Jensen Hollow Steam Screw

• Jensen Hollow Steam Screw
  Posted by D E Jones on 07 May, 2022 17:53
•   What size is the Jensen hollow steam screw ?  ( thread pitch and diameter )
  
  D. E. Jones
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• #1 Reply
  Posted by Weedensteam on 08 May, 2022 00:00
• According to a chart I downloaded from one of the forums it is #12-32 TPI.
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• #2 Reply
  Posted by D E Jones on 08 May, 2022 13:54
• Thanks , I was pretty sure that they were 32 pitch, but unsure of the diameter.  That is certainly an unusual size.
  
  D E Jones
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• #3 Reply
  Posted by krypto31337 on 08 May, 2022 18:07
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  I was down at the shop today and can confirm that the Jensen hollow steam screw is indeed #12-32.
  
  While I would be surprised if the tattooed lady at your local hardware store would be able to provide a tap or die for #12-32, the thread is "on the charts" and it would be easy to acquire the tooling at a good industrial supplier.
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• #4 Reply
  Posted by Weedensteam on 14 May, 2022 17:46
• Check Ebay, there are both a tap and a die offered very reasonable and probably okay for occasional use on brass.
  https://www.ebay.com/itm/175081991776?hash=item28c3b32e60:g:zG4AAOSwnVdfg~b-
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• #5 Reply
  Posted by komet163b on 15 May, 2022 10:02
• Frank....where can I get one of those bolt size/thread plates?
  
  Is there one for nuts?  I've seen their type in the big box
  hardware store, but not for sale.
  
  Wayne
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• #6 Reply
  Posted by Adirondack Jack on 15 May, 2022 11:32
• Machine shop supply such as MSC Industrial will have thread gauges.  Before internet, “Manhattan supply” published a hardcover catalog that probably weighed five pounds. If they didn’t stock it, a machinist didn’t need it.
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• #7 Reply
  Posted by krypto31337 on 15 May, 2022 13:06
• The Screw Checker shown in the picture is from PEC tools.
  
  https://pec.tools/product-category/gages/screw-checker-gages/
  
  They make really nice stuff and I also have a few of their square blades and rules.
  
  I seen a few different sets of those "bolts and nuts on a wire" on Ebay.
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