SK95M (SK4) - UNS T72301 | High Carbon Tool Steel

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MOQ : 100 Kilograms

About SK95M (SK4) - UNS T72301 | High Carbon Tool Steel

Property	Value
Grade	SK95M (SK4)
Reference Standards (for reference only)	JIS SK95M (G3311) / SK95 (G4802) AISI/SAE W1-9 UNS T72301
Available Shapes	Coil, Sheet
Manufacturable Thickness Range (Strip, Sheet)	0.10–2.0 mm
Manufacturable Width Range (Strip, Sheet)	3.0–300 mm
Length	Strip or Sheet (Length less than 2,000 mm)
Technique	Cold Rolled
Temper	Annealed, Skin Passed, As Rolled (Hard), Q&T
Surface Finish	Bright, Dull
Examples of Applications	Springs, Hinges, Bandsaws, Thomson Blades/Pinnacle Blades, Horns, Tape Measures, Metal Washers, Spacers
Coil I.D.	300, 400, 525 mm
Chemical Composition	Refer to the image
Mechanical Properties	Refer to the image
Density	7.84 g/cm³
Specific Heat	490 J/(kg·K)
Electrical Resistivity	18 μΩ·cm
Young's Modulus	208 GPa
Thermal Expansion	11.0 × 10^-6/K (0–100°C)
Thermal Conductivity	50.2 W/(m·K)
Melting Range	Refer to specification
Magnetism	Strong
Minimum Order Quantity	100 Kilograms
Country of Origin	Japan, China, Taiwan
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP, etc.
Packing	Our Standard Packing for Export
Export Markets	Asia, Middle East, North America, South America, Europe, etc.
Description	SK95M (formerly known as SK4) is a high-carbon tool steel containing approximately 0.95% carbon. It is one of the most widely used cold-rolled carbon steels due to its excellent balance of workability, hardenability, performance, and cost effectiveness. Compared with lower-carbon grades such as SK85, SK95M offers higher hardness potential and superior hardenability, making it suitable for applications requiring greater wear resistance, higher strength, and improved durability. Most SK-series carbon tool steels are heat treated either before or after forming to achieve the desired mechanical properties. SK95M responds exceptionally well to quenching and tempering, enabling manufacturers to obtain high hardness and excellent edge retention. TOKKIN maintains an optimized surface roughness condition that supports high-quality heat treatment results and enables an ideal final surface finish after blackening processes. Main Features: High Carbon Content Approximately 0.95% carbon provides excellent hardness, wear resistance, and edge retention after heat treatment. Superior Hardenability Higher hardenability than SK85 allows for use in demanding applications requiring increased durability and strength. Excellent Balance of Cost and Performance Provides an economical solution while maintaining excellent mechanical performance and reliability. Suitable for Heat Treatment Available in Annealed, Skin Passed, Hard Rolled, and Quenched & Tempered (Q&T) conditions. Excellent Wear Resistance High hardness after heat treatment supports long service life in cutting, spring, and precision mechanical applications. Optimized Surface Quality Controlled surface roughness enables improved appearance and performance after heat treatment and blackening. SK95M is widely used in springs, hinges, bandsaws, Thomson blades, precision cutting tools, tape measures, horns, metal washers, spacers, and other industrial components requiring high strength, wear resistance, and dimensional stability.