We offer various self-tapping threaded insert designs to suit different performance requirements, including closed-end inserts, three-hole inserts, titanium inserts for lightweight strength, and slotted self-tapping inserts. All types are available in metric and inch sizes, with custom materials and thread specifications available upon request.
These inserts are commonly used in automotive, aerospace, precision machinery, electronics, medical devices, tooling, and thread repair applications. The self-cutting design ensures strong pull-out resistance, high torque capacity, and reliable thread engagement, especially in soft metals or materials where conventional tapping may fail.
Compared to Wire Thread Inserts
|
Feature |
308 Self-Threading Insert |
Wire Thread Insert (Helicoil) |
|
Structure |
|
 |
|
Installation Method |
Direct self-tapping installation, no pre-tapping required |
Requires pre-tapped hole and installation tool |
|
Hole Requirement |
Standard drilled hole |
Drilled hole + STI tap |
|
Installation Efficiency |
High, ideal for batch assembly |
Moderate, more installation steps needed |
|
Base Material Compatibility |
Aluminum, aluminum alloys, magnesium alloys, plastic, cast iron |
Aluminum alloys, steel, cast iron |
|
Thread Repair Capability |
Strong, can repair damaged threads directly |
Strong, but requires secondary machining |
|
Pull-Out Resistance |
Excellent, solid structure ensures high locking strength |
Excellent, evenly distributed load |
|
Vibration Resistance |
Good, suitable for vibrating environments |
Excellent, commonly used in aerospace |
|
Reusability |
Limited number of disassemblies |
High, durable for multiple disassemblies |
|
Dimensional Stability |
High, solid insert resists deformation |
High, elastic design self-compensates |
|
Typical Industries |
Machining, hardware tools, equipment repair, automotive parts |
Aerospace, automotive, military, electronics |
|
Key Advantages |
Fast installation, simple process, suitable for on-site repair |
High precision, reliable, long service life |
|
Cost Consideration |
Lower overall cost (materials + installation) |
Lower unit cost, but higher tool and process cost |
Quick Selection Guide
- For fast installation, simple process, and batch or on-site repairs → choose 308 Self-Threading Inserts.
- For high precision, multiple disassemblies, and aerospace or high-end applications → choose Wire Thread Inserts (Helicoil).
Product Advantages And Material
ADVANTAGES
EASY INSTALLATION
Self tapping inserts are easy to be installed. Simply drill the right hole diameter in the receiving material and insert the Locking Inserts Tech by using a manualltool or a screwdriver. No tapping needed.
01
HIGH PERFORMANCE
Type 308 cutting bores self tapping inserts particularly strong andarecanwithstand frequent assembly and disassembly of the screw, without altering the thread in light alloys, plastics and others.
02
COST SAVING
The use of self-tapping inserts can result in a reduction in thread size required, saving material, reducing weight and costs (i.e. M6 instead of M8 bolts, see fi g.) while maintaining the same pull-out resistance.
03
HIGH PULL-OUT RESISTANCE
Increased pull-out resistance thanks to a large shearing surface.
04
|
Type |
Dimensions |
Material |
Application |
|
Type302
|
From M2 to M30 |
Case hardened zinc-plated steel |
- Light alloy |
|
Type307-308
|
From M3 to M16 |
Case hardened zinc-plated steel |
- Aluminium and aluminium alloys - Magnesium alloys - Cast iron, brass, bronze - Duroplastics and thermoplastics |
Technical Characteristics (Type 308)
Metric Series
|
Internal Thread |
External Thread |
Length |
Recommended Tap Drill T |
Minimum Hole Depth L |
|
|
Aluminum |
Iron Steel |
||||
|
M3 |
M5-0.6 |
5 |
4.6-4.7 |
4.7-4.8 |
8 |
|
M3.5 |
M6-0.8 |
6 |
5.5-5.6 |
5.6-5.7 |
10 |
|
M4 |
M6.5-0.8 |
8 |
6.0-6.1 |
6.1-6.2 |
10 |
|
M5 |
M8-1 |
10 |
7.4-7.6 |
7.6-7.7 |
13 |
|
M6 |
M10-1.25 |
12 |
9.3-9.5 |
9.5-9.6 |
15 |
|
M8 |
M12-1.5 |
14 |
11.1-11.3 |
11.3-11.5 |
17 |
|
M10 |
M14-1.5 |
18 |
13.1-13.3 |
13.4-15.4 |
22 |
|
M12 |
M16-1.75 |
22 |
15.0-15.2 |
15.2-15.4 |
26 |
|
M14 |
M18-2 |
24 |
17.0-17.2 |
17.2-17.4 |
28 |
|
M16 |
M20-2 |
24 |
19.0-19.0 |
19.2-19.4 |
28 |
UNC/UNF Series
|
Internal Thread |
External Thread |
Length |
Recommended Tap Drill T |
Minimum Hole Depth L |
|
|
Aluminum |
Iron Steel |
||||
|
4-40 |
M5-0.6 |
5 |
4.6-4.7 |
4.7-4.8 |
8 |
|
6-32 |
M6-0.8 |
6 |
5.5-5.6 |
5.6-5.7 |
10 |
|
8-32 |
M6.5-0.8 |
8 |
6.0-6.1 |
6.1-6.2 |
10 |
|
10-24 |
M8-1 |
10 |
7.4-7.6 |
7.6-7.7 |
13 |
|
1/4-20 |
M10-1.25 |
12 |
9.3-9.5 |
9.5-9.6 |
15 |
|
5/16-18 |
M12-1.5 |
14 |
11.1-11.3 |
11.3-11.5 |
17 |
|
3/8-16 |
M14-1.5 |
18 |
13.1-13.3 |
13.4-15.4 |
22 |
|
7/16-14 |
M16-1.75 |
22 |
15.0-15.2 |
15.2-15.4 |
26 |
|
1/2-13 |
M18-2 |
24 |
17.0-17.2 |
17.2-17.4 |
28 |
|
5/8-11 |
M20-2 |
24 |
19.0-19.0 |
19.2-19.4 |
28 |
Packaging & Shipping
The lead time takes about 1-7 working days, and the transport time is estimated according to different regions.
1). By Express (3-5 working days), suitable for Urgent Time and Small Quantity.
2). By Sea (15-30 days), suitable for regular Mass Production.
3). By Air (5-7 days), from Airport to Airport.
Tell us your requirement about the Shipping by clicking here, so that we can provide solution to save your budget and meet your need!
Our Certifications
FAQ
Q: What's your business scope?
A: Standard Thread Insert Parts Offer or Support OEM ODM Service.
Q: How to contact us?
A: You can send inquiry of our products,it will be replied within 2 hours. And you can contact dirrectly with us through Website TM or WhatsApp and Email as you like.
Q: What information should I give to you for inquiry?
A: If you have drawings or samples,pls feel free to send us,and tell us your special requirements such as material, tolerance, surface treatments and the amount you need,ect.
Q: What about the delivery time?
A: For standard products in stock, we can ship on the same day, and logistics usually takes 5–10 days. Custom-made products require about 2 weeks for production and delivery.
Q: What about the payment terms?
A: Generally DAP/EXW/FOB and we can also consult accroding to your requirement.
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