The Miljoco-Weiss BN12-75BS is a Weiss brass bimetal thermometer thermowell with a 3/4″ NPT external thread, a 12″ stem length and a 7-1/2″ insertion length, with a 3″ lag extension.
Catalog number BN12-75 is listed in the Weiss Bimetal Thermowells submittal for 3″ and 5″ bimetal thermometers.
The BS suffix on the complete catalog number defines brass construction; the same well is published in 304SS (SS suffix) and 316SS (316SS suffix).
Specifications on this page are taken from the Weiss Bimetal Thermowells submittal. Verified 2026-09-11.
Warranty
Miljoco-Weiss warrants its products to be free from material defects in material and workmanship for 12 months from the date of shipment, or such other period as provided in the product documentation, per the published Miljoco-Weiss terms and conditions of sale (Section 15, Limited Warranty).
Key Features
Brass construction
The BS suffix defines brass as the thermowell material.
3/4″ NPT external thread
Catalog group 75 is listed with a 3/4″ NPT external thread.
12″ stem, 7-1/2″ insertion
Stem length and insertion length per the Weiss thermowell table.
3″ lag extension
Lag extension listed for this catalog number.
Technical Specifications
| Model | BN12-75BS |
| Type | Bimetal thermometer thermowell |
| Catalog Number | BN12-75 with BS (brass) suffix |
| External Thread | 3/4″ NPT |
| Stem Length | 12″ |
| Insertion Length | 7-1/2″ |
| Lag Extension | 3″ |
| Shank Diameter | 3/4″ |
| Material | Brass |
| Other Materials (separate part numbers) | 304SS (SS suffix), 316SS (316SS suffix) |
Documentation
Related Products
Frequently Asked Questions
What thread does the BN12-75BS use?
A 3/4″ NPT external thread.
How long is the stem and insertion?
Stem length 12″, insertion length 7-1/2″, with a 3″ lag extension.
What material is it?
Brass, defined by the BS suffix. The same catalog number is also published in 304SS and 316SS under different suffixes.
Manufacturer Warranty
Miljoco-Weiss warrants this product to be free from material defects in material and workmanship for 12 months from date of shipment, per the published Miljoco-Weiss terms and conditions of sale.
Warranty service requires written notice of the defect within seven days of discovery. Remedy is repair, replacement or credit at the manufacturer's discretion. Normal wear, corrosion, misuse and unauthorized modification are excluded.
- Type:
- Thermowell
- Series:
- BN12
- Connection Size:
- 3/4 in
- Connection Type:
- NPT
- Stem Length:
- 12 in
- Insertion Length:
- 7-1/2 in
- Lag Extension:
- 3 in
- Material:
- Brass
