D-Sub Backshells – Mouser United Kingdom

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X3 Precision-Machine One-Piece Threaded Backshells

Positronic X3 Precision-Machined One-Piece Threaded Backshells are designed for use with D-Sub connectors and circular M38999/AS85049 backshell accessories. These backshells deliver robust mechanical integrity and continuous 360° EMI shielding. The X3 threaded backshells are compatible with machined and stamped shells for standard, high, and mixed-density D-Sub connectors, including the Mach-D series. These backshells are available in six shell sizes with both standard and low-profile configurations. The X3 threaded backshells are housed in aluminum or stainless steel with multiple plating options and can be specified with fixed or rotating jackscrews. These backshells operate at -55°C to 125°C temperature range and are ideal for military, aero, spaceflight, and industrial applications.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (GBP) Filter the results in the table by unit price based on your quantity.	Qty.	Type	Shell Size	Cable Entry Angle	Number of Cable Entries	Shell Material	Shell Plating	Number of Positions
D-Sub Backshells 15Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D15000X3WLT20/AA Amphenol Positronic 1: £331.07 7In Stock New Product	Mfr. Part No. D15000X3WLT20/AA Mouser Part No 276-D15000X3WLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 15Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	7In Stock	£331.07 £281.46 £267.95	Min.: 1 Mult.: 1	D-Sub Backshell	2	Straight	1 Entry	Aluminum	Nickel	15 Position
D-Sub Backshells 25Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D25000X3WLE0/AA Amphenol Positronic 1: £342.49 7In Stock New Product	Mfr. Part No. D25000X3WLE0/AA Mouser Part No 276-D25000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 25Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	7In Stock	£342.49 £291.17 £284.36	Min.: 1 Mult.: 1	D-Sub Backshell	3	Straight	1 Entry	Aluminum	Nickel	25 Position
D-Sub Backshells 25Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D25000X3WLT20/AA Amphenol Positronic 1: £351.54 7In Stock New Product	Mfr. Part No. D25000X3WLT20/AA Mouser Part No 276-D25000X3WLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 25Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	7In Stock	£351.54 £298.86 £292.08	Min.: 1 Mult.: 1	D-Sub Backshell	3	Straight	1 Entry	Aluminum	Nickel	25 Position
D-Sub Backshells 104Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D104000X3PLE0/AA Amphenol Positronic 1: £425.01 10On Order New Product	Mfr. Part No. D104000X3PLE0/AA Mouser Part No 276-D104000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 104Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£425.01 £362.62	Min.: 1 Mult.: 1	D-Sub Backshell	6	Straight	1 Entry	Aluminum	Nickel	104 Position
D-Sub Backshells 104Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D104000X3PLT20/AA Amphenol Positronic 1: £423.84 10On Order New Product	Mfr. Part No. D104000X3PLT20/AA Mouser Part No 276-D104000X3PLT20AA New Product	Amphenol Positronic	D-Sub Backshells 104Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£423.84 £361.62	Min.: 1 Mult.: 1	D-Sub Backshell	6	Straight	1 Entry	Aluminum	Nickel	104 Position
D-Sub Backshells 104Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D104000X3WLE0/AA Amphenol Positronic 1: £450.20 10Expected 11/11/2026 New Product	Mfr. Part No. D104000X3WLE0/AA Mouser Part No 276-D104000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 104Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10Expected 11/11/2026	£450.20 £382.77	Min.: 1 Mult.: 1	D-Sub Backshell	6	Straight	1 Entry	Aluminum	Nickel	104 Position
D-Sub Backshells 104Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D104000X3WLT20/AA Amphenol Positronic 1: £448.91 10Expected 11/11/2026 New Product	Mfr. Part No. D104000X3WLT20/AA Mouser Part No 276-D104000X3WLT20AA New Product	Amphenol Positronic	D-Sub Backshells 104Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10Expected 11/11/2026	£448.91 £381.67	Min.: 1 Mult.: 1	D-Sub Backshell	6	Straight	1 Entry	Aluminum	Nickel	104 Position
D-Sub Backshells 15Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D15000X3PLE0/AA Amphenol Positronic 1: £346.83 10On Order New Product	Mfr. Part No. D15000X3PLE0/AA Mouser Part No 276-D15000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 15Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£346.83 £294.86	Min.: 1 Mult.: 1	D-Sub Backshell	2	Straight	1 Entry	Aluminum	Nickel	15 Position
D-Sub Backshells 15Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D15000X3PLT20/AA Amphenol Positronic 1: £345.62 10On Order New Product	Mfr. Part No. D15000X3PLT20/AA Mouser Part No 276-D15000X3PLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 15Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£345.62 £293.83	Min.: 1 Mult.: 1	D-Sub Backshell	2	Straight	1 Entry	Aluminum	Nickel	15 Position
D-Sub Backshells 15Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D15000X3WLE0/AA Amphenol Positronic 1: £364.78 10On Order New Product	Mfr. Part No. D15000X3WLE0/AA Mouser Part No 276-D15000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 15Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£364.78 £310.13	Min.: 1 Mult.: 1	D-Sub Backshell	2	Straight	1 Entry	Aluminum	Nickel	15 Position
D-Sub Backshells 25Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D25000X3PLE0/AA Amphenol Positronic 1: £413.97 10On Order New Product	Mfr. Part No. D25000X3PLE0/AA Mouser Part No 276-D25000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 25Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£413.97 £351.96	Min.: 1 Mult.: 1	D-Sub Backshell	3	Straight	1 Entry	Aluminum	Nickel	25 Position
