Customize High Precision OEM Design CNC 4340 Billet Oil Pump Gear
Place of Origin : Fujian, China
Type : Milling, Turning, Wire EDM
Micro Machining or Not : Micro Machining
Model Number : CMP-301
Brand Name : JSD
Product name : CNC 4340 Billet Oil Pump Gear
Material : steel
Surface treatment : Painting\Powder Coating\Plating\Polishing
Process : Cnc Machining + Surface Treatment
Equipment : 3/4/5 Axis CNC Machining Center
Service : Customized OEM
Size : Customizesd Size
OEM/ODM : OEM ODM Non-standard Processing
Tolerance : 0.01- +/-0.005mm
Certification : ISO9001
Description
Quick Specifications
Key parameters for custom oil pump gear manufacturing at Goldcattle. All values represent standard capability; tighter specifications available upon request.
Process
5-Axis CNC + Gear Hobbing
CNC milling, turning, gear hobbing, gear grinding, wire EDM, and broaching for complete gear geometry.
Tolerance
±0.01 mm Standard
Critical dimensions ±0.005 mm after grinding. Gear profile per AGMA/DIN class.
Build Range
Max Diameter 500 mm
Gear module 0.5–8. Custom module, tooth count, and pressure angle per drawing.
| Parameter | Specification | Notes |
|---|---|---|
| Process | 5-Axis CNC, Turning, Gear Hobbing, Grinding | Complete gear geometry from blank to finish |
| Material | 4340, 4140, 8620, 20CrMnTi, 17-4PH, 316L | Alloy steels, stainless, tool steel available |
| Tolerance | ±0.01 mm standard / ±0.005 mm critical | Post-grinding precision for tooth profile |
| Gear Module | 0.5–8 Module | Custom module per application requirement |
| Max Diameter | 500 mm | Larger assemblies via segmented machining |
| Heat Treatment | Quenching, Tempering, Carburizing, Nitriding, Induction | Vacuum furnace, cryogenic treatment optional |
| Inspection | CMM, Gear Measurement, Hardness, Roughness | Full inspection report with every order |
| File Format | STEP, IGES, Parasolid, DWG, DXF, SolidWorks | DFM review included with every quotation |
Manufacturing Capability
XiaMen Goldcattle operates multi-axis CNC machining centers, gear hobbing machines, and gear grinding systems configured for oil pump gear production. Every part undergoes dimensional validation on Zeiss CMM and gear measurement equipment.
5-Axis CNC Milling
Complex gear housing and spline profiles from DMG MORI and Mazak 5-axis centers.
Gear Hobbing
Involute and spline tooth profiles with module 0.5–8, pressure angle 14.5°–25°.
Gear Grinding
Post-hardening finish grinding for tooth accuracy per AGMA Q12 or DIN Class 5.
Wire EDM
Internal spline and keyway profiles for gears requiring tight slot tolerances.
CNC Turning
Shaft and hub geometry from cylindrical blanks, ±0.01 mm concentricity.
Broaching
Internal keyways and hex/square bores for oil pump shaft interfaces.
Thread Milling
Mounting threads and fastener holes per ISO metric or UNC/UNF standards.
Surface Grinding
Flat face and reference surface finishing, Ra ≤ 0.4 μm achievable.
Available Materials
Common gear alloys stocked at Goldcattle. Additional specialty materials available on request with full material certification and traceability.
| Material | Hardness (HRC) | Key Property | Typical Application |
|---|---|---|---|
| AISI 4340 | 28–58 (heat treated) | High strength, toughness | Oil pump gear, crankshaft |
| AISI 4140 | 28–55 | General machinery, moderate fatigue | Industrial gear, pump shaft |
| AISI 8620 | 58–62 (carburized case) | Carburizing grade, hard case | Transmission gear, spline |
| 20CrMnTi | 56–62 (carburized) | Chinese standard, high wear | Gearbox gear, automotive |
| 17-4PH | 36–44 (H900) | Precipitation-hardened SS | Corrosive environment gear |
| 316L SS | ≤22 (as-supplied) | Corrosion resistance, weldability | Marine pump, food-grade |
Technical Specifications
Design parameters and manufacturing limits for custom oil pump gear production at Goldcattle.
| Parameter | Value |
|---|---|
| Gear Module | 0.5–8 Module |
| Tooth Count | 6–120 teeth (custom) |
| Pressure Angle | 14.5°, 20°, 25° (standard) |
| Max OD | 500 mm |
| Bore Range | 5–120 mm |
| Keyway / Spline | Custom per drawing |
| Dimensional Tol. | ±0.01 mm std / ±0.005 mm critical |
| Surface Roughness | Ra 1.6 as-machined / Ra 0.4 ground |
| Gear Accuracy | AGMA Q12 / DIN Class 5 |
| File Formats | STEP, IGES, Parasolid, DWG, DXF, SolidWorks |
Manufacturing Workflow
Standard production sequence for custom oil pump gears. Heat treatment and stress relief applied before finish grinding to preserve final accuracy.
