The JIS 7388/2/B-1983 Pull Stud (Special Size) is a precision-engineered retention stud designed according to Japanese Industrial Standard (JIS 7388 Type B). This pull stud is used in SK series tool holders and ensures secure clamping between the CNC machine spindle and the tool holder.
As shown in the technical drawing, this pull stud is manufactured with exact dimensional accuracy, specific chamfer angles, and precise thread geometry to meet demanding CNC machining requirements. Pull studs are a critical safety component—any dimensional deviation or low material quality can lead to poor clamping force, vibration, tool pull-out, or machine damage.
This special size JIS 7388/2/B pull stud is made from high-strength special alloy steel and is properly heat-treated to achieve superior rigidity, wear resistance, and long service life. It is suitable for high-speed machining and heavy cutting conditions where reliability is essential.
Key Features
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Manufactured as per JIS 7388/2/B-1983 standard
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Special size as per technical drawing
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Designed for SK tool holder systems
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Precision-machined critical dimensions and angles
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High rigidity for stable and vibration-free machining
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Heat-treated for enhanced strength and wear resistance
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Ensures safe, secure, and reliable tool clamping
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Suitable for high-speed CNC machining applications
Technical Highlights (As Per Drawing)
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Standard: JIS 7388 / Type B
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Version: 2 / B – 1983
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Type: Pull Stud / Retention Knob
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Application: CNC Machines
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Tool Holder Compatibility: SK Type
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Material: Special Alloy Steel
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Heat Treatment: Yes
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Design: Special size with precision chamfers & threads
Why Use Genuine JIS 7388 Pull Studs?
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Reduce spindle clamping force
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Cause vibration and poor surface finish
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Lead to sudden pull stud failure
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Damage spindle, tool holder, and workpiece
Using a correct JIS-standard pull stud ensures machine safety, accuracy, and long tool life.
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