Questions regading Metric U-Bolt designation

[John2004]

Hi everyone,

I have a metric U-bolt designation of M14 OD X 2 mm pitch X 60 mm long thread length and a 215 mm total length. There is a 79.5 mm center to center distance. The U-bolt is a 9.8 class, and it has a designation of "PX" after the class rating.

I was told the PX designation is the type of bolt, but does anyone know exactly what it means ? Does this simply tell that it is a U bolt, or does it mean something else ?

A 9.8 class somewhere between a grade 5 and a grade 8, right ?

Regarding the overall length of a U bolt, is this generally considered as dimension C as shown in the attached drawing, (end of threads to inside of flat portion) or is it generally considered from the end of the threads to the outside of the flat portion ? I only have written specs on the U-bolt, no drawing.

Thanks
John

 

[CoryPad]

The PX might be a symbol for the manufacturer. It may be a product descriptor from the manufacturer. I have never seen PX associated with a U-bolt.

According to SAE J1199, property class 9.8 has a tensile strength of 900 MPa and a hardness of 27 to 36 HRC. Compare this to a Grade 5 according to SAE J429 which has a tensile strength of 830 MPa (120 ksi) and a hardness range of 25 to 34 HRC.

The dimension C is the grip length plus the thread length, which is important for joint calculations.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[MintJulep]

The "PX" is likely the manufacturer's identification.

A class 9.8 M14x2 bolt should have a yield strength of 82.8 kN and an UTS of 104 kN,

 

[John2004]

Thanks for the feedback guys.

John