Nexlok Industrial Self-tapping Inserts are metal inserts designed to tap directly into soft materials without the need for pre-tapping. Unlike conventional Threaded Inserts, the Nexlok Industrial is equipped with slots or cutting holes that ensure a clean cut of the thread in the host material during installation. This system enables quick, robust and reliable installation, particularly in aluminium, engineering plastics or light alloys. Ideal solution for industrial applications where ease of assembly, mechanical strength and time savings are crucial.
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Product Name |
Self-tapping Insert with Cutting Bores |
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Brand Name |
Nexlok Industrial |
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Surface Treatment |
Carbon Steel - Yellow/blue/white Zinc plated; Stainless Steel - Passivated |
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Material |
Stainless steel303(1.4305), Carbon steel |
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Type |
307/308 cutting bores |
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Lead Time |
In stock 3-10 delivery days |
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Place of Origin |
Shenzhen, China |
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Certification |
SGS, ISO9001:2015, RoHs, REACH |
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Service |
Support OEM ODM Customized |
Other Recommend Related Product
SS 308 Inserts
Corrosion-resistant, high-strength inserts for aluminum and plastics.
Yellow Zinc 302 Inserts
Wear-resistant, rust-proof inserts for stronger threads.
Color Zinc 308 Inserts
Durable, plated inserts for industrial applications.
Installation Tools
Professional tools for quick and reliable insert installation.
Type 307 Cutting Bores Self Tapping Insert Parameter Table
Metric Series
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Internal Thread |
External Thread |
Length |
Recommended Tap Drill T |
Minimum Hole Depth L |
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Aluminum |
Iron Steel |
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M3 |
M5-0.6 |
4 |
4.6-4.7 |
4.7-4.8 |
6 |
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M3.5 |
M6-0.8 |
5 |
5.5-5.6 |
5.6-5.7 |
7 |
|
M4 |
M6.5-0.8 |
6 |
6.0-6.1 |
6.1-6.2 |
8 |
|
M5 |
M8-1 |
7 |
7.4-7.6 |
7.6-7.7 |
9 |
|
M6 |
M10-1.25 |
8 |
9.3-9.5 |
9.5-9.6 |
10 |
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M8 |
M12-1.5 |
9 |
11.1-11.3 |
11.3-11.5 |
11 |
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M10 |
M14-1.5 |
10 |
13.1-13.3 |
13.4-15.4 |
13 |
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M12 |
M16-1.75 |
12 |
15.0-15.2 |
15.2-15.4 |
15 |
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M14 |
M18-2 |
14 |
17.0-17.2 |
17.2-17.4 |
17 |
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M16 |
M20-2 |
14 |
19.0-19.2 |
19.2-19.4 |
17 |
UNF/UNC Series
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Internal Thread |
External Thread |
Length |
Recommended Tap Drill T |
Minimum Hole Depth L |
|
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Aluminum |
Iron Steel |
||||
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4-40 |
M5-0.6 |
4 |
4.6-4.7 |
4.7-4.8 |
6 |
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6-32 |
M6-0.8 |
5 |
5.5-5.6 |
5.6-5.7 |
7 |
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8-32 |
M6.5-0.8 |
6 |
6.0-6.1 |
6.1-6.2 |
8 |
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10-24 |
M8-1 |
7 |
7.4-7.6 |
7.6-7.7 |
9 |
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1/4-20 |
M10-1.25 |
8 |
9.3-9.5 |
9.5-9.6 |
10 |
|
5/16-18 |
M12-1.5 |
9 |
11.1-11.3 |
11.3-11.5 |
11 |
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3/8-16 |
M14-1.5 |
10 |
13.1-13.3 |
13.4-15.4 |
13 |
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7/16-14 |
M16-1.75 |
12 |
15.0-15.2 |
15.2-15.4 |
15 |
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1/2-13 |
M18-2 |
14 |
17.0-17.2 |
17.2-17.4 |
17 |
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5/8-11 |
M20-2 |
14 |
19.0-19.2 |
19.2-19.4 |
17 |
Which Industries Choose Us?
