Knurled Adjustment Pin vs Other Pin Fasteners
Several pin-style fasteners may look similar, but each serves a different purpose. The main difference is whether the part provides adjustable movement, fixed positioning, or simple retention.
| Product Type | Working Principle | Operation | Main Purpose |
|---|---|---|---|
| Custom knurled adjustment pin | Thread converts hand rotation into controlled axial movement | Manual | Repeatable position adjustment |
| Lockable index plunger | Spring-loaded pin retracts and locks in position | Manual | Quick indexing and positioning |
| Straight knurled dowel pin | Knurled surface creates a permanent press fit | Press-in | Fixed locating without adjustment |
| Knurled thumb screw | Finger tightening applies clamping force | Manual | Fastening and clamping |
| D shape safety pin | Over-centre loop locks the pin securely | Manual | Captive retention |
| Slotted spring pin | Radial spring force holds the pin in the hole | Press-in | Permanent or semi-permanent locating |
Materials and Finishes for Hand-Driven Service
Material selection for a knurled adjustment pin depends more on knurl forming, thread performance, and environmental resistance than maximum strength. Stainless steel provides corrosion resistance but requires higher knurling force due to work hardening, while aluminium forms easily but offers lower wear resistance under repeated adjustment.
- 303 / 304 Stainless Steel - The most common choice for general applications. It offers good corrosion resistance, clean machining, and reliable thread and knurl performance.
- 316 / 316L Stainless Steel - Selected for marine, chloride, medical, and harsh cleaning environments where higher corrosion resistance is required.
- 17-4 PH Stainless Steel - Used when higher strength and torque resistance are needed. Heat-treated conditions such as H900 or H1025 provide increased mechanical performance.
- Carbon and Alloy Steel (12L14, 4140) - A cost-effective option for dry indoor applications. Black oxide or zinc plating is typically used for corrosion protection, while 4140 suits higher-load positioning applications.
- Brass C36000 - Suitable for applications requiring conductivity or non-magnetic properties. It machines well but has lower wear resistance than steel.
- Aluminium 6061 / 7075 - Used for lightweight applications where the pin carries minimal load. Anodizing is generally avoided after knurling to maintain grip quality.
Finishes are typically application-driven: passivation for stainless steel, black oxide or plating for carbon steel, and minimal coating for brass and aluminium unless environmental protection is required.
Common Applications of Knurled Adjustment Pins
Knurled adjustment pins are used across industries where operators need repeatable positioning with quick, tool-free adjustment.
| Application | Why It Is Used | Typical Specification |
|---|---|---|
| Inspection fixtures & metrology jigs | Frequent position changes without hand tools | 304 stainless, diamond knurl, M6/M8 thread |
| Packaging equipment | Adjustable locating points for different product formats | 303 stainless or 12L14, diamond knurl, M8×1.25 thread |
| Laboratory instruments | Stable and repeatable adjustment during calibration | 316L stainless, fine thread, M6×0.5 |
| Optical & camera mounts | Secure positioning with easy manual re-adjustment | 6061 aluminium or 303 stainless, diamond knurl |
| Robotic end-of-arm tooling | Manual adjustment backup during maintenance and setup | 303 stainless or 17-4 PH, M5/M6 thread |
Custom Knurled Adjustment Pin Process
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