Introduction and Selection of Stainless Steel Helical Inserts

Stainless steel helical inserts are a new type of internal thread fastener wound with high strength, high precision, and high surface quality corrosion-resistant diamond-shaped stainless steel helical inserts shaped like a spring. The Stainless Steel Helical Inserts set is inserted into the screw hole, the outer surface of the wire screw set is attached to the screw hole by the elastic force, and the inner surface forms a new thread, which is used to screw in the screw or bolt, so that the screw or bolt is not directly in contact with the matrix, protecting the matrix and screw. It can prolong the thread's service life, increase the thread connection's strength, improve the thread's force surface, improve the bearing capacity and fatigue strength of the thread connection, and anti-seismic and anti-loosening. The application of low-strength engineering materials such as aluminum and magnesium alloy can improve the strength and wear resistance of thread, and the Stainless Steel Helical Inserts can also enhance the force of thread, make the overall force of thread, and improve the strength of thread connection. Stainless Steel Helical Inserts can also be used to repair worn or damaged internal threaded holes. Stainless Steel Helical Inserts and self-tapping screw sleeve products in aviation, spacecraft, Marine, automotive power machinery, hydraulic transmission machinery, pneumatic tools, pneumatic components, chemical fiber, textile, tobacco machinery, optical instruments, electrical appliances, high-voltage switches, automotive repair and other industries of products and equipment have been widely used.

What are the Stainless Steel Helical Inserts?

Wire Thread Inserts (Stainless Steel Helical Inserts), referred to as Stainless Steel Helical Inserts, are a new type of internal thread fastener. It is usually made of wire wound in the shape of a spring-type, high-precision, internal and external thread concentric body. The primary function of the Stainless Steel Helical Inserts is to strengthen and protect the internal thread of the low-strength material. When the Stainless Steel Helical Inserts are embedded in the threaded hole of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, glass steel, plastic, and so on, they can form high-precision internal thread in line with international standards, which has the characteristics of high connection strength, earthquake resistance, impact resistance and wear resistance, and can disperse the stress to protect the matrix thread, greatly extending the service life of the matrix. It is widely used in automotive, electronics, machinery, aerospace, and other fields.

Working principle of Stainless Steel Helical Inserts

The outer diameter of the stainless steel helical inserts in their state is more significant than that of their unique internal thread. The wrench thread guide ring is installed during assembly so that the steel wire screw sleeve is pre-compressed by torsion force and the outer diameter becomes smaller. After screwing in, the steel wire screw sleeve has the effect of expanding around, so it is firmly fixed in the threaded hole and will not move with the movement of the screw.

Stainless Steel Helical Inserts application industry

1. Assembly: Screw it into metal or non-metal material to form a high-strength, wear-resistance, interchangeable standard internal thread. The application of low-strength engineering materials such as aluminum, copper, titanium, magnesium alloy, plastic, and density board can significantly improve the strength and wear resistance; Applied to steel parts, stainless steel, and cast iron can enhance the durability of screws, prevent loose due to various vibration screws, fatigue fracture and improve the anti-fatigue strength of screw connection.

2. Maintenance: In the occurrence of thread processing errors or the repair of damaged thread holes, the use of wire screw sleeve as a means of repair can not increase the weight and volume, get economic maintenance, save important parts quickly and effectively repair to the original state, and still use the original specification of screws, to meet or exceed the actual design technical requirements.

3. Conversion: Using stainless steel helical inserts for metric → Imperial → unified thread and other series of thread holes to convert each other, which is very convenient, fast, economical, and suitable for import and export products.

The characteristic solution of Stainless Steel Helical Inserts

1. Stronger threads can be made on most materials. Increase the load-carrying capacity and fatigue strength of threaded links.

2. Wear resistance, corrosion resistance, heat resistance, and material saving.

3. Locking-type stainless steel helical inserts allow multiple disassembly without reducing thread torque and have high reusability.

(1) The materials and expected standards of the Stainless Steel Helical Inserts and the ordinary materials and application scenarios of the Stainless Steel Helical Inserts:

A . Stainless steel material: in light microstructure, aluminum alloy structure, seawater, chlorine-containing liquid, increased corrosion resistance to use.

B. Copper alloy material: Use when needed in situations such as conducting electricity or self-lubricating, requiring copper, or often adjusting the rotation of the threaded connection.

C.Superalloy material: the temperature at 500-750 ℃ heat resistant use. It is used for aerospace assembly technology, aircraft engines, and internal combustion engine turbine compressors operating at 750 ° C. Different materials have different characteristics and scope of application; you can choose the suitable material according to the specific application and needs, an industrial bear can also provide customers with non-standard customized products.

The typical standard of Stainless Steel Helical Inserts:

(2) Steel wire screw sleeve classification

1) Classified according to the function of the wire screw sleeve

A. Ordinary Stainless Steel Helical Inserts (Free-Running Inserts) mark "FR"

B. Lock-type Stainless Steel Helical Inserts (Stainless Steel Helical Inserts) mark "SL"

Ordinary Stainless Steel Helical Inserts are divided into Stainless Steel Helical Inserts with breaking grooves and Stainless Steel Helical Inserts without breaking grooves (generally known as tailless wire screw sleeves).

