Geyontech Dongguan, Humen Town, Dongguan City, Dongguan City (2026)

27/10/2026

Gear machining process selection starts from drawing grade: Geyontech hobbing holds GB 6 to 7, shaping GB 5 to 6, shaving adds about one grade, and profile grinding reaches DIN 4 to 5.
Heat treatment deformation of gears reaches 0.01 to 0.05 mm, so the fixed sequence is rough machining, heat treatment, then finish machining such as profile grinding or gear honing.

The route called gear shaving before heat treatment improves the pre-shaving state by about one grade and suits final GB 6 to 7 requirements when profile grinding is not selected.
Internal gears, double gears, shouldered gears and splines can only use shaping, while external spur gears and helical gears can use all four routes.
A general gearbox gear marked DIN 7 to 8 can use hobbing plus heat treatment, while a DIN 4 to 5 drawing needs enough grinding allowance and profile grinding after heat treatment for low backlash and low noise.

Hardness: 20CrMnTi carburised HRC 58 to 63; 40Cr, 42CrMo, 45 # induction hardened HRC 50 to 55; 38CrMoAl, 40Cr nitrided HV 850 to 1100.

Racks follow a separate route of precision milling and grinding: a ground rack reaches DIN 6h25 with 0.036 mm total pitch error per 1000 mm, a precision-milled rack reaches DIN 8e27 at 0.08 mm and DIN 10e27 at 0.13 mm.
Common rack material is S45C and SCM440, with tooth surface high-frequency hardening at HRC 48 to 52 or tempering at HRC 18 to 20.

Geyontech external spur and helical gears cover module M0.5 to M20, and bevel gears are made to GB/T 11365 grade 5 to 6.
Worm gears cover Z1 to Z6 tooth forms.

Design and manufacturing engineers are invited to ask a technical question about module, tooth count, accuracy grade, heat treatment and operating condition.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

26/10/2026

Gear material selection starts with the 350 HBW soft/hard face line, which separates quenched-and-tempered gears from carburized gears.

A soft-face gear has a flank hardness of 350 HBW or below after quenching-and-tempering or normalizing, so teeth are cut first and heat-treated later. A hard-face gear has a flank hardness above 350 HBW or 45 HRC and up, so heat treatment comes first and grinding follows.

Hardness: 45 QT 217-255 HBW; 40Cr QT 241-286 HBW; 42CrMo QT 269-302 HBW; 40Cr surface hardening 45-55 HRC; 20CrMnTi carburized 58-62 HRC surface, 30-45 HRC core; QT600-3 as-cast/normalized 190-270 HBW.

A practical approach to how to choose gear material is to fix hardness first, because 40Cr in QT gives 241-286 HBW while 40Cr with surface hardening gives 45-55 HRC. Case depth for common medium-load gears runs 0.8-1.5 mm, and a case that is too shallow collapses under load while a case that is too deep reduces impact toughness.

Carburizing and quenching heats low-carbon steel with 0.15-0.25% C in a carbon-rich atmosphere so carbon diffuses into the surface, and the surface carbon rises to about 0.8% and hardens to 58-62 HRC after quenching and low-temperature tempering. The Ti and Mn in 20CrMnTi both raise hardenability, so thicker sections still harden through. Carburized parts need effective case depth measured to GB/T 9450, while QT parts need core hardness checked.

42CrMo can replace 40Cr when more strength is needed, but 20CrMnTi cannot be swapped for 40Cr directly because the heat treatment systems differ. Geyontech runs a process review before scheduling production on custom gear projects, so material, heat treatment and grinding process are reviewed together.

Ask a technical question if you are a design or manufacturing engineer working through gear material selection or case depth control.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/capabilities/?utm_source=facebook&utm_medium=social&utm_campaign=heat-material

24/10/2026

Gear material selection for carburised gearbox gears uses 20CrMnTi to GB/T 3077 with 0.17~0.23% C, as Geyontech's gear steel guide notes for high core toughness.

Geyontech's gear steel guide lists 20CrMnTi for automotive gearbox gears and differential gears because the grade combines carburising response with high core toughness. 40Cr is listed for medium-speed medium-load gears after quenching and tempering, 42CrMo for heavy-load gears and gear shafts, and 20CrMo for small-medium module gears with stable carburising and small distortion. 20CrMnTi corresponds to AISI 4320.

The gear steel chemical composition for 20CrMnTi is C 0.17~0.23%, Si 0.17~0.37%, Mn 0.80~1.10% and Cr 1.00~1.30% under GB/T 3077. Acceptance limits general porosity and center porosity to grade 2 or lower, nonmetallic inclusions to A≤2.5, B≤2.5, C≤2.0 and D≤2.0, and grain size to 5~8. Hardenability J values are controlled by GB/T 225.

