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HELI-COIL Thread Gauge: Thread Gauge, Helical Inserts, #4-40 Compatible External Thread Size - Installation Tools for Helical Inserts
HELI-COILInstallation Tools for Helical Inserts

HELI-COIL Thread Gauge: Thread Gauge, Helical Inserts, #4-40 Compatible External Thread Size

The HELI-COIL Thread Gauge (MPN 3688-04) is an inch-system installation tool for verifying #4-40 compatible external thread size in steel helical inserts. It is designed for right-hand, coarse-thread helical inserts…

SKU 3G-OTH-530908

Brand
HELI-COIL
Item
Thread Gauge: Thread Gauge, Helical Inserts, #4-40 Compatible External Thread Size
Category
Installation Tools for Helical Inserts
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Technical Specifications

HELI-COIL
Manufacturer Part Number
3688-04
Type
Helical Inserts, #4-40 Compatible External Thread Size, Steel
Tool Type
Thread Gauge
System of Measurement
Inch
Compatible Insert Type
Helical Inserts
Compatible Thread Type
Coarse
Compatible Thread Direction
Right Hand
View Full Spec Sheet

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

Product Description

The HELI-COIL Thread Gauge (MPN 3688-04) is an inch-system installation tool for verifying #4-40 compatible external thread size in steel helical inserts. It is designed for right-hand, coarse-thread helical inserts, ensuring correct thread fit during installation.

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 the HELI-COIL Thread Gauge 3688-04 used for?

The HELI-COIL Thread Gauge 3688-04 is used to verify the correct #4-40 external thread size in steel helical inserts before installation. It ensures proper thread fit for right-hand, coarse-thread applications, helping prevent cross-threading or insert damage during assembly in industrial maintenance and repair.

What are the specifications of the HELI-COIL Thread Gauge 3688-04?

The HELI-COIL Thread Gauge 3688-04 is an inch-system tool for #4-40 compatible external thread size. It is made of steel, designed for right-hand, coarse-thread helical inserts. The manufacturer part number is 3688-04, and it is a thread gauge tool type from HELI-COIL.

Where to buy the HELI-COIL Thread Gauge 3688-04 worldwide?

3G Electric supplies the HELI-COIL Thread Gauge 3688-04 to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your facility. Contact us for availability and lead time on this thread gauge for helical inserts.

How to use the HELI-COIL Thread Gauge for helical inserts?

To use the HELI-COIL Thread Gauge 3688-04, insert it into the tapped hole before installing the helical insert. The gauge should fit smoothly without force. If it binds, the thread size or condition may be incorrect. Always verify the gauge matches the insert's thread size and direction for reliable installation.

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 installation tools for 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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