Fastener Head Marking 2

[ScottishMet]

Does anybody recognise the manufactures marking "LM" on the head of a fastener - image attached

 

[metengr]

Review this thread;

Note the second part of the post by CoryPad.

thread725-204833

 

[ScottishMet]

I looked through the MIL document before I posted and the marking was not clearly identified. There is an "LM" shown for Levingstom Machine Company, Haltom City, Texas but the shape of the lettering is different.

 

[desertfox]

hi ScottishMet

Have a look at this site I think its a meduim carbon quenched and tempered bolt and LM is the manufacturer's
intials whoever they might be.

http://www.unified-eng.com/scitech/bolt/boltmarks.html

regards

desertfox

 

[Billybaru]

The marking of 3 radial lines indicates a Grade 5 bolt (SAE J429 Grade 5). Based on information I have, the "LM" mark likely belongs to a factory in China by the name of Ningbo Haixin Hardware.

 

[ScottishMet]

Billybaru - Do Ningbo Haixin use a number of head-stamps? I thought their marking was "HX".

 

[CoryPad]

Confirm LM is used by Ningbo Haixin. In addition to the military document, the US Patent and Trademark Office has a document. It is available here:

http://www.uspto.gov/web/offices/tac/fqa/fqa.htm

Regards,

Cory

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