This rigid coupling sleeve is machined from 17-4PH stainless bar and then aged to condition H900, giving a clamp-type sleeve that transmits torque without the wind-up of a flexible element. Both ends carry a split clamp collar with socket head screws, one end has a machined keyway, and the through bore is finished by grinding after heat treatment so concentricity survives the hardening cycle. It is used for shaft trains that must stay rigidly aligned: ball screw to gearbox, test stand drive lines, machine tool spindles and servo axes with a separately supported shaft.

Heat treatment is what separates this part from a plain turned sleeve. Every dimension that matters is finished after aging, because 17-4PH moves in the H900 cycle.

Because the part is ground after aging, the bore is not affected by heat treat distortion, and the clamp collar slit is cut before hardening so the slit faces stay parallel without a secondary EDM operation. Hardness is verified on every lot, not only on the first article.

Rigid sleeves are built to the shaft interface, so bore, keyway and clamping details follow your drawings and torque requirement.

• Bore diameter from 5mm to 80mm, straight or stepped, with a different bore at each end.
• Keyway per DIN 6885 or ANSI, single or double keyway, spline or taper lock on request.
• Clamping: split clamp collar with socket head screws, double-split collar, or clamp plus keyway for high torque.
• Materials: 17-4PH for strength and corrosion resistance, 303 or 316L for moderate torque, 7075 aluminium for low inertia, 42CrMo4 with black oxide for heavy torque.
• Features: shoulders and spacers, flange mounting, cross holes, balancing lands, laser marking.
• Finishing: passivation, black oxide, nickel plating, bead blast.
• Prototype from 1 piece, same program and grinding setup kept for repeat orders.

Send the shaft diameters, keyway standard and torque figure, or a STEP model, and our engineering team confirms the clamp capacity, hardness and fit before quoting, usually within one to two working days.

Dongguan Changxinda Precision Technology Co., Ltd has been a custom CNC machining supplier since 2008, based in Dongguan, Guangdong, China. The facility operates turn-mill combined CNC lathes, 4-axis and 5-axis machining centers and CNC lathes with about 100 employees, including in-house CAM programming and a dedicated quality department. Over 200 customers are served in medical equipment, robotics, automotive, aerospace, automation, laser, LED, lithium battery and precision testing instruments, and 50-60 percent of output is exported. The company is ISO 9001:2015 certified, with annual sales between USD 10 and 20 million and in-house inspection on CMM and optical equipment. Couplings, sleeves, shafts with keyways and post-heat-treat grinding are established work, sharing the same capability used for robotics and fluid handling parts.

• Monthly capacity above 10,000 pieces for sleeves and couplings, with capacity reserved for repeat programmes.
• Typical lead time: 3-7 days for prototypes, 7-14 days for 10-100 pieces, 14-30 days for mass production, with heat treatment included in the quoted schedule.
• Heat treat lots are booked with a fixed process sheet, so hardness and growth stay consistent between shipments.
• Programs, grinding fixtures, gauge settings and the approved first article are archived against your part number.
• CMM, hardness and torque test reports ship with every lot, keeping incoming inspection short.
• Export packaging: bore plug, VCI paper, individual bag, desiccant, master carton, palletized for LCL or FCL.

Ball screw to gearbox connections on machine tools, servo axis shaft trains with a separately supported shaft, test stand and dynamometer drive lines, printing and packaging line drive shafts, pump and compressor shaft couplings, agricultural and construction drive shafts, and custom non-standard rigid shaft connections built to customer drawings.