A circle or several circles in the body of the locking-type Stainless Steel Helical Inserts is made of the polygon, and the Stainless Steel Helical Inserts are screwed into the screw hole. In addition to using its elastic force, it is fixed in the screw hole, and the friction between the edge of the polygon and the corresponding screw thread is used to lock the screw.

2) Classified according to the direction of the wire screw sleeve

A. Right-hand Stainless Steel Helical Inserts

B. Left-handed Stainless Steel Helical Inserts

3) According to the Stainless Steel Helical Inserts, the mounting handle can be divided into:

A. Install the handle Stainless Steel Helical Inserts

B. Stainless Steel Helical Inserts without mounting handle (B1 tailless screw sleeve, B2 taper screw sleeve)

Supplement: Stainless Steel Helical Inserts without mounting handles have been developed for blind hole characteristics, and taper screw sleeves for blind holes. The Stainless Steel Helical Inserts are threaded into the screw hole only by matching the cone shape of the end of the Stainless Steel Helical Inserts with a threaded cone mounting core. The handless Stainless Steel Helical Inserts have grooves at both ends, which can be used for screwing in and screwing out.

4) Classified according to the surface treatment of the Stainless Steel Helical Inserts

A.No surface treatment wire screw sleeve

B.Dyed steel wire screw sleeve

C. Coated steel wire sheath (steel wire sheath can also be used for surface coating treatment, such as copper plating, silver plating, galvanization, etc., to prevent bite.)

Selection of Stainless Steel Helical Inserts

After the designer determines the thread specification, the length of the Stainless Steel Helical Inserts after installation is determined according to the material strength of the body and the screw strength. The purpose is that after installation, the internal thread does not break, and the matrix, the Stainless Steel Helical Inserts, and the screw achieve a good strength match. The relevant standards stipulate that the number of free-states determines the length of the Stainless Steel Helical Insert turns, and the number of whole turns is generally selected.

The representation is 1d or 1.5d.

The general marking method of the Stainless Steel Helical Inserts is:

D (diameter) ×P (pitch) ×N (number of wire screw rings in a free state)

(Note: This is the marking method of GJB and HB; not all standards are used for method marking. Please refer to the corresponding standards for the exact process.)

Specification method:

②    FR(common type)Md (diameter) ×P(pitch)-and

②SL(locking type)Md (diameter) ×P(pitch)-and

Stainless Steel Helical Inserts installation solution

1. Drilling: Before tapping the thread of the general Stainless Steel Helical Inserts, the drilling diameter should meet the requirements of the inner diameter after the thread.

Recommended drill diameter

2. Tapping: The tap for the internal thread processing the Stainless Steel Helical Inserts must be unique. Tap specifications plus ST.

3. Detection: After processing the internal thread installed in the Stainless Steel Helical Inserts, the unique thread plug gauge is applied to check according to the actual needs.

4. Assembly: Stainless Steel Helical Inserts into the screw hole of the installation. Stainless Steel Helical Inserts must be a unique tool. Tools generally have hand tools and power tools.

5. Handle: The mounting handle is specially used to screw the Stainless Steel Helical Inserts into the screw hole. After the Stainless Steel Helical Inserts are screwed into the screw hole, the mounting handle becomes excess. It may even affect the screw to pass under the Stainless Steel Helical Inserts, so the mounting handle should be removed when the screw may exceed the end of the Stainless Steel Helical Inserts.

6. Detection: After installing the stainless steel helical inserts, the standard thread plug gauge is also used to check the accuracy of the holes.

7. Take out: After the Stainless Steel Helical Inserts are screwed into the screw hole when the screw hole needs to be taken out due to improper installation or other quality problems, the exit tool should be used. Detection and application scenarios of stainless steel helical Inserts.

Stainless Steel Helical Inserts inspection solution

1. Check the appearance, surface defects, roughness, clearance, and number of turns of the stainless steel helical Inserts.

Surface defects refer to burrs, indentation, lamination, cracks, etc., which affect the use of the machine. Generally, this can be found by direct observation. If necessary, roughness templates and feelers or projectors can also be used to check the roughness and clearance of the stainless steel helical inserts.

2. The free outer diameter size, mounting handle length, guide size, break slot size, etc., can be checked with calipers or microscopes. Generally, the appropriate measurement position is necessary. Otherwise, the conclusion will be inconsistent with reality.

3. The unique gauge of the stainless steel helical inserts can generally detect the precision of the thread of the stainless steel helical inserts.

Stainless steel helical inserts application scenario solution

1. Automobile maintenance: mainly used for spark plug and general screw hole maintenance.

2. Machine maintenance: To prevent costly machines from being able to be used generally due to damage to screw holes.

3. Accessories manufacturing: Because the threaded sheath can produce more superior threads in a variety of materials, resulting in a larger load capacity, it is used in the manufacturing of a variety of key equipment, such as electronics, automotive, aerospace, plastics, and other industries if you are looking for high-quality steel helical inserts and fasteners or technical support for structural design, you are, please get in touch with me. Thanks.Email:adelajonly@gmail.com