PennEngineering - Tube Bushings

High strength, threaded fastener designed for aluminum extrusions

High strength, threaded fastener for aluminum tubing

Designed with a double clinch feature on both ends, TBA™ and TBFA™ (flange style) fasteners firmly lock into place in the aluminum tube during installation.

Designed for square or rectangular aluminum tubing
Connects two sides of the tubing
High strength thread (meets Class 10 proof load requirements when the effective thread depth is greater than 1.5 times the major diameter), and high torque resistance
Improve the strength and Noise, Vibration, and Hardness (NVH) performance
Installs into round holes

This datasheet showcases custom-designed parts developed for square and rectangular aluminum tubing. Samples of these solutions are available from stock.

The datasheet illustrates PennEngineering’s expertise in creating strong, reliable threads in tubing applications. Since dimensions may vary with tube size and wall thickness, our engineering team can help tailor the design to your specific needs. Contact us to explore the best solution for your application.

Note: Additional sizes available on special order. Contact us for availability.

Unit of Measure

Items	TBA-M6-30-170 Tube Bushings	TBA-M8-25-120 Tube Bushings	TBA-M10-25-270 Tube Bushings	TBFA-M6-20-105 Tube Bushings	TBFA-M8-25-250 Tube Bushings
Thread Size x Pitch	N/A M6 x 1.0	N/A M8 x 1.25	N/A M10 x 1.50	N/A M6 x 1.0	N/A M8 x 1.25
Optional Styles¹	N/A #1
Type	N/A TB	N/A TB	N/A TB	N/A TBF	N/A TBF
Fastener Material	N/A 7000 Series Aluminum
Thread Code	N/A M6	N/A M8	N/A M10	N/A M6	N/A M8
Shank Code	N/A 30	N/A 25	N/A 25	N/A 20	N/A 25
Length Code	N/A 170	N/A 120	N/A 270	N/A 105	N/A 250
A Max.	N/A 3.00 mm	N/A 2.50 mm	N/A 2.50 mm	N/A 2.00 mm	N/A 2.50 mm
B Max.	N/A 12.00 mm	N/A 14.50 mm	N/A 21.50 mm	N/A 12.00 mm	N/A 16.00 mm
TOL_B	N/A Max.
C Max.	N/A 9.00 mm	N/A 11.00 mm	N/A 15.00 mm	N/A 9.00 mm	N/A 11.00 mm
E ± .5	N/A	N/A	N/A	N/A 14.50 mm	N/A 18.50 mm
TOL_E	N/A	N/A	N/A	N/A 0.50 mm	N/A 0.50 mm
F± .25	N/A	N/A	N/A	N/A 2.00 mm	N/A 3.00 mm
TOL_F	N/A	N/A	N/A	N/A 0.25 mm	N/A 0.25 mm
TOL_L	N/A Ref.
Thickness T1 Min.	N/A 3.00 mm	N/A 2.50 mm	N/A 2.50 mm	N/A 2.00 mm	N/A 2.50 mm
TOL_T1	N/A Min.
Thickness T2 Min.	N/A 3.00 mm	N/A 2.50 mm	N/A 2.50 mm	N/A 2.00 mm	N/A 2.50 mm
TOL_T2	N/A Min.
Hole Size D1 +0.1mm	N/A 9.00 mm	N/A 11.00 mm	N/A 15.00 mm	N/A 9.00 mm	N/A 11.00 mm
TOL_D1	N/A 0.10
Hole Size D2 +0.1mm	N/A 12.00 mm	N/A 14.50 mm	N/A 21.50 mm	N/A 12.00 mm	N/A 16.00 mm
TOL_D2	N/A 0.10
Overall Height H Ref.	N/A 17.00 mm	N/A 12.00 mm	N/A 27.00 mm	N/A 10.50 mm	N/A 25.00 mm
TOL_H	N/A Ref.
Standard Finish	N/A No Finish, (Plain)
For Use in Sheet Hardness²	N/A HRB 55 / HB 96 or less
Thread Specification	N/A Internal, ASME B1.1, 2B /ASME B1.13M, 6H
Min. Sheet Thickness	N/A
TOL_Hole SizeH	N/A
TOL_Hole SizeD	N/A
CAD Supplier	N/A PennEngineering® (PEM®)
¹ Style #1 - Thru-threaded. Style #2 - Screw might not pass through unthreaded end. Tapped to minimum full thread depth shown. Incomplete threads on tap may allow screw to pass through. Style #3 - Blind threaded hole. ² HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.