Step Design Shaft Pin for Depth Control

Qimao Metal Manufacturer’s quality  Step Design Shaft Pin for Depth Control features a stepped diameter along its length. The larger diameter section—referred to as the step or shoulder—is machined to a precise width and concentricity. When the pin is driven into a housing bore, the step bottoms against the housing face. This creates a repeatable depth stop, eliminating the need for separate spacers or manual measurement during assembly. The smaller diameter section (pilot) guides insertion and provides the bearing or pivot surface. Step and pilot diameters are ground after heat treatment to hold tolerances within ±0.05. Surface finish is held to 16 Ra or better for consistent fit.

Product Parameter (Specification)

Product Feature

· Precision step for depth control

The Step Design Shaft Pin acts as a mechanical stop. Once it contacts the housing face, the pin stops—no shims, no measuring. Repeatable depth every time. Step face ground square within 0.0002 inches.

· Hard-ground surfaces

Through-hardened to 58-62 HRC, then centerless ground. Diameter holds ±0.0005 inches. Surface finish at 16 Ra. Slides into bushings without galling. Lasts millions of cycles.

· Groove options for retention

Add a snap ring groove near the tip to lock the pin in place. Add an O-ring groove behind the step to seal out debris. Machined in one setup so concentricity stays tight.

· Multiple material choices

52100 bearing steel for high wear. 4140 for toughness. 17-4 PH stainless for corrosion resistance. 440C for hardness in wet environments. Pick what fits your application.

· Straightness held within 0.001 inches per foot

Bent pins bind and wear housings unevenly. We straighten every pin after grinding. Rolling it on a surface plate reveals no wobble. Installation feels smooth from end to end.

· Chamfered pilot tip

The leading edge isn't a sharp corner. A 15-degree chamfer guides the pin into the bore. No shaving metal. No fighting to start the pin straight. Small detail, big difference on the assembly line.

Application

· Fixture locating pins

CNC workholding needs repeatable positioning. Step Design Shaft Pin for Depth Control locates the bore and stops at exact depth. Casting sits at correct Z-height every time. No operator measuring. No shims.

· Die set guide pins

Stamping dies need alignment plus over-travel protection. Step shoulder contacts bushing face. Prevents die from crushing itself. Replace the pin when worn, not the whole guide.

· Pivot shafts for assemblies

Some rotating parts need exact shaft protrusion. Step pin removes human error. Press until step stops. Used in engine linkages, valve trains, and medical devices.

· Injection mold components

Mold cores and slides require precise depth for part geometry. Step pin sets the core position. No adjustments during mold setup. Consistent part wall thickness shot after shot.

· Hydraulic valve bodies

Spool valves need shafts that stop at exact positions to align fluid ports. Step pin controls spool depth. Assemblers don't guess. Valves flow correctly on first test.

· Automotive jig and gauge fixtures

Quality check fixtures use step pins as go/no-go depth stops. Insert part, press pin, check gap. Fast pass/fail decisions on the production floor. No dial indicators needed.

· Robotic end-of-arm tooling

Grippers and tool changers need repeatable mounting points. Step pins locate tool plates at exact standoff distance. Robots change tools without reprogramming pick positions.

Production Details &Why us?

1. We grind the Step Design Shaft Pin for Depth Control in-house on CNC centerless machines. That means we control straightness and diameter from the same shop floor where we turn the blanks. 

2. No sending parts out to a third-party grinder who loses your lot. 

3. Our heat treat is done in batches with hardness verification reports for every run. When you need a non-standard step length—say 8.35mm instead of 8mm—we don't push back. We modify our program and run it. 4. Lead times for custom step pins typically run 10-12 working days. For standard sizes, we stock blanks and can ship ground pins in 5 days. 

5. We also provide full dimensional inspection reports with CMM data on critical features. No guessing. No "close enough." Just pins that drop in and stop exactly where you designed them to stop.