M2.5–M16 Black Grade 12.9 Steel Hex Socket Allen Spring Ball Plunger Set Screw Grub Bolt

M2.5–M16 Black Grade 12.9 Steel Hex Socket Allen Spring Ball Plunger Set Screw Grub Bolt

Black grade 12.9 steel spring ball plunger set screws for high-strength detent positioning and indexing applications. The spring-loaded ball tip provides positive, repeatable detent action. Grade 12.9 delivers maximum tensile strength for heavy-duty industrial positioning mechanisms where stainless steel would be insufficient.

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Key Specifications

Material	Alloy Steel
Grade	12.9
Finish	Black oxide
Drive	Hex socket (Allen key)
Tip Type	Spring ball plunger
Thread Range	M2.5, M3, M4, M5, M6, M8, M10, M12, M16

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Why Choose Grade 12.9 Spring Ball Plunger Set Screws?

• Grade 12.9 strength — 1220 MPa tensile strength; handles heavy-duty detent loads that would strip lower-grade set screws
• Spring ball plunger — positive detent action for indexing and positioning without tools
• Black oxide finish — professional appearance; light corrosion resistance for indoor use
• M2.5–M16 range — covers light electronics to heavy industrial positioning

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Typical Applications

• Heavy-duty rotary table and turret indexing
• CNC machine tool holder detent retention
• Industrial jig and fixture positioning
• Drawer and cabinet latch mechanisms (high-cycle)
• Precision instrument detent positioning

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Package Contents

• Black grade 12.9 steel spring ball plunger set screws (quantity and size per selected variant)

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