | ≤ 0.05 | 0.02 |
| Altypical Al-killed deoxidation practice, not a JIS requirement | 0.02 – 0.07 | 0.04 |
| Fe | balance | — |
SPCC 1/8H — frequently asked
What is SPCC 1/8H used for?
SPCC 1/8H is typically used for sheet metal enclosures, PC and server chassis, appliance panels and covers, brackets and mounting plates, electrical cabinet doors and tinplate containers. In short: common commercial cold-rolled.
What is the yield strength of SPCC 1/8H?
SPCC 1/8H has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 92% of steel grades. Strength varies by condition: see the 7 listed tempers.
Is SPCC 1/8H easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Soft and gummy — use sharp positive-rake tools, high speed and coolant; expect heavy burrs on punched/drilled sheet, plan deburring.
Can SPCC 1/8H be welded?
Yes — weldability is rated excellent (92/100). Excellent for resistance spot, MIG/MAG and laser welding with ER70S-6 class wire; no preheat needed, but remove zinc/tin coating and ventilate fumes on coated variants.
What surface finishes work on SPCC 1/8H?
Bare SPCC must be protected: zinc phosphate + e-coat/powder paint, electro- or hot-dip zinc, tin, or Ni/Cr plating; oiled surface must be degreased before painting.
Can SPCC 1/8H be formed, bent or molded?
Standard temper draws, bends and roll-forms readily (bend radius ~0.5–1×t for SD/A temper); use SPCCD/SPCCE for severe draws and watch stretcher strain in non-skin-passed sheet.
What is the maximum service temperature of SPCC 1/8H?
SPCC 1/8H is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between SPCC-HR and SPCC-CR?
HR is the default condition — use for thicker, less critical parts where cold-rolled surface and tight tolerances are not needed; SPCC itself is a cold-rolled grade, so this is the SPHC/hot-rolled analogue. CR: default stocking condition: annealed and skin-passed cold-rolled coil/sheet for general stamping, brackets and enclosures. Yield strength is 220 MPa in HR versus 195 MPa in CR.
Can FabDigit make parts in SPCC 1/8H?
Yes — SPCC 1/8H is available for sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- JIS G3141 — Cold-reduced carbon steel sheets and strip — JSA (2021)
- JIS G3302 — Hot-dip zinc-coated steel sheets and coils (SGCC) — JSA (2019)
- JIS G3303 — Tinplate and blackplate (SPTE) — JSA (2017)
- GB/T 5213 / GB/T 708 — SAC (2019)
- ASM Handbook Vol.1: Properties and Selection — Irons, Steels — ASM International (1990)
- Machinery's Handbook, 31st ed. (machinability ratings) — Industrial Press (2020)
- Cold-rolled coil datasheets (Nippon Steel / JFE / Baosteel SPCC) — mill datasheets (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.