PROTO Flare Nut Wrench Set: Alloy Steel, Satin, 9 Tools
The PROTO Flare Nut Wrench Set (MPN J3740) is a 9-tool, double-end, standard-head, 6-point flare nut wrench set in SAE & Metric sizes. Made of alloy steel with a satin finish and a 0° opening angle, it covers a size…
SKU 3G-OTH-272680
Also listed as: J 3740 · J-3740
Local availability & support
- Payment
- Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.
Need installation or engineering help?
Ask a question
Product Description
The PROTO Flare Nut Wrench Set (MPN J3740) is a 9-tool, double-end, standard-head, 6-point flare nut wrench set in SAE & Metric sizes. Made of alloy steel with a satin finish and a 0° opening angle, it covers a size range of 38 in to 11/16 in.
Frequently Asked Questions
What is the PROTO Flare Nut Wrench Set J3740 used for?
The PROTO J3740 set is designed for tightening or loosening flare nuts on hydraulic, fuel, and brake lines. Its 6-point, 0° opening angle grips nut flats securely, reducing rounding risk. Ideal for automotive, plumbing, and industrial maintenance applications.
What are the specifications of the PROTO J3740 flare nut wrench set?
This PROTO set includes 9 double-end wrenches in SAE & Metric sizes from 38 in to 11/16 in. Tools are made of alloy steel with a satin finish and a 0° opening angle. The set is standard-head, 6-point design for secure engagement on flare nuts.
Where to buy the PROTO J3740 flare nut wrench set worldwide?
3G Electric supplies the PROTO J3740 flare nut wrench set worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time; we source genuine PROTO tools for global industrial customers.
How to select the right flare nut wrench size for my application?
Match the wrench size to the flare nut's hex flats. The PROTO J3740 set covers 38 in to 11/16 in SAE and corresponding Metric sizes. For best grip, use a 6-point wrench with a 0° opening angle to avoid slipping on soft brass or steel nuts.
Used in
Common applications for PROTOPROTO Products
3G Electric supplies PROTO sae & metric, double end, standard-head, 6-point flare nut wrench sets. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.