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What does "HR screw HM20" mean?

November 1, 2012

Q. I have a requirement for the following HR screw HM20 length 80mm, zinc plated, can you tell me what the HR and HM stand for please?

Richie Gordon
- Singapore

March 1, 2013

A. I think you will find this refers to a British Standard for pre-stressed bolts "HR" and that the bolts are to be hot-manufactured and 20 mm dia.

Kent Backus
Fort Worth, Texas, USA

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