RETAINING RING TYPE - A

🔩 A-Type Retaining Rings (External Circlips) | Neo Fasteners

A-Type Retaining Rings, also known as External Circlips, are axially installed fasteners designed to fit into a machined groove on the outside of a shaft. These rings prevent components such as gears, bearings, or pulleys from sliding along the shaft while allowing rotation.

At Neo Fasteners, we manufacture and supply high-performance External Circlips in Stainless Steel (SS), Mild Steel (MS), High Tensile (HT) Steel, Brass, and other industrial-grade materials in compliance with global standards.

📌 1. Standard External Circlip (A-Type)

• Fits onto a shaft groove to retain components
  
  

• Has two lugs with holes for installation/removal using circlip pliers
  
  

• Standards:
  
  

  • DIN 471
    
    

  • IS 3075 (Part 1)
    
    

  • ISO 8752 / ANSI B27.7
    
    

• Common Size Range: 3 mm to 300 mm shaft diameter
  
  

• Materials:
  
  

  • SS 304 / SS 316
    
    

  • Carbon Spring Steel (hardened)
    
    

  • Brass / Phosphor Bronze (on request)
    
    

📌 2. Heavy-Duty External Circlip

• Thicker cross-section for higher load-bearing capacity
  
  

• Used in industrial gearboxes, truck axles, cranes, and high-torque machinery
  
  

• Suitable for high-vibration and dynamic load environments
  
  

📌 3. External Circlip with Lug Notches

• Includes small notches near the lugs for better plier grip
  
  

• Makes removal and installation easier in tight assemblies
  
  

• Often used in automation or robotic arms
  
  

📌 4. Constant Section External Retaining Ring

• Uniform cross-section along the full circumference
  
  

• Ensures even load distribution and better performance under rotational stress
  
  

• Used In: Aerospace, medical equipment, instrumentation
  
  

📌 5. Spiral External Retaining Ring

• Made from flat wire wound in a spiral shape
  
  

• Provides 360° groove contact and no lug interference
  
  

• Best For: High-speed rotating parts and precision assemblies
  
  

📌 6. Laminar Ring (Multi-Layered External Circlip)

• Formed by stacking several thin rings
  
  

• Offers custom preload or thickness
  
  

• Ideal for heavy-duty applications like turbines, wind energy, and motors
  
  

📌 7. Custom / Non-Standard A-Type Circlips

• Non-standard shapes, thicknesses, or materials as per OEM drawings
  
  

• Includes circlips with modified lugs, extra shoulders, special coatings, etc.
  
  

📐 Standard Dimensions (DIN 471 Examples):

Shaft Dia (mm)

Groove Dia (mm)

Ring Thickness (s)

Ring Width (b)

3

2.7

0.4

0.6

10

9.5

0.6

1.0

50

48.8

1.75

3.0

Up to 300 mm

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...

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Custom tolerances available on request.

🧰 Applications:

• Automotive axles, transmission shafts
  
  

• Electric motors and pumps
  
  

• Agricultural and heavy machinery
  
  

• Bearing housings, pulleys, and industrial rollers
  
  

• Aerospace, defense, and railway equipment
  
  

🌟 Neo Fasteners Retaining Ring Features:

• Manufactured to ISO 9001:2015 quality standards
  
  

• RoHS Compliant – Free of hazardous substances
  
  

• Available in:
  
  

  • Black Oxide, Zinc Plated, Phosphate, Nickel, Passivated SS
    
    

• Supplied in bulk packs, kits, or custom OEM-labeled formats