Pin Gate Extension Bushings M2/P21 Steel

Pin gate extension bushings are used in injection mold tooling to maintain accurate gate alignment between the sprue/gate components and the gate-forming insert. In assembly stages, the extension geometry stabilizes positioning and supports repeatable, smooth movement under load, helping prevent drift that can affect gate thickness and downstream weld formation.

• Automotive connector and terminal molds: The bushings’ stable fit-in operation supports consistent gate placement across high-repeat runs, which helps reduce variation in gate vestige and flow behavior.
• Electronics and small housing gates: By resisting wear during frequent maintenance and part insert changes, this variant helps protect sensitive gate interfaces while maintaining movement reliability.
• Precision multi-cavity systems: Tapered or head-specific types improve guiding during alignment, supporting reliable stack-up control when tolerances are tight.

Available steel options (notably M2/P21-equivalent SKH51 or NAK80) are selected for strong wear resistance and dependable motion performance where gate support surfaces experience repeated contact.

This series is offered in SKH51 and NAK80, enabling selection based on wear and toughness needs. SKH51 corresponds to the AISI M2 family of high-speed steels and is typically chosen for high wear resistance where gate support surfaces are repeatedly loaded.

• SKH51 (AISI M2 equivalent): Strong abrasive/wear performance with a hardness often in the high-HRC range; ideal for long life under frequent sliding/positioning cycles.
• NAK80: Commonly used for molds requiring balanced performance; generally emphasizes dimensional stability and toughness compared with more wear-focused tool steels.

Heat treatment is typically provided in a hardened and tempered state for these tool steels (exact HRC and process details depend on the supplier’s standard for the selected material and head type). Expect a trade-off between maximum hardness for wear resistance and toughness for resistance to chipping when selecting the steel option.

To select the correct pin gate extension bushing, match the interface dimensions to the mold’s gate/support stack-up and alignment surfaces. Use the provided ranges to choose the outer diameter D = 6, 8, 10, or 13 mm first; this must correspond to the bushing bore/guide feature in the mold base or gate system.

• Length L: fixed at 10–40 mm. Choose L to span the required support depth and ensure stable engagement without over-constraining movement.
• Taper angle A: available at 1–2 mm, 1–2 (alternate), and 1–3 mm (as listed). Select A to suit the guiding/centering behavior required during assembly.
• Tip diameter V: choose from the provided tip ranges 1.5–2.5, 2–3.5, 3–5, or 4.5–7 mm based on the mating gate interface geometry.
• VC (V dimension alteration): select from 1.5–3.5, 1.5–5, 1.5–7, or 1.5–6.9 mm to achieve the desired clearance/fit compensation.

When integrating into a mold cavity/core, prioritize tolerance stack-up: V/VC governs the effective tip engagement, so verify clearances against your cavity alignment tolerances and planned wear allowances.