Hardness: 20CrMnTi carburised and low-temperature tempered 30~42 HRC core; 40Cr quenched and tempered 241~286 HB; 42CrMo quenched and tempered 269~321 HB; 45 # quenched and tempered 217~255 HB.

For 20CrMnTi after carburising, quenching and low-temperature tempering, the guide records Rm ≥1080 MPa, ReL ≥835 MPa, elongation A ≥10% and impact energy Akv ≥55 J. The hardness after quenching and tempering for 40Cr, 42CrMo and 45 # is tied to the listed HB ranges, so grade choice follows load and section rather than a single headline value. 45 # follows GB/T 699, while 20CrMnTi, 40Cr, 42CrMo and 20CrMo follow GB/T 3077.

Design and manufacturing engineers can send a specific gear steel question with load, module and heat-treatment route for a technical answer.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/shaft/?utm_source=facebook&utm_medium=social&utm_campaign=shaft

22/10/2026

Geyontech applies the DIN gear accuracy standard to cylindrical gears under DIN 3961 to 3967, with DIN grades 1 to 12 covering pitch, profile and lead tolerances.

DIN 3962 defines single pitch deviation fpt, total pitch deviation Fp and k-pitch cumulative deviation fpk, so a gear pitch deviation tolerance for cylindrical gears separates local pitch error from cumulative pitch error. DIN 3963 defines radial and tangential composite tolerances, and DIN 3964 defines center distance deviation and axis parallelism for gear pairs.

The DIN gear accuracy grades for precision machine tool spindle gears are DIN 5 to 6, matching ISO 5 to 6 in the source comparison. DIN 4 to 6 covers precision machine tool spindle gears and aviation gears, with profile grinding and precision hobbing listed as machining methods. DIN 1 to 3 covers high-precision metrology instruments and standard gears, using profile grinding and gear honing.

DIN 7 to 8 serves general gearboxes and automotive transmissions, using shaving or hobbing plus heat treatment. DIN 9 to 12 serves low-speed heavy-duty machinery and agricultural machinery, using hobbing and shaping.

DIN gear accuracy: standards DIN 3961 to 3967; grades 1 to 12; pitch items fpt, Fp, fpk; profile tolerance ff per DIN 3962; lead tolerance fHβ 6 to 16 μm at grades 5 to 7; ISO 5 to 6 for precision machine tool and aviation gears; ISO 7 to 8 for automotive transmissions; ISO 7 to 9 for industrial gearboxes.

Design and manufacturing engineers can send a technical question about DIN gear accuracy grades, pitch tolerance items or lead tolerance selection.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

20/10/2026

Geyontech holds profile grinding tolerance to DIN 3 for spur gears and helical gears, while batch production runs at GB class 4 to 5.

Spur gears transmit at 98 to 99% efficiency and avoid axial force, so a gearbox builder in Europe can use spur gears in reduction gearboxes. Helical gears use a 0 to 30° helix angle for smooth mesh in high-speed transmission and low-noise positioning.

The comparison for how to choose gear material in spur gears and helical gears sets 20CrMnTi carburised to 58 to 62 HRC against 42CrMo quenched and tempered to 269 to 321 HB.

Carburising of 20CrMnTi sets case depth for carburized gears at 0.5 to 3.0 mm, and the 58 to 62 HRC surface requires profile grinding after heat treatment. Induction hardening of 40Cr or 45 steel gives a 1.0 to 5.0 mm layer at 48 to 58 HRC, and nitriding of 42CrMo gives a 0.1 to 0.6 mm layer at 900 to 1100 HV.

Hardness: 45 steel QT 217 to 255 HB; 40Cr QT 241 to 286 HB; 42CrMo QT 269 to 321 HB; 20CrMnTi carburised 58 to 62 HRC surface.

Hobbing handles a maximum module M12 and a diameter of at least 500 mm, while profile grinding reaches DIN 3 on a maximum module M10. CNC turning holds 0.005 mm and grinding holds 0.001 mm on gear work. A 45 steel spur gear or helical gear can hold GB class 6 to 8 after hobbing and quenching and tempering.

Design and manufacturing engineers can send a technical question about a specific module, helix angle, accuracy grade and heat treatment route.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

15/10/2026

Dongguan-based Geyontech achieves batch precision GB 4-5 in high-precision gear manufacturing, with gear grinding up to DIN 3 for spur, helical, bevel and worm gears.

13 years of gear industry experience support the Geyontech process route from forging or cutting through turning, hobbing or shaping, heat treatment for gears, finishing, edge deburring, surface treatment and final inspection. Heat treatment for gears includes carburising quench, tempering and nitriding. Surface treatment options include black oxide, zinc plating, Dacromet and shot blasting.

