Steel Sprue Bushings
Complete range of steel sprue bushings — bolt fixing and shoulder types in 8–20 mm flange thicknesses, plus string eliminator, cooling circuit, extended nozzle, and environmentally friendly options.
Products
Bolt Fixing Sprue Bushings - Flange Thickness 10 mm | Environmentally Friendly | MISUMI
Bolt Fixing Sprue Bushings with 10 mm flange thickness support stable nozzle alignment and consistent sprue connection. Environmentally friendly desig
View Details
Sprue Bushings Shoulder Type, Flange Thickness 15 mm | Environmentally Friendly
Sprue Bushings Shoulder Type with 15 mm flange thickness for stable sprue alignment. Suitable for normal nozzle touch or resin pocket nozzles. Get eng
View Details
Bolt Fixing Sprue Bushing Flange Thickness 10 mm | Sprue Port P3.5 | Made for Mold Assemblies
Sprue Bushings - Bolt Fixing Flange Thickness 10 mm for sprue port P3.5 applications, straight tip matching, and secure bolt mounting in mold assembli
View Details
Sprue Bushings - Bolt Fixing, Flange Thickness 10 mm | Made for Reliable Nozzle Mounting
Sprue Bushings - Bolt Fixing, Flange Thickness 10 mm for stable nozzle installation. Select from multiple steels and tip matches. Request a quote.
View Details
JIS Standard Steel Sprue Bushings - Bolt Fixing String Eliminator (Flange 10 mm) | Factory Direct
Sprue Bushings - Bolt Fixing String Eliminator for sprue nozzle mounting with 10 mm flange thickness. Built for stable alignment and fast production.
View Details
Sprue Bushings - Bolt Fixing Flange Thickness 15 mm | Options for Normal or String Eliminator
Sprue Bushings - Bolt Fixing, Flange Thickness 15 mm for mold sprue mounting. Built for normal or string eliminator nozzle touch options—request a quo
View Details
Sprue Bushings - Bolt Fixing, Flange Thickness 20 mm | Steel Options | Flange-Mount
Sprue Bushings - Bolt Fixing, Flange Thickness 20 mm for securing sprue systems with stable bolt mounting. Choose steel options; improve assembly fit.
View Details
Sprue Bushings - Bolt Fixing, Flange Thickness 8 mm | Made for Reliable Nozzle Alignment
Sprue Bushings - Bolt Fixing, Flange Thickness 8 mm for stable nozzle alignment. Choose from steel options for durable, precision fit in injection mol
View Details
DIN Standard Steel SUB Type Sprue Bushings Hex Socket Head Cap Screws | Factory Direct
Primary Keyword: Sprue bushings with hex socket head cap screws. Steel SUB type. Designed for secure mold fit, alignment stability, and efficient inje
View Details
Old JIS A Type Sprue Bushings - Bolt Fixing, Flange Thickness 10 mm | Fast Delivery
Old JIS A Type Sprue Bushings for bolt fixing with 10 mm flange thickness. Support consistent nozzle seating, dependable alignment, and smooth resin f
View Details
Sprue Bushings Shoulder Type Flange Thickness 15 mm | Made for Injection Molding
Sprue Bushings Shoulder Type with 15 mm flange thickness for stable sprue positioning in injection molding. Choose steel options and tip styles for yo
View Details
Old JIS Standard Steel Sprue Bushings - JIS B Type, Shoulder Type | Fast Delivery
Old JIS Standard Steel Sprue Bushings - JIS B Type, Shoulder Type align and support injection molding nozzles, reducing wear and friction for reliable
View Details
Sprue Bushings with Locate Ring for Extended Nozzle | Tapered Tip | Fast Delivery
Sprue Bushings with Locate Ring for Extended Nozzle feature a tapered tip for stable alignment and extended nozzle support. Request a quote.
View Details
Small Diameter Extended Nozzle Sprue Bushings | Extension Type | Made to Order
Small Diameter Extended Nozzle Sprue Bushings for extension type sprue handling. Built for stable nozzle touch and tool compatibility—request a quote.
