O1 Tool Steel Positioning Locking Blocks with Angular Pin Hole ABPX

This positioning locking block is used in injection mold assemblies where repeatable shut-off alignment and stable undercut access are critical. The controlled locking angle (10–20°) helps ensure the locating surfaces engage consistently, reducing variation between production cycles.

• Automotive connector and housing molds: Mount the block to index moving components that require tight positional repeatability; the narrow-body geometry supports secure installation without excessive envelope space.
• Consumer electronics insert/undercut molds: Use the angular pin hole to achieve positive alignment, improving repeatability for cores/plates that cycle frequently.
• Multi-cavity molds with PL bolt mounting: Fix the block using the PL bolt approach to maintain consistent locking contact and support high-tolerance positioning requirements.

O1 tool steel selection is suited for dimensional stability and wear resistance in these cyclic alignment tasks, while the angular pin hole supports reliable alignment control.

The block is made from O1 tool steel, commonly selected for tooling components that need dimensional stability and good wear resistance during repeated indexing and clamping. In practical mold builds, O1 is typically quenched and tempered to balance hardness and toughness.

• Hardness: Depending on the final tempering condition, expect a typical hardened state used for wear surfaces (commonly in the ~HRC range around the mid-to-high 50s for tooling applications). Final hardness should be verified by the supplier’s heat treatment record.
• Wear vs. toughness trade-off: Higher tempering hardness improves resistance to fretting and indentation at the locking interface, while lower tempering temperatures can reduce toughness and increase risk of chipping.
• Manufacturing: Ground/finished critical locating faces and a precision angular pin hole are used to maintain the specified locking behavior and toleranced positioning.

Compared with higher-alloy wear grades, O1 offers a strong balance for alignment/locking blocks where both wear resistance and controlled machinability are beneficial.

Select the block dimensions by matching the locating and clearance requirements of the mold’s undercuts-plate positioning system. The block height T is available in 10 mm and 25 mm, so choose based on required stack-up thickness and available machining depth in the mounting plate.

• Length L: Choose 40 mm, 50 mm, or 55 mm to match the available locking zone and ensure adequate bearing length.
• Width A/W: Select from 15–55 mm to fit the envelope constraints of the undercuts-plates assembly while maintaining proper contact area.
• Angular hole diameter D: Use 6, 8, 10, or 13 mm to correspond with the angular pin specification used for positive locking.

The fixed locking angle A = 10–20° is already built into the design, so you mainly control compatibility via hole diameter and mounting geometry. Confirm fit by checking the hole/pin tolerance class and the PL bolt seating surfaces; small deviations can affect locking repeatability.