1117 Free-Machining Carbon Steel (UNS G11170)
Low-carbon steel with added sulfur and manganese for fast machining and a good carburized case — the screw-machine grade for case-hardened pins, gears and fittings.
What 1117 is.
1117 is a resulfurized low-carbon steel. Sulfur at 0.08 to 0.13 percent forms manganese sulfides that break chips, so it machines much faster than 1018, and the higher manganese improves the hardness of a carburized case. It is the classic screw-machine grade for parts that are turned in volume and then case hardened. Not for pressure-boundary, structural, fatigue-loaded or low-temperature bolting.
We run 1117 on the Swiss and CNC lathes for pins, fittings, bushings and small components, and carburize and harden to the drawing.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Carbon | C | 0.14 | 0.20 |
| Manganese | Mn | 1.00 | 1.30 |
| Phosphorus | P | — | 0.040 |
| Sulfur | S | 0.08 | 0.13 |
Per SAE J403 / ASTM A29, confirmed by ASTM A311 Table 1, Alro, Niagara LaSalle and AZoM.
Mechanical properties.
| Condition (¾–1¼ in. round) | Tensile strength, typical (ksi) | Yield strength 0.2% offset, typical (ksi) | Elongation, typical (%) | Reduction of area, typical (%) | Hardness, typical |
|---|---|---|---|---|---|
| Cold drawn | 69 | 58 | 15 | 40 | 137 HB |
Typical values for cold-drawn bar, confirmed by Niagara LaSalle and AZoM (Alro’s 1-in. mill average is 69 / 58 ksi). ASTM A108 sets no mechanical requirements, so order to a stated minimum where one matters.
Specifications that apply.
How 1117 ships from Houston.
- Machined components from certified bar
- Pins, shafts and bushings
- Case-hardened wear parts
- Washers and spacers
1117 fasteners we make.
Every item is manufactured to your drawing or standard in 1117, imperial or metric, with an EN 10204 3.1 certificate.
What is 1117 steel?
1117 is 1018's free-machining cousin. Sulfur forms soft inclusions that act as chip breakers and internal lubricant, cutting cycle time and improving finish, while the higher manganese gives the steel a deeper, harder carburized case than 1018. It is not a welding grade, and like other free-machining steels it is notch sensitive with low impact strength at low temperature, so it is used for machined parts in volume rather than structural or fatigue-critical work.
Testing, certification and marking
- Hardness tested per lot; tensile on request or where the specification requires it
- Manufacturer's identification and heat number on every piece where size allows
- EN 10204 3.1 material test report with heat number and chemistry
- PMI verification on request
1018 Carbon Steel (UNS G10180)
The everyday machining steel: low carbon, easily welded and case hardened, cold drawn for a clean finish — for pins, spacers, brackets and non-critical machined parts.
ASTM A108 / A29 / A311 bar1144 Free-Machining Carbon Steel (UNS G11440)
Medium-carbon free-machining steel that is strong straight from the bar: about 108 ksi cold drawn, machines well, hardens by induction — the Stressproof® family grade for shafts and studs without heat treatment.
ASTM A108 / A29 bar12L14 Leaded Free-Machining Steel (UNS G12144)
The fastest-machining steel there is: lead, sulfur and phosphorus give short chips and a bright finish at high speed — for high-volume screw-machine fittings, pins and adapters in light duty.