20CrMnTi Low noise High temperature Sewing Machine Gears in China

20CrMnTi Low noise High temperature Sewing Machine Gears in China 

Sewing machine gears are core precision transmission components for all industrial and household sewing machines, including spur gears, helical gears, bevel gears, eccentric gears, duplex gears, feed gears, hook gears, etc. They fit flat-bed, double-needle, high-head, zigzag, buttonholing, tacking and other machines. Made of 45# steel, 40Cr, 20CrMnTi, 42CrMo with quenching & tempering + induction/carburizing hardening, they feature high precision, low noise, wear resistance, impact resistance, high torque and long service life. They transmit power and distribute motion for main shaft, upper/lower shaft, hook, feed dog, thread take-up, presser foot lift, thread trimming, directly determining stitch stability, synchronization accuracy, low breakage rate and machine durability. They are the “transmission heart” and key wearing parts of sewing machines.

 Product Features

• Precise transmission & synchronization: ISO Grade 6–7 accuracy, tooth surface Ra≤0.4μm, sync error ≤±0.1mm, flat and non-misaligned stitches.
• High hardness & long life: HRC 52–60 tooth surface, service life ≥7000–15000 hours, reducing downtime.
• Low noise & smooth operation: Helical/spiral design + polished surface, meshing clearance 0.06–0.15mm, noise ≤65dB.
• High torque & impact resistance: Module 0.8–2.5mm, thickened tooth root, withstand 30–180N·m torque, no chipping on thick materials.
• Wide adaptation & interchangeability: Fit flat/double-needle/high-head/zigzag/buttonhole machines; compatible with Juki, Brother, Zoje, Hikari, etc..
• Compact structure & space-saving: Thin hub, short tooth, small module design for narrow head space, no installation interference.
• High temperature & oil resistance: Stable heat treatment, no deformation at -5℃～+85℃, adapt to sewing oil mist environment.
• Diverse materials & cost-effective: 45# steel (economy), 40Cr (standard), 20CrMnTi (carburized heavy-duty), covering different budgets.

Technical Parameter Table

 Main Applications

• Gear sets for main shaft, lower shaft, hook and feed in industrial flat machines (single-needle/electronic).
• Matched bevel + helical gear sets for double-needle machines (842/845/872/6B).
• Heavy-duty transmission, hook drive and thick-material feed gears for high-head machines (8B/341/246).
• Zigzag stitch swing needle and feed eccentric gears.
• Special transmission gears for buttonholing, button tacking, bartacking and interlock machines.
• Drive gears for automatic trimming, reverse stitching, presser foot lift and thread wiper.
• Medium-thick material sewing equipment for apparel, denim, luggage, shoes, sofas, tents and leather goods.
• Replacement gears for old sewing machines (Juki, Brother, Zoje, Hikari, Jack, etc.).

 Product Advantages

• Precise transmission & stable stitches: Precise tooth profile + strict pairing, minimal sync error, less breakage & neat stitches.
• Wear resistance & long life: High-quality alloy steel + deep hardening, high hardness, wear & fatigue resistance, lower maintenance cost.
• High-speed stability & low noise: Smooth helical meshing, low vibration, no shake at high speed & quieter workshop.
• Wide adaptation & versatility: Fit all sewing machine types, good interchangeability, easy replacement & low inventory pressure.
• Thick material toughness & anti-chipping: Reinforced tooth root, withstand heavy load & impact without fracture, ideal for leather/thick materials.
• Compact structure & easy installation: Small module, thin hub, easy to install in narrow head space, no interference.
• High temperature & oil resistance: Stable heat treatment, no deformation under long-term high temp/oil, good precision retention.
• Cost-effective & flexible selection: Multi-material grades, full coverage from economy to heavy-duty, adapting to different budgets & conditions.

Production Process

• Raw material inspection: 45#/40Cr/20CrMnTi/42CrMo checked for composition, hardness, defects, no cracks or impurities.
• Cutting & forging/PM: Steel cutting → hot forging (heavy-duty) or powder metallurgy (precision small parts), enhance tooth root rigidity.
• Pre-heat treatment: Normalization/annealing eliminates forging stress, improves machinability.
• CNC finish turning: Precision turning of OD, ID, end face, concentricity ≤0.02mm, runout ≤0.01mm.
• Gear hobbing/milling/shaping: Specialized machines process teeth; bevel gears use spiral cutters, hook helical gears use spiral hobs.
• Chamfering & deburring: Tooth end chamfering & polishing, reduce noise & scratching.
• Quenching & tempering: Overall tempering to HRC 28–35, improve toughness & impact resistance.
• Tooth surface hardening: Induction hardening for spur gears; carburizing hardening for bevel/hook gears, HRC 52–60.
• Precision grinding: ID, journal, tooth surface grinding, Ra≤0.4μm, ISO 6–7 accuracy.
• Pairing & screening: Double-needle bevel+helical, hook gear sets lapped in pairs, phase error ≤±3 arcmin.
• Surface treatment: Blackening/phosphating + anti-rust oil; high-end DLC nano-coating optional, lower friction & higher wear resistance.
• Full inspection & warehousing: Comprehensive check of dimensions, hardness, meshing precision, synchronization, appearance, packaging, labeling, delivery.

Why Choose us?

• 7-axis CNC Grinding: We adopt high-precision 7-axis CNC grinding machines, holding tolerances as tight as ±5μm, ensuring gears run quietly, smoothly and with outstanding durability.
• Strong technical expertise: Our core R&D team includes doctoral and master’s professionals specializing in spiral bevel gear technology, providing strong technical support for complex projects.
• Rigorous testing & high precision: All gears undergo 100% inspection with Gleason metrology systems. We can achieve DIN 6 grade accuracy with strict control over tooth profile and direction errors, keeping our quality at the industry-leading level.
• High transmission efficiency: Our gear designs support a single-stage reduction ratio of up to 300:1, with actual transmission efficiency reaching over 95%, greatly improving energy utilization.
• Excellent durability & cost efficiency: Our gears deliver 40% lower lifecycle cost and a failure rate below 0.5%, ensuring stable long-term operation and reduced maintenance costs.
• Fast response & short lead time: Supported by our digitalized production process, we are able to shorten the delivery cycle to only 20 working days, helping you accelerate project development and launch.
• Professional custom design capability: We provide fully customized gear solutions for applications requiring high-reduction, high-speed, heavy-load, low-noise, and special small-tooth profiles, based on your actual working conditions.