Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
SPENCE 99J Threaded Thermowell, Brass, 12-1/2 in Insertion, 250 psi, 400°F - Temperature Regulator & Duct Sensor Thermowells
SPENCETemperature Regulator & Duct Sensor Thermowells

SPENCE 99J Threaded Thermowell, Brass, 12-1/2 in Insertion, 250 psi, 400°F

The SPENCE Threaded Thermowell: Brass (MPN 99J) is a temperature regulator and duct sensor thermowell designed for use with a 15 5/8 in stem length, 12 1/2 in insertion length, and 1 in stem diameter. It has a…

SKU 3G-OTH-179728

Brand
SPENCE
Item
99J Threaded Thermowell, Brass, 12-1/2 in Insertion, 250 psi, 400°F
Category
Temperature Regulator & Duct Sensor Thermowells
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

SPENCE
Manufacturer Part Number
99J
Type
For 15 5/8 in Stem Lg, For 1 in Stem Dia
Insertion Lg
12 1/2 in
Maximum Operating Pressure
250 psi
Maximum Operating Temperature
400°F

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

SPENCE Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SPENCE Threaded Thermowell: Brass (MPN 99J) is a temperature regulator and duct sensor thermowell designed for use with a 15 5/8 in stem length, 12 1/2 in insertion length, and 1 in stem diameter. It has a maximum operating pressure of 250 psi and a maximum operating temperature of 400°F.

Frequently Asked Questions

What is the SPENCE threaded thermowell used for?

The SPENCE threaded thermowell (MPN 99J) is used to protect temperature sensors in industrial piping systems, such as steam or process lines. It allows accurate temperature measurement while shielding the sensor from high pressure, flow, and corrosive media. Common applications include HVAC ducts, boilers, and temperature regulation loops.

What are the specifications of the SPENCE threaded thermowell?

The SPENCE threaded thermowell (MPN 99J) is made of brass with a 15 5/8 in stem length, 12 1/2 in insertion length, and 1 in stem diameter. It has a maximum operating pressure of 250 psi and a maximum operating temperature of 400°F. It is designed for threaded installation in temperature regulator and duct sensor applications.

Where to buy the SPENCE threaded thermowell worldwide?

You can source the SPENCE threaded thermowell (MPN 99J) through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time; we provide reliable sourcing for this SPENCE component.

How to install a SPENCE threaded thermowell?

To install the SPENCE threaded thermowell, first ensure the process line is depressurized and cool. Apply thread sealant to the NPT threads, then hand-tighten the thermowell into the mating fitting. Use a wrench to snug it without over-torquing. Insert the temperature sensor fully into the thermowell and secure the connection. Always follow the manufacturer's guidelines for your specific sensor.

Used in

Common applications for SPENCE
Steam condensate removal in industrial process heating — SPENCE inverted-bucket steam traps (e.g., 85-CPG9)
Pressure reduction for steam distribution in commercial buildings — SPENCE D50A pressure regulators
Modulating control of steam flow in heat exchangers — SPENCE pneumatic globe control valves (e.g., K1TC811-36RA)
Air venting from steam mains and headers — SPENCE NAV-213 air vents
Condensate drainage in low-pressure steam heating systems — SPENCE 81S-C1E9 steam traps with strainer
Not sure this is the right part? Photo-identify it→

