Thread Inserts Tapping-free internal thread forming and thread repair
Type 308 self-tapping inserts
Product photos
Actual photos, not renders
Illustration note
The image shows an actual part of this specification; appearance differs with surface treatment and head style, and the delivered part prevails.
Images are for appearance and structure reference; dimensions and tolerances are subject to the specifications and the applicable standards on this page.
Product description
Compiled from the existing technical description of this product on this site
The Type 308 self-tapping insert (three-hole type) has three cutting round holes in its body. When screwed in, the cutting edges at the hole positions cut the mating thread in the base material, allowing installation without pre-tapping. Suitable for soft materials and castings, it significantly improves thread strength and wear resistance and is often used for repairing damaged threaded holes.
Specifications
The parameters listed on this page are subject to final inspection and the applicable standards; items not listed follow the customer drawing or the order agreement and are not committed by default.
| Material | Carbon steel / stainless steel |
|---|---|
| Mounting method | Direct screw-in |
| Type | Type 308 |
| Surface treatment | Zinc-plated / passivated (optional) |
| Standard | Per customer drawing / corporate standard (Type 308 three-hole self-tapping insert); threads GB/T 196, GB/T 197 |
| Typical application | Tapping-free internal thread forming and thread repair |
Spec lookup
Look up your operating conditions directly across the 9 models in this series — front-end filtering only, no redirects, no URL changes
Filter results are based on the specification fields published on each model page and are for preliminary screening only; the final selection must be confirmed in light of the actual load, plate thickness and assembly process.
Drawings and documentation
Official catalogues and manuals are available for direct download; custom drawings are handled per project
Manufacturing process
The usual process route for this product family; actual operations follow the drawing and order requirements.
- Profile / wire formingCross-section and profile forming
- Wound or turnedInternal and external thread machining
- Heat treatmentReinforcement with wire thread inserts and metal inserts
- Surface treatmentZinc-plated / passivated / anodised
- 100% go/no-go gauge inspectionGo/no-go thread gauging and installation torque verification
Capacity & delivery
Taken from the company's published capacity and certification information; no unverified claims are included.
FAQ
Material, standards, surface treatment and installation points for this model; the data comes from the specification table on this page and from the national standards cited in the answers.
Q1What material does the Type 308 self-tapping insert use? What strength level does it reach?
Specified in the specification table on this page: material carbon steel / stainless steel. A material certificate and mechanical property test report can be provided with the goods; batch acceptance is carried out in accordance with the above specifications.
Q2Which surface treatments are available for the Type 308 self-tapping insert? How do I choose?
Surface treatment specified in the specification table on this page: zinc-plated / passivated (optional). Different coatings differ in appearance, corrosion resistance and cost; select according to the service environment and the order agreement.
Q3In which applications is the Type 308 self-tapping insert used?
Typical applications listed in the product description on this page: plastic and composite parts; aluminium-zinc alloy castings; cast iron and die castings; repair of damaged threaded holes. Overview: The Type 308 self-tapping insert (three-hole type) has three cutting round holes in its body. When screwed in, the cutting edges at the hole positions cut the mating thread in the base material, allowing installation without pre-tapping.
Q4How is the Type 308 self-tapping insert installed? What should be noted?
Specified in the specification table on this page: installation by direct screwing. Hole diameter and plate thickness should match the recommended values for the model; a trial installation is recommended for confirmation before volume production.
Q5How is a self-tapping insert such as the Type 308 installed?
Both are self-tapping thread inserts. First pre-drill the pilot hole as required by the model, then use a dedicated installation tool to screw the insert in until flush with the end face; the insert’s own threads cut or form the thread in the pilot hole. Pilot hole diameter and depth follow the recommended values for each model; do not force the insert in. This is a functional explanation; for verification refer to GB/T 196 and GB/T 197. Data for this model is subject to the specification table on this page. (Applies to this model: “Type 308 self-tapping insert”.)
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