View Details
Sprue Bushings Bolt Fixing Flange Thickness 10 mm with Special Bolt | Fast Assembly
Sprue Bushings Bolt Fixing Flange Thickness 10 mm with Special Bolt (flange-mount) for reliable sprue alignment in injection molds. Industrial-grade a
View Details
Sprue Bushings Cooling Circuit Flange Thickness 10 mm | Steel Option | MISUMI Advantage
Sprue Bushings Cooling Circuit Flange Thickness 10 mm for sprue assemblies with controlled nozzle contact. Options in SKD61 or stainless steel variant
View DetailsCompare Sprue Bushing Variants
16 variants span two mounting types, four flange thicknesses, and multiple special features:
| Feature | Bolt Fixing (Standard) | Shoulder Type | String Eliminator | Cooling Circuit | Old JIS A/B |
|---|---|---|---|---|---|
| Mounting | Bolts through flange | Press-fit shoulder | Bolts through flange | Bolts through flange | Per legacy JIS spec |
| Flange Thickness | 8, 10, 15, 20 mm | 8, 10, 15 mm | 10, 15 mm | Varies | Per JIS standard |
| Special Feature | None (standard) | Compact mounting | Anti-stringing geometry | Internal water cooling | Legacy compatibility |
| Material | S55C / SKD61 | S55C / SKD61 | SKD61 | SKD61 / SUS | S55C |
| Best For | 80% of standard molds | Compact mold designs | PA, PET, TPU (stringing resins) | Fast-cycle, high-temp molds | Replacing bushings in old molds |
Mounting comparison: For detailed analysis, see our Bolt Fixing vs. Shoulder guide.
Step-by-Step Selection Guide
Four decisions narrow down your sprue bushing from 16 variants to 1:
Flange sizing: Most molds use 10 mm flange. For guidance on other thicknesses, see our Flange Thickness Selection Guide.
About Steel Sprue Bushings
Steel sprue bushings are the most fundamental component of any cold runner injection mold. They create the primary resin channel from the injection machine nozzle into the mold. MISUMI offers the widest range of sprue bushings in the industry — 16 variants covering all mounting types, flange thicknesses, and special features.
Application Scenarios
Different production environments need different sprue bushing features:
Standard Production Molds
General-purpose injection molds running commodity resins (ABS, PP, PE) at standard cycle times.
Standard bolt-fixing sprue bushing with 10 mm flange covers 80% of applications. No special features needed. Focus on matching SR and P to your injection machine nozzle.
Stringing-Prone Resins (PA, PET, TPU)
Resins that create thin filaments (strings) between the nozzle and sprue when the mold opens.
String eliminator geometry creates a cold slug at the nozzle tip that breaks the string during mold opening. Eliminates the production nuisance of strings on parts.
Fast-Cycle / High-Temperature Molds
Molds where cycle time is limited by sprue cooling, or processing high-temperature resins (PPS, PEEK, LCP).
Internal cooling circuit removes heat directly from the sprue area. Reduces sprue cooling time by 20-40%, shortening overall cycle time. Available in SKD61 or stainless steel.
Frequently Asked Questions
What flange thickness do I need for my mold plate?+
What does a string eliminator feature do in a sprue bushing?+
Are old JIS A/B type sprue bushings still dimensionally compatible with new molds?+
What is the benefit of sprue bushings with integrated cooling circuits?+
Can I get sprue bushings in stainless steel for corrosive resins?+
Engineering Resources
Bolt Fixing vs. Shoulder Sprue Bushings
Compare mounting methods for installation, alignment, and application.
How to Select Sprue Bushing Flange Thickness
Decision guide for 8, 10, 15, or 20 mm flange thickness.
Old JIS vs. Current Standard Sprue Bushings
Dimensional comparison and migration guide for legacy bushings.
Need a Custom Quote?
Specify your nozzle SR, sprue port diameter (P), flange thickness, mounting type (bolt/shoulder), and any special features (string eliminator, cooling circuit). Custom SR and P dimensions available.