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

PROTO J3812M Metric Single End Ratcheting 12-Point Flare Nut Wrench, 12 mm - Metric, Single End, Ratcheting 12-Point Flare Nut Wrenches
PROTOMetric, Single End, Ratcheting 12-Point Flare Nut Wrenches

PROTO J3812M Metric Single End Ratcheting 12-Point Flare Nut Wrench, 12 mm

The PROTO J3812M is a metric, single-end, ratcheting 12-point flare nut wrench made from alloy steel with a black oxide finish. It features a 12 mm head size and an overall length of 5 1/2 inches.

SKU 3G-OTH-313283

Brand
PROTO
Item
J3812M Metric Single End Ratcheting 12-Point Flare Nut Wrench, 12 mm
Category
Metric, Single End, Ratcheting 12-Point Flare Nut Wrenches
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

PROTO
Manufacturer Part Number
J3812M
Type
Black Oxide
Overall Lg
5 1/2 in
Head Size
12 mm

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

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

Product Description

The PROTO J3812M is a metric, single-end, ratcheting 12-point flare nut wrench made from alloy steel with a black oxide finish. It features a 12 mm head size and an overall length of 5 1/2 inches.

Frequently Asked Questions

What is the PROTO J3812M flare nut wrench used for?

The PROTO J3812M is a metric, single-end, ratcheting 12-point flare nut wrench designed for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings. Its 12 mm head size and 5 1/2 in overall length provide access in tight spaces common in automotive and industrial maintenance.

What are the specifications of the PROTO J3812M flare nut wrench?

The PROTO J3812M is made from alloy steel with a black oxide finish. It has a 12 mm head size, 5 1/2 in overall length, and features a ratcheting 12-point design. The manufacturer part number is J3812M. It is a metric, single-end flare nut wrench suitable for professional use.

Where to buy the PROTO J3812M flare nut wrench worldwide?

3G Electric supplies the PROTO J3812M flare nut wrench worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on this alloy steel, black oxide wrench with a 12 mm head size.

How to select the right flare nut wrench size?

To select the correct flare nut wrench, measure the nut's hex size across the flats. The PROTO J3812M fits a 12 mm flare nut. Ensure the wrench is made from durable alloy steel, like this PROTO model, to resist spreading under torque. A ratcheting 12-point design helps in confined spaces.

Used in

Common applications for PROTO
Automotive assembly — PROTO J72102 impact socket set for fastening lug nuts on production lines
Heavy equipment maintenance — PROTO J3772T flare nut wrench for hydraulic line fittings on excavators
General industrial repair — PROTO J795SA adjustable wrench set for tightening bolts on conveyor systems
Aerospace manufacturing — PROTO J5240A slotted bit socket for adjusting fasteners in confined spaces
Oil and gas pipeline work — PROTO J5438 12-point socket for valve assembly in refineries
Construction site toolkits — PROTO J8179-T500 double box wrench for structural steel bolting
Not sure this is the right part? Photo-identify it

PROTO Products

3G Electric supplies PROTO metric, single end, ratcheting 12-point flare nut wrenches. 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
Alloy steel construction with satin finish. 12-point flare nut wrench with 10 mm and 12 mm head sizes, 7 in overall length. Designed for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines
PROTO
Alloy steel construction with satin finish. 12-point flare nut wrench with 10 mm and 12 mm head sizes, 7 in overall length. Designed for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines
Alloy steel flare nut wrench with satin finish. Double-end design with 13 mm and 14 mm 12-point heads. Overall length 7-1/2 inches. Used for tightening or loosening flare nuts on brake, fuel, and hydraulic lines
PROTO
Alloy steel flare nut wrench with satin finish. Double-end design with 13 mm and 14 mm 12-point heads. Overall length 7-1/2 inches. Used for tightening or loosening flare nuts on brake, fuel, and hydraulic lines
Alloy steel construction with satin finish. Double-end design with 12-point flare nut openings in 7 mm and 8 mm sizes. Overall length of 5 3/4 inches. Used for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines in maintenance and repair tasks
PROTO
Alloy steel construction with satin finish. Double-end design with 12-point flare nut openings in 7 mm and 8 mm sizes. Overall length of 5 3/4 inches. Used for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines in maintenance and repair tasks
Alloy steel flare nut wrench with satin finish. Double-end design with 16 mm and 18 mm 12-point heads. Overall length 8 3/4 inches. Used for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines
PROTO
Alloy steel flare nut wrench with satin finish. Double-end design with 16 mm and 18 mm 12-point heads. Overall length 8 3/4 inches. Used for tightening or loosening flare nuts on hydraulic, fuel, and refrigeration lines
Alloy steel construction with satin finish. Double-end, standard-head design with 12-point openings for 15 mm and 17 mm flare nuts. 8-inch overall length provides leverage for tightening or loosening flare nuts on brake lines, fuel lines, and hydraulic fittings
PROTO
Alloy steel construction with satin finish. Double-end, standard-head design with 12-point openings for 15 mm and 17 mm flare nuts. 8-inch overall length provides leverage for tightening or loosening flare nuts on brake lines, fuel lines, and hydraulic fittings
This PROTO flare nut wrench is made from alloy steel with a satin finish. It features 6-point, double-end heads sized 16 mm and 18 mm, with an overall length of 8-3/4 inches. Designed for turning flare nuts on brake, fuel, and hydraulic lines in automotive and industrial applications
PROTO
This PROTO flare nut wrench is made from alloy steel with a satin finish. It features 6-point, double-end heads sized 16 mm and 18 mm, with an overall length of 8-3/4 inches. Designed for turning flare nuts on brake, fuel, and hydraulic lines in automotive and industrial applications

More from PROTO

View all PROTO parts
Single-end ratcheting 12-point flare nut wrench with 18 mm head size and 7 1/4 in overall length. Black oxide finish on alloy steel construction. Used for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings
PROTO
Single-end ratcheting 12-point flare nut wrench with 18 mm head size and 7 1/4 in overall length. Black oxide finish on alloy steel construction. Used for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings
Alloy steel construction with black oxide finish. 15 mm head size, 7 1/4 in overall length. Ratcheting 12-point design for use on flare nuts in hydraulic, fuel, and refrigeration systems
PROTO
Alloy steel construction with black oxide finish. 15 mm head size, 7 1/4 in overall length. Ratcheting 12-point design for use on flare nuts in hydraulic, fuel, and refrigeration systems
Single-end ratcheting 12-point flare nut wrench with a 14 mm head size and 7 1/4 in overall length. Made from alloy steel with a black oxide finish. Designed for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings in confined spaces
PROTO
Single-end ratcheting 12-point flare nut wrench with a 14 mm head size and 7 1/4 in overall length. Made from alloy steel with a black oxide finish. Designed for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings in confined spaces
Alloy steel construction with black oxide finish. Single-end ratcheting 12-point design for flare nuts. 10 mm head size, 5 1/2 in overall length. Used for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings
PROTO
Alloy steel construction with black oxide finish. Single-end ratcheting 12-point design for flare nuts. 10 mm head size, 5 1/2 in overall length. Used for tightening or loosening flare nuts on brake lines, fuel systems, and hydraulic fittings
Alloy steel construction with black oxide finish. Single-end ratcheting 12-point design for 16 mm flare nuts. Overall length 7 1/4 in. Used on brake lines, fuel systems, and hydraulic fittings
PROTO
Alloy steel construction with black oxide finish. Single-end ratcheting 12-point design for 16 mm flare nuts. Overall length 7 1/4 in. Used on brake lines, fuel systems, and hydraulic fittings