High-Precision Stepped Knurled Brass Insert Nut

Product Specifications

Material	Brass
Surface Treatment	Cleaning
Outer Diameter	7.2 mm
Total Length	12.9 mm
Thread	M5
Process	CNC turning
Profile	Stepped body with knurling
Price	Please contact us for current pricing.
Customization	Non-standard outer diameter, length, thread size, step dimensions, and knurl pattern are available upon request.

Core Advantages

• Stepped profile: The step geometry allows the insert to seat against a matching stepped molded hole and supports axial positioning during installation.
• Knurled body: The knurl pattern engages the plastic and resists rotational movement under torque.
• Anti-pull-out geometry: The knurled section creates mechanical interlock with the plastic after molding or heat staking.
• CNC turning: The machining process holds consistent dimensional tolerance on outer diameter, length, step dimensions, 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.
• Cleaned surface: The cleaning treatment removes machining residue and prepares the surface for consistent insertion behavior.
• M5 internal thread: Suits fasteners used in medium-size housings and plastic parts.
• Extended length: The 12.9 mm total length suits deeper bosses and provides a longer thread engagement depth.

Product Features

• Stepped body with knurling along the insert.
• Step profile for seating in molded holes with a matching step.
• Machined brass body with consistent dimensional tolerance.
• Internal M5 metric thread produced to standard pitch.
• Outer diameter of 7.2 mm and total length of 12.9 mm.
• Cleaning surface 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 step geometry.

Applications

• Consumer electronics housings and enclosures
• Home appliance plastic components
• 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 stepped profile?
A: The step geometry allows the insert to seat against a matching stepped molded hole. This supports axial positioning during installation and provides a defined contact face within the boss.

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, step dimensions, and knurl pattern 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, step dimensions, knurl type, 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, step dimensions, knurl type, material, surface treatment, and chamfer. Please contact us with your specifications and application details for a quotation.

Details