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Type 72 - Stair Tread Support
72.jpg (18055 bytes)
 

Nominal Pipe Size

    

inches

        

Bolt Hole

lbs

Type

A

B

C

D

E

F

G

H

Diameter

72-8

11/2"

7.99

1.30

2.01

5.98

0.75

0.43

2.76

 

Type 72 is a stair tread support suitable for most types of stair tread, including timber, open steel, and checker plate. Fixing of the treads is by two bolt holes in each fitting. If Type 72 fittings are to be used for a permanent application or subjected to high loads, the stair tread support tube which is located at its ends with a single grub screw, should be drilled and pinned to avoid rotational slip.