D-Sub Backshells 25Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D25000X3PLT20/AA Amphenol Positronic 1: £367.05 10On Order New Product	Mfr. Part No. D25000X3PLT20/AA Mouser Part No 276-D25000X3PLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 25Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£367.05 £312.05	Min.: 1 Mult.: 1	D-Sub Backshell	3	Straight	1 Entry	Aluminum	Nickel	25 Position
D-Sub Backshells 37Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D37000X3PLE0/AA Amphenol Positronic 1: £437.00 10On Order New Product	Mfr. Part No. D37000X3PLE0/AA Mouser Part No 276-D37000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 37Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£437.00 £371.54	Min.: 1 Mult.: 1	D-Sub Backshell	4	Straight	1 Entry	Aluminum	Nickel	37 Position
D-Sub Backshells 37Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D37000X3PLT20/AA Amphenol Positronic 1: £435.71 10On Order New Product	Mfr. Part No. D37000X3PLT20/AA Mouser Part No 276-D37000X3PLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 37Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£435.71 £370.45	Min.: 1 Mult.: 1	D-Sub Backshell	4	Straight	1 Entry	Aluminum	Nickel	37 Position
D-Sub Backshells 37Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D37000X3WLE0/AA Amphenol Positronic 1: £407.71 10On Order New Product	Mfr. Part No. D37000X3WLE0/AA Mouser Part No 276-D37000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 37Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£407.71 £346.64	Min.: 1 Mult.: 1	D-Sub Backshell	4	Straight	1 Entry	Aluminum	Nickel	37 Position
D-Sub Backshells 37Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D37000X3WLT20/AA Amphenol Positronic 1: £381.31 10On Order New Product	Mfr. Part No. D37000X3WLT20/AA Mouser Part No 276-D37000X3WLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 37Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£381.31 £324.17	Min.: 1 Mult.: 1	D-Sub Backshell	4	Straight	1 Entry	Aluminum	Nickel	37 Position
D-Sub Backshells 50Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D50000X3PLE0/AA Amphenol Positronic 1: £432.75 10On Order New Product	Mfr. Part No. D50000X3PLE0/AA Mouser Part No 276-D50000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 50Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£432.75 £367.92	Min.: 1 Mult.: 1	D-Sub Backshell	5	Straight	1 Entry	Aluminum	Nickel	50 Position
D-Sub Backshells 50Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D50000X3PLT20/AA Amphenol Positronic 1: £431.52 10On Order New Product	Mfr. Part No. D50000X3PLT20/AA Mouser Part No 276-D50000X3PLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 50Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£431.52 £366.87	Min.: 1 Mult.: 1	D-Sub Backshell	5	Straight	1 Entry	Aluminum	Nickel	50 Position
D-Sub Backshells 50Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D50000X3WLE0/AA Amphenol Positronic 1: £403.04 10On Order New Product	Mfr. Part No. D50000X3WLE0/AA Mouser Part No 276-D50000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 50Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£403.04 £342.65	Min.: 1 Mult.: 1	D-Sub Backshell	5	Straight	1 Entry	Aluminum	Nickel	50 Position
D-Sub Backshells 50Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D50000X3WLT20/AA Amphenol Positronic 1: £381.06 10On Order New Product	Mfr. Part No. D50000X3WLT20/AA Mouser Part No 276-D50000X3WLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 50Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£381.06 £323.97	Min.: 1 Mult.: 1	D-Sub Backshell	5	Straight	1 Entry	Aluminum	Nickel	50 Position
D-Sub Backshells 9Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D9000X3PLE0/AA Amphenol Positronic 1: £344.16 10On Order New Product	Mfr. Part No. D9000X3PLE0/AA Mouser Part No 276-D9000X3PLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 9Backshell, Top Entry, Threaded, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£344.16 £292.60	Min.: 1 Mult.: 1	D-Sub Backshell	1	Straight	1 Entry	Aluminum	Nickel	9 Position
D-Sub Backshells 9Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish D9000X3PLT20/AA Amphenol Positronic 1: £342.91 10On Order New Product	Mfr. Part No. D9000X3PLT20/AA Mouser Part No 276-D9000X3PLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 9Backshell, Top Entry, Threaded, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£342.91 £291.53	Min.: 1 Mult.: 1	D-Sub Backshell	1	Straight	1 Entry	Aluminum	Nickel	9 Position
D-Sub Backshells 9Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish D9000X3WLE0/AA Amphenol Positronic 1: £343.14 10On Order New Product	Mfr. Part No. D9000X3WLE0/AA Mouser Part No 276-D9000X3WLE0/AA New Product	Amphenol Positronic	D-Sub Backshells 9Backshell, Top Entry, Threaded, Low Profile, Rotating Male Jackscrew, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10On Order	£343.14 £291.75	Min.: 1 Mult.: 1	D-Sub Backshell	1	Straight	1 Entry	Aluminum	Nickel	9 Position
D-Sub Backshells 9Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish D9000X3WLT20/AA Amphenol Positronic 1: £301.39 10Expected 04/11/2026 New Product	Mfr. Part No. D9000X3WLT20/AA Mouser Part No 276-D9000X3WLT20/AA New Product	Amphenol Positronic	D-Sub Backshells 9Backshell, Top Entry, Threaded, Low Profile, Fixed Female Jackpost, Conductive Electroless Nickel Finish Learn More about Amphenol Positronic positronic x3 precision machined backshells	Datasheet	10Expected 04/11/2026	£301.39 £256.22	Min.: 1 Mult.: 1	D-Sub Backshell	1	Straight	1 Entry	Aluminum	Nickel	9 Position

X3 Precision-Machine One-Piece Threaded Backshells

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