Shoulder Screw

Shoulder screws, also known as precision shoulder screws, shoulder bolts, step screws, flat head shoulder screws, countersunk shoulder screws, or hex socket shoulder screws, are high-precision fasteners widely used in automotive, aerospace, industrial machinery, and electronic assemblies. Unlike standard bolts, shoulder screws feature a precision-machined unthreaded shoulder between the head and the threaded portion. This design provides exact alignment, smooth rotation, and controlled clamping force, making them ideal for applications that demand accuracy and reliability.

As a professional shoulder screw manufacturer and supplier, we offer both standard precision shoulder screws wholesale and custom shoulder screws OEM services. Customers can also buy shoulder screws online directly from our factory for faster delivery and cost advantages.

Key Features

• High Precision: Tolerances as tight as ±0.0005" (±0.0127 mm) with surface roughness Ra < 0.8 μm.

• Multiple Materials: Available in carbon steel, stainless steel, aluminum alloys, brass, and more.

• Custom Capabilities: OEM & ODM production for special dimensions, head types, and shoulder sizes.

• Versatile Head Designs: Options include flat head shoulder screws, countersunk shoulder screws, and hex socket shoulder screws.

• Durability: Heat-treated shoulders for high wear resistance and long service life.

• Factory Direct Supply: Competitive prices through shoulder screws factory direct sales.

Manufacturing Process

Our precision shoulder screws are produced using advanced CNC machining, turning, and milling processes, followed by heat treatment and grinding. This ensures high dimensional accuracy and excellent mechanical performance. Each precision shoulder bolt undergoes strict process control to guarantee consistent quality.

Material Selection

• Carbon Steel: High strength and cost-effective, suitable for heavy-duty applications.

• Stainless Steel (304, 316, 416): Excellent corrosion resistance, ideal for aerospace, marine, and Medical equipment.

• Aluminum Alloy (6061-T6, 7075): Lightweight with good machinability, widely used in electronics and automotive.

• Brass & Other Alloys: Non-magnetic, decorative, or conductive properties for specialized applications.

Surface Treatment Options

• Polishing – Improves surface smoothness for low-friction movement.

• Zinc / Nickel Plating – Corrosion resistance and aesthetic appearance.

• Black Oxide – Provides mild corrosion resistance with anti-glare finish.

• Anodizing (for Aluminum) – Enhances wear resistance and color customization.

Precision & Quality Control

• Tight Tolerance: Shoulder diameter precision within ±0.0005".

• Surface Finish: Ground finish with Ra < 0.8 μm.

• Testing Equipment: CMM (Coordinate Measuring Machine), hardness testers, roughness testers, and torque testing machines.

• Quality Standards: Conforms to ISO, DIN, and ANSI standards to ensure global compatibility.

Applications

• Automotive: Transmission systems, brake assemblies, throttle controls.

• Industrial Machinery: Fixtures, tooling, robotics, automation equipment.

• Aerospace & Defense: Aircraft interiors, avionics racks, precision linkages.

• Marine & Offshore: Corrosion-resistant fasteners for harsh environments.

• Medical & Electronics: MRI machines, surgical robots, electronic housings.

FAQ

Q1: Are you a shoulder screw manufacturer or trading company?
A: We are a direct shoulder screw manufacturer & supplier, providing both standard precision shoulder screws wholesale and custom shoulder screws OEM services.

Q2: Can you provide customized shoulder screws?
A: Yes, we specialize in custom shoulder screws OEM with options for size, material, head type, and surface treatment.

Q3: What is your lead time?
A: Standard products are available from stock. Custom precision shoulder screws usually take 2–4 weeks depending on complexity.

Q4: Do you offer factory direct sales?
A: Yes, we provide shoulder screws factory direct supply to reduce costs and shorten delivery times.

Q5: How can I buy shoulder screws online?
A: You can buy shoulder screws online from our official website or contact us for bulk orders.