Press fit pcb pins

Press fit pcb pins DEFAULT

Press-fit technology was developed to enable reliable electrical connections between terminal pins and PCBs without soldering. Press-fit connector pins are widely used today in the automotive sector.

Press-fit pins, which feature an elastic press-fit zone, are cold-welded to the PCB when they are pressed in. This achieves a reliable electrical connection that fulfills the high automotive requirements without the drawbacks of soldering.

The Dietze Group has a proven track record with manufacturing high-precision press-fit connector pins and is your ideal partner for stamped terminal pins (EloPin), as well as wire-based terminal pins (Elbik-X-Press). For wire-based press-fit terminals, our unique swaging machinery is employed.

Dietze Group / Elbik was the first company worldwide to qualify the EloPin 04-06 press-fit zone, which is used for miniaturized packages.

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About the productAbout the sector

Excellent Characteristics:

  • Proven and improved eye-of-the-needle design
  • Excellent electrical contact with the highest reliability
  • Low press-in force combined with high retention force and high mechanical stability
  • High elastic recovery
  • Good compensation for pitch tolerances
  • No nozzle effect
  • No tin chips during press-in process
  • Controlled tin displacement during press-in process
  • Gastight, corrosion-protected electrical connection
  • Low stress on the through-plated holes and the connected PCB traces
  • Suitable for engine compartment accessories with a temperature range of -40°C to +150°C
  • Tested according to and exceeding the standards of IEC 60352-5




Press-fit connector pin for stamped contacts.

Type EloPin 04-06EloPin 06-10EloPin 08-145
Press in force max. 49350100160
Press in force typical 4933865115
Retention force  min 493153040
Retention forc, typical 4932560135
Press Fit Zone surfaceSn 100 % matt plated on Ni
PCB surfaceCu + Sn chem.  or HAL
Through hole  Ø  for chem. Sn [mm]0,60 +/-0,051,04 +/-0,051,49 +/-0,05
Through hole  Ø  for HAL [mm]Not available1,0 +0,09/-0,061,45 +0,09/-0,06
PCB thickness [mm]1,00 / 1,501,501,50
Operational temperature range-40°C to +150°C
Press in speed [mm/min.]25
Push out speed [mm/min.]10


Press-fit connector pin for contacts made of wire.

TypeX-Press 04-06X-Press 06-10X-Press 08-145
Press in force max. 49350100200
Press in force typical 4934060150
Retention force  min 493205050
Retention forc, typical 493306580
Press Fit Zone surfaceSn 100 % matt plated on Ni
PCB surfaceCu + Sn chem. or HAL
Through hole  Ø  for chem. Sn [mm]0,60 +/-0,051,04 +/-0,051,49 +/-0,05
Through hole  Ø  for HAL [mm]Not available1,0 +0,09/-0,061,45 +0,09/-0,06
PCB thickness [mm]1,00 / 1,501,501,50
Operational temperature range-40°C to +150°C
Press in speed [mm/min.]25
Push out speed [mm/min.]10

Press-fit technology

Press-fit technology is a solder-free electrical-mechanical connection technology between component and circuit board. For this purpose, a press-fit pin is pressed into the through-hole plating of the circuit board. At the contact points between the pin and the hole wall, gas-tight zones are created by cold welding the contact materials.

As an alternative to THT or SMT soldering, the press-fit technology helps to avoid thermal stress and ensures a high level of reliability of the connection and (in the solid pin version) a high current carrying capacity.

Press-fit technology requires a low tolerance of the hole diameter and is therefore special production.

You should define an extra layer for press-fit technology and output this as an extra drilling program at Gerber export. ODB++ data contain the information automatically! If you would like to use our data import service (e.g. for EAGLE, KiCad, ...) please inform us of the relevant layer.

Advantages of press-fit technology:

  • High reliability of the connection with extremely low FIT value (Failure in Time)
  • No thermal stress on the connection components thanks to solderless assembly
  • High holding forces: pins make gas-tight contact in the metallized drill holes
  • Efficient assembly process: press-in process using a toggle lever or pneumatic press

For press-fit technology, please send us the manufacturer's data sheet together with your circuit board data and activate the "press-fit technology" option in our circuit board calculator. Press-fit should be defined in an extra layer. A tinned end surface is recommended for gold-plated pins (e.g. chemical tin, HAL lead-free).

