2.54mm Machined Round Pin Female Header Socket Dual Row 2x20 Precision Turned Gold Plated

Dual row machined sockets are the workhorse of any lab that accepts boards back for retest. Two rows of twenty turned brass sleeves give forty contacts with the mechanical memory of a machined cage rather than a stamped spring, so insertion force stays predictable after hundreds of mating cycles. The PPS insulator holds the 2.54mm dual row geometry under clamping pressure, which matters because these sockets usually live inside fixtures that are bolted down and never opened during a test run.

Each sleeve is machined on a Swiss lathe with a six finger internal cage, so round and square posts are both gripped on their full circumference. Gold plating of 0.76 micron over a 2.5 micron nickel barrier keeps contact resistance near 10 milliohms and blocks the diffusion that quietly raises resistance on thin flash coatings. Withdrawal force is specified separately from insertion force, which lets fixture designers size the extraction tooling correctly.

• Machined dual row cages: Forty turned brass sleeves grip round and square posts around the full circumference for stable contact force.
• 0.76 micron gold over nickel: A 2.5 micron barrier blocks diffusion, keeping resistance near 10 milliohms across the service life.
• PPS insulator: Resists 260 C soldering and continuous 125 C operation without the creep that loosens dual row spacing.
• Separate insertion and withdrawal data: Published forces let fixture designers size extraction tooling and avoid board damage.
• 1000 cycle durability: Spring memory survives repeated burn-in and retest cycles that destroy stamped contacts.
• Standard 2.54mm dual row grid: Drops into existing DIP and dual row footprints without layout changes.

Dual row machined sockets are used wherever a dual in line package or a mezzanine board has to be socketed rather than soldered. Burn-in ovens and life test racks use them because stamped contacts lose spring force after a few hundred thermal cycles. Automotive ECU programmers rely on them to protect the plated through holes of control units that cost far more than the socket. They also serve in relay and optocoupler sockets, in audio and instrument designs where a low resistance contact keeps noise floors low, and in wire wrap prototyping where repeated rework is expected.

We machine sleeves in brass or beryllium copper and can raise gold thickness to 1.27 or 1.5 micron for high insertion count fixtures. Rows from 2 x 2 to 2 x 40 are cut from strip without new tooling. Optional features include a closed bottom to protect the through hole, tail lengths matched to 1.6mm or 2.4mm boards, an insulator in PPS or high temperature PEI, and a version with a machined keyway to prevent reversed insertion. Engineering samples ship within five working days of drawing approval.

Parts leave the line in anti-static bags or moulded trays, with the pin field protected by a foam interleaf so that no contact bears the weight of the carton above. Export cartons are printed with the CNJWY neutral label and sealed with tamper evident tape, and the gross weight stays below 15 kg for air freight. Pallet loads for ocean shipment are stretch wrapped and strapped for humidity control. Custom carton printing, own-brand reel or bag labels and barcoded cartons are available, and each shipment carries a first article dimensional sheet, a plating thickness certificate and a RoHS declaration referenced to the lot number.