HMAX MF-38 Max Flare 3/8″ SAE Flare Fitting (10-Pack) — Stainless Core, Leak-Tight

HMAX MF-38 — Max Flare 3/8″ SAE Flare Fitting (10-Pack)

The HMAX MF-38 Max Flare 3/8-inch SAE flare fitting is a premium press-connection fitting engineered to eliminate refrigerant leaks at flare joints. Built with a stainless-steel core that prevents deformation and cracking under thermal cycling, these 3/8″ fittings deliver a leak-tight seal every time, cutting callbacks on ductless mini-split, VRF, and refrigeration installs. Cedars HVAC Supply ships from our Miami, Florida warehouse — call us at (305) 850-6693 for volume pricing.

What Makes the HMAX Max Flare Different

Standard brass flare nuts distort when overtorqued, creating micro-gaps that leak R-410A, R-32, and R-454B under pressure. The HMAX Max Flare embeds a hardened stainless-steel insert inside the brass body, so the flare face stays perfectly conical no matter how many times the joint is broken and remade. Fittings can also be brazed cleanly if a service tech needs a permanent solution.

Specifications

• SKU: MF-38
• Brand: HMAX
• Size: 3/8″ (5/8-18 UNF)
• Connection: SAE Flare × ODF (copper solder)
• Body material: Forged brass
• Insert: Stainless-steel core
• Standard torque: 34 N·m
• Maximum torque: 42 N·m
• Compatible refrigerants: R-410A, R-32, R-454B, R-22 (service), R-134a
• Sold as: 10 fittings per order
• Application: Ductless mini-splits, VRF systems, commercial refrigeration

Applications

• Ductless mini-split line-set connections at indoor and outdoor units
• VRF branch selector and header connections
• Walk-in cooler and commercial refrigeration flare joints
• Service replacement of leaky OEM flare nuts
• Any 3/8″ copper line-set termination requiring a leak-tight, reusable joint

HMAX Max Flare 3/8″ — Frequently Asked Questions

Do these HMAX flare fittings work with R-454B?
Yes. The stainless-steel core is fully compatible with R-454B, R-32, R-410A, R-22, and R-134a. Torque to the standard spec above for a leak-tight seal on any of these refrigerants.

Can I braze the HMAX Max Flare fitting?
Yes. Unlike standard flare nuts, the HMAX body is designed to be brazed if you need to convert the joint from a serviceable connection to a permanent one. Clean the ODF side and braze as you would any copper-to-brass joint.

How many fittings come per order?
Each HMAX MF-38 order ships as a 10-pack. If you need a full case or contractor pricing, call Cedars HVAC at (305) 850-6693.

What size line set is this fitting for?
This is a 3/8″ fitting (5/8-18 UNF SAE flare on one side, 3/8″ ODF copper on the other). It matches any 3/8″ mini-split or refrigeration line set.

Why Buy HMAX Max Flare Fittings from Cedars HVAC

• Ships from our Miami, FL warehouse — most orders leave same or next business day
• Contractor volume pricing available — call (305) 850-6693
• 30-day returns on unopened boxes
• Direct HMAX distributor — genuine product, factory-warranted

Shipping and Returns

All HMAX fittings ship insured from Cedars HVAC Supply in Miami, Florida. Standard handling time is 5–7 business days. Ductless installers in Miami-Dade and Broward counties can call for local pickup at (305) 850-6693.