Better Design. Best Fit.

The Swagelok Tube Fitting Advantage delivers unmatched value through innovative design, performance and reliability. No other tube fitting manufacturer offers the unique features and engineering advancements highlighted across Swagelok's product line.

Swagelok's truly robust tube fitting design delivers maximum reliability by excelling in three critical areas:

1. Secure Tube Grip

Swagelok's mechanical grip-type fitting uses a patented hinging and colleting action to achieve superior tube grip. 

Key Advantages: 

• Non-biting, robust grip:
  The back ferrule's unique geometry and hinging action delivers a strong colleting squeeze onto the tube and provides direct axial support adjacent to the tube grip. This ensures a more robust and reliable connection over a wide range of installation conditions — even under maximum working pressure.
• Reduced risk of tube damage: 
  The design avoids creating sharp stress risers or indents, thus minimising the risk of tube fractures and preventing pullout during overpressure or improper handling. 
• Enhanced sealing performance: 
  The hinging action advances and seals the front ferrule predictably and accurately, even on hard tubing materials. It also delivers more swaging energy earlier in the pull-up process, helping ensure a gas-tight seal — even in less-than-ideal installation scenarios
• Over-tightening protection:
  Even when connections are severely over-tightened, the ferrule will not bite through the tubing. The hinging and colleting action absorbs excess torque, preventing overdriving and helping maintain sealing integrity during initial installation and remakes 
• Installation benefits:

1. Maintains a predictable and manageable installation torque 
2. Reduces potential for improper installation and leakage 
3. Enhances system reliability across diverse operating conditions 

Swagelok tube fittings are engineered to grip and seal under demanding conditions, offering advanced protection for your fluid system without the drawbacks of traditional bite-type designs

2. Leak-Tight Gas Seal 

The burnishing or polishing action of the front ferrule plays a key role in achieving a strong, reliable gas seal. During installation, this action creates concentrated zones of contact between the front ferrule and both the tubing and the body bevel — enhancing the integrity of the seal. 

Swagelok's tube fitting design further improves sealing performance through its engineered back ferrule, which features a hinging action that delivers steady, consistent force to the front ferrule. This advanced geometry: 

• Promotes a strong and uniform gas seal across a wide range of tubing types and hardness levels. 
• Reduces the risk of overdriving the front ferrule — especially during remakes — by absorbing more energy than conventional back ferrules
• Ensures reliable sealing performance, even after multiple installations and reconnections 

The result is a tube fitting that maintains gas-tight integrity and operational reliability, even under demanding conditions. 

3. Vibration Resistance

Traditional bite-type fittings provide minimal contact and support behind the tube grip, offering limited resistance to these dynamic loads. In contrast, Swagelok's advanced tube fitting design features a patented hinging and colleting back ferrule that directs more material into close contact with the tubing adjacent to the tube grip. 

Key benefits: 

• Isolates and protects stress risers:
   The colleting region supports the tubing more effectively behind the grip point, mitigating the effects of vibration and preventing damage at the stress riser
• Reduces the risk of pullout or fracture: 
  By reinforcing the tubing where stresses are most likely to concentrate, the fitting resists fatigue and extends the life of the tubing in high vibration environments 
• Proven performance under extreme conditions:
   In rotary flex vibration tests, Swagelok's fittings consistently demonstrate their robustness. Test samples show fractures occurring away from the stress riser, proving that the colleting design preserves the integrity  of the swaged area.
• Engineered for endurance: 
  The back ferrule's hinging action delivers a consistent radial colleting force, ensuring the tubing is well supported and resilient to dynamic loading.
• Unmatched durability: 
  During high-pressure vibration testing, Swagelok tube fittings have remained intact and fully operational, outperforming conventional designs that failed under similar conditions. 

As part of rigorous in-house testing, Swagelok simulates extreme vibration scenarios using custom equipment that applies millions of alternating stress cycles. These tests confirm that Swagelok fittings deliver unsurpassed reliability and safety where vibration resistance is critical.