🏗️ Heavy-Duty & High-Impact Transmission
Construction & Mining Machinery
High-torque, impact-resistant gears, girth rings, and planetary drive sets engineered for excavators, cranes, drilling rigs, and heavy mining crushers.
custom inch gears manufacturer
Custom Inch and DP Gears
Diametral pitch (DP) gears, pinions, and racks manufactured to Imperial dimensions for imported machinery, legacy gearboxes, and OEM export programs.
Customization
100% to CAD / Sample
Precision Grade
DIN 4-7 / AGMA 11-13
DFM Analysis
< 24 Hours Turnaround
Quality System
ISO 9001:2015
Product overview
Custom Inch and DP Gears manufacturing starts with confirmed technical requirements.
Review the gear pair, assembly conditions, drawing requirements, specification checks, and inspection points before requesting a quotation.
Custom inch gears are designed around Diametral Pitch (DP) — the number of teeth per inch of pitch diameter (DP = N / D_inch) — with dimensions, bores, hubs, and keyways specified in fractional or decimal inches. They remain essential for North American industrial machinery, agricultural equipment, machine tool replacements, and legacy power transmission rebuilds. ZhongYi manufactures custom DP spur gears, helical gears, bevel gears, and inch gear racks from engineering drawings or worn physical samples. Technical review covers Diametral Pitch (DP 4 to DP 48), pressure angle (14.5° legacy standard or 20° standard), pitch diameter, tooth count, face width, inch finished bore (with ANSI B17.1 keyways), material specification (AISI grades), and heat treatment.
Tooth Accuracy DIN 5-7 / AGMA 11-13
Tooth Finishing CNC Ground (Ra ≤0.4µm)
Hardness Grade Carburized 58-62 HRC
Custom Inch and DP Gears Factory Genuine Spec
Selection guidance
How to specify a custom inch and dp gears for quotation.
Use application and mating-component data to confirm geometry, materials, mounting details, and the acceptance plan.
Carefully determine whether the gear is designed in metric module or Diametral Pitch (DP). For example, Module 2 (pitch 6.283 mm) is close to DP 12.7, but meshing a Module gear with a DP gear will cause severe binding and tooth failure. Measure tooth count and outside diameter, and confirm the pressure angle (14.5° vs 20°). Provide the center distance and mating gear tooth count whenever reverse-engineering from a worn sample to ensure the original Diametral Pitch is correctly reconstructed.
Technical specifications
Core technical parameters for engineering and procurement review.
| Product type | Imperial Diametral Pitch (DP) spur gears, helical gears, bevel gears, and racks |
|---|---|
| Pitch standards | DP 4, 5, 6, 8, 10, 12, 16, 20, 24, 32, 48 (or fractional DP values by drawing) |
| Pressure angles | 14.5° (common in legacy machinery) or 20° (standard full-depth involute) |
| Bore & keyway | Inch bores (e.g. 0.500", 0.750", 1.000", 1.500", 2.000") with ANSI standard square/rectangular keyways |
| Materials | Carbon steel (AISI 1045), alloy steel (AISI 4140, 8620, 4340), stainless steel (304/316), bronze (SAE 660) |
| Manufacturing basis | Imperial 2D drawings, CAD models, or reverse engineering from physical sample gears |
Custom options
Manufacturing details that can be reviewed before quotation.
- Standard DP spur gears, helical gears, straight bevel gears, and DP gear racks
- 14.5-degree pressure angle cutters for vintage/legacy equipment reproduction
- Finished inch bores with setscrew holes, broached ANSI keyways, or inch splines
- Through-hardened, induction-hardened, or carburized and ground tooth finishing
- Direct reverse engineering from worn North American machinery samples
Quality control
Inspection points tied to the approved technical file.
- Verification of Imperial DP tooth parameters, pitch diameter, and pressure angle prior to tooling setup
- Inch-calibrated gauging for bore size, keyway width/depth (ANSI B17.1), and face width
- Tooth thickness over-pins (using inch ball sizes), runout, and pitch checks per drawing
- Material test reports (MTR) confirming chemical composition and hardness test records
All products can be custom manufactured from 2D/3D CAD drawings or physical samples.
Quality Control & Inspection Matrix
Engineering Evidence & 100% Inspection for Custom Inch and DP Gears.
Overseas procurement teams require verifiable technical data, not unsupported claims. Every production batch at ZhongYi is inspected against approved CAD blueprints and international standards (DIN, AGMA, ISO).
Component-Specific Quality Focus:
Imperial gears are inspected using inch-calibrated measuring instruments and pin gauges. All drawings, dimensions, tolerances, and inspection certificates retain original Imperial units to prevent conversion rounding errors. Quality documentation confirms compliance with approved drawing requirements.
