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Dear Forum Members, * We have Al die casting parts with "4 11/16 - 8 UNJ-2A" external threads. We have "4 11/16 - 8 UNS-2A" go / nogo gages and want to know if these gages would give us correct results. * I found on the web that a UNS nut won't fit on a UNJ external thread (due to external...

Recently I got my Rockwell hardness testing machine calibrated. The guy from the calibration service told me that ASTM E18 is a new standard for this test and I will have to buy new B-scale tungsten balls and appropriate test block for the future use. Could anyone please tell me what exactly do...

We have some parts that require 1/4 Hard CRS. We are currently developing these parts in China. Our Chinese vendor is asking us if he can use HEAT TREATED CRS that has the same hardness as of 1/4 HARD CRS. Is there any difference between these two? Thanks.

Hi, I am looking for mechanical properties of 1/4 hard cold rolled steel. Please help me. Thanks.

Material for a screw machine part is mentioned as “RAWSTOCK: STRESSPROOF” on the drawing. Does anyone know what this material is? What are the chemical and mechanical properties? Thanks.

I have a new part which has 96 DP Straight Knurl. The diameter before knurl is .187 +/- .005 and diameter after knurling is .200-.203. To calculate the # of knurls required which diameter shell I consider, before knurl or after knurl diameter? Thanks.

We have rejected Aluminum screws. The screws were waxed for lubrication, but the wax was too much dry and caused problem in the assembly. I am looking for a reworking source. Could any one please provide me reworking source info for this type of work? This is the first time we have such a...

Plating spec for a screw machine part is .00025-.00040 zinc & yellow chromate. Is this too tight spec? Our maker in China has difficulty in meeting the spec. They are saying that it is too tight. Is it true? Thanks.

Could any one please tell me what is CFS? I submitted a PPAP for a screw machine part and the customer rejected it. The reason for rejection is, the material on the drawing is CFS and I used 12L14. They are saying that material cert doezn't match the spec. I think CFS is a very broad range and...

Hi All, I am looking for information on JOHNSON’S WAX. I am trying to find it on the web, but haven’t found any good source yet. I have a new customer who is heavily involved in the electrical field. I have two Aluminum cable set screws for them; both require JOHNSON’S WAX # W5051 treatment...

Hi Friends, I have a screw machine part drawing and it is a new part for us. The material is 1144 Steel and required hardness is RC 30 min. The drawing doesn't mention anything about heat treatment process. I checked few sources and couldn't find this material having RC 30 min hardness. The...

Hi friends, Finish spec for a 360 brass part is mentioned as BRIGHT DIP on the drawing. Is it like PLATING or CHROMATE DIP? OR it is something else? Thanks.

Hi friends, What is hardenability curve? Recently I came across this term and don’t know anything about it. I am looking for hardenability curves for different grades of stainless steel. Where can I find this information? Could anyone please help me? Thanks.

Hi Friends, Does anyone know Mechanical properties of O1 Drill Rod material? Thanks.

Hi Friends, I have a Deltronic DH 214 optical comparator. All of a sudden, its joystick stops working today. All the three motors are not responding. All the lamps and display screen are getting power though. Does any one know a repair firm near Chicago who can fix this problem? Thanks.

Hi Friends, I have Mechanical Engineering background and have basic knowledge of Metallurgy, only up to academic level which I learnt a long time ago. I am working for a company (it is relatively a new job in this new field for me) dealing with parts made from ferrous and non-ferrous metals. I...

Hi All, I have a drawing for three parts having OD ranging from .750” to 1.125”. For the material, a note says “AISI 1020, Drawn-Over-Mandrel Tube.” Does this mean SEAMLESS TUBE? My guess is yes, but still confused. Could any one please help me? Thank you.

Hi all, What is 6-sigma? I am a CQT, have attended ASQ classes on SPC-I & SPC-II and have some basic knowledge of 6-sigma. My employer knows how to do business, but doesn’t understand technical things. Today he asked me what 6-sigma is, and I couldn't answer him in a language that he can...

Hi all, I am looking for references where I can find Chinese and Japanese equivalent metal for any US metal specification. I am interested in references which provide me chemical composition as well as their mechanical & electrical properties of Asian specifications. I desperately need it and...

Does anyone know Chinese equivalent of C36000 Brass? Is it HPb60-2? Could anyone please refer me a good reference (link or reference book) where I can find Chinese equivalent material and properties (mechanical, electrical) of that material? Thank you.