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Pipe Threading

what is the difference between plumbing pipe threads and conduit threads?

plumbing and conduit are threaded with the same type of pipe threader, on a 3/4" per foot taper. I own the older type of threader, where you have to do all the threading by hand, but they make a threading machine that takes alot of the old cranking out of hand-threading field- cut pipe.
Conduit and plumbing pipe made in the factory are threaded to the same specs. I'm a heating and air conditioning mechanic, used to doing work in plumbing and electrical simultaneously- and i have been known to use the occasional 1/2" or 3/4" plumbing fitting to join two electrical boxes together in the past.
The most common threading machine in the states is made by rigid, I have attached a link to their site

p.s. I didn't mean to cause a big stir by putting the word "taper" in the definition. The real truth- is that if you thread conduit- it tapers. You just can't see the taper as much because standard practice is to stop short of threading by one thread. Think about it- you put threads on the pipe by REMOVING material. Each turn of the cutting head going deeper into the pipe. REMOVING MATERIAL tapers the pipe.
Store bought compression couplings are not tapered- but they do this so that they work with straight-cut unthreaded pipe.

Secondly- you really shouldn't use plumbing fittings in electrical systems- the burs on steel pipe are much more difficult to remove than those on softer metal conduit- so it can nick wires.

Find Pipe Threading On eBay Below:

Ridgid Manual Threading Pipe And Bolt Dies Only 37960
Ridgid Manual Threading Pipe And Bolt Dies Only 37960
$68.96
RIDGID 1224 PIPE THREADING DIES 2 1 2 TO 4 SUPER CLEAN
RIDGID 1224 PIPE THREADING DIES 2 1 2 TO 4 SUPER CLEAN
$188.88
7991 1 2 1 power pipe threader threading machine and self oiling die head
7991 1 2 1 power pipe threader threading machine and self oiling die head
$720.49
7991 1 2 1 power pipe threader threading machine and self oiling die head
7991 1 2 1 power pipe threader threading machine and self oiling die head
$720.49
RIDGID RIGID 12 R PIPE THREAD TOOL w 3 4 THREADING DIE IN GREAT COND
RIDGID RIGID 12 R PIPE THREAD TOOL w 3 4 THREADING DIE IN GREAT COND
$59.99
3 8 150 TC 304 THREADED PIPE CAP NEW 146957
3 8 150 TC 304 THREADED PIPE CAP NEW 146957
$9.89
Right Angle Beam Clamp 1 1 2 Nominal Conduit Pipe Threaded Rod Not Rated Jaw
Right Angle Beam Clamp 1 1 2 Nominal Conduit Pipe Threaded Rod Not Rated Jaw
$485.57
Beam Clamp 1 Nominal Conduit Pipe Threaded Rod 3 16 Jaw Opening 100 lb
Beam Clamp 1 Nominal Conduit Pipe Threaded Rod 3 16 Jaw Opening 100 lb
$128.71
Beam Clamp 2 1 2 Nominal Conduit Pipe Threaded Rod 1 5 16 Jaw Opening 600
Beam Clamp 2 1 2 Nominal Conduit Pipe Threaded Rod 1 5 16 Jaw Opening 600
$183.11
Sealey Pipe Threading Kit 3 8 2BSPT
Sealey Pipe Threading Kit 3 8 2BSPT
$232.05
Steel Dragon 7991 1 2in 1in Power Pipe Threader Threading Machine and Self Oili
Steel Dragon 7991 1 2in 1in Power Pipe Threader Threading Machine and Self Oili
$638.99
RIDGID 37845 1 1 2 NPT RH PIPE THREADING DIES
RIDGID 37845 1 1 2 NPT RH PIPE THREADING DIES
$25.00
Manual Threading Pipe And Bolt Dies Only RIDGID 37960
Manual Threading Pipe And Bolt Dies Only RIDGID 37960
$74.82
New 1 8 27 HSS NPT Taper Pipe Tap Machine Tap for Pipes Inner Threading Making
New 1 8 27 HSS NPT Taper Pipe Tap Machine Tap for Pipes Inner Threading Making
$5.44
Ridgid 47745 1 2 To 3 4 14 Npt RH Universal Alloy Steel Pipe Threading Dies
Ridgid 47745 1 2 To 3 4 14 Npt RH Universal Alloy Steel Pipe Threading Dies
$110.00
5A1 Ridgid No 820 Pipe Cutter for Ridgid 535 Pipe Threader Threading Machine
5A1 Ridgid No 820 Pipe Cutter for Ridgid 535 Pipe Threader Threading Machine
$100.00
GU3833 Silverline Pipe Threading Kit 13 19 25  32mm Plumbing DIY Tool
GU3833 Silverline Pipe Threading Kit 13 19 25 32mm Plumbing DIY Tool
$111.34
5A1 Ridgid No 820 Pipe Cutter for Ridgid 535 Pipe Threader Threading Machine
5A1 Ridgid No 820 Pipe Cutter for Ridgid 535 Pipe Threader Threading Machine
$99.95
GRAINGER APPROVED Black PipeThreaded1 1 2x60 In 90822GR
GRAINGER APPROVED Black PipeThreaded1 1 2x60 In 90822GR
$145.40
Aftermarket Hex Nipple Threaded Reducer Pipe Fitting Stainless Steel 1 4x1 8
Aftermarket Hex Nipple Threaded Reducer Pipe Fitting Stainless Steel 1 4x1 8
$5.00
RIDGID RIGID 12 R D 286 PIPE THREAD TOOL w 1 2 NPT THREADING DIE IN GREAT COND
RIDGID RIGID 12 R D 286 PIPE THREAD TOOL w 1 2 NPT THREADING DIE IN GREAT COND
$79.99
Sealey Pipe Threading Kit 1 4 1 1 4BSPT
Sealey Pipe Threading Kit 1 4 1 1 4BSPT
$223.12
The Ridge Tool CoPipe Threading Dies Size 12R Lot of 3 3 4 1 1 2 2 40779WVS
The Ridge Tool CoPipe Threading Dies Size 12R Lot of 3 3 4 1 1 2 2 40779WVS
$200.00
The Ridge Tool CoPipe Threading Dies Size 12R Lot of 2 1 1 2 2 40780WVS
The Ridge Tool CoPipe Threading Dies Size 12R Lot of 2 1 1 2 2 40780WVS
$150.00
The Ridge Tool CoPipe Threading Dies Size 00 RB Lot of 2 1 1 8 40781WVS
The Ridge Tool CoPipe Threading Dies Size 00 RB Lot of 2 1 1 8 40781WVS
$125.00
44185 Cutting Wheel for Model 360 Cutter fits RIDGID 360 Pipe Threading Machine
44185 Cutting Wheel for Model 360 Cutter fits RIDGID 360 Pipe Threading Machine
$11.79
BERKLEY BT 00023 Ridgid Manual Threading Pipe And Bolt Dies Only 37960
BERKLEY BT 00023 Ridgid Manual Threading Pipe And Bolt Dies Only 37960
$30.52
Sealey Pipe Threading Kit 1 2 1 1 4BSPT
Sealey Pipe Threading Kit 1 2 1 1 4BSPT
$113.39
Toledo Vintage Pipe Threading Threader 1 1 4 NPT Die Head Tool
Toledo Vintage Pipe Threading Threader 1 1 4 NPT Die Head Tool
$35.99
Vintage Hand Pipe Threading Threader Tool Detroit Rare Antique Early 1900s
Vintage Hand Pipe Threading Threader Tool Detroit Rare Antique Early 1900s
$44.99
Steel Dragon Tools 59832 811A Die Head Post fits RIDGID 300 535 Pipe Threading
Steel Dragon Tools 59832 811A Die Head Post fits RIDGID 300 535 Pipe Threading
$19.99
Steel Dragon Tools 59832 811A Die Head Post fits RIDGID 300 535 Pipe Threading
Steel Dragon Tools 59832 811A Die Head Post fits RIDGID 300 535 Pipe Threading
$19.99
Ridgid 820 Pipe Cutter for 535 Pipe Threader Machine Threading
Ridgid 820 Pipe Cutter for 535 Pipe Threader Machine Threading
$85.00
Ridgid Manual Threading Pipe and Bolt Die Heads Complete w Dies 37525
Ridgid Manual Threading Pipe and Bolt Die Heads Complete w Dies 37525
$121.75
RIDGID PIPE CUTTER for THREADING MACHINE PLUMBING TOOL No 820 w NEW CUT WHEEL
RIDGID PIPE CUTTER for THREADING MACHINE PLUMBING TOOL No 820 w NEW CUT WHEEL
$110.00
Ridgid Model 300 Complete Pipe Threading Machine 115v 15682
Ridgid Model 300 Complete Pipe Threading Machine 115v 15682
$4,969.32
Ridgid Manual Threading Pipe And Bolt Die Heads Complete W Dies 37105
Ridgid Manual Threading Pipe And Bolt Die Heads Complete W Dies 37105
$123.89


Recently Purchased Pipe Threading:


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