Heat Treatment Options
Heat treatment is critical for gear longevity. Goldcattle provides in-house vacuum furnace, carburizing, nitriding, and cryogenic processing with full hardness certification per lot.
Quenching & Tempering
4340/4140 core hardening to 28–58 HRC. Vacuum quenched for minimal distortion.
Carburizing
8620/20CrMnTi case hardening, 0.5–2mm depth, 56–62 HRC surface.
Nitriding
Gas nitriding for wear resistance, 0.1–0.3mm case, no quench distortion.
Induction Hardening
Localized tooth flank hardening, rapid cycle, minimal part distortion.
Vacuum Heat Treatment
Bright, oxide-free finish. No surface contamination, ideal for precision gears.
Cryogenic Treatment
-80°C deep freeze to convert retained austenite, stabilizes dimensions.
Stress Relief
Post-machining tempering to relieve internal stresses before grinding.
Hardness Certification
Rockwell/Vickers hardness test per lot, documented in inspection report.
Surface Finish Options
Corrosion protection and appearance finishes for oil pump gears operating in engine, hydraulic, and industrial environments.
Black Oxide
Mild corrosion protection, no dimensional change, aesthetic dark finish.
Zinc Plating
Galvanic corrosion barrier, blue-bright or yellow chromate passivation.
Nickel Plating
Decorative and functional, wear-resistant, warm metallic sheen.
Phosphate
Zinc or manganese phosphate, oil-retaining surface for lubrication.
Polishing
Mirror finish Ra ≤ 0.1 μm, reduced friction for high-speed meshing.
Grinding
Precision ground tooth flanks, Ra 0.4–0.8 μm, functional finish.
Electroless Nickel
Uniform coating on complex geometry, 15–50 μm thickness, hard deposit.
Painting / Powder Coating
Industrial enamel or powder coat for external surfaces, multiple colors.
Quality Inspection Capability
Every oil pump gear undergoes multi-point dimensional and material validation before shipment. Full inspection report provided with each order.
CMM Dimensional Check
Zeiss CMM validates OD, bore, tooth thickness, runout per drawing spec.
Gear Measurement
Involute profile, lead, pitch, and composite error per AGMA/DIN standard.
Hardness Test
Rockwell/Vickers on surface and core, documented per heat treatment lot.
Runout Inspection
Radial and axial runout checked against tolerance for smooth meshing.
Tooth Profile Analysis
Involute deviation and tip/root modification verified against master profile.
Surface Roughness
Ra measurement on tooth flank, bore, and reference faces per specification.
Material Certification
Mill certificate with chemistry, mechanical properties, and heat traceability.
Inspection Report
Full dimensional + material + hardness report PDF provided with shipment.
Typical Applications
Oil pump gears manufactured at Goldcattle serve across automotive, industrial, and mobile equipment sectors.
Automotive Engine
Internal oil pump drive gear for gasoline and diesel passenger vehicles.
Motorcycle
Compact pump gear for small-engine lubrication systems, high RPM.
Hydraulic Pump
Spur and helical gears for fixed and variable displacement hydraulic units.
Diesel Engine
Heavy-duty gear train for commercial vehicle and stationary diesel power.
Industrial Gearbox
Helical and bevel gears for power transmission in factory equipment.
Oil Transfer Pump
Gear pair for lubricant and fuel transfer in pipeline and refinery service.
Agricultural Machinery
Tractor and combine harvester gearbox gears, heavy load, low speed.
Construction Equipment
Excavator and loader drive gears, shock load and contamination resistance.
Customization Options
Every gear is manufactured to your drawing specification. The following parameters can be tailored for your application.
Module
0.5–8 module, metric or DP. Custom fine-pitch available.
Number of Teeth
6–120 teeth, single or double helix configurations.
Pressure Angle
14.5°, 20°, or 25° standard. Non-standard on request.
Pitch Diameter
Custom per meshing requirement, up to 500 mm OD.
Bore & Keyway
Through-bore, blind bore, single/double keyway per drawing.
Spline Profile
Involute, straight, or serrated spline. Internal and external.
Surface Finish
Select from 8 finish options above, or specify custom requirement.
Heat Treatment
Specify hardness target and method; we match process to material.
Logo / Marking
Laser engraving or stamping of part number, brand, or traceability code.
Packaging
Individual VCI wrap, bulk pallet, or custom branded packaging per request.
Engineering Support
Our engineering team reviews every gear drawing before production. This prevents costly redesign and ensures first-run success.
DFM Review
We analyze your gear geometry for manufacturability before committing material. Identify undercuts, thin webs, and tolerance conflicts early.
Tolerance Analysis
Review functional vs. cosmetic dimensions to allocate machining effort where it matters. Avoid over-specifying non-critical features.
Material Recommendation
Suggest alloy and heat treatment based on load, speed, environment, and cost target. Often a 4140 alternative saves 15–20% over 4340.
Prototype Optimization
Single-piece or short-run prototype for functional testing before volume commitment. Design iterations within 7–10 day cycle.
Assembly Advice
Shaft fit, hub engagement, and meshing alignment recommendations based on our production experience across 500+ gear projects.