  1. Cslb test locations
  2. Gold necrozma
  3. Bmw paint code 416

About press-fit terminals and pins


Press-Fit terminals

Press-Fit Connectors

Recent years have seen an increased use of solderless press-fit connectors in the assembly processes of devices with circuit boards. In contrast to conventional connectors that are soldered when they are attached to the board, press-fit connectors can be attached by simply press-fitting them, simplifying the production process. More specifically, it is possible to eliminate the solder application and reflow processes. The simplified solderless mounting process leads to the reduction of energy consumption, establishment of an eco-friendly production process,and significant reduction of production costs.

In addition, with the increasing social call to reduce harmful substances and environmentally damaging substances, all manufacturers, regardless of their specialties, are required to produce products that do not contain such substances.

Press-fit connectors provide solutions for production processes that meet the needs of the times.

The terminals (press-fit parts) of a press-fit connector are inserted into through-holes in the printed circuit board, where pressure is applied due to the deformation of the press-fit sections, causing contact between the holes and the terminals to pass electric current. In other words, the press-fit section of each terminal forms a tight fit with a through-hole in the printed circuit board due to the restoring force generated as a result of the elastic deformation at the time of press-fitting. This tight-fit state maintains the contact to allow electricity to pass through.

In order to achieve this state, the press-fitting machine is required to have enough power to insert the terminals. In most cases, when mounting a press-fit connector on a circuit board, the connector is lightly fitted into the board by hand before it is fully inserted and mounted using a connector press-fitting machine.A special press-fitting jig is also required to mount a press-fit connector onto a printed circuit board.

press-fit terminals

Solderless Connection with the Press- Fitting Technology

The solderless connection is a method of mounting a connector onto a circuit board. This mounting method involves press-fitting an elastic contact (which deforms when force is applied, and becomes restored when the force is released) called the compliant section or press-fit section into a through-hole in the printed circuit board to create an airtight (gastight) contact with the inside surface of the through-hole utilizing the deformation of the elastic section of the contact.

This technology, developed in the US, is not a novel one but a mature technology, which has been mainly used for the mounting of multipolar connectors on motherboards. Individual connector manufacturers created their own specific shapes for the compliant section to give elasticity to terminals and obtained patents. The terminals were provided with cut sections at which they would elastically deform.

Their advantage is that terminal pins, or the entire connector, can be replaced in the event of a problem such as the bending of a terminal after mounting (it is possible to insert a new terminal into the same through-hole up to three times or so under normal conditions).

It is essential to appropriately control the press-fitting force and to dimensionally control the drilled inside diameters and the plating thicknesses for the through-holes.

Example: A pin with an S-shaped press-fit sectionSquare-type press-fit terminal (S-shaped cross section) with a crushed portion in the middle

Square-type press-fit terminal (S-shaped cross section) with a crushed portion in the middle




Insertion Force and Retention Force

The following shows an example of insertion force and retention force with a printed circuit board for evaluation.

・Printed circuit board specifications

Board material: FR-4

Board thickness: 1.6 mm

Hole diameter: ø1.02 ± 0.05

Surface treatment: Gold flash plating on copper undercoat

・Terminal specifications

Material: Phosphor bronze square pin (square of side 0.64 mm)

Surface treatment: Tin reflow plating on nickel undercoat

Insertion Force and Retention Force (press-fit terminal)

Application of Press-Fitting Technology

Environmentally damaging substances or the use of lead-free solder can lead to non-negligible deterioration in solder reliability. In addition, there have emerged various issues, such as the necessity to avoid thermal shock to the chip components due to soldering heat and the need for automatic mounting. Reflecting these circumstances, press-fitting technology is applied, for example, to connections between automotive control system circuit boards such as those for onboard equipment, antilock braking systems, vehicle stability control, navigation systems, hybrid drive systems, and tire pressure monitoring systems.

Press-fitting technology, which enables easy removal of connectors and other such components, is also advantageous when it comes to compliance with the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in Europe. Accordingly, the application of this technology has also been expanded to conventional consumer products, including personal computers, servers, and multifunction printers.

Forms of Press-Fit Terminals

1)Press-fit terminal which is processed from a wire.

  • Press-fit terminal/Separate terminal (pin)
    1. Separate terminal (pin)
  • Press-fit terminal/End-to-end terminals (pins)
    2. End-to-end terminals (pins)
  • Press-fit terminal/Bandolier terminals (pins)
    3. Bandolier terminals (pins)

2)Press-fit terminal which is processed from metal strips.

