Terminals and connectors
Current-carrying terminals, tabs and connector parts, stamped from strip.
For switchgear, breakers and wiring devices
Custom sheet metal stampings, made to your drawing.
Progressive-die and multi-slide stamped parts in copper, copper alloys and mild steel. Manufactured in India, plated and inspected against your drawing, and delivered to your Incoterm.
- Copper alloys or mild steel
- Plated or zinc coated
- Measured records
Stamped terminal, 1.0 mm, tin platedDWG REV. D
- Material
- ETP copper C11000, half-hard
- Plating
- Tin, ASTM B545
- Critical dimension
- Hole position 12.00 ±0.05 mm
- Inspection
- Burr height measured
What we make
Contact carriers
Stamped arms and carriers that hold the contact tip, ready for riveting or welding.
For breakers, contactors and relays
Spring contacts and clips
Formed parts that hold contact force over many cycles, in spring tempers.
For plug-in connections and retaining clips
Terminal block parts
Clamp yokes, frames and screw clamps in zinc-plated mild steel, with copper or brass current bars.
For DIN rail terminal blocks and wiring devices
Multi-slide formed parts
Parts bent in several directions in one cycle, from strip or wire.
For small parts with many bends
Stamped sub-assemblies
Stampings riveted, welded or moulded with other parts, and delivered as one part.
For fewer incoming parts on your line
Choosing a process
Shape and volume decide the tool. Material and temper decide how the part performs.
Tooling for the shape and volume
- Progressive die
- Strip runs through a series of stations, and every press stroke finishes a part.Watch for: Tooling cost pays back at volume.
- Multi-slide
- Forms bends in several directions in one cycle.Watch for: Best for small parts with many bends.
- Laser cut and formed
- No tooling, for prototypes and small batches.Watch for: Costs more per part than a die.
Edge and finish for the assembly
- Burr height
- The rough edge left by the punch, held to the limit on your drawing.Watch for: Rises as tools wear; it must be measured, not assumed.
- Deburring
- Tumbling or brushing to remove burrs and round edges.Watch for: Say which edges must stay sharp.
- Plating
- Tin, nickel or silver on copper alloys, before or after stamping.Watch for: Pre-plated strip leaves bare cut edges.
- Zinc
- Zinc plating with passivation, for mild steel parts.Watch for: Specify trivalent passivation; hexavalent chromium is restricted under RoHS.
Specifications
- Types
- Terminals and connectors, contact carriers, spring contacts and clips, terminal block parts, multi-slide formed parts, stamped sub-assemblies
- Materials
- ETP copper C11000; brass (CuZn37, CW508L); phosphor bronze (CuSn6, CW452K); mild steel DC01 / CRCA
- Thickness
- 0.2–6 mm standard
- Processes
- Progressive die, multi-slide, laser cutting and forming
- Plating
- Tin, nickel or silver on copper alloys; zinc with passivation on steel
- Checks
- Burr height and edge quality to the drawing; material grade and temper; plating thickness
- Standards
- Dimensions to your drawing; material grade and temper to your specification
- Quantities
- Prototype parts to high-volume production
Copper alloys or mild steel
Copper alloys carry the current. Mild steel holds, clamps and mounts. Choose for what the part has to do.
ETP copperBrassPhosphor bronze
Conductivity: typical values for annealed copper alloys, from Copper Development Association alloy data.
100% IACS
28% IACS
15% IACS
- ETP copper
- Highest conductivity, for parts that carry the main current. Soft, so it holds little spring force.
- Brass
- Easy to stamp, form and plate, at a lower metal cost than copper. For terminals that carry modest current.
- Phosphor bronze
- Holds spring force over many cycles. For spring contacts and clips, where force matters more than conductivity.
- Mild steel
- Strong and low cost, for clamp yokes, frames, brackets and mounting parts that do not carry the main current. Zinc plated against corrosion.
Questions buyers ask
What is progressive die stamping?+
Metal strip is fed through a die with a series of stations. Each station pierces, notches, bends or forms one feature, and the last station cuts the finished part free, so every press stroke produces a part.
What is burr height, and why does it matter?+
Burr height is the height of the rough edge left by the punch. A high burr stops a part seating in its assembly and can cut insulation. It rises as tools wear, so we measure it and report it every batch.
Can you make parts before the tooling is built?+
Yes. Prototypes and small batches can be laser cut and formed with no tooling, so you can test the part before you commit to a die.
Can you match an existing stamping from another supplier?+
Yes. Send the drawing, and a sample if the drawing is incomplete. We tell you what can be held before we quote, then make samples for your approval.
Which parts are made from mild steel?+
Parts that hold, clamp or mount rather than carry current: terminal block clamp yokes and frames, brackets and mounting plates. They are zinc plated with passivation against corrosion.
Can you plate after stamping?+
Yes. Plating after stamping covers the cut edges. Plating the strip before stamping costs less but leaves the edges bare. Tell us which on your drawing.
Can you take a small order?+
Yes. Small, engineering-heavy batches are work we take, from prototype quantities upwards.
Send the drawing
Email us your enquiry at contact@qumek.com. We respond within 12 hrs.
Your enquiries are confidential with us and we proceed with manufacturing only after signing a NDA.
Need a DFM review, a prototype or a test plan before production? See the services.