PPAP Documentation
Production Part Approval Process documentation per AIAG standard for automotive OEM requirements. Level 1–3 available.
Case Study
Real project examples from Goldcattle’s gear manufacturing experience.
CASE 1 • Automotive Oil Pump Gear
4340 + Nitriding Replacement
Client: European automotive parts distributor
Problem: Original 4140 gear insufficient wear life in high-pressure pump
Solution: Upgrade to 4340 + gas nitriding (0.15mm case, 58 HRC surface). CNC hobbing + gear grinding for AGMA Q10 accuracy.
Result: Service life increased 38%. First article delivered in 15 days.
CASE 2 • Hydraulic Pump Spur Gear
8620 Carburized + Black Oxide
Client: North American hydraulic equipment manufacturer
Problem: Gear noise and premature pitting under variable load
Solution: AISI 8620 carburized to 1.2mm case depth, tooth profile grinding to reduce meshing error. Black oxide for oil retention.
Result: Noise reduced 12 dB. Pitting eliminated after 2000-hour test.
CASE 3 • Marine Transfer Pump Gear
316L + Electroless Nickel
Client: Asian marine pump supplier
Problem: Corrosion failure in saltwater lubrication system
Solution: 316L base material + 25 μm electroless nickel coating. CNC milling from solid, no casting porosity.
Result: Zero corrosion at 12-month salt spray test. 500-unit monthly production.
Manufacturing Method Comparison
When selecting a gear production method, consider precision, cost, and application. CNC machining excels for custom, precision, and low-to-mid volume gears.
| Method | Precision | Cost per Unit | Best Use Case |
|---|---|---|---|
| CNC Machining | ★★★★★ | ★★★ | Custom, precision, prototype & mid-volume |
| Investment Casting | ★★ | ★★★★★ | Large volume, near-net shape, lower tolerance |
| Powder Metallurgy | ★★★ | ★★★★ | Automotive mass production, moderate load |
| Forging + CNC Finish | ★★★★★ | ★★ | Heavy-duty, high impact, large gear |
Why Choose XiaMen Goldcattle
XiaMen Goldcattle Plastic & Metal Products Co., Ltd. has manufactured precision metal components for international OEMs since 2008. Our CNC machining facility in Xiamen, China, serves automotive, industrial, and marine equipment manufacturers across Europe and North America with ISO 9001:2015 certified quality management.
Frequently Asked Questions
Common questions from purchasing engineers and mechanical designers ordering custom oil pump gears.
What is the difference between 4340 and 4140 for oil pump gears?
4340 contains nickel for higher toughness and fatigue resistance, achieving 58 HRC after quenching. 4140 lacks nickel, reaches 55 HRC max, and is more cost-effective for moderate-load applications. Select 4340 for high-pressure or impact-loaded pump gears; 4140 for general industrial service.
What hardness can you achieve on gear teeth?
Surface hardness depends on material and treatment: 4340 quenched 28–58 HRC, 8620 carburized case 56–62 HRC, nitrided 4340 58+ HRC surface with 0.1–0.3mm case depth, 17-4PH H900 condition 36–44 HRC throughout. Specify your target; we select the process.
Can you manufacture custom gear profiles?
Yes. We machine involute, cycloidal, and custom non-standard tooth profiles from your STEP or SolidWorks model. Module 0.5–8, any tooth count, and non-standard pressure angles are supported.
Can you provide AGMA or DIN inspection reports?
Yes. Our gear measurement system outputs involute profile, lead, pitch, and composite error data per AGMA 2000-A88 or DIN 3962 class. Inspection report is included with every production order.
What tolerances are available for gear machining?
Standard dimensional tolerance ±0.01 mm. Critical features (bore, tooth thickness, runout) ±0.005 mm after grinding. Surface roughness Ra 1.6 as-machined, Ra 0.4 ground. Gear accuracy AGMA Q12 / DIN Class 5 achievable.
Can gears be heat treated after machining?
Absolutely. Our standard workflow machines the blank, applies heat treatment, then finishes with grinding to restore accuracy lost during hardening. This “machine–harden–grind” sequence preserves final precision.
Do you support low-volume production?
Yes. We accept orders from 1 piece (prototype) to 10,000+ monthly. No minimum order quantity for custom gears. Prototype pricing is competitive because we machine from solid stock, no mold investment.
What CAD file formats do you accept?
STEP, IGES, Parasolid, SolidWorks (.sldprt/.sldasm), DWG, DXF, and PDF drawings. For gear orders, 3D model + 2D drawing with tooth specification is preferred. DFM review is included free with every quotation.
How long is typical production time?
Prototype / first article: 15 business days including heat treatment. Production orders: 20–30 days depending on quantity. Expedited 10-day available for urgent projects with surcharge.
Do you provide PPAP documentation?
Yes, per AIAG PPAP Level 1–3. Includes dimensional results, material certification, process flow diagram, and control plan. Required by most automotive OEMs and Tier 1 suppliers.
Need Custom Oil Pump Gears?
Upload your drawings for a DFM review and quotation. Our engineering team responds within 24 hours with material recommendations, tolerance analysis, and pricing.
