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

3G Electric
RFQ CartGet a QuoteSign inSign up
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M12-1.50 Thread Size, Plain - Free-Running Tanged Helical Inserts
HELI-COILFree-Running Tanged Helical Inserts

HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M12-1.50 Thread Size, Plain

The HELI-COIL Helical Insert (MPN R3745-12) is a tanged tang style, free-running helical insert with an M12-1.50 fine, right-hand thread. Made from 18-8 stainless steel, it offers a tensile strength of 200,000 to…

SKU 3G-OTH-599230

Brand
HELI-COIL
Item
Helical Insert: Tanged Tang Style, Free-Running, M12-1.50 Thread Size, Plain
Category
Free-Running Tanged Helical Inserts
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

Technical Specifications

HELI-COIL
Manufacturer Part Number
R3745-12
Type
Free-Running, M12-1.50 Thread Size, Plain, Plain, 6 PK
View Full Spec Sheet

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

HELI-COIL Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HELI-COIL Helical Insert (MPN R3745-12) is a tanged tang style, free-running helical insert with an M12-1.50 fine, right-hand thread. Made from 18-8 stainless steel, it offers a tensile strength of 200,000 to 250,000 psi and comes in a 6-pack. 3G Electric interprets your demand for thread repair or reinforcement, sources this genuine HELI-COIL product, and supports your application with specialist expertise across 14 industrial departments.

Frequently Asked Questions

What is a HELI-COIL helical insert used for?

A HELI-COIL helical insert repairs or reinforces internal threads in metal. It is commonly used in automotive, aerospace, and industrial maintenance to restore stripped threads or strengthen tapped holes in softer materials like aluminum.

What are the specifications of the HELI-COIL R3745-12 insert?

The HELI-COIL R3745-12 is a free-running, tanged tang style insert with M12-1.50 fine, right-hand threads. It is made from 18-8 stainless steel with a tensile strength of 200,000 to 250,000 psi. The pack contains 6 inserts.

Where to buy HELI-COIL R3745-12 inserts worldwide?

3G Electric supplies genuine HELI-COIL R3745-12 inserts worldwide. We handle full logistics and customs clearance to deliver to your facility. Contact us for pricing and lead time on this M12-1.50 thread repair insert.

How to install a HELI-COIL tanged helical insert?

Installation requires drilling the damaged thread to the specified tap drill size, tapping with a HELI-COIL tap, then winding the insert onto the installation tool and screwing it into the tapped hole. Break off the tang after installation for a permanent thread.

Used in

Common applications for HELI-COIL
Aerospace engine repair — HELI-COIL STI taps for M12x1.75 metric threads in aluminum alloy components
Automotive transmission rebuild — HELI-COIL STI taps for 7/16-14 UNC threads in cast iron housings
Industrial pump maintenance — HELI-COIL STI taps for #10-32 UNF threads in stainless steel pump bodies
Hydraulic cylinder repair — HELI-COIL STI taps for M6x1 metric threads in steel cylinder heads
General manufacturing — HELI-COIL STI taps for 9/16-18 UNF threads in machinery base plates

HELI-COIL Products

3G Electric supplies HELI-COIL free-running tanged helical inserts. 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 →

More from HELI-COIL

View all HELI-COIL parts →
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M4-0.70 Thread Size, Plain, Plain, 100 PK (MPN A1084-4EN040). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M4-0.70; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 4.2mm; attr798708: 200,000 psi.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M4-0.70 Thread Size, Plain, Plain, 100 PK (MPN A1084-4EN040). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M4-0.70; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 4.2mm; attr798708: 200,000 psi.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-28 Thread Size, Plain, 1,000 PK (MPN 1191-4CN250S). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 1/4"-28; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-28 Thread Size, Plain, 1,000 PK (MPN 1191-4CN250S). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 1/4"-28; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-18 Thread Size, Plain, Plain, 12 PK (MPN R327-4). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 1/4"-18; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: ANPT.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 1/4"-18 Thread Size, Plain, Plain, 12 PK (MPN R327-4). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 1/4"-18; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: ANPT.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M5-0.80 Thread Size, Plain, Plain, 100 PK (MPN A1084-5EN100). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M5-0.80; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 5.2mm; attr798708: 200,000 psi.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M5-0.80 Thread Size, Plain, Plain, 100 PK (MPN A1084-5EN100). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M5-0.80; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 5.2mm; attr798708: 200,000 psi.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 5/16"-24 Thread Size, Plain, 100 PK (MPN A1191-5CN625). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 5/16"-24; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, 5/16"-24 Thread Size, Plain, 100 PK (MPN A1191-5CN625). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: 5/16"-24; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M3-0.50 Thread Size, Plain, Plain, 100 PK (MPN A1084-3EN090). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M3-0.50; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 3.15mm; attr798708: 200,000 psi.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M3-0.50 Thread Size, Plain, Plain, 100 PK (MPN A1084-3EN090). Key specifications — attr798694: Nitronic 60; attr798710: Right Hand; attr798707: M3-0.50; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798681: 3.15mm; attr798708: 200,000 psi.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M10-1.25 Thread Size, Plain, Plain, 12 PK (MPN R4649-10). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: M10-1.25; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, M10-1.25 Thread Size, Plain, Plain, 12 PK (MPN R4649-10). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: M10-1.25; attr798676: Metal; attr798705: Metric; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Fine.
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, #6-32 Thread Size, Plain, Plain, 100 PK (MPN A1185-06CN138). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: #6-32; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Coarse.
HELI-COIL
HELI-COIL Helical Insert: Tanged Tang Style, Free-Running, #6-32 Thread Size, Plain, Plain, 100 PK (MPN A1185-06CN138). Key specifications — attr798694: 18-8; attr798710: Right Hand; attr798707: #6-32; attr798676: Metal; attr798705: Inch; attr798675: HELI-COIL; attr798708: 200,000 to 250,000 psi; attr798713: Coarse.