High-Precision Brass Embedded Nut with Straight Knurling on Both Ends

Product Specifications

Material	Brass
Surface Treatment	Cleaning
Outer Diameter	4.2 mm
Total Length	7.0 mm
Thread	M2.5
Process	CNC turning
Knurl Type	Straight knurling on both ends, with a smooth stepped shank in the middle
Price	Please contact us for current pricing.
Customization	Non-standard outer diameter, length, thread size, knurl pattern, and shank geometry are available upon request.

Core Advantages

• Double-end straight knurling: Two knurled bands increase the contact area with the plastic and resist rotational movement under torque.
• Central plain stepped shank: The smooth section between the knurls allows the insert to seat against a stepped molded hole, supporting axial positioning during installation.
• CNC turning: The machining process holds consistent dimensional tolerance on outer diameter, length, and thread.
• Brass construction: Brass offers thermal conductivity and corrosion resistance in typical indoor environments, and is compatible with common molding and heat-staking processes.
• Anti-pull-out geometry: The knurled bands create mechanical interlock with the plastic after molding or heat staking.
• Cleaned surface: The cleaning treatment removes machining residue and prepares the surface for consistent insertion behavior.
• M2.5 internal thread: Suits small fasteners used in compact electronic and precision assemblies.
• Customizable shank: The stepped plain section can be adjusted in diameter and length to match specific boss designs.

Product Features

• Straight knurl on both ends, with a smooth central shank between the knurled bands.
• Stepped shank profile for seating in molded holes with a matching step.
• Machined brass body with consistent dimensional tolerance.
• Internal M2.5 metric thread produced to standard pitch.
• Outer diameter of 4.2 mm and total length of 7.0 mm.
• Surface cleaning treatment for removal of cutting fluid and fine particles.
• Suitable for insert molding, heat staking, ultrasonic insertion, and press-fit.
• Can be produced to customer drawings for non-standard dimensions and shank geometry.

Applications

• Consumer electronics housings and enclosures
• Small electronic device casings
• Automotive interior plastic components
• Industrial control panels and instrument casings
• Medical device plastic housings
• Telecommunications equipment
• Prototype and low-volume molded assemblies
• Thermoplastic parts requiring repeated fastening and disassembly

FAQ and Solutions

Q1: What is the function of the central plain stepped shank?
A: The smooth section separates the two knurled bands and provides a seating surface against a stepped molded hole. This supports axial positioning and reduces stress concentration at the knurl edges during installation.

Q2: How is this insert installed?
A: It can be installed by insert molding, heat staking, ultrasonic insertion, or press-fit, depending on the plastic type and wall thickness. Heat staking is commonly used for thermoplastics because the melted plastic flows into the knurl and resets around it.

Q3: Can the outer diameter, length, or thread be customized?
A: Yes. Outer diameter, total length, thread size, knurl pattern, and shank geometry can be produced to customer drawings or samples.

Q4: What information is needed for a custom quote?
A: Please provide outer diameter, total length, thread size, knurl type, shank dimensions, material, surface treatment, quantity, and any drawing or tolerance requirements.

Precautions

Confirm the molded hole diameter, step dimensions, and boss wall thickness before installation.
Use installation parameters recommended for the specific plastic material.
Avoid excessive heat during heat staking, which can deform the surrounding plastic.
Store in a dry environment to limit surface oxidation.
Verify thread compatibility with the mating screw before assembly.
For high-torque applications, test the insert in the actual plastic to confirm performance.

Customization and Ordering

Non-standard brass embedded nuts can be produced according to customer drawings or samples. Customization options include outer diameter, length, thread size, knurl type, shank geometry, chamfer, and surface treatment. Please contact us with your specifications and application details for a quotation.

Details