Sprue Bushings Cooling Circuit Flange Thickness 10 mm

Q: Which material option should I choose for high-wear nozzle contact: SKD61 or SUS420J2 equivalent?

Select SKD61 when you prioritize wear resistance under demanding production cycles. The offered hardness can be up to 47–50 HRC , which supports aggressive nozzle-side contact conditions. If corrosion resistance is a concern or you need a stainless durability profile, choose the SUS420J2 equivalent variant within the specified hardness range ( 37–43 HRC or 47–50 HRC depending on configuration).

Q: How do I decide between Normal and String eliminator nozzle touch part specifications?

Use the Normal nozzle touch part when you want a standard nozzle-to-sprue interface alignment for typical sprue assemblies. Choose the String eliminator variant when stringing at the interface is a recurring issue and you want the nozzle contact geometry tailored for reduced string formation. The correct selection should also be validated against your sprue diameter P options ( 2–3.5 mm or 2–4.5 mm ) to maintain proper melt flow consistency.

Q: What taper angle (A) range matches my conical sprue/nozzle interface?

This series provides taper angle options at 0.5–2° or 0.5–3.5° . Match the option to the conical geometry of your nozzle contact zone so the bushing guides the nozzle without creating misalignment. After selecting A , verify the compatibility with your SR (nozzle part) = 10.5–20 mm and the required sprue diameter P range.

Q: How should I select the shaft diameter D and bearing bore length L for correct fit in the mold?

Choose D based on the sprue-side opening/guide bore: 16 mm or 20 mm . Then select L to provide sufficient support depth: 40–100 mm or 40–150 mm . Ensure the chosen L does not interfere with nearby sprue/cooling features and that the flange-to-bore engagement provides stable nozzle guidance during thermal cycling.

Q: Is the hardness range (47–50 HRC vs 37–43 HRC) a trade-off I should consider for toughness?

Yes. The product supports hardness selections of 47–50 HRC and 37–43 HRC . Higher hardness generally improves wear resistance at the nozzle contact and groove regions, while lower hardness can improve toughness and help manage thermal shock sensitivity. Your selection should be coordinated with cycle rate, expected nozzle loads, and whether you choose SKD61 or the SUS420J2-equivalent stainless variant.

Sprue bushings cooling circuit flange thickness 10 mm are designed to integrate into sprue systems around the cooling circuit, providing stable nozzle guidance and consistent melt flow control during molding. Straight tip matching supports reliable alignment on the sprue side.

Cooling-circuit integrated bushing design for controlled nozzle positioning
Material options include SKD61 or SUS420J2 equivalent for wear resistance
Selectable hardness ranges up to 47–50 HRC for demanding production cycles
Common nozzle interface options support normal contact or string eliminator configurations

Request a Quote Back to Category

Specifications

12 configurations available

Material	Nozzle Touch Part Specification	D (Shaft Diameter) (mm)	L (Bearing bore length) (mm)	A (Taper angle at sprue) (°)	Hardness	CW (Groove width) (mm)	P (Sprue diameter) (mm)	SR (Nozzle part) (mm)	type
SKD61	Normal	16	40 ～ 100	0.5 ～ 2	-	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SKD61	Normal	20	40 ～ 150	0.5 ～ 3.5	-	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-
SKD61	String eliminator	16	40 ～ 100	0.5 ～ 2	-	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SKD61	String eliminator	20	40 ～ 150	0.5 ～ 3.5	-	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-
SUS420J2 Equivalent	Normal	16	40 ～ 100	0.5 ～ 2	47～50HRC	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SUS420J2 Equivalent	Normal	20	40 ～ 150	0.5 ～ 3.5	47～50HRC	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-
SUS420J2 Equivalent	String eliminator	16	40 ～ 100	0.5 ～ 2	47～50HRC	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SUS420J2 Equivalent	String eliminator	20	40 ～ 150	0.5 ～ 3.5	47～50HRC	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-
SUS420J2 Equivalent	Normal	16	40 ～ 100	0.5 ～ 2	37～43HRC	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SUS420J2 Equivalent	Normal	20	40 ～ 150	0.5 ～ 3.5	37～43HRC	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-
SUS420J2 Equivalent	String eliminator	16	40 ～ 100	0.5 ～ 2	37～43HRC	6 ～ 40	2 ～ 3.5	10.5 ～ 20	-
SUS420J2 Equivalent	String eliminator	20	40 ～ 150	0.5 ～ 3.5	37～43HRC	6 ～ 40	2 ～ 4.5	10.5 ～ 20	-

Product Guide

🏭Application Scenarios+

This sprue bushing flange is used in injection mold sprue assemblies where the cooling circuit must remain stable while supporting precise nozzle contact. Typical use cases include automotive connector molds, where repeated thermal cycling demands consistent melt flow and reliable alignment between nozzle and sprue side.

