Double-Section Straight-Knurled Steel Embedded Nut with Center Groove

Product Specifications

Part Number	YY00180
Material	Iron
Surface Treatment	Natural finish
Outer Diameter	8 mm
Total Length	12 mm
Thread	M4
Process	Machining
Knurl Type	Two sections of straight knurling, with a central groove
Price	Please contact us for current pricing.
Part Number	YY00181
Material	Iron
Surface Treatment	Natural finish
Outer Diameter	9 mm
Total Length	10 mm
Thread	M5
Process	Machining
Knurl Type	Two sections of straight knurling, with a central groove
Price	Please contact us for current pricing.
Part Number	YY00183
Material	Iron
Surface Treatment	Natural finish
Outer Diameter	10 mm
Total Length	11 mm
Thread	M6
Process	Machining
Knurl Type	Two sections of straight knurling, with a central groove
Price	Please contact us for current pricing.
Customization	Non-standard outer diameter, length, thread size, groove dimensions, and knurl pattern are available upon request, including production from drawings or samples.

Core Advantages

• Double-section straight knurling: Two knurled bands increase the contact area with the plastic and provide separate engagement zones within the thermoplastic.
• Central groove: The groove separates the two knurled sections and can accommodate a matching feature in the molded hole, supporting positioning during installation.
• Anti-pull-out geometry: The knurled sections create mechanical interlock with the plastic after molding, heat staking, or press-fit.
• Iron construction: Iron provides mechanical strength for applications subject to tightening torque and load.
• Natural finish: The untreated surface suits applications where no additional coating is required, and where the base material properties are used directly.
• Three standard sizes: The range covers M4, M5, and M6 internal threads with outer diameters from 8 mm to 10 mm.
• Drawing and sample based customization: Non-standard dimensions and thread configurations can be produced from customer drawings or samples.

Product Features

• Two sections of straight knurling along the body, with a central groove.
• Three standard sizes: 8 mm by 12 mm with M4; 9 mm by 10 mm with M5; 10 mm by 11 mm with M6.
• Machined iron body with consistent dimensional tolerance.
• Internal metric thread produced to standard pitch.
• Natural finish without additional surface treatment.
• Suitable for insert molding, heat staking, press-fit, and ultrasonic insertion.
• Can be produced to customer drawings or samples for non-standard dimensions and groove geometry.

Applications

• Consumer electronics housings and enclosures
• Home appliance plastic components
• Automotive interior plastic components
• Industrial control panels and instrument casings
• Power tool and equipment 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 groove?
A: The groove separates the two knurled sections and can accommodate a matching feature in the molded hole. This supports positioning during installation and provides a defined transition between the two knurled bands.

Q2: How are these inserts installed?
A: They can be installed by insert molding, heat staking, press-fit, or ultrasonic insertion, 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: How do I select between the three sizes?
A: Selection depends on the required thread size, boss wall thickness, and load requirements. The 8 mm by 12 mm size with M4 suits compact bosses; the 9 mm by 10 mm size with M5 suits medium bosses; the 10 mm by 11 mm size with M6 suits larger bosses and higher load requirements.

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

Precautions

• Confirm the molded hole diameter, groove 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.
• Iron without surface treatment is subject to oxidation; store in a dry environment and apply surface protection where required.
• 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 embedded nuts can be produced according to customer drawings or samples. Customization options include outer diameter, length, thread size, groove dimensions, knurl type, material, surface treatment, and chamfer. Please contact us with your specifications and application details for a quotation.

Details