Zeiss / Hexagon 3D CMM
Validates 3D spatial GD&T, bore concentricity, center distance, and geometric tolerances down to ±0.002 mm.
Klingelnberg CNC Gear Analyzer
Inspects involute tooth profile error (fα), lead crowning (fβ), pitch cumulative error (Fp), and radial runout (Fr).
Digital Micro-Vickers & Rockwell Testers
Verifies surface hardness (58–62 HRC), core toughness, and effective carburized / nitrided case depth gradient.
Direct-Reading Optical Spectrometer
100% chemical composition verification of alloy steel forgings (20CrMnTi, 42CrMo, 18CrNiMo7-6, Stainless, POM).
Inspection Deliverables with Every Shipment
Complete Batch Traceability & Certified Test Reports
- EN 10204 Type 3.1 Mill Test Certificate (Chemical & Mechanical Properties)
- Zeiss 3D CMM Full Dimensional Inspection Sheet
- Klingelnberg Tooth Profile & Lead Crowning Graph Report
- Effective Carburized Case Depth & Hardness Curve Data
- 100% Pre-Shipment Visual, Thread & Anti-Rust Quality Verification
Our Factory Quality Commitment:
We maintain strict incoming material spectroscopy, in-process CNC tooth coordinate monitoring, and 100% final pre-shipment dimensional inspection. All custom gear batches are backed by our full manufacturing warranty.
ISO 9001:2015 Certified
DIN 4-7 / AGMA 11-13 Standards
Applications
Custom Inch and DP Gears operating environments.
Confirm load, speed, duty cycle, environment, lubrication, and assembly constraints before selecting the final material and manufacturing route.
- North American imported machinery, agricultural equipment, and vintage gearboxes
- Oilfield equipment, forestry machinery, and mining winch transmissions
- Machine tool maintenance (lathes, milling machines, presses) with Imperial lead screws
- OEM export programs supplying assemblies to the US and Canadian markets
Application Markets
View All 5 Industry Hubs →
Where Custom Inch and DP Gears Are Engineered & Deployed
Discover how this gear category meets extreme torque, low backlash, quiet operation, and weather-resistance demands in primary industry sectors:
🤖 Sub-Arcminute Motion & Dynamic Positioning
Automation & Robotics
Low-backlash, ultra-precise fine-pitch gears, ground helical racks, and planetary gearheads for robotics, AGV wheel drives, and high-speed motion axes.
🌾 Rugged Heavy-Torque Transmission
Agriculture & Farm Equipment
High-torque bevel gears, spur gears, and splined drive shafts for tractors, harvesters, rotary tillers, and agricultural PTO gearboxes.
Technical FAQ
Common questions before ordering custom inch and dp gears products.
Critical specifications are confirmed against final drawings before production.
How can I tell if an old gear is Metric Module or Imperial DP? ▼
Calculate the nominal Diametral Pitch (DP = (N + 2) / OD_inch for standard 20° gears) and the nominal Module (m = OD_mm / (N + 2)). If the resulting DP is an integer or standard fraction (such as 8, 10, 12, 16), it is likely an inch DP gear. Providing the mating gear and center distance confirms the design.
Can ZhongYi broach ANSI standard inch keyways? ▼
Yes. We maintain tooling for standard ANSI B17.1 square and rectangular inch keyways, as well as set-screw threads in standard UNC / UNF imperial thread sizes.
Why is the pressure angle (14.5° vs 20°) important on DP gears? ▼
Older American machinery frequently used 14.5° pressure angles for quiet running, whereas modern gears typically use 20°. A 14.5° gear cannot mesh properly with a 20° gear even if both have the same Diametral Pitch.
24-Hour Engineering Quote & DFM Review
Upload Your Drawings for Custom Inch and DP Gears Manufacturing
Send your 2D blueprints or 3D CAD models. Our senior gear engineering team will review tooth geometry, module/pitch, materials, heat treatment feasibility, and provide transparent factory pricing within 24 hours.
Supported CAD Blueprint & Drawing Formats:
STEP (.step / .stp) AutoCAD (.dwg / .dxf) IGES (.igs) SolidWorks / 3D CAD PDF Technical Blueprints Worn Physical Samples
Mutual NDA Protection
We sign strict Non-Disclosure Agreements to safeguard proprietary designs.
< 24h DFM Feedback
Rapid manufacturability review, tolerance checks, and unit quotation.
Direct Factory Engineering
Direct technical communication with senior master gear artisans.
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