Steel 1108
AISI/SAE 1108 · UNS G11080
1108 (UNS G11080) is a low-carbon resulfurized free-machining steel with a modest sulfur addition (0.08-0.13 % S) that forms manganese sulfide inclusions for chip breaking in light-duty screw-machine work.
Reference datasheet — 1108 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the CD condition
1108 tempers and conditions
1108 is supplied in 6 conditions, soft to hard. CD is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Softest condition; used before heavy cold heading, deep bending or as a pre-carburizing state. | 180 | 325 | 33 | 90 HB | 10.8 % IACS |
Hot rolled | Lowest-cost form for parts that will be fully machined or subsequently cold worked/carburized. | 190 | 340 | 30 | 95 HB | — |
Normalized | Uniform fine grain and predictable machining response after hot forging. | 215 | 360 | 30 | 100 HB | 10.5 % IACS |
Cold Drawn, Stress Relieved | Pick when machining removes material asymmetrically and residual-stress distortion must be minimised. | 300 | 370 | 22 | 105 HB | 10.5 % IACS |
CDDefault Cold drawn | Standard screw-machine stock: close size tolerance, bright finish, higher strength and the best chip control. | 330 | 385 | 20 | 111 HB | — |
Carburized, Quenched & Tempered | Use when a wear-resistant 58–62 HRC case over a tough low-carbon core is needed on a machined part. | 415 | 620 | 15 | 60 HRC | — |
What is 1108?
1108 (UNS G11080) is a low-carbon resulfurized free-machining steel with a modest sulfur addition (0.08-0.13 % S) that forms manganese sulfide inclusions for chip breaking in light-duty screw-machine work. It is supplied as hot-rolled, cold-drawn, cold-drawn stress-relieved, annealed and normalized bar, and can be carburized and quench-tempered; cold-drawn stock runs about 330 MPa yield, 385 MPa tensile, 20 % elongation and 111 HB. Strength is low, welding is restricted by hot-cracking risk and there is no corrosion resistance bare. For higher machinability choose 1215; for a stronger carburizing free-machining grade choose 1118. 1108 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F). 1108 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 385 MPa (55.8 ksi) — weaker than 78% of steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
What is 1108 used for?
- Small fasteners
- screw machine parts
- light shafts
- pins
Advantages
- Easy to machine — 78/100, better than 97% of steel grades
- Conducts heat well — 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades
- Low embodied carbon — 1.9 kg CO₂/kg, better than 92% of steel grades
- High electrical conductivity — 10.5 % IACS, better than 89% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
- Low strength — 330 MPa (47.9 ksi), worse than 78% of steel grades
1108 properties
Typical room-temperature values for 1108-CD; bars are the position among steel grades.
Physical3
1108 has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,425°C (2,597 °F).
Mechanical14
1108 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 385 MPa (55.8 ksi) — weaker than 78% of steel grades. Elongation at break is 20% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1108 is rated for continuous service to 400°C (752 °F). It conducts heat at 51 W/m·K (29.5 BTU/hr·ft·°F), better than 92% of steel grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
1108 conducts electricity at 10.5 % IACS, better than 89% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (8/100), worse than 99% of steel grades.
Sustainability4
Producing a kilogram of 1108 takes about 25 MJ of energy and emits 1.9 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability8
1108's machinability is very good (78/100, better than 97% of steel grades); weldability fair (50/100); formability fair (50/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. 1108 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1108
Is 1108 easy to machine?
Excellent high-speed screw-machine steel — MnS gives short chips and good tool life; ~80 % of 1212, but keep speeds high to avoid a gummy built-up edge at low carbon.
Can 1108 be welded?
Weldable by resistance and short-arc processes with low heat input, but the 0.08–0.13 % S promotes hot/solidification cracking and porosity — avoid structural welding or use low-hydrogen filler and preheat.
Can 1108 be formed, bent or molded?
Good cold heading and bending in the longitudinal direction; sulfide stringers cause splitting in tight transverse bends, so anneal and use generous bend radii.
1108 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 |
|---|---|---|
| C | 0.08 – 0.13 | 0.1 |
| Mn | 0.5 – 0.8 | 0.65 |
| P | ≤ 0.04 | 0.02 |
| Sresulfurized for machinability | 0.08 – 0.13 | 0.1 |
| Fe | balance |
What surface finishes work on 1108?
No corrosion resistance bare — specify oil, phosphate, black oxide, zinc or nickel plating; sulfide inclusions can leave pinholes in bright plating and streaks in polished surfaces.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel 1108 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- G11080
How much does 1108 cost?
1108 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1108 — frequently asked
What is 1108 used for?
1108 is typically used for small fasteners, screw machine parts, light shafts and pins. In short: light-duty free-machining steel; about 80 % of 1212; low-carbon screw-machine grade.
What is the yield strength of 1108?
1108 has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 385 MPa (55.8 ksi) — weaker than 78% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1108 easy to machine?
Yes — machinability is rated very good (78/100, better than 97% of steel grades). Excellent high-speed screw-machine steel — MnS gives short chips and good tool life; ~80 % of 1212, but keep speeds high to avoid a gummy built-up edge at low carbon.
Can 1108 be welded?
With care — weldability is rated fair (50/100). Weldable by resistance and short-arc processes with low heat input, but the 0.08–0.13 % S promotes hot/solidification cracking and porosity — avoid structural welding or use low-hydrogen filler and preheat.
What surface finishes work on 1108?
No corrosion resistance bare — specify oil, phosphate, black oxide, zinc or nickel plating; sulfide inclusions can leave pinholes in bright plating and streaks in polished surfaces.
Can 1108 be formed, bent or molded?
Good cold heading and bending in the longitudinal direction; sulfide stringers cause splitting in tight transverse bends, so anneal and use generous bend radii.
What is the maximum service temperature of 1108?
1108 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1108-CD and 1108-A?
CD is the default condition — standard screw-machine stock: close size tolerance, bright finish, higher strength and the best chip control. A: softest condition; used before heavy cold heading, deep bending or as a pre-carburizing state. Yield strength is 330 MPa in CD versus 180 MPa in A.
How much does 1108 cost?
1108 is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- SAE J403 — Chemical Compositions of SAE Carbon Steels — SAE International (2014)
- ASTM A29/A29M — Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements — ASTM (2020)
- ASTM A108 — Steel Bar, Carbon and Alloy, Cold-Finished — ASTM (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- SAE J1397 — Estimated Mechanical Properties and Machinability of Steel Bars — SAE International (2009)
- GB/T 8731 (comparable Y08/Y12 grades) (2008)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.