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Four high speed steel pipe thread dies for half inch NPT threads

Ridgid

Ridgid 37870 1/2 in NPT pipe thread die 4 pc HSS

SKU CH-G5K7-0GKM3 MPN 37870

High-speed steel die set cuts 1/2-inch NPT threads on aluminum, galvanized steel, or steel pipe using Ridgid handheld threaders

  • Product typeDrain Components
  • Compatible with 1/2 in NPT pipe for standard threading
  • High-speed steel dies resist wear for longer service life
  • Four-piece set covers complete thread cutting in one kit
  • Works with Ridgid handheld manual and power threaders
  • Fits die heads 0-R, 00-R, 11-R, 12-R, 30A, 31A

1/2 in NPT pipe thread die set

The Ridgid 37870 set contains four high-speed steel dies for cutting right-hand NPT threads on 1/2 in pipe. It fits Ridgid handheld manual and power threaders using 0-R, 00-R, 11-R, 12-R, 30A or 31A die heads. The dies handle aluminium, galvanised steel and steel pipe.

Replaces worn dies in compatible Ridgid heads

Swap out dull or damaged dies in the listed Ridgid die heads to restore clean thread cutting. The upgrade is worth it when existing dies leave rough threads or bind in aluminium, galvanised steel or steel pipe. The 14 threads-per-inch pitch matches standard NPT requirements for 1/2 in pipe.

Four dies cover one nominal size and pitch

The set provides the complete die complement for 1/2 in NPT at 14 threads per inch. It comfortably handles occasional to regular threading jobs in the specified materials. It runs out when the pipe diameter differs from 1/2 in or when a thread standard other than NPT is required.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $49.99
Pricier than about 62% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameRidgid
Model name37870
Product typeDrain Components

Questions about this item

Which Ridgid die heads accept the 37870 1/2 in NPT die set?

The dies fit Ridgid handheld die heads with manufacturer part numbers 0-R, 00-R, 11-R, 12-R, 30A and 31A.

What is the correct sequence for installing the four high-speed-steel dies into the die head?

Match each die to its numbered slot in the head, seat them fully so the cutting faces align, then tighten the retaining screws evenly — skipping the numbered order leaves threads uneven.

When should the four high-speed-steel dies be replaced?

Replace the set when threads show tearing, require excessive force or the cutting edges display visible nicks or rounding.

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