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HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 1/4"-28 Thread Size - Screw-Locking Tanged Helical Inserts
HELI-COILScrew-Locking Tanged Helical Inserts

HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 1/4"-28 Thread Size

HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 100 PK (MPN A3591-4CNW250). These 18-8 stainless steel inserts feature a 1/4"-28 fine thread, right-hand direction, and a tensile strength of 200,000 to…

SKU 3G-OTH-528871

Brand
HELI-COIL
Item
Helical Insert: Tanged Tang Style, Screw-Locking, 1/4"-28 Thread Size
Category
Screw-Locking Tanged Helical Inserts
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Technical Specifications

HELI-COIL
Manufacturer Part Number
A3591-4CNW250
Type
Screw-Locking, 100 PK
Tensile Strength
200,000 to 250,000 psi
Finish Type
Dry Film Lubricant
Thread Size
1/4"-28
Thread Type
Fine
STI Tap Size
1/4"-28
Thread Direction
Right Hand
Compatible Material
Metal
Material Grade/Class
18-8
System of Measurement
Inch
View Full Spec Sheet

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

Product Description

HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 100 PK (MPN A3591-4CNW250). These 18-8 stainless steel inserts feature a 1/4"-28 fine thread, right-hand direction, and a tensile strength of 200,000 to 250,000 psi. Designed for metal substrates, they include a dry film lubricant finish and require an STI tap size of 1/4"-28.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is a HELI-COIL screw-locking helical insert used for?

A HELI-COIL screw-locking helical insert repairs or reinforces threads in metal substrates. The 18-8 stainless steel insert with a dry film lubricant provides a locking action that resists vibration loosening, making it ideal for automotive, aerospace, and industrial applications requiring reliable thread strength.

What are the specifications of the HELI-COIL A3591-4CNW250 insert?

This HELI-COIL insert has a 1/4"-28 fine thread, right-hand direction, and a tensile strength of 200,000 to 250,000 psi. It is made of 18-8 stainless steel, requires an STI tap size of 1/4"-28, and comes in a 100-pack with a dry film lubricant finish for metal substrates.

Where to buy HELI-COIL helical inserts worldwide?

3G Electric supplies HELI-COIL helical inserts worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver the A3591-4CNW250 screw-locking inserts to your facility. Contact us for availability and lead time on your order.

How to install a HELI-COIL tanged tang insert?

To install a HELI-COIL tanged tang insert, drill the hole to the specified size, tap it using the correct STI tap (1/4"-28 for this insert), then use a tang-style installation tool to wind the insert into the tapped hole. After installation, break off the tang with a punch for a flush finish.

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 screw-locking tanged helical inserts. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, #10-32 Thread Size, Plain, Plain, 100 PK (MPN A3591-3EN570). Key specifications — Material Grade/Class: Nitronic 60; Thread Direction: Right Hand; STI Tap Size: #10-32; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 psi; Thread Type: Fine.
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HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, #10-32 Thread Size, Plain, Plain, 100 PK (MPN A3591-3EN570). Key specifications — Material Grade/Class: Nitronic 60; Thread Direction: Right Hand; STI Tap Size: #10-32; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 psi; Thread Type: Fine.
HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, M2.5-0.45 Thread Size, 100 PK (MPN A4184-2.5CNW038). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: M2.5-0.45; Compatible Material: Metal; System of Measurement: Metric; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, #10-24 Thread Size, Plain, Plain, 100 PK (MPN A3585-3CN285). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: #10-24; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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HELI-COIL Helical Insert: Tanged Tang Style, Screw-Locking, 1/4"-20 Thread Size, 100 PK (MPN A3585-4CNW500). Key specifications — Material Grade/Class: 18-8; Thread Direction: Right Hand; STI Tap Size: 1/4"-20; Compatible Material: Metal; System of Measurement: Inch; Brand: HELI-COIL; Tensile Strength: 200,000 to 250,000 psi; Thread Type: Coarse.
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