Product Overview
Swagelok SS-400-1-6 Stainless Male Connector, 1/4 in. Tube OD to 3/8 in. Male NPT
Condition
New. The photo shows the fitting still inside its original Swagelok poly bag, the printed one with the blue banding, the "Your Local Sales and Service Representative" line and the fill-in panel headed Number of Pieces and Part Number, with a handwritten notation in black marker across the label area. A blue plastic protective cap is still fitted over one end and the nut is in place on the fitting body. Where the stainless is visible it is bright, with no discoloration and no wrench marks on the hex flats. The bag shows a small opening along one edge; the fitting inside sits undisturbed with its cap on.
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Product Overview
The SS-400-1-6 is a Swagelok tube fitting male connector in stainless steel: a 1/4 in. tube OD compression end on one side, a 3/8 in. male NPT pipe thread on the other. It is the piece that takes a 1/4 in. instrument line and lands it in a 3/8 in. tapped port on a gauge, transmitter, valve body or manifold block. Swagelok's numbering reads straight across the part, 400 for the 1/4 in. tube size, 1 for the male connector shape and 6 for the 3/8 in. pipe size, with the SS prefix marking the stainless line. In the photograph the hex flats carry faint factory stamping that is not legible at this angle, so the SS-400-1-6 part number is the identification of record here. Specific alloy grade, pressure rating and temperature rating are not confirmed on this unit - verify against Swagelok catalog data for SS-400-1-6 before use.
Key Features
- Manufacturer part number: Swagelok SS-400-1-6
- Type: tube fitting male connector, tube end to male pipe thread
- Tube end: 1/4 in. tube OD
- Pipe end: 3/8 in. male NPT
- Material: stainless steel, Swagelok SS line; specific alloy grade not confirmed
- Nut visible in place on the fitting body in the photo
- Packaging: original Swagelok poly bag, blue plastic protective cap still fitted over one end
- Condition: New
- Quantity available: one
- Pressure and temperature ratings: not confirmed - verify against Swagelok catalog data before use
Applications
- Instrumentation technician landing a 1/4 in. stainless impulse line into the 3/8 in. tapped port on a pressure transmitter
- Lab builder running a stainless gas line from a panel to a regulator or analyzer inlet
- Maintenance mechanic replacing one weeping connector on a sample conditioning skid without ordering a full box
- Test stand or prototype builder who needs a single stainless tube-to-NPT transition to finish a rig
Frequently Asked Questions
What do the numbers in SS-400-1-6 mean?
They match what the fitting is: SS for the stainless line, 400 for the 1/4 in. tube OD end, 1 for the male connector body style and 6 for the 3/8 in. male NPT thread. That is exactly the fitting described here.
Does it come with the nut and ferrules?
The nut is visible in place on the fitting body in the photo. The ferrules sit inside the assembled nut and cannot be seen in this image, so we cannot confirm them. If your job depends on having the front and back ferrules present, plan to check the fitting on arrival before you make up the joint.
What pressure and temperature can it handle, and what stainless alloy is it?
Not confirmed. Nothing on the bag or the visible hex flats states a rating or an alloy grade in this photo, and we do not guess at those. Look up SS-400-1-6 in Swagelok's published catalog data and match it to your service conditions before you install it.
Are the NPT threads and the tube end in good shape?
The tube end and nut look clean and bright in the photo, with no wrench marks on the hex. The other end is under its blue protective cap and was not uncapped for the photograph, so it has not been inspected in the image. The cap being on is a good sign that the threads have never been made up.
There is only one of these on the shelf. Why buy a single fitting here instead of chasing a surplus lot?
Because this is one known piece, photographed as it sits, with the part number, the condition and the packaging all stated up front. A surplus lot or an auction pallet of fittings is a guess: mixed sizes, mixed materials, unknown history, and you still have to sort it to find the one 1/4 in. tube OD to 3/8 in. male NPT connector you actually needed. Here you buy that one fitting and nothing else. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Swagelok built its name on the joint nobody thinks about until the day it weeps. This one is still bagged and capped, waiting for the one port on your panel that never got finished.
