JIS Standard M2 Steel Precision Straight Ejector Sleeves

This precision straight ejector sleeve is used inside injection mold ejector systems where straight guiding is critical for stable part release and consistent ejection force transmission. The single-sleeve layout supports straight-line motion during high-cycle mold operation, helping maintain alignment between the ejector pin and the surrounding components.

In automotive connector and sensor housing molds, the wire-cut and polished bore finish helps achieve smooth sliding under repeated start/stop conditions, reducing stick-slip and promoting uniform ejection across multiple cavities.

For consumer electronics and slim enclosure parts, the sleeve’s tight inner diameter tolerance options (e.g., 0/-0.005 to -0.01/-0.02 style selections) are suited to designs that demand controlled clearance and concentricity at small shaft diameters (3.2–14 mm).

• Choose the variant matching your required head thickness (4 mm, 6 mm, or 8 mm) for reliable seating and load transfer.
• Select V (hole diameter) and L (length) from the available ranges to match your ejector pin guide geometry.

This component is specified as JIS Standard M2 steel for precision wear resistance in ejector guide applications. In practical terms, M2 is commonly associated with the high-speed steel family used for tooling components requiring good hardness and abrasion resistance.

Because the bore is produced by wire cutting & polishing, the steel’s ability to hold a tight geometry after heat treatment is important for long-term dimensional stability and smooth sliding.

• Hardness: For M2 (HSS), typical heat-treated hardness is often around the mid-to-high HRC range depending on supplier process, balancing wear resistance and toughness.
• Trade-off: Higher hardness improves wear resistance but can reduce toughness if used beyond recommended tempering practice.
• Heat treatment state: Usually provided in a precision-machined, heat-treated condition (commonly quenched and tempered) suitable for fine-bore guiding.

Start by matching the sleeve to the ejector pin shaft size. The available shaft diameter (D/P) range is 3.2 to 14 mm, and the sleeve supports 0.01 mm increments for shaft diameter selection.

Select the hole diameter (V) from 0.8 to 2 mm and confirm the tolerance style you require: available shaft diameter tolerance selections include 0/-0.005 and -0.01/-0.02 style options (use the tighter selection when you need controlled clearance).

Then choose length L from 40–225 mm or 40–250 mm depending on configuration, and verify the S (V hole diameter length) is 1 mm (fixed in the provided specification set).

• Match head thickness to your tooling: options are T4 = 4 mm, and JIS head thickness of 6 mm or 8 mm.
• Use the tolerance selection to manage running clearance and ensure smooth ejection without binding.