Precision: batch GB 4-5; gear grinding up to DIN 3; turning 0.005 mm; grinding 0.001 mm; hobbing fastest 5 seconds per tooth.

Gear hobbing on vertical or horizontal hobbing machines and shaping machines reaches GB 4, while worm wheel gear grinding machines and profile grinding machines reach DIN 3. Turning on CNC machining centers, CNC lathes, turn-mill composite machines and sliding head machines holds 0.005 mm, and CNC grinding on internal, external, plane and vertical grinders holds 0.001 mm.

Engineering work uses CAD 2D drawing, Solidworks 3D modeling, KISSsoft for gear design and strength check, Caxa for gear process design and Mastercam for process simulation. Multi-scheme comparison is part of the engineering workflow, and inspection uses a gear measuring center, CMM, image measuring instrument, hardness tester and meshing tester. Geyontech can issue various inspection reports.

Design and manufacturing engineers can send a technical question about gear design, strength check, process simulation or inspection for review.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

08/10/2026

Geyontech gear material selection uses 20CrMnTi under GB/T 3077 for carburised gears, giving a 30-42 HRC core after carburised quenching and low-temperature tempering.

Gear steel grades map to load and speed: 20CrMnTi for automotive gearbox and differential gears, 40Cr for medium-speed medium-load gears, 42CrMo for heavy-load gears and gear shafts, 20CrMo for small and medium module gears, 20CrNi2Mo for heavy vehicle axle gears, and 45 # for medium-low speed medium-load gears.

The first step in how to choose gear material is matching the chemistry window: 20CrMnTi has C 0.17-0.23%, Si 0.17-0.37%, Mn 0.80-1.10%, and Cr 1.00-1.30%, while Ni, Mo and Ti follow the selected grade under GB/T 3077. 45 # follows GB/T 699.

Hardness: 20CrMnTi carburised+low-temperature tempered core 30-42 HRC; 40Cr quenched and tempered 241-286 HB; 42CrMo quenched and tempered 269-321 HB; 20CrMo carburised+low-temperature tempered core 30-42 HRC; 20CrNi2Mo carburised+low-temperature tempered core 35-45 HRC; 45 # quenched and tempered 217-255 HB.

Mechanical properties include 20CrMnTi Rm ≥1080 MPa, ReL ≥835 MPa, A ≥10%, Akv ≥55 J; 20CrMo Rm ≥885 MPa, ReL ≥685 MPa, A ≥12%, Akv ≥55 J; and 45 # Rm ≥650 MPa, ReL ≥360 MPa, A ≥16%, Akv ≥39 J. For hardness after quenching and tempering, 40Cr reaches 241-286 HB and 42CrMo reaches 269-321 HB.

Macrostructure limits are general porosity ≤2 grade and center porosity ≤2 grade; non-metallic inclusions are A≤2.5, B≤2.5, C≤2.0 and D≤2.0; grain size is 5-8 grade. Hardenability is tested by end quench according to GB/T 225.

Design and manufacturing engineers can ask a technical question about gear steel selection for their gearbox gear or gear shaft application.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/shaft/?utm_source=facebook&utm_medium=social&utm_campaign=shaft

08/10/2026

Geyontech inspects spur gears, helical gears, bevel gears, worm gears, gear racks and spline shafts on a gear measuring centre, holding profile tolerances to DIN 3 and ISO 1328 grade 4-5.

The gear measuring centre covers cylindrical gears, bevel gears, worm gears with their worms, and splines, and issues a gear inspection report for each part. A coordinate measuring machine takes precision dimensions, an image measuring instrument reads profile, angle and radius, a roughness tester reports Ra, Rz, Rmax and Rq, and a contour instrument records profile shape, angle and radius.

Hobbing, shaping, shaving, profile grinding and helical milling produce the tooth geometry on parts from module M0.3 to M20, and the finished profile is checked against DIN 6h25, DIN 8e27, GB class 6-8 and the AGMA and JIS systems. A meshing tester confirms gear meshing on the assembled pair, and shop floor gauges such as outside micrometers, inside micrometers, vernier calipers, tooth thickness calipers, span micrometers, dial indicators, plug gauges, ring gauges and master gears cover the running measurement.

Hardness testing after quenching and tempering uses a Rockwell tester across HRA, HRB and HRC, a Brinell tester across HBW, and a microhardness tester across HV. For engineers asking how to verify gear material, a spectrometer checks grades such as 20CrMnTi, 42CrMo, S45C, SCM415 and case-hardening steel, and an ultrasonic flaw detector and a magnetic particle inspection machine look for internal and surface defects.

