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(S61-6) COMPRESSION NUT 3/8

Description & Features

Manufactured by Midland Industries, the 3/8 compression nut (S61-6) is a standard fitting component used to secure compression connections in fluid and gas conveyance systems. Designed for 3/8 in. tubing, it threads onto a compression fitting body to clamp the ferrule in place and create a reliable, leak-resistant seal without the need for soldering or flaring.

Midland Industries compression nuts are widely used in industrial fluid handling assemblies where a secure, serviceable tube connection is required. The S61-6 designation identifies this as part of Midland's S61 compression fitting series, making it a straightforward replacement or supplemental component for existing assemblies using the same series.

SKU: 18037

Supplier Part Number (MPN): 18037

Specifications

Brand Midland Industries	Brand Midland Industries	Pack Size 1.00	UOM EA	Supplier Part Number 18037	Product Weight 0.02 lbs

Product Questions & Answers (1)

Question by: Diane S on Feb 28, 2026, 10:37 AM

got a Midland S61 compression fitting body already, is the S61-6 nut the right replacement for 3/8 tubing?

Answer by: Customer Support on Mar 2, 2026, 6:00 AM

Within Midland’s S61 compression fitting series, the S61-6 is the 3/8 in. compression nut meant to thread onto the fitting body and clamp the ferrule for a leak resistant compression seal on 3/8 in. tubing.