Plastic Spur Gears with Steel Core

Steel hubs are fused and fixed to reinforced nylon gears for secure fastening.



Plastic gears are commonly used inside various machines such as food processing machines, home appliances, chemical-related machines, toys, and medical equipment.

Commonly used materials for plastic gears are engineering plastic polyoxymethylene (POM), polyamide MC nylon, U-PE, PEEK, etc.

In addition, when using plastic gears, if the ambient temperature changes significantly, the gear hole diameter is large, and the keyway load is large, S45C or stainless steel hubs are generally used. When using S45C or stainless steel hubs, the teeth and the hub are typically fixed with bolts. However, when the bolts cannot be repaired, spur gears use a fusion method to improve the teeth and the corner. HZPT's fused spur gears (steel core plastic spur gears) are designed to have more vital fused parts than the teeth of the gears.

Plastic gears have many advantages, such as being lightweight, no rust, and high quietness. In addition, there are many advantages, such as mass production can be achieved by injection molding, and no lubrication can be achieved by pairing with metal gears. On the other hand, plastic gears have shortcomings, such as low strength, ease of heat, and significant dimensional changes such as tooth clearance compared with metal gears. However, the degree of dimensional change easily caused by plastic gears varies depending on the material's resistance to temperature changes, water absorption, and chemical resistance.

Plastic Spur Gears with Steel Cores Specification
Precision Grade JIS grade N9 (JIS B1702-1: 1998) JIS grade 5 (JIS B1702: 1976)
Gear Teeth Standard full depth
Pressure Angle 20°
Material MC602ST with S45C core
Heat Treatment
Tooth Hardness (115 ~ 120HRR)
Primary information
Product No. NSU1-50
Module 1 Number Of Teeth 50
Shape S1 Bore (A) 10mm
Hub Diameter (B) 30mm Pitch Diameter (C) 50mm
Outside Diameter (D) 52mm Face Width (E) 10mm
Hub Width (F) 10mm Total Length (G) 20mm
Metal Core Diameter 34 Series Code 12
Backlash Low 0mm Backlash Up 0.34mm


Metal Inserts

Injection-molded metal inserts are used in plastic gears for a variety of reasons:

1. To avoid an extra finishing operation.

2. To achieve more excellent dimensional stability because the metal will shrink less and is not sensitive to moisture;

it is also a better heat sink.

3. To provide greater load-carrying capacity.

4. To provide increased rigidity.

5. To permit repeated assembly and disassembly.

6. To provide a more precise bore to shaft fit.

7. As durable support for fasteners, such as set screws to affix the gear to the shaft.

Inserts can be molded into the part or subsequently assembled. In the case of subsequent assembly, stress concentrations may be present and lead to cracking of the components. The interference limits for press fits must be obeyed depending on the material used; also, proper minimum wall thicknesses around the inserts must be observed. The insertion of inserts may be accomplished by ultrasonically driving in the insert. In this case, the material melts into the knurling at the insert periphery.

Inserts are usually produced by screw machines and made of aluminum or brass. It is advantageous to attempt to match the coefficient of thermal expansion of the plastic to the materials used for inserts. This will reduce the residual stresses in the plastic part of the gear during a contraction while cooling after molding.

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Product Quick Detail:

  • Standard and non-standard available
  • With high quality and competitive price
  • Prompt delivery
  • Packing as per customer’s demand.

We promise will offer the best price by the high quality in china! We also accept special order about the products. If you are interested in our products. Please do not hesitate to let us know.We are pleased to give you the detailed information.We promise that our products would be safety and were in high quality and reasonable price. If you are interested in our products, please contact us asap.We are sincerely looking for your cooperation.

Most of our products are exported to Europe or Americas, both standard and nonstandard products available. We can produce as per your drawing or sample. Material can be standard or as per your special request. If you choose us, you choose reliable.

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Materials Available

1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request
product materials available

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly
product finishing

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port
product packages