Products Fairloc^® - The Integral Fastener

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Fairloc® is the better way to fasten rotating components. It solves phasing, timing, positioning and frequent removal problems.

• Easy Adjustment Fairloc® replaces set screws and clamps; components can be repositioned with a single hex key adjustment.
• Will not Mar Shaft
• Outstanding Reliability
• Compact, Self-Contained Design When available space or access is
• limited Fairloc's® small hub envelope is a distinct advantage.
• Full Use of the Bore Gives maximum support to the component,
reduces wobble or misalignment.
• Superior to Other Fasteners in High-Torque Applications

Here’s how it Works
Two slots are machined into the hub; one oriented radially, the other angularly, to create a transverse wedge which remains attached to the solid portion of the hub on one side. The resultant cantilevered clamping section has a tapped hole to accept a cap screw which passes through a clearance hole in the solid portion of the hub, and into a threaded hole in the transverse wedge section. As the screw is tightened, the cantilevered section clamps the shaft securely. The screw can be tightened and released repeatedly without marring the shaft or affecting its torque transmitting abilities.

Proven Effectiveness
For precision application – Lab tests proved Fairloc® to be superior to all other comparable fasteners. For high-torque application – Torques up to 400 lbf/in are obtained with a 5/8" bore Fairloc® hub

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FAIRLOC® HUBS ARE USED IN CUSTOM DESIGNS:

Fastening Method	Shaft Remains Smooth	Self-Contained	Component is Fully Supported	Easy Adjustment	Can be Pinned if Desired
Clamps	YES	NO	NO	YES	NO
Fairloc ®	YES	YES	YES	YES	YES
Keys	NO	NO	NO	NO	NO
Pins	NO	NO	NO	NO	YES
Set Screws	NO	NO	NO	NO	YES

Our application engineers are available to assist you with any simple or complex design problems. We can offer solutions by matching the right component to your need, supplying value added services or a total design. We provide design, engineering and manufacturing services. We take pride in providing high-quality components, customer satisfaction, on-time delivery and being cost effective.

Typical Applications
Aerospace Components, Aircraft Instrumentation, Aircraft Fuel System Controls, Machine Tools, N/C Machines, Military Fire Control Systems, Medical Equipment, Business Machines, Optical Equipment, Robotic Systems, Power Drives.

FAIRLOC® TORQUE DATA:

Fairloc® is a component fastening system that is built into the hub of the part.

The relationship between the clamp screw fastening torque and the torque at which the component starts to slip on the shaft is shown in the graphs. These are typical values for Stainless Steel Gears mounted on Stainless Steel Shafts.

For best results, the space between the component bore and shaft O.D. should be controlled closely. In addition, lubricating the clamping screw with molybdenum disulfide grease will improve the clamping action.

CAUTION: Do Not Tighten Screws Without Shaft in the Bore. This will create a permanent set of wedge section which will prevent the shaft from going in.

**Hover images to enlarge**

Figure 1 – shows the torque at which the sample Fairloc® gears started to slip on the shaft.

All gears and shafts were made of 303 Stainless Steel. Gear bores were within +.0003 inch of nominal values. Shafts had surface finishes of 16 micro-inch maximum and were within. -.0002 inch of the nominal diameters.

Figure 2 – compares the slip torques for different values of the clamping screw fastening torques.

Figure 3 – shows the torque at which the sample Fairloc® gears started to slip on the shaft.

All gears and shafts were made of 303 Stainless Steel. Gear bores were within +0.0075 mm of nominal values. Shafts had surface finishes of 0.4µm maximum and were within. -0.005 mm of the nominal diameters.

Figure 4 – compares the slip torques for different values of the clamping screw fastening torques.

PRECISION FAIRLOC® HUBBED ANTI-BACKLASH GEARS:

AVAILABLE IN:

Material: Stainless Steel, Aluminum
Pitch: 48 - 120
Pressure Angle: 20°

PRECISION FAIRLOC® MINI-LASH GEARS:

AVAILABLE IN:

Material: Stainless Steel, Aluminum
Pitch: 64 - 120
Pressure Angle: 20°

PRECISION FAIRLOC® BEVEL GEARS:

AVAILABLE IN:

Material: Stainless Steel, Aluminum
Pitch: 48 - 72
Pressure Angle: 20°

These Precision Bevel Gear sets are supplied with a 1/4 bore and are AGMA 10 rated. Fairloc hubs require controlled shaft tolerances. Suggested clearance fit between the bore and the shaft is .0001/.0008. They are sold as a set. Socket head cap screw is supplied.