We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 304 stainless steel reducing adapter, 7/8 in hex, 1 1/4 in long

Zoro Select

Zoro Select ZUSA-PF-7863 Reducing Adapter 304 Stainless Steel 3/8 in Female 1/8 in Male NPT 4900 psi

SKU CH-5JDW-GA1VA

304 stainless steel reducing adapter joining 3/8 in female NPT to 1/8 in male NPT, rated to 4,900 psi with 7/8 in hex and 1 1/4 in overall length

  • Connects 3/8 in female to 1/8 in male NPT threads
  • 304 stainless steel resists corrosion in fluid and gas systems
  • Rated to 4900 psi for high-pressure instrumentation use
  • 7/8 in hex flats allow secure wrench tightening
  • Low-lead compliant for potable water applications

Reducing Adapter for Instrumentation

The Zoro Select ZUSA-PF-7863 is a 304 stainless steel reducing adapter built for instrumentation and sampling systems. It connects a female 3/8 in NPT port to a male 1/8 in NPT port, enabling secure transitions between different pipe diameters. The fitting complies with ANSI B31.1 standards and carries a 4,900 psi maximum operating pressure rating.

304 Stainless Build and Thread Detail

Machined from 304 stainless steel, the adapter resists corrosion in fluid and gas lines compatible with the material. Side A provides a female 3/8 in NPT connection with 18 threads per inch, while Side B offers a male 1/8 in NPT connection with 27 threads per inch. A 7/8 in hex across flats allows standard wrench engagement, and the overall length measures 1 1/4 in with no pre-applied sealant included.

Verify Pressure and Media Compatibility

Confirm that your system operating pressure stays at or below 4,900 psi and that the process media is compatible with 304 stainless steel. The NPT threads require appropriate sealant applied during installation to ensure a leak-free joint. This adapter is not suited for applications exceeding the rated pressure or for media that attacks 304 stainless steel.

Highlights

  • Connects 3/8 in female to 1/8 in male NPT threads
  • 304 stainless steel resists corrosion in fluid and gas systems
  • Rated to 4900 psi for high-pressure instrumentation use
  • 7/8 in hex flats allow secure wrench tightening
  • Low-lead compliant for potable water applications

Specifications

BrandZORO SELECT

Questions about this item

What does the 18 threads-per-inch NPT thread on the 3/8-inch female side cap in practice?

The 18 threads-per-inch NPT thread on the 3/8-inch female side provides a tapered pipe seal rated to 4,900 psi maximum operating pressure for instrumentation and sampling applications with fluids or gases compatible with 304 stainless steel.

What physical clearance does the 7/8-inch hex on this reducing adapter need to fit or mount?

A 7/8-inch open-end or adjustable wrench is required to engage the hex flats across the adapter body for installation into the 3/8-inch female NPT port and 1/8-inch male NPT connection.

How is this NPT reducing adapter installed, and what step do people often miss?

Apply PTFE tape or pipe-thread sealant to the 27 threads-per-inch male 1/8-inch NPT side and the 18 threads-per-inch female 3/8-inch NPT side before tightening with a 7/8-inch wrench; the step often missed is sealing both tapered threads to prevent leaks at 4,900 psi.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.