RS Components
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ERNI, ERmet 2mm Pitch Hard Metric Type B Backplane Connector, Male, Vertical, 25 Column, 7 Row, 125 Way

This image is representative of the product range

On back order for despatch 26/01/2021, delivery within 7 working days from despatch date.
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RS Stock No.:
Mfr. Part No.:
COO (Country of Origin):
unitsPer unit
1 - 99$13.89
100 - 249$11.93
250 - 499$11.40
500 - 999$10.90
1000 +$10.52

ERNI ERmet 2.0 mm Hard Metric Male Connectors

ERmet 2.0 mm Hard Metric male connectors with a high density modular design supported by international connector standards IEC 61076-4-101. These ERmet 2.0 mm HM male connectors can support various PCB arrangements including backplane, board to board and mezzanine applications. The signal pins of these headers have 3 lengths allowing 3 levels of sequential mating in 1.5 mm increments for front or rear hot swappable applications. The contacts of these ERmet 2.0 mm HM backplane connectors have a long 2.5 mm wipe length that ensures reliable mating even in adverse conditions. These ERmet 2.0 mm HM male connectors are available with optional shielding contact rows for optimum performance. Versions are also available with location pegs for improved rigidity and polarisation on the PCB. The press fit terminations of these ERmet 2.0 mm HM backplane header connectors enable simple and secure PCB mounting. These ERmet 2.0 mm Hard Metric male connectors are available in Type A, B & C configurations and various modular widths.
Stock number 917-5251 has a type B8, stage (Hot Swap) configuration with M2 keying and a PXI slot type

Features and Benefits

High density design
Conforms to international connector standards IEC 61076-4-101
3 stage sequential mating for hot swappable applications
Long contact wipe length of 2.5 mm
Alignment and polarisation features
Shielding and PCB location peg options
Press fit terminations


These ERmet 2.0 mm Hard Metric backplane headers provide a cost effective backplane, board to board and mezzanine solution for a range of high performance high density applications. Industries include networking systems, telecommunications and high performance industrial computing where PICMG specifications apply. These ERmet 2.0 mm HM connectors have also gained widespread acceptance is the interconnect system for CompactPCI.

ERNI ERmet 2.0 mm Hard Metric Connector System

Backplane Connector TypeHard Metric Type B
Number of Contacts125
Number of Columns25
Number of Rows7
Body OrientationVertical
Housing MaterialPBT
Contact MaterialPhosphor Bronze
Contact PlatingGold
Current Rating1.5A
Termination MethodPress Fit
Minimum Operating Temperature-55°C
Maximum Operating Temperature+125°C