A Shoulder Screw consists of three functional sections:
Head – Provides driving interface and load distribution
Shoulder (unthreaded section) – Precision-ground cylindrical shaft
Threaded section – Secures the fastener into tapped holes or nuts
The defining feature of a Shoulder Screw is the smooth, non-threaded shoulder. This section is manufactured with tight dimensional control, allowing it to function as a bearing surface or pivot point.
In mechanical systems, this structure replaces additional components such as dowel pins, spacers, or bushings, simplifying assembly while improving accuracy.
Shoulder Screw Key Functions
- Provides precise spacing between mechanical components
- Enables smooth rotational or sliding motion
- Reduces wear between contact surfaces
- Improves alignment accuracy in assemblies
- Supports repeated mechanical movement without deformation
Manufacturing Capabilities at Key-CNC
Key-CNC produces Shoulder Screw components using CNC precision machining and cold forming processes depending on design requirements.
Capabilities include:
- CNC turning & milling for custom shoulder geometry
- Tight tolerance control for shoulder diameter
- Custom thread machining (metric / imperial)
- Heat treatment for strength enhancement
- Surface finishing options for corrosion resistance
Available materials:
Aluminum (6061 / 7075)
Stainless Steel (304 / 316 / 17-4PH)
Carbon Steel / Alloy Steel
Titanium Grade 5
Types And Custom Options
We support multiple configurations of Shoulder Screw:
- Socket head shoulder screw
- Hex head shoulder screw
- Slotted shoulder screw
- Custom head design based on assembly needs
Customization options:
Shoulder diameter & length
Thread size & pitch
Head type & drive style
Surface finish (black oxide / anodizing / passivation)
To ensure consistent performance, Key-CNC applies strict inspection standards:
- Shoulder diameter tolerance control
- Thread gauge inspection (GO / NO-GO)
- CMM dimensional verification
- Surface roughness testing
- Hardness & material verification
Each Shoulder Screw batch is fully inspected before shipment.
Why Choose Us
Key-CNC provides integrated manufacturing for Shoulder Screw, covering machining, engineering support, and quality control.
1. In-house CNC Machining & Prototyping
Machining is fully controlled in-house, ensuring stable precision and fast turnaround for Shoulder Screw samples.
2. Flexible Customization Capability
Dimensions are fully customizable, including shoulder length, diameter, thread specification, and head geometry.
3. Stable Batch Production
Consistent process parameters are maintained to ensure uniform Shoulder Screw quality across all production volumes.
4. DFM Engineering Support
Design files are reviewed to optimize manufacturability, structural performance, and machining efficiency.
5. Strict Quality Inspection
Each Shoulder Screw undergoes dimensional, thread, and surface inspections before final shipment approval.
Frequently Asked Questions
What is the main difference between a Shoulder Screw and a standard screw?
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A Shoulder Screw includes a precision-ground shaft section designed for motion control, while standard screws are only for fastening.
Can Shoulder Screw dimensions be customized?
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Yes, both shoulder diameter and length can be fully customized based on engineering requirements.
What materials are recommended for high-load applications?
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Alloy steel and stainless steel 17-4PH are commonly used for high-strength applications.
Can you manufacture based on drawings?
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Yes, we support full custom manufacturing based on CAD drawings or samples.
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