Customer Industry Applications
Our self-tapping inserts are trusted across multiple high-demand industries, providing reliable thread strength and efficient assembly solutions:
Oil & Gas
Leading manufacturers of pumps, valves, and pipelines use our self-tapping inserts to ensure secure connections under high-pressure and high-temperature conditions, significantly reducing maintenance requirements.
01
Precision Machining
Precision component manufacturers rely on our inserts for aluminum housings and machine tool parts, enhancing thread durability and maintaining dimensional accuracy even after multiple assembly cycles.
02
Aerospace
Aerospace component suppliers apply our self-tapping inserts in lightweight alloy structures, ensuring long-term reliability for engines and airframe components under extreme vibration and temperature conditions.
03
Hardware & Tools
Our inserts are widely used in hand tools and power tools to provide high-strength fastening solutions, improving product longevity and performance.
04
Defense & Military
Military equipment manufacturers incorporate our self-tapping inserts into critical components, meeting stringent requirements for strength, corrosion resistance, and secure fastening in demanding operational environments.
05
Through real-world applications across these industries, our self-tapping inserts deliver enhanced thread performance, reliability, and cost-efficiency for our customers.
Self Tapping Thread Repair Inserts Installation Steps
Instruction for Use
Drilling
Clear the damaged thread witha drill bit or create a new hole in the parent material. For strong,hard and tough materials it is recommended to tap the thread(max. intermediate tap) before the installation of Self tapping inserts.
01
Screwing Self Tapping Insert on the inserting tool
Screw the Self tapping insert, with cutting slots or holes pointing down wards, on the inserting tool. Lock the Self tapping insert with the nut by wrench.
02
Installing the insert
Screw the Self tapping insert into the borehole. The Self tapping insert is self-tapping.The inserting tool has a 1/4"hexagonal shank and can beused by a cordless screwdriveror a wrench socket.
03
Screwing off the inserting tool
Unlock the counter nut by a wrench and screw off the inserting tool. Created bolted connections with Self tapping inserts are vibration resistant,wear-free and have a highload capacity in materials with low shearing strength.
04
FAQ
Q1: What is a Type 307 Self-Tapping Insert? How does it differ from Type 302 and Type 308?
A: The Type 307 Self-Tapping Insert is a slotless, self-cutting threaded insert designed to form its own mating threads during installation.
Compared with Type 302 (slotted) and Type 308 (multiple cutting edges), Type 307 features a more compact structure and provides stable installation with minimal surface disruption, making it suitable for applications where space is limited or a clean finished appearance is required.
Q2: What base materials are suitable for Type 307 Self-Tapping Inserts?
A: Type 307 Self-Tapping Inserts are primarily used in medium- to low-strength materials, including:
● Aluminum and aluminum alloys
● Zinc alloys
● Copper
● Cast iron
● Selected engineering plastics
They are not recommended for hardened or high-strength steel substrates.
Q3: Is thread tapping required before installing a Type 307 insert?
A: No. Type 307 Self-Tapping Inserts require only a pre-drilled pilot hole. During installation, the external cutting threads form the internal thread directly in the base material, eliminating the need for tapping and reducing overall assembly time.
Q4: How much does a Type 307 Self-Tapping Insert improve thread strength?
A: When installed in soft materials such as aluminum alloys, Type 307 inserts can increase thread load capacity by approximately 1.5 to 2 times compared to the original base material thread.
They also significantly improve pull-out resistance and fatigue performance, making them suitable for applications involving repeated assembly and disassembly.
Q5: What are the requirements for pilot hole size and installation depth?
A: ● The pilot hole diameter must strictly follow the recommended specifications.
● The hole depth should be at least the insert length plus 0.5–1 pitch allowance.
● After installation, the insert should sit slightly below the surface to ensure proper assembly clearance and avoid interference.
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