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M300 Connectors

3.00mm pitch High-Reliability Connectors

Harwin’s M300 series brings a compact power solution to the High-Reliability portfolio, ideally suited for a wide variety of testing environments and conditions. Connectors are currently available in 3-contact single row, 6- and 10-contact double row. Vibration and shock resistant, compact power future-proofed.

About M300

  • 10A per contact (all electrically loaded; 5A if 22AWG wire is used)
  • Proven 4-finger contact design to maintain electrical contact through high vibration and shock
  • Beryllium Copper contact for improved temperature range: -65°C to +175°C
  • 1,000 mating cycles durability
  • Future-proofed materials – halogen-free, PFOS-free, SVHC-free and RoHS compliant
  • Low outgassing properties – 0.68% TML, 0.01% CVCM, 0.26 WVR (Water Vapour Recovered)
  • Recessed male and female contacts
  • Ready-made Off-The-Shelf cable assemblies available

Other useful features include keyway polarization, and identification of the #1 position. Harwin provides CAD Models and Test Reports to assist with your design activities.

Technical Details


Female Contacts

High performance Beryllium Copper contact, Brass outer shell; Gold finish

Male Contacts

Brass, Gold finish


30% Glass-Filled High Temperature Nylon (Polyamide) 4T, rated to UL94V-0


Stainless Steel



10A max per contact, all contacts electrically loaded (reduces to 5A for 22AWG wire)

Working Voltage

600V DC or AC peak (150V DC or AC peak at 70,000ft/21km/44mbar)

Maximum Voltage

1,800V DC or AC peak (450V DC or AC peak at 70,000ft/21km/44mbar)

Contact Resistance

6mΩ max

Insulation Resistance

100MΩ min


Operating Temperature

-65°C to +175°C

Humidity Classification

56 days at 90% RH

Vibration (with fixings)

10-500Hz, 1.52mm, 98m/s² (10G), 9 hours total

Shock (with fixings)

981m/s² (100G) for 6ms


0.68% TML, 0.01% CVCM, 0.26 WVR (Water Vapour Recovered)



1,000 mating cycles

Insertion force (per contact)

9N max

Withdrawal Force (per contact)

1N min

Wire Specification

Recommended Wire types

M22759/11, BS 3G 210 Type A, MIL-W-16878/6 type E

Wire Sizes

18 to 22 AWG

Insulation Diameter

Ø1.8mm max for 18 and 20 AWG, Ø1.4mm max for 22 AWG

Strip Length



Technical Documents

Component Specification (including pin numbering system)

PDF Download

Test Reports

Test Report HT043 – M300 Series – General (Electrical, Mechanical and Environmental)

PDF Download

Product Training

M300 Overview

PDF Download

Browse the Range

Cable Assemblies

Ready-to-use cabled connectors, single ended, fully inspected and tested. Backpotted for added strain relief. Ideal for both prototyping and full…

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Cable Connector Parts

Cable housings and contacts, sold separately. See Accessories and Tooling for cable crimping and assembly tools.

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PCB Connectors

Board-mounted connectors, vertical Throughboard style. Male and female options, with a choice of jackscrews available.

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Tooling & Accessories

Associated products and tooling hardware for the M300 range.

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How can we help you?

If you would like to talk to someone about Harwin’s product, technical knowledge or documentation, contact one of our Experts for assistance.

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