SPENCE Products

3G Electric supplies SPENCE temperature regulator & duct sensor thermowells. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
Cast iron general purpose pressure regulator with 1/2 inch FNPT x FNPTF connections. Designed to reduce and stabilize pressure in steam, air, or gas systems. Rated for inlet pressures from 30 psi to 125 psi and operating temperatures from 33°F to 400°F. Suitable for use in industrial piping systems such as steam distribution and process control
SPENCE
Cast iron general purpose pressure regulator with 1/2 inch FNPT x FNPTF connections. Designed to reduce and stabilize pressure in steam, air, or gas systems. Rated for inlet pressures from 30 psi to 125 psi and operating temperatures from 33°F to 400°F. Suitable for use in industrial piping systems such as steam distribution and process control
Cast iron general purpose pressure regulator with 3/8 in FNPT x FNPTF connections. Rated for 40 psi to 110 psi and 33°F to 400°F. Used to reduce and stabilize downstream pressure in steam, air, or liquid systems for industrial heating, process control, and plant utility lines
SPENCE
Cast iron general purpose pressure regulator with 3/8 in FNPT x FNPTF connections. Rated for 40 psi to 110 psi and 33°F to 400°F. Used to reduce and stabilize downstream pressure in steam, air, or liquid systems for industrial heating, process control, and plant utility lines
Cast iron general purpose pressure regulator with 3/4 in FNPT x FNPTF connections. Reduces and maintains downstream pressure in steam, air, or liquid systems. Pressure range 2 psi to 20 psi; temperature range 33°F to 400°F
SPENCE
Cast iron general purpose pressure regulator with 3/4 in FNPT x FNPTF connections. Reduces and maintains downstream pressure in steam, air, or liquid systems. Pressure range 2 psi to 20 psi; temperature range 33°F to 400°F
Cast iron general purpose pressure regulator with 1 1/4 in FNPT x FNPTF connections. Setpoint range 2 psi to 15 psi, operating temperature 33°F to 400°F. Used to reduce and stabilize steam, air, or gas pressure in industrial piping systems
SPENCE
Cast iron general purpose pressure regulator with 1 1/4 in FNPT x FNPTF connections. Setpoint range 2 psi to 15 psi, operating temperature 33°F to 400°F. Used to reduce and stabilize steam, air, or gas pressure in industrial piping systems
This cast iron pressure regulator reduces and maintains downstream pressure in steam, air, or liquid systems. It features 2 in FNPT x FNPTF connections, a pressure range of 10 psi to 60 psi, and a temperature range of 33°F to 400°F. Suitable for industrial process control, heating systems, and plant utility lines
SPENCE
This cast iron pressure regulator reduces and maintains downstream pressure in steam, air, or liquid systems. It features 2 in FNPT x FNPTF connections, a pressure range of 10 psi to 60 psi, and a temperature range of 33°F to 400°F. Suitable for industrial process control, heating systems, and plant utility lines
This SPENCE cast iron pressure regulator features 3/8 inch FNPT x FNPTF connections and an adjustable outlet pressure range of 2 to 30 psi. It is designed for general purpose use in steam, air, or gas systems, operating at temperatures from 33°F to 400°F. Typical applications include pressure reduction and stabilization in industrial piping, steam heating, and process control
SPENCE
This SPENCE cast iron pressure regulator features 3/8 inch FNPT x FNPTF connections and an adjustable outlet pressure range of 2 to 30 psi. It is designed for general purpose use in steam, air, or gas systems, operating at temperatures from 33°F to 400°F. Typical applications include pressure reduction and stabilization in industrial piping, steam heating, and process control

More from SPENCE

View all SPENCE parts →
Threaded thermowell for temperature regulators and duct sensors, constructed of stainless steel. Designed for use with a 13 3/8 in stem length and 10 1/2 in insertion length. Rated for a maximum operating pressure of 250 psi and a maximum operating temperature of 400°F. Commonly used in industrial piping systems to protect temperature sensors and allow replacement without system shutdown
SPENCE
Threaded thermowell for temperature regulators and duct sensors, constructed of stainless steel. Designed for use with a 13 3/8 in stem length and 10 1/2 in insertion length. Rated for a maximum operating pressure of 250 psi and a maximum operating temperature of 400°F. Commonly used in industrial piping systems to protect temperature sensors and allow replacement without system shutdown
Brass threaded thermowell for use with temperature sensors in piping and duct systems. Accommodates a 13 3/8 in stem length with a 10 1/2 in insertion length. Rated for maximum operating pressure of 250 psi and maximum temperature of 400°F
SPENCE
Brass threaded thermowell for use with temperature sensors in piping and duct systems. Accommodates a 13 3/8 in stem length with a 10 1/2 in insertion length. Rated for maximum operating pressure of 250 psi and maximum temperature of 400°F
Threaded thermowell for use with temperature regulators and duct sensors. Accommodates a 15 5/8 in stem length with a 12 1/2 in insertion length. Rated for maximum operating pressure of 250 psi and maximum operating temperature of 400°F. Suitable for protecting sensors in piping systems
SPENCE
Threaded thermowell for use with temperature regulators and duct sensors. Accommodates a 15 5/8 in stem length with a 12 1/2 in insertion length. Rated for maximum operating pressure of 250 psi and maximum operating temperature of 400°F. Suitable for protecting sensors in piping systems