Achieving strength grade 8.8 without heat treatment! Cost reduction and shortened construction time through the reduction of annealing processes and wire drawing cycles. *Development of screws under 6 millimeters is also underway.
"Yakiress" is a "non-heat-treated steel material" for screws that achieves high tensile strength and hardness without heat treatment processes such as quenching and tempering. Even for long products, the absence of heat treatment reduces warping and bending, and by omitting spheroidizing annealing before cold forging and reducing the number of wire drawing processes, it contributes to cost reduction and shorter lead times through process simplification. [Features] ■ No heat treatment process required ■ Strength classification of 8.8 during screw manufacturing ■ Compatible with products that include washers ■ Achieved 841 MPa and 268 HV in samples (M6.0 bolts) *Currently, we are also developing sizes below 6 mm. Please contact us if you are interested.
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【Mechanical Properties (for M6.0 Bolt Sample)】 Fiber Flow: Good forging flow line Microstructure: Ferrite and Pearlite Tensile Strength: 841 MPa Hardness: 268 HV 【Composition】 C: 0.30 Si: 0.02 Mn: 1.43 P: 0.008 S: 0.007 Cu: 0.01 Ni: 0.03 Cr: 0.09 *For more details, please refer to the PDF document or feel free to contact us.
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For more details, please refer to the PDF document or feel free to contact us.
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Kōmuro Seisakusho Co., Ltd. is a manufacturing and sales company specializing in tapping screws. We produce a wide variety of screws based on "JIS standard products," including the powerful anti-loosening screw "Motion Tight," which achieves stability against loosening and breakage, and the "Three Tight," which has a rice ball-shaped (triangular) body. We also offer various surface treatment processes. Please feel free to consult with us. By transforming it into a "smile" that is neither "+" nor "−," we add the joy of "discovery" and design the fun of "sharing the joy when finding small surprises" with others through our 【Smile Screw】. Would you like to take a look at the Screw Project? URL: https://screw-project.com/map/