Boshart SS304B Stainless Steel...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.35
Boshart SS304B Stainless Steel Threaded Reducing Bushing, ISO4144

Boshart SS304B Stainless Steel Threaded Reducing Bushing, ISO4144

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Model: SS304B-0503

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1.35
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Boshart SS304B Stainless Steel Threaded Reducing Bushing, ISO4144

The Boshart SS304B is a reducing bushing machined from 304 stainless steel and built to the ISO4144 threading standard, giving plumbers and contractors a corrosion-resistant fitting for stepping a larger threaded port down to a smaller connection on stainless steel piping systems. This bushing is available in a range of reducing sizes, including 1" x 3/4", 1/2" x 3/8", 2" x 1", 3/4" x 1/4", and 3/4" x 1/2", so installers can select the exact reduction needed for a given rough-in or process piping transition. Stainless steel construction makes this bushing well suited for rough-in and process applications where standard malleable iron or brass would be prone to corrosion. Each size ships as part of a 50-piece package, making it a practical choice for stocking trucks or supply houses that regularly install stainless steel threaded fittings.

Key Features

  • Size Range: Available in 1" x 3/4", 1/2" x 3/8", 2" x 1", 3/4" x 1/4", and 3/4" x 1/2" reducing configurations for adapting larger threaded ports down to a smaller connection.
  • Durable Construction: Machined from 304 stainless steel for strong corrosion resistance in demanding rough-in and process piping environments.
  • Threaded Connection: Manufactured to the ISO4144 standard for reliable, consistent threaded engagement with mating stainless steel fittings.
  • Bushing Configuration: Reduces pipe size at a single fitting, simplifying transitions between differently sized threaded stainless steel components.
  • Packaging: Supplied 50 pieces per package for efficient stocking and bulk installation use.

Technical Specifications

  • Country of Origin: CHN
  • Prop 65 Warning: No
  • Packaging: 50 ea

Typical Applications

  • Stainless Steel Threaded Piping Systems
  • Rough-In Plumbing Reductions
  • Commercial and Industrial Process Piping
  • Corrosion-Resistant Fitting Applications
  • New Construction and Retrofit Stainless Steel Runs

Why Boshart?

Boshart supplies this bushing in 304 stainless steel to the ISO4144 thread standard, giving installers a consistent, corrosion-resistant fitting across the full size range for stainless steel piping work. For best results when joining stainless steel threaded fittings, Boshart recommends using both gray stainless steel PTFE tape and gray Magic Pipe Thread Compound together to help ensure a secure, reliable seal at the joint. This combination of quality material and proper installation practice supports dependable, long-lasting connections in stainless steel rough-in applications across every available reducing size.

Manufacturer Resources

Product Specs

Prop 65 Warning:
No
list_batch:
BOS-20260923
Product Type:
Bushing
Standards:
ISO4144
Department:
Plumbing
Product Subgroup:
Bushings
Product Material:
Stainless Steel
Product Group:
Plumbing Fittings

Boshart SS304B-0503 – Frequently Asked Questions

1) What reducing sizes does the Boshart SS304B stainless bushing come in?
Seven reductions are offered: 1/2 x 3/8 inch, 3/4 x 1/4 inch, 3/4 x 1/2 inch, 1 x 3/4 inch, 1-1/4 x 1 inch, 1-1/2 x 1 inch, and 2 x 1 inch. The larger number is the male thread that screws into the bigger port, and the smaller is the female thread you land your smaller line in. Part numbers follow the same logic, so 3/4 x 1/2 is SS304B-0705 and 2 x 1 is SS304B-2010-3.
2) Will a Boshart SS304B bushing thread into NPT stainless fittings?
The SS304B is machined to the ISO4144 threading standard, which is the tapered pipe thread standard used across imported stainless threaded fittings. It mates with stainless steel threaded fittings of the same standard. If your existing run is specified NPT on the drawings, confirm the thread standard on the port you are bushing before you commit, since ISO and NPT tapers are not the same specification.
3) Do I need thread sealant with these stainless steel bushings, and which kind?
Yes, and stainless on stainless is the one joint you do not want to dry-thread, because it galls. Boshart recommends using gray stainless steel PTFE tape together with gray Magic Pipe Thread Compound on the male thread. Neither is included with the bushing, so add it to the order if your truck is not already stocked.
4) I need to step 2 inch down to 3/4 inch in one fitting. Can I do it with the SS304B?
Not in a single bushing. The largest reduction offered is 2 x 1 inch (SS304B-2010-3), so the deepest single step from a 2 inch port lands you at 1 inch. To get to 3/4 you would follow it with the 1 x 3/4 inch bushing, SS304B-1007. Two-step bushing stacks add length and another sealed joint, so on a tight rough-in a reducing coupling or a bushing plus a nipple may lay out better.
5) Can I use a stainless bushing instead of a brass or malleable iron one on a wet process line?
That is exactly the reason to pick the SS304B. It is machined from 304 stainless steel, so it holds up in rough-in and process piping where malleable iron or brass would corrode. On a dry interior domestic run, a brass or iron bushing does the same mechanical job; the stainless pays for itself where moisture, washdown, or process fluid is involved, and where the rest of the run is already stainless you should not be mixing dissimilar metals at the transition anyway.
6) Are the Boshart SS304B bushings sold individually or by the box?
Each size is supplied 50 pieces per package. That is a stocking quantity aimed at supply houses and trucks that run stainless threaded fittings regularly, so if you need a single fitting for one repair, expect to buy the 50-count pack for that size.
7) What is the difference between a reducing bushing and a reducing coupling for a stainless threaded transition?
A bushing like the SS304B reduces size at a single fitting: male thread on the large end, female on the small end, so it screws directly into an oversized port and gives you the smaller connection with almost no added length. A reducing coupling is female on both ends and needs two male threads coming into it. Use the bushing when you are landing into a tapped port or valve that is one or two sizes bigger than your line; use a coupling when you are joining two nipples or two threaded pipe ends.
8) Is there a Prop 65 warning on Boshart 304 stainless bushings?
No Prop 65 warning applies to the SS304B stainless reducing bushings. The fittings are made in China and machined from 304 stainless steel, which matters to institutional and government buyers who have to document both origin and Prop 65 status on submittals.
How fast can I get the Boshart SS304B-0503 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Boshart SS304B-0503 come with a warranty?
Absolutely. The Boshart SS304B-0503 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Boshart SS304B-0503?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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