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| PartNumber | M20-9742042 | M20-9742046 | M20-9742142 |
| Description | Headers & Wire Housings 20+20 DIL HORIZONTAL PIN HEADER GOLD+TIN | Headers & Wire Housings 20+20 DIL HORIZONTAL PIN HEADER TIN | Headers & Wire Housings 21+21 DIL HORIZONTAL PIN HEADER GOLD+TIN |
| Manufacturer | Harwin | Harwin | Harwin |
| Product Category | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| RoHS | Y | Y | Y |
| Product | Headers | Headers | Headers |
| Type | Pin Strip | Pin Strip | Pin Strip |
| Number of Positions | 40 Position | 40 Position | 42 Position |
| Pitch | 2.54 mm | 2.54 mm | 2.54 mm |
| Number of Rows | 2 Row | 2 Row | 2 Row |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Termination Style | Through Hole | Through Hole | Through Hole |
| Mounting Angle | Right Angle | Right Angle | Right Angle |
| Contact Plating | Gold | Tin | Gold |
| Series | M20 | M20 | M20 |
| Brand | Harwin | Harwin | Harwin |
| Product Type | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Factory Pack Quantity | 100 | 100 | 100 |
| Subcategory | Headers & Wire Housings | Headers & Wire Housings | Headers & Wire Housings |
| Unit Weight | 0.100178 oz | 0.100178 oz | 0.105187 oz |