3/8 G & GD Series Precision Small Universal Joint Coupling

High-Precision Flexible Shaft Joint for Machine Tools, Hand Sockets & Automation Transmission

The G & GD Series Precision Small Universal Joint is a versatile, high-speed flexible shaft coupler designed for machine tools, multi-spindle drilling heads, automated packaging equipment, and hand socket tools[cite: 16]. Manufactured with high-strength 42CrMo alloy steel hubs and heat-treated internal cross pins and bushings (using premium 40Cr, 20CrMo, or SUS304 stainless steel)[cite: 16], this universal joint accommodates operating angles up to 90 degrees[cite: 16]. Supporting speeds up to 4,000 RPM and nominal torque up to 1,500 N·m[cite: 16], the G/GD series ensures smooth, compact, and highly efficient angular motion control[cite: 16].

Key Advantages & Features

• Premium Alloy & Stainless Steel Materials: Pins, bushings, and center blocks are precision-machined from alloy steel (40Cr, 42CrMo, 20CrMo, 20CrMnVB) or stainless steel (SUS304 / SUS316) for high wear resistance and structural longevity[cite: 16].
• Wide Operating Angle Range: Supports smooth articulation angles from 0° up to 90°, making it ideal for tight spaces and complex angular drive paths[cite: 16].
• High-Speed & High-Torque Capacity: Designed to perform reliably at maximum rotational speeds of up to 4,000 RPM with torque ratings ranging from 4.5 N·m to 1,500 N·m[cite: 16].
• H7 Precision Finished Bores: Standardized shaft bores are machined within H7 tolerance, available with keyways, square holes, or hexagonal profiles[cite: 16].
• Lightweight & Insulating Options: Sleeve hubs can be customized with high-strength aluminum alloy or insulating nylon for specialty electrical applications[cite: 16].
• Single (G Type) & Double (GD Type) Structures: Single joint options (G-Type) handle uniform angle connections, while double joint options (GD-Type) handle dual offset angular alignment[cite: 16].

Technical Specifications

Applications & Machinery Compatibility

The G & GD series precision universal joints are widely utilized across industrial power transmission and mechanical adjustment mechanisms[cite: 16], including:

• Machine Tools & Tooling Accessories: Multi-spindle drills, tapping machines, lathe drives, and 3/8 hand socket extensions[cite: 16].
• Food & Beverage Processing: Stainless steel conveyor drives, filling machinery, and packaging lines[cite: 16].
• Printing & Paper Equipment: Printing machinery, paper processing drives, and textile machinery[cite: 16].
• Construction & Agricultural Equipment: Steering linkages, auxiliary drive shafts, and small machinery transmissions[cite: 16].

Customization & Connection Options

At ApexCoupling, we offer custom shaft connections to match specific machinery requirements[cite: 16]:

• Internal spline shaft bore or external spline shaft ends[cite: 16].
• Round bore with pin holes, optical shaft with keyway, or square/hexagonal bores[cite: 16].
• Small flange connection ends and custom overall lengths[cite: 16].
• SUS304/SUS316 full stainless steel construction for cleanroom, medical, or marine use[cite: 16].

To request a fast quotation, please specify your required universal joint model (G or GD style), outer diameter, inner bore diameter and profile type (keyway, hex, square, or round), working angle, and quantity[cite: 16].

How to Order / Get a Fast Quote

Looking for reliable G/GD series precision small universal joints or custom machine tool flexible accessories[cite: 16]? Contact our sales engineering team today!

• Email: ella@apexcoupling.com
• WhatsApp / WeChat: +86 13437856962
• Website: www.apexcoupling.com
• MOQ: 1 Piece (Sample testing, batch orders, and bulk OEM supplies fully supported)[cite: 16]