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  • Users: unp1
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  1. unp1

    UNJ & UNS thread and gage

    I appreciate all responses. Thanks, unp
  2. unp1

    UNJ & UNS thread and gage

    Hi desertfox, I appreciate your response. I checked the link but could not find detailed that I am looking for. I am looking for the thread profile and dimension info. Does anyone think I might find this info in Machinery's Handbook? Thanks, unp
  3. 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...
  4. unp1

    Question about test block for ASTM E18

    Thanks for all the responses that I received. From all these responses, I understood that it is not required to use NIST blocks for routine verifications; I will keep using my old block. unp1
  5. 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...
  6. unp1

    1/4 Hard CRS v/s Heat treated CRS

    Thanks for all your responses! Below is more info on this topic. This is a Cold Rolled Steel for a stamping part. The material spec on the drawing is, “.0897 +/- .002 thick C.R.S., 1/4 hard.” I don’t have much info (material properties) about the material that our Chinese vendor wants to use...
  7. 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.
  8. unp1

    1/4 Hard CRS mechanical properties

    unclesyd, Thanks for your help. I got the basic info that I was looking for. I am still willing to receive more info if someone can provide me. Thanks, unp1
  9. unp1

    1/4 Hard CRS mechanical properties

    TVP, This is a low carbon steel, 1/4 hard. unp1
  10. 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.
  11. 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.
  12. 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.
  13. unp1

    Looking for rework source for waxed screws

    Hi plasgears, Thanks for your post. But, the problem is, we are just a supplier and don't have any capacity of doing rework in-house. We get the products manufactured in Asia and deliver to our customers in JIT basis. In this case, our customer is facing the problem during assembly.
  14. 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...
  15. unp1

    Zinc plating spec too tight

    Hi limct and TVP, Thanks for your comments, I feel better now!
  16. unp1

    Zinc plating spec too tight

    Hi limct, My part is a very simple and small screw machine part. It is a new part, so I submitted a PPAP (ISIR) with 5 samples. The required spec is .00025"-.00040" thick zinc yellow chromate. My samples were .00032"-.00042" thick. The PPAP was rejected by our customer who is a large US based...
  17. unp1

    Zinc plating spec too tight

    Hi TVP, Yes, the values are in inches, but this part is not a threaded part. Thanks.
  18. 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.
  19. unp1

    Need info about JOHNSON'S WAX

    tomwalz, I called them, but no one there could answer my question. Where can I buy this type of wax? Does any one have any idea about it? I tried Grainger, Mcmaster and J&L Industrial, but can't find there. Thanks.
  20. 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...

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