Copyright © 2026 Suzhou Weeda Precision Technology Co., Ltd. All Rights Reserved. Privacy Policy XML
Brass Knurled Nuts: Fit And Use
Brass round knurled nuts are precision fasteners for plastic injection molding, addressing the issue of plastic thread stripping. Unlike plain screws, these nuts with brass inserts lock permanently into housing, preventing back-out. Brass is chosen for its balance of machinability, corrosion resistance, and ductility, making it ideal for CNC turning services in this application.
Product Overview
Brass round knurled nuts sit at the intersection of precision machined parts and custom fasteners for plastic injection molding. They solve a problem every polymer engineer knows: a plain screw will strip a plastic thread in weeks, but a brass insert nut with a knurled shell locks permanently into the housing and never backs out.
01. Why Brass Beats Other Insert Metals
In our CNC turning services, we machine brass inserts because the alloy balances machinability, corrosion resistance, and enough ductility to seat without cracking thin-walled plastics. Steel inserts fracture acetal and nylon; brass does not. That single property is why automotive fasteners and OEM precision parts for consumer electronics almost universally call for brass.
The knurled outer profile—straight, angled, or diamond—multiplies the frictional surface between the nut and the bore. For high-volume production of custom hardware in sensor housings, this rotation resistance is the difference between a unit that survives months of vibration and one that fails in the field.
02. Tolerances and Press-Fit Requirements
Buyers regularly ask how tight the tolerance must be. Our quality control holds the knurled outer diameter to ±0.02 mm and the threaded bore to ±0.01 mm on every lot. For high precision custom fasteners in medical device housings we add material certification and 100 % dimensional inspection on each batch of custom CNC machined parts before release.
We run both metric and imperial threads, from 200-piece prototype batches of custom copper parts to 50,000-unit annual contracts under ODM custom hardware agreements. Standard knurled patterns ship in 7–10 business days after drawing sign-off.
03. Matching the Nut to Your Application
Three variables drive selection: resin type, bore geometry, and service temperature. Polyamide and acetal take cold press-fit; PPS and LCP need the insert pre-heated. Our engineering team reviews your CAD and sizes the knurl height and thread depth so the custom turned parts for electronics drop straight onto your assembly line without rework.
For robotics, telecom backplanes, and industrial bushing assemblies we offer flanged, thrust, and plain variants alongside precision ground shafts, custom locating pins, and stainless steel bushings—all precision turned parts cut on multi-axis lathes so your BOM stays under one supplier.
Whether you need a first-article run or a recurring purchase of custom metal components, send a drawing or sample. We quote within 48 hours and attach full inspection reports to every shipment.