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China factory - Zhuzhou Sanxin Cemented Carbide Manufacturing Co., Ltd

Zhuzhou Sanxin Cemented Carbide Manufacturing Co., Ltd

  • China,Zhuzhou ,Hunan
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  3. 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear
China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear
China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear

  1. China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear
  2. China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear
  3. China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear
  4. China 375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear

375mm Length Tungsten Carbide Valve Pin with Spherical Tip R1.5mm for High Wear

  1. MOQ： 2
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Delivery Time 5-30days
Material 100% Virgin Tungsten Carbide,Carbide Pin +steel body,Carbide,heavy alloy,cobalt alooy
Grade YG6C/YG8C/YG11C/YG15C/ZD15,YG6,YG8,YK05,YG13C
Advantage High Wear Resistance,good wear ability,High Efficiency,Long Life,high hardness
Hardness 90.5HRA,87-91HRA,HRA86.5
Payment Terms T/T,L/C
Size OEM accepted,Customizable,Drawing Provided,Customized,D12* H60
Packaging Details Customized foam + plastic box + cardboard box
Type Power Tool Parts,Hand Tool Parts,Carbide Rods with a hole/ double helix holes,for auto parts (for small car,truck
Model Number SX1330
Certification ISO 9001:2015
Place of Origin China
Brand Name Sanxin

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  1. Product Details
  2. Company Details

Product Specification

Delivery Time 5-30days Material 100% Virgin Tungsten Carbide,Carbide Pin +steel body,Carbide,heavy alloy,cobalt alooy
Grade YG6C/YG8C/YG11C/YG15C/ZD15,YG6,YG8,YK05,YG13C Advantage High Wear Resistance,good wear ability,High Efficiency,Long Life,high hardness
Hardness 90.5HRA,87-91HRA,HRA86.5 Payment Terms T/T,L/C
Size OEM accepted,Customizable,Drawing Provided,Customized,D12* H60 Packaging Details Customized foam + plastic box + cardboard box
Type Power Tool Parts,Hand Tool Parts,Carbide Rods with a hole/ double helix holes,for auto parts (for small car,truck Model Number SX1330
Certification ISO 9001:2015 Place of Origin China
Brand Name Sanxin
High Light 375mm Length Tungsten Carbide Valve Pin ，Spherical Tip R1.5mm Valve Pin ，High Wear Resistance Carbide Valve Pin
Tungsten Carbide Valve Pin 375mm Length Spherical Tip R1.5mm for Hot Runner Injection Molding Systems
High-precision tungsten carbide valve pin at 375mm length with R1.5mm spherical radius tip for hot runner injection molding systems. HRA 90-92 hardness, sub-micron grain, mirror-polished finish. Ideal for glass-filled plastics, long thin-walled parts, and multi-cavity molds. Custom specifications available.
Product Overview
In hot runner injection molding, the valve pin is the critical component that controls melt flow, seals the gate, and determines the final quality of the molded part. When molding engineering plastics—especially those with glass fiber reinforcement—standard steel valve pins wear prematurely, leading to gate leakage, inconsistent part quality, and costly production downtime.
Our Tungsten Carbide Valve Pin is engineered specifically to meet these demanding requirements. With an overall length of 375mm and a spherical tip radius of R1.5mm, this precision-ground component delivers the exceptional hardness, wear resistance, and dimensional stability required for long-run, high-precision injection molding applications.
The 375mm length makes this valve pin particularly suitable for large molds, deep-cavity applications, and multi-point hot runner systems where extended reach is essential. The R1.5mm spherical tip geometry ensures clean gate sealing, minimal gate vestige, and consistent part quality across millions of molding cycles.
Key Specifications
Parameter Specification
Overall Length 375.00 mm
Tip Geometry Spherical radius R1.5mm
Material Tungsten Carbide (WC-Co)
Hardness HRA 90-92
Grain Size 0.8-2.0 μm (sub-micron)
Cobalt Content 6-10%
Density 14.45 g/cm³
Transverse Rupture Strength 3,200-3,800 MPa
Young's Modulus 570 GPa
Compressive Strength 4,700 MPa
Surface Finish Mirror-polished (Ra ≤ 0.05μm)
Tolerance Diameter: ±0.002mm; Length: ±0.05mm
The R1.5mm Spherical Tip: Design & Function
The spherical tip with R1.5mm radius is a critical design feature that directly impacts molding quality:
Key Functions:
  • Precise Gate Sealing: The spherical geometry ensures consistent, leak-free sealing against the valve seat, preventing drool and stringing.
  • Minimal Gate Vestige: The smooth spherical profile produces clean gate break-off, leaving minimal witness marks on the molded part.
  • Reduced Stress Concentration: The radiused tip distributes contact forces evenly, reducing the risk of tip damage or seat wear.
  • Smooth Material Flow: The spherical profile promotes consistent melt flow during injection, improving part quality and reducing cycle time.
Applications Requiring Spherical Tip Valve Pins:
Industry Application Why Spherical Tip
Automotive Interior trim, under-hood components, lighting Clean gate appearance; minimal vestige
Medical Precision devices, diagnostic components Consistent sealing; no contamination risk
Consumer Electronics Phone housings, laptop components High cosmetic requirements; no visible gate marks
Packaging Thin-walled containers, closures Extended tool life in high-cavity molds
Frequently Asked Questions (FAQ)
Q1: What is a valve pin used for in injection molding?
A valve pin is a critical component in hot runner systems that controls the flow of molten plastic into the mold cavity. It opens and closes the gate at precise intervals, sealing the nozzle between injection cycles to prevent drool and ensuring clean, consistent part quality.
Q2: Why choose tungsten carbide over steel for valve pins?
Tungsten carbide offers significantly higher hardness (HRA 90-92 vs. HRC 58-62 for tool steel), 10-30× greater wear resistance, and superior thermal stability. This translates to extended tool life, reduced downtime, and consistent part quality over millions of molding cycles.
Q3: What is the advantage of a spherical tip design?
A spherical tip provides precise gate sealing, minimizes gate vestige on the molded part, reduces stress concentration, and promotes smooth material flow during injection.
Tungsten Carbide Valve Pin with R1.5mm spherical tip for injection molding systems

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Manufacturer,Importer,Exporter,Seller,Other

  • Year Established:

    2003

  • Total Annual:

    8000000-10000000

  • Employee Number:

    150~180

  • Ecer Certification：

    Verified Supplier

Zhuzhou Sanxin Cemented Carbide Manufacturing Co.,Ltd is located in Zhuzhou, Hunan Province, which is known as the “Hometown of Cemented Carbide”. It is a national high-tech enterprise that has passed ISO9001:2015 international quality certification system, specializing in manufacturing,... Zhuzhou Sanxin Cemented Carbide Manufacturing Co.,Ltd is located in Zhuzhou, Hunan Province, which is known as the “Hometown of Cemented Carbide”. It is a national high-tech enterprise that has passed ISO9001:2015 international quality certification system, specializing in manufacturing,...

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Get in touch with us

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  • Zhuzhou Sanxin Cemented Carbide Manufacturing Co., Ltd
  • No. 8, Middle School Road, Baiguan Town, Lusong District, Zhuzhou, Hunan, China
  • https://www.tungstencarbidesteel.com/

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