  • Press-fit terminal/Center Carrier type press-fit terminal
    1.Center Carrier type
  • Press-fit terminal/One –side Carrier type press-fit terminal
    2. One –side Carrier type



Materials of Press-Fit Terminals

1) Applicable Printed Circuit Board Materials(designations and corresponding JIS standards)


FR-4.0 and FR-4.1: JIS C 6484:2005 (Base materials for printed circuits — Epoxide woven E-glass laminated sheet of defined flammability (vertical burning test))

<Explanation as to Printed Circuit Boards>

flame retardant grade

flame retardant grade

The FR (flame retardant) grade is an indicator of incombustibility of a copper-clad laminate, a structural component of a printed wiring board.

It is represented as “FR-X,” where X is a numeral between 1 and 6, and the most nonflammable grade is FR-6.

The printed wiring boards that are familiar to electronic equipment designers are FR-4 boards. This means that they are printed wiring boards that include copper-clad laminates graded as FR-4. FR-4 boards are copper-clad laminates with an ordinary level of heat resistance made using flame-retardant glass-cloth epoxy resin.

Copper-clad laminates graded as FR-5 may be used for printed wiring boards that require a higher level of heat resistance, such as those for automotive applications. Incidentally, new designations have been adopted in the revised UL standard, as follows:

- FR-4 products (Brominated flame-retardant products) changed to FR-4.0

- FR-4 products (Non-halogen flame-retardant products) changed to FR-4.1

2) Materials for Press-Fit Terminals (designations and corresponding JIS standards)


・Phosphor bronze

C5191W: JIS H 3270:2012 (Copper beryllium alloy, phosphor bronze and nickel silver rods, bars and wires)

C5212W: JIS H 3270:2012 (Copper beryllium alloy, phosphor bronze and nickel silver rods, bars and wires)

・ Copper-beryllium alloy

C1720W: JIS H 3270:2012 (Copper beryllium alloy, phosphor bronze and nickel silver rods, bars and wires)

・Corson copper alloy ; Cu-Ni-Si based (Corson alloy)

<Explanation as to Materials>

The material used needs to be elastic inside the through-hole in a printed circuit board. In other words, material with a high level of spring-like property is to be used. Material prices should also be considered.

When using beryllium alloy, it is necessary to consider the precipitation hardening treatment.

FINECS processes both metal strips and wire.
Please feel free to contact us.

Surface Treatment of Press-Fit Terminals

1) Tin reflow plating on nickel undercoat on wire

Ni: 1–1.5 µm + Sn: 1.5–2.5 µm (reflow plating)

2) Bandolier pins: It is also possible to apply gold plating to only the end portions of terminals.

Arrangement pitch: 2.0 mm, 2.54 mm (0.1"), 3.0 mm, etc.

<Recommended Through-Hole Specifications>

In addition to hot air leveling (HAL), the specifications listed below have become increasingly important. Based on different characteristics, such as mechanical strength and the coefficient of friction, we recommend the following through-hole specifications.

1.6mm以上 Thickness of the printed circuit board: 1.6 mm above

Specifications of Circuit Board Through-Holes

Specifications of Circuit Board  Through-Holes

Prepared hole diameter: 1.15 ± 0.025

Copper: 25 µm at the minimum

max.0.8µm Tin: 0.8 µm at the

Finishing diameter: 1.00–1.10 mm

Referential Standard

We have acquired reference data in connection with the standard mentioned below. For other tests, we ask that your company acquires the relevant data.

・IEC 60352-5:2012

Solderless connections

Part 5: Press-in connections –General requirement,test methods and


5.2. Mechanical tests Bending

Bending of 15 degrees (one up-and-down movement in both directions)

【Excerpt】press-fit terminal pin1 Contact resistance

The contact resistance shall be carried out in accordance with IEC 60512,test 2a.

Excerpt】press-fit terminal pin2

Requirements after mechanical, electrical or climatic conditioning:

a) Qualification test schedule: The maximum change of contact resistance

shall be less than 0.5mΩ for each test phase.

b) Application test schedule: The maximum change of contact resistance shall be specified in the component detail standard, if any, or in the manufacturer’s specification. Dry heat

The test shall be carried out in accordance with IEC 60512, test 11i.

- test temperature 105℃

- test duration 1,000 h

Appearances and Shapes of Press-Fit Terminals

We at FINECS recommend the following shapes:


Square-type press-fit terminal (S-shaped cross section) with a crushed portion in the middle

Square-type press-fit terminal (S-shaped cross section) with a crushed portion in the middle


Square-type press-fit terminal (S-shaped cross section) with a flange in the middle

Square-type press-fit terminal (S-shaped cross section) with a flange in the middle


Round-type press-fit terminal (S-shaped cross section) with a flange in the middle

Round-type press-fit terminal (S-shaped cross section) with a flange in the middle



Shapes other than the above are also available at the customer’s request. The pictures below show some examples of different shapes.

