Spring Tension Pins

Do you need mechanical positioning? You want a "click" feel when the part reaches the right spot. Our Spring Tension Pin does this job. It has a spring inside. The front ball or pin can go in and out. When the part arrives, the pin locks into place. We are a Shanghai factory. We have made fasteners for 20 years.

We take a φ6 mm (outer diameter) spring pin as an example. The initial spring force (pin fully out) is 5-10 N. The final compression force (pin fully pressed into the body) is 15-25 N. The pin stick-out length is 1.0-3.0 mm. The compression stroke is 1.5-4.0 mm. The fit gap between the pin and the body guide hole is ≤0.05 mm. The positioning repeat accuracy is ±0.02 mm. Within the rated stroke and force range, the spring pin can handle 100,000 or more compression cycles. The spring will not break. The force will not drop much (force loss <10%). The material is 65MN spring steel. It gets quenching and medium temperature tempering. This gives a tempered troostite structure. The spring elastic limit is ≥800 MPa. Hardness is HRC 40-45. The pin head (ball or flat) gets local induction hardening. Surface hardness is HRC 50-55. It resists wear well. We offer two installation types. Press-in type: the body is smooth. You press it into a mounting hole (hole tolerance H7). Threaded type: the body has an outer thread. You use a nut or screw it into a threaded hole. This is easy to remove and change.

 

 

Why Our Surface Finish and Follow-up Service Help You

The top of the threaded type has a slot or internal hex. This helps you screw it in and adjust the depth. Front shape has three choices. Ball (roller) type: rolling friction with low wear. Good for frequent positioning. Flat (plunger) type: sliding friction with more precise positioning. Good for static or low frequency use. Point type: good for V-shaped groove positioning. Surface finish is black oxide or black phosphating. Black phosphating makes a phosphate layer. It resists rust better than black oxide. The surface is black and matte. It stops reflection. The friction coefficient is stable at 0.1 to 0.15. This is good for precision positioning. We have order trackers. They follow every step from your first inquiry to delivery. If your customer has problems, we have a person to talk and solve it. Typical uses: mold slider stops, ejector plate return check, indexing table positioning, cylinder end detection, fixture quick change, and drawer slide stops.

The entire product line is fully customizable.

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