Free-Cutting Steels Technical Catalogue
Technical specifications of free-cutting steels for CNC machining and high-volume mass production
Free-Cutting Steel Groups
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Leaded Free-Cutting Steels
Lead-alloyed free-cutting steels offer excellent chip breaking characteristics and high-speed machinability. Ideal for high-efficiency mass production on CNC automatic lathes.
Grades
11SMnPb30 (1.0718), 11SMnPb37 (1.0737), 36SMnPb14 (1.0765), 36SMnPb28 (1.0769)
Tolerance
h9, h10, h11
Size Range
Round 2-120mm, Hexagon 5-80mm, Square 5-70mm
Standards
EN ISO 683-4, EN 10277
Dimension & Tolerance Table
| Form | Size Range (mm) | Tolerance | Standard Length |
|---|---|---|---|
| Round | 2 - 120 mm | h9, h10, h11 | 3 m (min 2.5 m, max 6 m) |
| Hexagon | 5 - 80 mm | h9, h10, h11 | 3 m (min 2.5 m, max 6 m) |
| Square | 5 - 70 mm | h9, h10, h11 | 3 m (min 2.5 m, max 6 m) |
Key Features
- Excellent machinability (high-speed cutting)
- Clean and short chip formation
- Reduced tool wear
- Superior surface finish after machining
- Suitable for high-volume mass production
- Available in round, hexagon, and square profiles
- Tight tolerance (h9) production capability
- Compatible with automatic lathes and CNC machines
Applications
- CNC machined precision parts
- Bolts, nuts, and studs
- Pins, bushings, and dowels
- Precision shafts and axles
- Automotive fasteners and components
- Hydraulic fittings and connectors
- Valve bodies and components
- Mass production turned parts
Technical Notes
- 11SMnPb30 (1.0718) is the most commonly used leaded free-cutting steel grade.
- Lead additive acts as a chip breaker, increasing cutting speed.
- EN ISO 683-4 defines hot-rolled production requirements.
- EN 10277 specifies cold-drawn mechanical properties.
- h9 tolerance is for precision applications; h11 for general-purpose use.
- Standard length is 3 meters; custom lengths (2.5-6m) available on request.
- Due to lead content, lead-free alternatives should be preferred for RoHS-compliant applications.
Detailed Technical Information and Quotation
Contact our expert team for detailed technical documents, application recommendations, and custom size quotations regarding this product type.