This is a ready-to-ship collection of zinc plated stamped brackets and clips, produced on 20 CNC presses at our Dongguan factory. You get a consistent Rockwell hardness of HRC 40-4
This is a ready-to-ship collection of zinc plated stamped brackets and clips, produced on 20 CNC presses at our Dongguan factory. You get a consistent Rockwell hardness of HRC 40-45, dimensional toler
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This is a ready-to-ship collection of zinc plated stamped brackets and clips, produced on 20 CNC presses at our Dongguan factory. You get a consistent Rockwell hardness of HRC 40-45, dimensional tolerance of ±0.05mm, and a surface finish of Ra 1.6µm, with standard orders leaving our dock in 15 days. These parts are for engineers who need corrosion-resistant mounting and fastening components without waiting on a custom run.
Why Zinc Plating Extends Service Life in Humid or Outdoor Assemblies
Zinc plating gives a sacrificial layer that corrodes before the underlying SPCC steel does. Our clear trivalent passivation adds 72 hours of neutral salt spray resistance per ASTM B117. That means your bracket survives in a 40°C, 85% RH environment for five years without red rust. For automotive underhood clips, we can upgrade to yellow zinc for 120 hours of salt spray—just specify on your drawing.
Press Tolerances and Burr Control on Every Clip Edge
We run progressive dies with a fixed punch-to-die clearance of 5% of material thickness. This holds stamped hole positions to ±0.05mm and keeps burr height under 0.08mm on the cut edges. For clips that snap onto sheet metal edges, we add a coining step to flatten the bend radius to 0.2mm, preventing stress cracks. Every part is checked with a CMM and optical comparator before packing.
Materials We Stock for Immediate Stamping Runs
The collection covers five base materials, all in coil form and ready for the press. SPCC cold-rolled steel in 0.5mm to 3.0mm thickness for general brackets. SUS304 stainless for corrosion-heavy marine clips. 65Mn spring steel for locking clips requiring elastic return. C2600 brass for electrical grounding clips. And 5052 aluminum for lightweight heat sink mounting brackets. Material certs are included with each lot.
Hardness and Spring-Back Compensation in Forming Dies
For 65Mn spring steel clips, we temper to HRC 42 and pre-set the bending angle to 92° to compensate for 2° of spring-back. This ensures the clip’s gripping force stays between 15N and 20N after repeated flexing. Our tool room uses finite element analysis to predict spring-back for every new bend, so you don’t get loose or over-tight clips. Hardness is verified with a Rockwell tester on every 500th piece.
Surface Finish Ra 1.6µm and Zero Oil Residue After Plating
After stamping, parts go through a three-stage wash: alkaline degreasing, reverse osmosis rinse, and hot air drying. Zinc plating is applied in a barrel process at 8-12µm thickness, measured with an X-ray fluoroscope. We skip post-plating oiling unless you request it, because oily residue collects dust and interferes with adhesive bonding. Ra 1.6µm finish is standard, but we can polish to Ra 0.8µm for visible exterior brackets.
Inspection Before Every Shipment: CMM, Salt Spray, and Pull Tests
Each lot gets a first-article inspection on a Zeiss CMM, checking 12 critical dimensions. A salt spray test per ASTM B117 runs for 72 hours on a sample from every plating batch. For spring clips, we perform a 10,000-cycle flex test to confirm no fatigue fracture. Finally, a visual check under 2x magnification rejects any part with plating skips or scratches. The inspection report ships with your box.
Packaging That Prevents Zinc Scratches During Transit
Brackets are nested in compartmentalized corrugated trays, not thrown loose in a bag. Clips are tumbled to remove sharp edges, then packed in anti-static zip-lock bags of 100 pieces each. The outer carton is double-wall, 32 ECT rated, with a moisture barrier film inside. This keeps the zinc surface untouched until you open the box on your line.
Specification
Value
Base materials
SPCC, SUS304, 65Mn, C2600, 5052
Thickness range
0.5mm – 3.0mm
Hardness (65Mn)
HRC 40 – 45
Dimensional tolerance
±0.05mm
Hole position tolerance
±0.05mm
Surface finish
Ra 1.6µm (Ra 0.8µm optional)
Burr height
≤0.08mm
Zinc plating thickness
8 – 12µm, clear or yellow
Salt spray resistance
72 hours (clear), 120 hours (yellow)
Lead time (standard)
15 days
MOQ
No MOQ – order 1 piece or 100k
How to Choose Between a Bracket and a Clip for Your Assembly
Use a bracket when you need a rigid mounting point with bolt holes—our SPCC brackets handle static loads up to 200kg. Use a clip when you need quick snap-in retention or serviceability—our 65Mn clips withstand 10,000 insertion cycles. For both, the zinc plating prevents galvanic corrosion when mated with aluminum frames. If you are unsure, send your assembly drawing and we will recommend the right part.
What is the minimum order quantity for this collection?
There is no MOQ—you can order a single bracket for prototyping or 100,000 pieces for production at the same unit price break.
Can you modify a standard bracket or clip design?
Yes, we adjust hole patterns, bend angles, and plating thickness based on your drawing, with tooling modification costs quoted before any work begins.
How do you guarantee the zinc plating does not flake on sharp edges?
We round all cut edges to a 0.2mm minimum radius in the die, and the barrel plating process deposits a uniform 8-12µm layer even on these radii.
What is the actual lead time if I need 5,000 pieces?
For any quantity up to 50,000 pieces, the lead time is 15 days from drawing approval, plus 3 days for zinc plating and 2 days for inspection.
Get a Firm Quote and DFM Feedback Within 12 Hours
Send your 2D drawing (PDF, DWG, or STEP) to our engineering team, and we will return a firm price, tooling cost if needed, and a DFM report on any risky features. For standard parts from this collection, we also send stock availability and a sample photo. Email sc@bquq.com or WhatsApp +86 13713157787 with the subject “Zinc Bracket Quote.” For material selection help, read our CNC cutting tool selection guide and for tighter tolerances, see the CNC machining tolerances guide. We reply within 12 hours, every time.