For consumer electronics housings and other thin-wall parts, the controlled nozzle positioning helps reduce variation in sprue temperature and can support repeatable packing behavior across high-cavity runs.

In medical device housings and assemblies requiring cleaner sprue conditions, the variant with a string eliminator nozzle touch part configuration is well suited to limit stringing at the interface. The provided material options (SKD61 or SUS420J2 equivalent) and hardness ranges support wear resistance under normal or stringent production cycles.

Integrates around the cooling circuit flange to improve positional stability.
Supports normal contact and string-eliminator nozzle interfaces for different sprue conditions.
Material/hardness selections match long-run wear demands.

🔧Material & Process Details+

Available steels are SKD61 and a SUS420J2 equivalent stainless option. SKD61 is commonly selected for hot-work and wear resistance performance, while the SUS420J2-equivalent material is chosen where corrosion resistance and surface durability are prioritized for sprue-side components.

Hardness is selectable in two ranges: 47–50 HRC for demanding production cycles, or 37–43 HRC when balancing toughness and machining relief is preferred. Higher hardness generally improves wear resistance at the nozzle contact region, but can reduce toughness under severe thermal shock if not matched to tool design and operating conditions.

Heat treatment is typically delivered in a hardened state suitable for bushing service; SKD61 parts are commonly supplied quenched and tempered to reach the requested HRC level, while the stainless variant is hardened to the specified hardness range for dimensional stability under repeated cycles.

SKD61: higher wear resistance target (up to 47–50 HRC).
SUS420J2 equivalent: stainless durability while maintaining the required hardness.

📐Sizing & Selection Guide+

Selection starts with matching the shaft diameter D and the overall bearing bore length L to the sprue-side geometry and support depth. This series is offered with D = 16 mm or 20 mm, and L = 40–100 mm or 40–150 mm depending on the configuration.

Next, align the taper angle A to the nozzle contact/conical sprue interface: options include 0.5–2° and 0.5–3.5°. The nozzle touch part specification must be selected as either Normal or String eliminator to suit the intended sprue condition.

Confirm interface geometry using the fixed and range parameters: SR (nozzle part) = 10.5–20 mm and CW (groove width) = 6–40 mm. The sprue diameter P must match your sprue assembly requirements (P = 2–3.5 mm or 2–4.5 mm), ensuring the bushing groove and nozzle contact region are sized for consistent melt flow.

Choose D to fit the cooling circuit flange opening and guide bore.
Choose L to provide adequate support length without over-interference.
Verify A, P, SR, and CW against cavity/core sprue alignment features.

Frequently Asked Questions

Which material option should I choose for high-wear nozzle contact: SKD61 or SUS420J2 equivalent?+

Select SKD61 when you prioritize wear resistance under demanding production cycles. The offered hardness can be up to 47–50 HRC, which supports aggressive nozzle-side contact conditions. If corrosion resistance is a concern or you need a stainless durability profile, choose the SUS420J2 equivalent variant within the specified hardness range (37–43 HRC or 47–50 HRC depending on configuration).

How do I decide between Normal and String eliminator nozzle touch part specifications?+

Use the Normal nozzle touch part when you want a standard nozzle-to-sprue interface alignment for typical sprue assemblies. Choose the String eliminator variant when stringing at the interface is a recurring issue and you want the nozzle contact geometry tailored for reduced string formation. The correct selection should also be validated against your sprue diameter P options (2–3.5 mm or 2–4.5 mm) to maintain proper melt flow consistency.

What taper angle (A) range matches my conical sprue/nozzle interface?+

This series provides taper angle options at 0.5–2° or 0.5–3.5°. Match the option to the conical geometry of your nozzle contact zone so the bushing guides the nozzle without creating misalignment. After selecting A, verify the compatibility with your SR (nozzle part) = 10.5–20 mm and the required sprue diameter P range.

How should I select the shaft diameter D and bearing bore length L for correct fit in the mold?+

Choose D based on the sprue-side opening/guide bore: 16 mm or 20 mm. Then select L to provide sufficient support depth: 40–100 mm or 40–150 mm. Ensure the chosen L does not interfere with nearby sprue/cooling features and that the flange-to-bore engagement provides stable nozzle guidance during thermal cycling.

Is the hardness range (47–50 HRC vs 37–43 HRC) a trade-off I should consider for toughness?+

Yes. The product supports hardness selections of 47–50 HRC and 37–43 HRC. Higher hardness generally improves wear resistance at the nozzle contact and groove regions, while lower hardness can improve toughness and help manage thermal shock sensitivity. Your selection should be coordinated with cycle rate, expected nozzle loads, and whether you choose SKD61 or the SUS420J2-equivalent stainless variant.