The RIDGID 37385 die head brings precision hand-threading to 3/8-inch NPT pipe. Designed for the RIDGID 12R ratchet threader, this die head is factory-set with a hardened alloy die, so it's ready to use right out of the box. Its compact size makes it ideal for close quarters and maintenance work.
RIDGID 37385 Die Head Overview
This die head cuts right-hand NPT threads on 3/8-inch pipe. It is fully compatible with the RIDGID 12R hand ratchet, allowing you to thread pipe in tight spaces where a power threader can't fit.
Replacement Dies for RIDGID 37385
To keep your die head producing clean threads, replace the die when it becomes dull or damaged. Genuine RIDGID dies (e.g., 37385-compatible 3/8-inch NPT dies) are available, or you can match the die size and orientation.
Threading 3/8-Inch Pipe: Tips
Clean the pipe end and apply cutting oil before threading. Start straight and rotate the ratchet smoothly, using steady pressure. Back the head off occasionally to clear chips. Always check the thread length against specifications.
Features
Complete die head: Includes alloy die, factory set for immediate use.
3/8-inch NPT capacity: Ideal for small pipe threading jobs.
Fits RIDGID 12R threader: Dependable fit for manual ratchet operations.
Right-hand thread: Standard NPT orientation.
Hand: Right
Model: 37385
Weight: 2 lb / 0.9 kg
Material: Alloy
Thread Size: 3/8 in NPT
Product Type: Die Head
Compatibility: RIDGID 12R Ratchet Threader
Seller: Workbench World
MPN: 37385
Product Details
Hand Threading vs. Power Threading
Hand ratchet threading is slower than power threaders, but it gives you maximum control and portability. It's ideal for small-diameter pipes and tight spaces where a threaded machine can't reach. Use the correct die head and ratchet size for the pipe.
How to Maintain Die Heads
Keep dies sharp by cleaning them with a brass wire brush and using cutting oil consistently. Store the head in a dry, padded box to avoid damage. Check the die alignment every few uses to ensure even thread cutting.
Thread Size Guide
3/8-inch NPT is a common size for small valves, nipples, and compressor fittings. Always match the die head exactly to the nominal pipe size and thread standard. Using the wrong die will ruin the thread.
Frequently Asked Questions
Does the 37385 include the die?
Yes, it comes with a complete alloy die installed.
Can I use this die head on other RIDGID threaders?
It is specifically designed for the 12R ratchet; check compatibility with other models.
Where can I find replacement dies?
Search for RIDGID 37185 or compatible 3/8-inch NPT dies for the 12R.
What is the difference between right-hand and left-hand dies?
Right-hand dies cut standard clockwise threads; left-hand dies cut counter-clockwise threads.
4.5★★★★★★★★★★(4)
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Customer Reviews
4
★★★★★★★★★★5.0
Marlene D.
Verified
Perfect fit
Fits perfectly.
★★★★★★★★★★4.0
Corey
Verified
Good die head
This is a good die head for 3/8 NPT. It cuts threads easily. The ratchet threader is more work than a power threader, but this works.
★★★★★★★★★★5.0
myron_metal
Verified
Durable
I've used RIDGID tools for decades. This die head is exactly as expected. The alloy die is durable. It threaded galvanized pipe smoothly. The head is nice and compact. If you have a 12R, this is a no-brainer.