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  • Users: unp1
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  1. unp1

    UNJ & UNS thread and gage

    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...
  2. unp1

    Question about test block for ASTM E18

    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...
  3. unp1

    1/4 Hard CRS v/s Heat treated CRS

    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.
  4. unp1

    1/4 Hard CRS mechanical properties

    Hi, I am looking for mechanical properties of 1/4 hard cold rolled steel. Please help me. Thanks.
  5. unp1

    RAWSTOCK: STRESSPROOF ????

    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.
  6. unp1

    96 DP Straight Knurl

    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.
  7. unp1

    Looking for rework source for waxed screws

    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...
  8. unp1

    Zinc plating spec too tight

    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.
  9. unp1

    What is exactly CFS?

    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...
  10. unp1

    Need info about JOHNSON'S WAX

    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...
  11. unp1

    AISI 1144 Hardness Problem

    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...
  12. unp1

    What is Bright dip finish for 360 brass?

    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.
  13. unp1

    What is hardenability curve?

    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.
  14. unp1

    Mechanical Properties of O1 Drill Rod??

    Hi Friends, Does anyone know Mechanical properties of O1 Drill Rod material? Thanks.
  15. unp1

    Optical Comparator doesn't work

    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.
  16. unp1

    Looking for easy to understand Metal source

    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...
  17. unp1

    Does "Drawn-Over-Mandrel Tube" mean SEAMLESS TUBE?

    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.
  18. unp1

    What is 6 sigma in plain language?

    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...
  19. unp1

    Need reference for Chinese & Japanese material properties

    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...
  20. unp1

    CHINESE equivalent of C36000 BRASS?

    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.

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