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HRB 2.5mm Waterproof Connector PCB Connector Header M2531R

HRB M2531R is a 2.5mm pitch waterproof PCB header, designed to mate with M2532 cable-side waterproof connector for reliable wire-to-board interconnection. The PCB header comes with locating posts, which effectively reduce wobble and offset after soldering on PCB, improving assembly stability. Keying features prevent reverse mis-mating during assembly. Parallel insertion with audible click latch confirms full mating, helping operators avoid incomplete connection issues. Suitable for industrial control, new energy, elevator and other high-reliability wiring scenarios.
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  • M2531R-2XN

  • HRB

  • 8536909000

Most industrial waterproof connectors are oversized, hard to assemble and costly. HRB 2.5mm pitch right angle wire to board waterproof connector (Model M2532/M2531R) is developed as a mini-size low-cost waterproof interconnect solution for automotive & outdoor electrical systems.

With IP67 waterproof and dustproof grade, solid rubber sealing and double locking mechanism, it guarantees stable sealing and anti-loosening performance under vibration, humidity and temperature fluctuation. Multiple pin counts from 2×9 to 2×20 satisfy diversified wiring demands of automotive cameras, vehicle batteries, electric two-wheelers and outdoor machinery.


 Part name Part number
Wire side Receptacle housing M2532 Series
Terminal T2532 Series
Applicable wire AWG16 to AWG22
PCB side Right Angle DIP Header M2531R Series



2.5mm Pitch Wire To Board Waterproof Connectors Part Name and Part Number, HRB M2532 series connector exploded view

P/N Definition

M2531R-2xN-X

      ①  ②   ③  ④    

①: HRB item series number

②: R: Right angle(90°)

③: Number of pins per row: 9/13/16/17/20

④: HSG Color: B: black, G: gray


Core Features


  • IP67 waterproof rating compliant with ISO 20653, fully dustproof & water-resistant

  • Integrated solid rubber seal ring, reliable wire & mating-side sealing

  • Double-fin socket contact, large front chamfer prevents grommet damage

  • Front cap assembly enables detection of incompletely inserted socket contacts

  • Full waterproof grommet on crimp area for compact structure

  • Waterproof seal ring at the mating area prevents direct contact with the insulator wall

  • Wide temperature range: -40℃ ~ +125℃, adapts vehicle harsh working conditions

  • Multiple pin options: 2×9, 2×13, 2×16, 2×17, 2×20 positions


Exploded view


This exploded view shows all key components of the waterproof connector, including pin contacts, pin insulator, front cap, seal ring, socket housing, grommet and rear cover. The multi-layer sealing structure delivers reliable IP67 waterproof performance, while the front cap design helps detect incomplete terminal insertion for improved assembly quality.

Exploded view of HRB waterproof wire-to-wire connector showing pin contacts, pin insulator, front cap, seal ring, socket housing, grommet and rear cover


Application Scenarios


  • Electric vehicle built-in battery waterproof connection

  • Electric motorcycle internal wiring

  • Automotive built-in camera waterproof harness

  • Outdoor monitoring & outdoor waterproof electrical equipment

  • Small industrial machinery damp environment wiring



Current Rating
3A AC DC max.
Voltage Rating
125V AC DC
Temperature range
-40 ºC to +125 ºC
Contact resistance
10mΩ Max
Insulation Resistance
100MΩ Min
Withstanding Voltage
1000V AC/minute
Waterproof grade
IPX7 of ISO 20653
Material
Pin Contact: Brass
Housing: PBT
Terminal Finish
Tin plated
Dustproof Grade
IP6X of ISO 20653

Q: What is the durability test requirement for M2532 series connector?

A: The mated connector shall complete 50 mating/unmating cycles at a maximum speed of 10 cycles per minute before environmental tests. After the test, the maximum contact resistance shall not exceed 10mΩ.

Q: What is the temperature rise requirement of M2532 connector?

A: With the connector fully mated, pass maximum rated current and measure the contact temperature rise. The maximum allowable temperature rise is 30°C.

Q: What is the vibration test requirement for M2532 series connector?

A: The mated connector is tested with 1A DC applied. Test frequency sweeps 50~1000Hz within 10 minutes, 3 hours for each X/Y/Z axis. Cable shall be fixed during test.

Requirements after test: No damage on appearance; contact resistance ≤10mΩ; discontinuity ≤1 microsecond max.

Q: What is the water resistance test requirement for M2532 series connector?

A: The connector is placed in a test chamber for cyclic water spray test.

- Shower ON: 20 min at room temperature

- Shower OFF: 40 min at 100°C

- Total 48 cycles.

Pass criteria: No damage on appearance; contact resistance ≤10mΩ.

Q: What is the humidity test requirement for M2532 series connector?

A: Fully mated connectors are exposed under 85±2°C, 90~95% relative humidity for 500 hours.

Acceptance criteria: No damage on appearance; contact resistance ≤10mΩ.

Q2：What is the function of locating posts on the PCB header?

A2: The locating posts help reduce wobble and offset after PCB assembly, greatly improving the overall stability of the connector.

Q: How to mate M2532 cable-side connector with M2531R PCB header?

A: Align the keying features of M2532 and M2531R. Insert parallelly at a constant speed until you see the primary latch fully engaged and hear an audible click. This confirms the cable-to-board mating is completed.










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