Recent content by ScottishMet

A quenched and tempered low alloy steel with a minimum hardness specification of 341-BHN would be generally expected to achieve a yield strength of 130,000-psi and an ultimate tensile strength of 160,000-psi. What percentage of samples tested could fall below the expected yield and ulimate values?

Take a look at AGMA 938-A05 for information on the use of Shot Peening on Gears.

The American Gear Manufacturers Association (AGMA)- of which H&S as a member - offers on-line training courses. http://www.agma.org/AM/Template.cfm?Section=Online_Education

The strength level quoted in the Engineering Fracture Mechanics 72 (2008) 1148-1170 is very high and consequently the toughness lower than normal. Core strength properties of 9310 material which has been through a carburize cycle are more typically UTS 140 - 150 ksi, YS 100 - 125 ksi Fracture...

Take a look at BS 970 817M40 (En 24), it "might" make the properties you need.

Is there a reasonably close US equivalent to DIN C60N?

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

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.

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