Roller Shell | Ring Die | Flat Die Manufacturer

About BOBSHELL

Zhangjiakou Hongxing Machinery Co., Ltd. was founded in January 1998 in Zhangjiakou, a renowned industrial city in northern China. For over 26 years, we have specialized in the R&D and production of high-quality pellet mill spare parts.

Our BOBSHELL brand has served more than 1,200 clients worldwide and is a long-standing reliable supplier to global industry leaders such as GF, LA MECCANICA, CPM, BUHLER, and ANDRITZ.

Established in 1998
ISO9001:2000 Certified Since 2006
BOBSHELL Brand Registered in 2013

Our Premium Products

High-precision, durable, and customizable spare parts engineered for maximum efficiency in pellet production.

Roller Shells

Used in biomass and feed pellet production. Made from C50, 20MnCr5, GCr15. Hardness HRC58-62. Surface type can be customized.

Material: C50, 20MnCr5, GCr15

Hardness: HRC58-62

Customization: Surface type available

Ring Dies

Designed for high-efficiency pelletizing. Materials include X46Cr13/4Cr13 (stainless) or 20MnCr5/20CrMnTi (alloy steel). HRC > 50.

Material: Stainless or Alloy Steel

Hardness: Above HRC50

Customization: Aperture & compression ratio

Flat Dies

Precision-engineered flat dies for consistent pellet formation. Ideal for small to medium-scale pellet mills.

Application: Feed & biomass pellets

Material: High-carbon steel

Features: Durable, wear-resistant

Pellet Mill Units

Complete pellet mill systems designed for industrial-scale biomass and feed pellet production.

Capacity: 1–20 TPH

Power: 30–315 kW

Custom: Available upon request

Other Spare Parts

Bearings, shafts, liners, and other critical components to keep your pellet mill running smoothly.

Compatibility: Universal & OEM

Material: High-grade steel & alloys

Support: Full technical documentation

Custom Roller Shells

Tailored to your machine specifications. We manufacture roller shells based on your drawings or samples.

Customization: Full OEM support

Lead Time: 15–30 days

MOQ: 1 set

Stainless Ring Dies

Corrosion-resistant ring dies made from X46Cr13/4Cr13 stainless steel. Ideal for high-moisture biomass.

Material: X46Cr13 / 4Cr13

Hardness: HRC50-55

Use Case: Wet biomass, feed

Alloy Steel Dies

High-strength alloy steel dies (20MnCr5/20CrMnTi) for heavy-duty applications and extended service life.

Material: 20MnCr5, 20CrMnTi

Hardness: HRC52-58

Advantage: High wear resistance

Why Choose BOBSHELL

26+ Years of Experience

Since 1998, we’ve been perfecting the art of pellet mill spare parts manufacturing with deep industry expertise.

ISO9001 Certified

Our quality management system meets international standards, ensuring consistency and reliability in every product.

Global Trust

Trusted by over 1,200 clients and major brands like CPM, ANDRITZ, and BUHLER across 50+ countries.

Latest News

September 7, 2024

Comparing Roller Shells: Steel vs. Alloy

A detailed analysis of material performance in high-stress pellet mill environments. Learn which option suits your production needs best.

August 31, 2024

Can Roller Shells Enhance Pellet Production?

Discover how upgrading to high-precision BOBSHELL roller shells can increase output, reduce downtime, and improve pellet quality.

Get in Touch

Reach out for quotes, technical support, or custom manufacturing inquiries.

Email: [email protected]

Mobile/WeChat: +86 181 0323 9950

Tel: +86 313 5986 069

Visit Official Website

BOBSHELL – Global Leader in Pellet Mill Spare Parts