Product Description

Insulated ring tongue terminal that establishes a durable electrical connection for 22–16 AWG conductors on an M4 (#8) stud in aircraft and other wiring installations.

0 1. Overview

The PIDG ring tongue terminal with part number 31890 uses a copper body with a tin finish and a closed barrel configuration for crimp attachment. A tin plated copper wire support sleeve reinforces the conductor at the barrel entry. The barrel is surrounded by a red nylon insulation sleeve that includes insulation support and an insulation sleeve material specified as nylon. The insulation outside diameter is specified up to 3.56 mm, and the stud diameter is 4.17 mm corresponding to stud size 8 with M4 threading. The terminal accepts conductors from 0.30 to 1.40 mm² (22–16 AWG) with a wire size range of 509 to 3,260 CMA. The receptacle style is straight and the body style is PIDG with a ring shape designated RING-041. Tongue material thickness is 0.84 mm and the product length is 21.44 mm as referenced in the series description. The voltage rating is 300 VAC and the temperature range extends to 105 °C. The design carries class 1 and 2 classification and includes government or industry qualification with government part number MS25036-149. An associated National Stock Number is 5940-00-636-5590, and an alternate manufacturer part number is 2-31890-1. The terminal is RoHS and ELV compliant and is supplied as loose-piece parts in packs of twenty-five. The item is manufactured in the United States and carries export classification EAR99 with Schedule B code 8536.90.4000.

0 2. Key Features

  • PIDG closed barrel ring tongue construction for 22–16 AWG conductors
  • Tin finished copper body with tin plated copper wire support sleeve
  • Red nylon insulation sleeve with insulation support
  • Stud size 8 with M4 thread and 4.17 mm stud diameter
  • Overall length of 21.44 mm with 0.84 mm tongue thickness
  • 300 VAC voltage rating and 105 °C temperature capability
  • Wire size capability from 509 to 3,260 CMA
  • Government or industry qualified with MS25036-149 designation
  • Assigned NSN 5940-00-636-5590
  • Packaged as loose-piece terminals in packs of twenty-five
0 3. Specifications

Manufacturer Part Number: 31890
Alternate Manufacturer Part Number: 2-31890-1
NSN: 5940-00-636-5590
Terminal Type: Ring tongue, PIDG, closed barrel
Wire Size Range: 22–16 AWG (0.30–1.40 mm²)
Wire Size (CMA): 509–3,260 CMA
Receptacle Style: Straight
Wire/Cable Type: Regular wire
Material: Copper
Finish: Tin
Wire Support Sleeve Material: Tin plated copper
Insulation: Yes
Insulation Material: Nylon
Insulation Sleeve Material: Nylon
Insulation Color: Red
Insulation Support: Yes
Insulation Diameter: 3.56 mm [0.140 in] max
Stud Size: 8 [M4]
Stud Diameter: 4.17 mm [0.164 in]
Overall Length: 21.44 mm
Tongue Material Thickness: 0.84 mm [0.033 in]
Voltage Rating: 300 VAC
Temperature Range: up to 105 °C
Shape: RING-041
Heavy Duty: No
Class: 1 and 2
Government/Industry Qualification: Yes
Government/Industry Part Number: MS25036-149
RoHS/ELV Compliance: RoHS compliant, ELV compliant
Lead Free Solder Processes: Not relevant for lead free process
Packaging Method: Loose piece
Pack Quantity: 25
Country of Origin: United States
ECCN: EAR99
Schedule B Code: 8536.90.4000

FAQs

01. What conductor sizes are supported by the 31890 ring tongue terminal?

The 31890 ring tongue terminal supports 22–16 AWG conductors with a cross-sectional area of 0.30 to 1.40 mm² and a wire size range of 509 to 3,260 CMA.

02. Which stud size is compatible with part 31890?

Part 31890 is compatible with a stud size 8 with an M4 thread and a stud diameter of 4.17 mm.

03. What materials are used in the 31890 terminal construction?

The 31890 terminal has a copper body with a tin finish, a tin plated copper wire support sleeve, and a red nylon insulation sleeve.

04. What electrical and temperature ratings apply to the 31890 PIDG terminal?

The 31890 PIDG terminal is rated for 300 VAC and operates within a temperature range up to 105 °C.

05. How many pieces are included in a standard pack of part 31890?

A standard pack of part 31890 contains twenty-five loose-piece terminals.

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