Metal stamping

Precision metal stamping, from 1,000 pieces

Sierxi stamps small precision parts — EMI shielding cans, terminals, spring clips and brackets — on 13 high-speed presses from 60 to 250 tons in Suzhou, China. We hold ±0.02 mm on critical features, run progressive dies on 0.15–1.2 mm strip, and quote from 1,000 pieces with about 300,000 pieces of monthly capacity.

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High-speed stamping presses in the Sierxi factory, Suzhou

Capabilities at a glance

Presses	13 high-speed presses, 60–250 T
Largest bed	2800 × 920 mm
Tooling	Progressive (continuous) dies, single-hit dies
Materials in production	SUS304, A5052, C7701 nickel silver, SPCC, SGCC
Typical strip thickness	0.15–1.2 mm
Tolerance	±0.02 mm on critical dimensions
Minimum order	1,000 pcs
Capacity	About 300,000 pcs per month

Stamped EMI shielding cans, frames and covers made by Sierxi

Metal stamping

EMI shielding cans and frames

One-piece and two-piece board-level shields in nickel silver and steel.

Copper and brass stamped terminals and contacts

Metal stamping

Stamped terminals and electrical contacts

Copper-alloy terminals, lugs and contacts, loose or on carrier strip.

Metal stamping

Stamped spring clips and spring contacts

Flat springs, grounding fingers and battery contacts.

Coil-fed high-speed presses running progressive dies

Metal stamping

Progressive die stamping

Multi-station dies fed from coil for high-volume small parts.

Stamped steel mounting brackets made by Sierxi

Metal stamping

Custom stamped metal brackets

PCB, connector and mounting brackets stamped from steel, stainless and aluminium strip.

Formed metal cans and shells made by Sierxi

Metal stamping

Custom deep-drawn metal parts

Cups, cans, shells and small housings drawn from strip.

What we stamp

Our presses are set up for small, high-volume parts where flatness and burr control matter more than size: board-level shielding cans and frames, connector terminals, spring contacts, deep-drawn parts, keyboard plates and stamped brackets for electronics and automation equipment.

Deep-drawn cups, shells and housings are quoted per drawing; achievable draw depth and diameter depend on material, thickness and the number of draw stages, and are confirmed when we review your part.

We do not take large automotive body panels or structural stampings. Those need bigger presses, IATF 16949 and a different supply chain, and you will get a better price elsewhere.

Press line

Presses are fed from coil by servo and straightening feeders.
Model	Maker	Qty	Bed size
SNI-60	SEYI (Kunshan)	2	900 × 520 mm
OCP-110	Chin Fong (Taiwan)	1	1150 × 680 mm
SNI-110	SEYI (Kunshan)	6	1150 × 680 mm
SNS2-160	SEYI (Kunshan)	1	1850 × 760 mm
SNS2-200	SEYI (Kunshan)	1	2200 × 840 mm
SNS2-250	SEYI (Kunshan)	2	2800 × 920 mm

SEYI high-speed presses with coil feeders

Stamping, laser cutting or CNC machining?

The right process depends mostly on annual volume and part size. Stamping has the lowest unit cost but needs a die; laser cutting and bending need no hard tooling but cost more per piece; machining suits thick, 3D parts that cannot be formed from sheet.

Rule-of-thumb comparison; the crossover point depends on part geometry and is checked per drawing.
	Progressive-die stamping	Laser cut + bent sheet metal	CNC machining
Tooling	Die required, paid once	None	Fixtures only
Unit cost	Lowest at volume	Medium	Highest
Typical volume	Thousands to millions per year	One to a few thousand	One to a few thousand
Thickness	0.15–1.2 mm strip (our range)	Up to 20 mm sheet	Bar and plate
Repeatability	Very high, set by the die	High, set by machine program	High

Design rules for stamped parts

Most cost and quality problems in stamping are fixed at the drawing stage. These are typical rules of thumb for steel, stainless and copper alloys; we review every drawing against the actual material and temper before quoting the die.

Pierced hole diameter: at least the material thickness (t); for stainless steel, allow about 1.5 t
Hole-to-edge and hole-to-hole distance: about 1.5–2 t, otherwise the web distorts or the punch wears fast
Hole-to-bend distance: at least about 2 t plus the inside bend radius, or the hole pulls oval
Inside bend radius: about 1 t for mild steel, more for stainless and hard-temper copper alloys
Bend lines across the rolling direction allow tighter radii without cracking — mark grain direction if it matters
Add bend reliefs where a bend meets an edge, at least as wide as the material thickness
State burr direction and a maximum burr height; a common limit is about 10% of thickness
Apply ±0.02 mm only to features that need it; general dimensions can follow JIS B 0408 or ISO 2768

How tooling and MOQ work

Stamping is cheap per piece because the cost sits in the die. New progressive dies are built by our partner toolroom to our design review; the die belongs to you once paid for. Tooling cost and lead time depend on part size, number of stations and material, so we quote them per drawing.

The minimum order is 1,000 pieces, but stamping pays off at volume. If your annual quantity is a few hundred pieces, laser-cut and bent sheet metal is usually the cheaper route — we will tell you which one fits when we quote.

Secondary operations

Laser welding of stamped parts to frames and brackets (5 laser welders)
Insert molding of terminals on 180 T injection machines
Plating, powder coating, blackening and brushing through qualified finishing partners
Laser marking of part numbers, logos and QR codes

How stamped parts are inspected

We run an ISO 9001:2015 quality system. The first article from a new die is measured in full on a vision measuring system before release. Production lots are checked by AQL sampling, with automated optical inspection at 100% on features you mark as critical. A dimensional report and material certificates (mill test certificates) ship with every lot on request.

Vision measuring system checking a stamped part

What to send with a stamping RFQ

2D drawing (PDF) with tolerances, plus a 3D model (STEP) for formed parts
Material grade, temper and thickness — JIS, ASTM, EN or GB designations are all fine
Plating or finish, including thickness and any selective-plating areas
Annual volume and typical release quantity, which decide the die design
Critical-to-function dimensions and how they are measured
Packing requirement: bulk, trays, reel or carrier strip, and destination country

Frequently asked questions

What is your minimum order for stamped parts?

We quote from 1,000 pieces. Below that, tooling cost usually outweighs the unit-price saving, and we will suggest laser cutting and bending instead.

Who owns the stamping die?

You do, once the tooling invoice is paid. We keep and maintain it at our factory for your repeat orders.

What tolerance can you hold on stamped parts?

We hold ±0.02 mm on critical dimensions and verify them on a vision measuring system. Non-critical dimensions follow your drawing or JIS B 0408 general tolerances.

What material thickness can you stamp?

Our production range is 0.15–1.2 mm strip, fed from coil. Materials in regular production include SUS304, A5052, C7701 nickel silver, SPCC and SGCC; other grades are quoted on request.

How much do samples cost and how long do they take?

Sample cost and lead time depend on whether a die is needed and are confirmed per project in the quote. Payment terms are also confirmed in the quote.

Do you make automotive stampings?

No. We are ISO 9001 certified, not IATF 16949, and we focus on electronics and industrial parts.

Metal stamping