Hardness: 45 QT 217-255 HBW; 40Cr QT 241-286 HBW; 20CrMnTi carburised 58-62 HRC surface, 30-45 HRC core.

Carburising, induction hardening and nitriding set the case, and black oxide or Dacromet finishing is applied where corrosion protection is needed on gear racks, sprockets and CNC machined parts.

If you design gearboxes, robot joints or machine tool spindles, ask me which measurement on the gear measuring centre actually decides your fit.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

07/10/2026

Geyontech supports small-module gear batch order quality control with M0.25 and M0.3 gears held to ISO 1328-1 grade 5 to 6 and overall quenched to 50 to 60 HRC.

A transmission parts trader brought five drawings for small-module gears, with tooth counts from 11 to 59 and material options 42CrMo4, 16MnCr5 and X8CrNiS18-9. The smallest pitch circle diameter is about 3 mm, and the full tooth height is under 0.7 mm, so tool tip wear quickly shows on the tooth surface and both machining and inspection leave little room for error.

For gear material selection, 16MnCr5 carburising and quenching suits small gears under alternating loads, 42CrMo4 overall quenching suits conventional working conditions, and X8CrNiS18-9 stainless steel addresses corrosion resistance. The small module gear inspection method combines span pin distance measurement with projection magnification checks, while tooth pitch, profile, helix and hardness are recorded item by item.

Hardness: overall quenched 50 to 60 HRC; Module: M0.25 and M0.3; Teeth: 11 to 59; Accuracy: ISO 1328-1 grade 5 to 6; Batch: 4000 pieces per model, 20000 pieces total; Material options: 42CrMo4, 16MnCr5, X8CrNiS18-9; Smallest pitch diameter: about 3 mm; Full tooth height: under 0.7 mm.

Precision CNC turning establishes the internal and external datum for small-module gears, and the tooth profile is produced by high precision hobbing or gear grinding. Incoming, in-process and outgoing inspections follow one unified route, and first article full dimension confirmation is completed before mass production starts.

A gear measuring center covers module 0.5 to 20, hardness testing includes Rockwell, Vickers and Brinell, and a roughness tester has resolution to 0.001 micron. Small-module parts also use span pin distance and projection magnification, and the full inspection report travels with the goods. Gear grinding accuracy can reach DIN 3.

If your design or manufacturing team is working on a small-module gear with tight profile, pitch or helix tolerance, send the drawing and ask the engineering question you need to close.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/sprocket/?utm_source=facebook&utm_medium=social&utm_campaign=sprocket

06/10/2026

DIN 3961 to DIN 3967 define cylindrical gear accuracy grades from DIN 1 to DIN 12, and Geyontech applies these grades to cylindrical gear manufacturing.

DIN 3961 sets the cylindrical gear accuracy grade system, while DIN 3962 covers individual tolerances for pitch, profile and lead. DIN 3963 handles radial and tangential composite tolerances, DIN 3964 controls gear pair center distance deviation and axis parallelism, and DIN 3967 defines tooth thickness tolerance and backlash.

DIN standard: DIN 3961 to DIN 3967; accuracy grades: DIN 1 to DIN 12; profile tolerance ff: grade 5 and grade 7, module ≥1 to 10; lead tolerance fHβ: grades 5~7 common 6~16 μm; export mapping: DIN 5~6 to ISO 5~6, DIN 7~8 to ISO 7~8, DIN 7~9 to ISO 7~9.

DIN 1 to DIN 3 suits high precision metrology instruments and standard gears, using gear grinding and gear honing. DIN 4 to DIN 6 is used for precision machine tool spindle gears and aviation gears, using gear grinding and precision hobbing. DIN 7 to DIN 8 covers general gearboxes and automotive transmissions, using gear shaving and hobbing plus heat treatment. DIN 9 to DIN 12 applies to low speed heavy duty machinery and agricultural machinery, using hobbing and shaping.

For export projects, precision machine tool and aviation gears map from DIN 5~6 to ISO 5~6, automotive transmissions map from DIN 7~8 to ISO 7~8, and industrial general gearboxes map from DIN 7~9 to ISO 7~9. Lead tolerance fHβ depends on helix angle, face width and accuracy grade, with 6~16 μm common for grades 5~7. Design and manufacturing engineers can send their DIN accuracy class, module and application with a technical question.

Geyontech — Dongguan Geyon Transmission Technology Co., Ltd., a precision gear and transmission-part manufacturer in Dongguan, China.
Full technical detail: https://www.geyontech.com/products/spur/?utm_source=facebook&utm_medium=social&utm_campaign=spur

Geyontech Dongguan

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