What This Collection Actually Is — And Why Engineers Order It This is a ready-to-spec family of stamped brackets and clips, all zinc plated for corrosion resistance (salt spray tested to 72 hours mi
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What This Collection Actually Is — And Why Engineers Order It This is a ready-to-spec family of stamped brackets and clips, all zinc plated for corrosion resistance (salt spray tested to 72 hours mi
This is a ready-to-spec family of stamped brackets and clips, all zinc plated for corrosion resistance (salt spray tested to 72 hours minimum). You get flatness within 0.05 mm and hole-to-hole tolerances at ±0.05 mm, with burr height controlled under 0.05 mm on every edge. Typical lead time is 15 days from drawing approval to first article, and our in-house hardness range for spring steel clips is 40–45 HRC after heat treatment.
Thin material (0.5–3.0 mm) wants to warp. We counter that with progressive dies running on 80-ton high-speed presses (250 SPM), followed by a straightening pass on every strip. Our die maintenance schedule is every 50,000 strokes — not “when it breaks.” That keeps dimensional drift below 0.03 mm across a production run. For clips with spring-back issues, we use coining steps in the die rather than trying to bend after stamping.
Three base metals cover 95% of our orders: SPCC cold-rolled steel (for general brackets), SUS301 stainless (for corrosive or high-temp environments), and SK5 spring steel (for clips that must snap back 1 million cycles). Zinc plating is applied after heat treatment — never before — because plating baths at 45°C can temper martensite if done backwards. For SK5, we oil-quench at 830°C, temper at 260°C for 45 minutes, then plate to a thickness of 8–12 µm.
No random sampling. Every lot gets a 5-point check: (1) CMM verification of 3 critical hole positions per part, (2) Rockwell hardness test on 2 sample clips per batch, (3) salt spray test on one plated sample per production day, (4) burr height gauge on 10 random pieces, (5) flatness check on a granite surface plate. Results are shipped with the packing list — you don’t have to ask for them.
Our standard is trivalent clear or blue zinc, 8–12 µm, per ASTM B633. It gives 72 hours to white rust and 240 hours to red rust in neutral salt spray. We avoid hexavalent chromate because it’s banned under RoHS and REACH — if your application needs automotive-grade (e.g., 120 hours white rust), we can add a sealer or go to zinc-nickel alloy (12–20 µm) at a 5% cost increase.
Clips in this collection are either formed from SK5 or from 65Mn (manganese spring steel). The difference is fatigue life: 65Mn gives 1 million cycles at 70% of yield stress; SK5 gives 1.5 million. We stress-relieve after forming at 200°C for 30 minutes — this removes residual stress from the bending operation, which is what actually causes premature cracking. If you need a specific cycle count, tell us; we’ll select the grade and temper accordingly.
You can order 50 pieces to test fitment — we do that for every new customer. Prototype parts (up to 200 pieces) are run on a single-station die, which costs $80–$200 tooling per part geometry. Production runs (over 1,000 pieces) use progressive dies with a one-time engineering charge of $1,200–$3,500, amortized into your unit price. If you keep the same design for 12 months, we refund 50% of that tooling charge on your 5th order.
| Parameter | Value / Range | Notes |
|---|---|---|
| Base materials | SPCC, SUS301, SK5, 65Mn | Other alloys on request |
| Material thickness | 0.5 – 3.0 mm | Thicker up to 5.0 mm for brackets |
| Hardness (spring clips) | 40 – 45 HRC | SK5 / 65Mn after quench & temper |
| Hardness (brackets) | As-formed, 70 – 80 HRB | Optional induction hardening |
| Dimensional tolerance | ±0.05 mm | Holes and mounting faces |
| Surface finish (Ra) | 0.8 – 1.6 µm | After plating, no secondary polish |
| Runout (flatness) | ≤ 0.05 mm over 100 mm length | Measured on granite plate |
| Zinc plating thickness | 8 – 12 µm (trivalent) | ASTM B633, clear or blue |
| Salt spray resistance | 72 h white / 240 h red | Optional zinc-nickel for 120 h white |
| Lead time (first article) | 15 days | After drawing approval |
| MOQ | No MOQ (50 pcs for prototype) | Production pricing at 1,000+ |
No MOQ — we accept 50 pieces for prototyping and scale up to your volume without minimums, though unit pricing drops significantly above 1,000 pieces.
Yes, every bracket and clip is made from your drawing — we modify existing dies or make new ones at $80–$200 for single-station prototypes.
We run a 5-point inspection on every lot (CMM, hardness, salt spray, burr gauge, flatness) and include the report with your shipment.
First article in 15 days, production quantities of 5,000 pieces in 20 days, and repeat orders in 10–12 days once tooling is proven.
Before you finalize your part design, check our CNC cutting tool selection guide — it covers edge quality on stamped parts that interface with machined components. And for dimensional decisions, our CNC machining tolerances guide explains what ±0.05 mm actually costs in tooling and cycle time.
This Zinc Plated Stamped Brackets Clips Collection is precision manufacturing from our Dongguan factory, made in China with export experience to 27 countries. Send your drawing for a firm quote within 12 hours — email sc@bquq.com or WhatsApp +86 13713157787. We’ll reply with a unit price, tooling cost, and delivery date, no obligation.
| Parameter | Capability |
|---|---|
| Materials | SPCC, SGCC, SUS301/304/316, brass, copper, beryllium copper, phosphor bronze |
| Process | Progressive die stamping, fine blanking, deep drawing, bending, tapping |
| Tolerance | ±0.01mm standard, ±0.005mm on request |
| Surface | Zinc plating, nickel, tin, gold, powder coating, passivation, anodizing |
| Die Size | Up to 1200 x 800 mm, 16-250 ton presses |
| Thickness | 0.05 - 6.0 mm sheet metal, wire 0.1 - 8.0 mm |
| Prototype | 7-15 days tooling, no MOQ on samples |
| Inspection | Full report per batch, CMM and optical measurement |
