JIS Standard Steel Sprue Bushings - Bolt Fixing String Eliminator (Flange 10 mm)

This bolt-fixing sprue bushing with string-eliminator interface is used in injection mold tooling where the sprue nozzle must be mounted with repeatable alignment. The straight tip interface and 10 mm flange thickness help maintain concentric positioning between the sprue nozzle and the sprue bushing during high-cycle runs.

Common scenarios include:

• Automotive connector and small housing molds: helps stabilize sprue formation for consistent gate quality, reducing misalignment-induced flow defects.
• Appliance and industrial part molds: the string-eliminator touch geometry supports management of stringing at the sprue interface, improving ejection cleanliness.
• General-purpose production molds: bolted fixation enables straightforward maintenance and reliable reassembly when nozzle/sprue components are serviced.

Designed for a normal bolt connection and a JIS standard steel approach, this variant suits applications that prioritize alignment stability, repeatable assembly, and controlled sprue interface behavior.

Available steels include SKD61 (commonly regarded as an H13-equivalent tool steel for hot work) and an HPM1-equivalent option. These grades are selected for their balance of wear resistance and hot strength, which is important at the sprue/nozzle interface exposed to repeated thermal cycling.

• SKD61 (H13-equivalent): typically quenched and tempered for improved toughness while maintaining good wear performance under repeated heating.
• HPM1-equivalent: generally chosen when a different performance balance is required, such as tailored toughness/edge retention for tooling surfaces.

Hardness and trade-offs: at the hardened & tempered condition, expect strong wear resistance suitable for production sprue interfaces; increasing hardness can reduce toughness, so proper heat treatment is critical for preventing chipping or micro-cracking around the interface.

Select dimensions by matching the sprue bushing geometry to the sprue nozzle and cavity/core interface requirements. Start with D (shaft diameter) and choose from 10 mm, 13 mm, or 16 mm to fit the bushing pocket and guide features without interference.

• L (bearing bore length): available in 0–120 mm and 0–150 mm ranges—pick length based on how much support length you need for stable nozzle guidance and the effective engagement depth.
• A (taper angle at sprue): fixed range 0.5–4° to match the nozzle/bushing taper mating requirement.
• P (sprue diameter): fixed 2.5–4.5 mm—match to the target sprue size used for consistent flow.
• SR (nozzle part): 0–16 mm for the nozzle-side interface length/portion.

Plate thickness (Y) for the string eliminator is 0.5–0.6 mm. Confirm tolerance/fit at the bolt interface and tip contact surfaces to ensure repeatable alignment under clamping force and thermal expansion.