PSM Series Differential Adjuster

Product Description

• Modular manual differential actuator
• Coarse adjustment: 0.5 mm per revolution; Fine adjustment resolution: 2.5 μm
• Brass component mountable to Ø9.5 mm, M9.5×0.5 or M14×1.0 mounting sleeves
• Optional stroke range

The PSM series differential adjusters deliver high resolution and repeatability. A lever mechanism amplifies the resolution of the high-precision fine adjustment thread for minimal axial displacement.

 

Adjustment Screw	M6×0.5
Fine Adjustment Stroke	500 μm, 2.5 μm resolution
Coarse Adjustment Precision	0.5 mm/rev
Theoretical Precision	2.5 μm

 

Model	PSM25-A	PSM35-A
Dimensions	Ø16.5×70.7 mm	Ø16.5×81.2 mm
Coarse Adjustment Stroke	4 mm	11.6 mm, 14 mm (with stop ring removed)
Stop Ring	None	Equipped
Brass Mounting Diameter	Ø9.5 mm	Ø9.5 mm
Weight	50.8 g	52.8 g

 

Model	PSM25-B	PSM35-B
Dimensions	Ø16.5×70.7 mm	Ø16.5×81.2 mm
Coarse Adjustment Stroke	2.5 mm	5.65 mm, 8 mm (with stop ring removed)
Stop Ring	None	Equipped
Brass Mounting Thread	M9.5×0.5	M9.5×0.5
Weight	53.9 g	55.8 g

 

Model	PSM10-C	PSM25-C (with stop ring)	PSM35-C (with stop ring)
Dimensions	Ø16.5×56.2 mm	Ø16.5×70.7 mm	Ø16.5×81.2 mm
Coarse Adjustment Stroke	0.95 mm	9.65 mm, 12 mm (with stop ring removed)	19.65 mm, 22 mm (with stop ring removed)
Stop Ring	None	Equipped	Equipped
Brass Mounting Thread	M14×1.0	M14×1.0	M14×1.0
Weight	41.2 g	51.7 g	53.5 g

Technical Notes

The PSM series differential adjusters offer high resolution and repeatability. A lever mechanism amplifies the resolution of the high-precision fine adjustment thread to achieve minimal axial displacement. This unique design ensures uniform and smooth movement that is largely independent of load. The spherical tip guarantees single-point contact between the adjuster and the contact surface.

The differential adjuster features two internal lead screws: one drives the central spindle forward at a resolution of 0.5 mm per revolution, while the other retracts it at a precision of 0.375 mm per revolution. Thus, each full rotation of the graduated knob results in a total displacement of only 125 μm for the central spindle. The fine adjustment knob has a graduation of 2.5 μm, and the coarse adjustment pitch is 0.5 mm. (Note: For fine adjustment, the coarse adjustment mechanism must first be locked with the lock ring before operation.)

Brass Adapter	PSM-A Type	PSM-B Type	PSM-C Type
Product Image	–	–	–
Brass Dimensions	Ø12×15 mm	Ø12.9×16 mm	Ø15.8×7 mm
Mounting Specification	Ø9.5 mm	M9.5×0.5	M14×1.0

1. Application Example: Prior to installation, lubricate the adjuster lightly and screw it into the bushing manually. Ensure no thread cross-threading occurs to prevent damage to the adjuster and bushing.

Assembly

Application Examples

Engineering Drawings

 

PSM-C Engineering Drawing

PSM-B Engineering Drawing

PSM-A Engineering Drawing