As specific press-fit configurations may be patented by other companies, it is necessary to check for patent infringement.

  • Boat-shaped press-fit terminal
  • H-shaped press-fit terminal
  • M-shaped press-fit terminal


Example : Application

Stackable connection

Solid-shape Press-fit connection using the Columnar Electrode.

Press-fit portion of the terminal side, is the corner post of the rectangle. It is used in press-fitted to the inner diameter of the other party of the Columnar Electrodes. The Columnar Electrode, leave soldered to the substrate. It can be used in the ceramic substrate or other. The Columnar Electrode functions similarly to the through-hole of the printed circuit board.


press-fit terminal,columnar electrode


FINECS can form press-fit pins into custom shapes as requested.

Press-Fitting Machines and Jigs

With early press-fitting machines for press-fit connectors, the connectors, which had been lightly fitted into the board, were positioned manually one by one and then fully inserted. In general, two types of press-fitting jigs are used: the upper jig and the lower jig. Each upper jig is shaped to be suited to the shape and direction of the press-fit connector to be inserted. The lower jig is made so that the circuit board will not be deformed by the pressure to insert the press-fit connector, and that any terminals of the press-fit connector will not be damaged when the terminals penetrate the through-holes of the circuit board and stick out of the lower surface of the board.

As a matter of fact, there are various shapes of press-fit connectors, and different press-fitting methods require different jigs for which setup changes are required. Therefore, it is necessary to standardize the methods for attaching and fastening jigs to the press-fitting machine.

FINECS’ Solutions

We at FINECS have been involved over many years in the production of heading parts, such as PGA terminal pins, connector terminals, diode terminals, and rivets; the production of various kinds of heading machines and automatic precision electronic components assembly machines; and the automated assembly of precision electronic components. Based on the accumulated experience and knowhow, we provide solutions for press-fit terminals and press-fitting machines.

At FINECS, we work on producing press-fit terminal pins using both metal strips and wire.

For details, please feel free to call your nearest FINECS sales office or contact us via the form on this website.


SKEDD - new solder-free connection technology for PCB's from Würth Elektronik ICS

Press-fit PCB Pins for Plated Through-Holes

Mill-Max has added to its diverse mix of press-fit pins for plated through-holes with six new offerings designed for applications where mechanical strength and/or power delivery are essential. These new PCB pins feature multi-faceted (polygon) geometries and are suitable for solderless PCB termination or for direct soldering to the board for those situations requiring it. 

When these pins are pressed into a plated through-hole the points (the major or circumscribed diameter) of the polygon are set or imbedded in the hole while the flat sides of the feature (minor or inscribed diameter) provide relief, allowing the remainder of the plated through-hole barrel to remain intact. The result is internal board layers are not disconnected when the pin is pressed in. With a properly specified hole size, the polygon shaped press-fit feature will allow the pin to be secured in the hole while maintaining continuity throughout all the layers of the PCB.

Mill-Max employs its machining expertise to manufacture either square or hexagon shaped press-fit features to suit a variety of hole sizes and assembly requirements. Square press-fit features normally leave a larger gap between the flat side of the feature and the hole, useful for solder flow and venting of gasses, while a hexagon feature will provide more interference and greater retention. You can find more information on this topic in our Application Note: Press-Fit Pins and Receptacles for Plated Through-Holes.


The pins featured in the table above are often used in applications with more demanding mechanical/electrical requirements such as power supplies, power converters and any device subject to blind mating or rough handling. They are typically staked into a PCB at the press-fit end and either soldered or plugged in at the pin end. The smallest pin diameter in the group is .040” while the largest is at .080”, typical sizes for DC-DC converters. These pins are suitable for high current applications, the limits of which depend on the temperature requirements and heat sinking abilities of the environment. The pin material is typically brass but for greater electrical conductivity and more efficient heat dissipation tellurium copper is also available.

Some of these pins include vent features to facilitate soldering. Vents may be located at the base of the body above the press-fit feature for press-fitting before soldering. This is sometimes preferred to control perpendicularity, to prevent float during the assembly process, to provide additional mechanical strength or for high current applications. When vents are located at the pin end, they are useful to end users of the device needing to solder the component to their board. Vents can be machined at both locations if the application requires it.

For more information use the links to the right for additional product details, to order a sample, or to find related products.

Need technical help or looking for a custom design? Use the form below to contact Mill-Max Technical Services.


Pins press fit pcb


SKEDD - new solder-free connection technology for PCB's from Würth Elektronik ICS


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