INDUSTRY COMPONENT

Stop Block / Collar

A mechanical component that limits the stroke or movement range of machinery to prevent over-travel and ensure operational safety.

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Component Specifications

Definition
A stop block or collar is a precision-engineered component installed on linear or rotary motion systems to physically restrict the travel distance of moving parts. It serves as a positive mechanical stop that prevents components from exceeding their designed operational limits, thereby protecting equipment from damage caused by over-travel, reducing wear on critical components, and enhancing operator safety by preventing hazardous machine movements beyond safe boundaries.
Working Principle
The stop block/collar operates on the principle of mechanical interference. When installed at predetermined positions along a shaft, rail, or guide, it creates a physical barrier that prevents further movement when contacted by the moving component. This creates a hard stop that absorbs kinetic energy through controlled deformation or force distribution, effectively limiting the stroke to within safe operational parameters.
Materials
Typically manufactured from hardened steel (AISI 4140, 1045), stainless steel (304, 316), aluminum alloys (6061-T6), or engineered plastics (UHMW-PE, Delrin) depending on application requirements for strength, wear resistance, and corrosion protection.
Technical Parameters
  • Width/Height 5-50 mm
  • Load Capacity Up to 5000 N
  • Bore Tolerance H7/h6
  • Diameter Range 10-200 mm
  • Surface Hardness 45-60 HRC (steel variants)
  • Operating Temperature -40°C to 200°C
Standards
ISO 2768, DIN 6885, ISO 286-2

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Stop Block / Collar.

stop block stroke limiter mechanical stop machine safety positioning collar travel limit over-travel protection shaft collar linear motion rotary limit Stop Block / Collar Stop Block / Collar in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Stroke Limiter

A mechanical component that restricts the maximum travel distance of a moving part within a stroke length adjustment mechanism.

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Engineering Analysis

Risks & Mitigation
  • Impact damage from improper installation
  • Wear and deformation over time
  • Incorrect positioning leading to inadequate stroke limitation
  • Material fatigue under cyclic loading
  • Corrosion in harsh environments
FMEA Triads
Trigger: Improper torque application on fasteners
Failure: Stop block shifts position during operation
Mitigation: Use calibrated torque tools and thread-locking compounds
Trigger: Excessive impact forces
Failure: Material deformation or fracture
Mitigation: Install energy-absorbing bumpers and implement controlled deceleration
Trigger: Corrosive environment
Failure: Reduced structural integrity and binding
Mitigation: Select corrosion-resistant materials and apply protective coatings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Positional tolerance ±0.1 mm, dimensional tolerance IT7 grade
Test Method
Dimensional verification with micrometers, functional testing through controlled stroke cycles, impact resistance testing per ISO 13849

Buyer Feedback

★★★★☆ 4.7 / 5.0 (15 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Stop Block / Collar meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Stop Block / Collar arrived with full certification."

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Frequently Asked Questions

What is the difference between a stop block and a stop collar?

Stop blocks are typically rectangular or square components used on linear guides and rails, while stop collars are cylindrical components designed for shafts and rotary applications. Both serve the same fundamental purpose of limiting movement.

How do you properly install a stop block/collar?

Installation requires precise positioning along the travel path using measurement tools, secure fastening with appropriate hardware (set screws, clamping mechanisms), and verification through test cycles to ensure the stop engages at the correct position without causing impact damage.

Can stop blocks be adjusted after installation?

Yes, many designs feature adjustable positions through slotted mounting holes or repositionable clamping mechanisms, allowing for fine-tuning of stroke limits without complete disassembly.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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