Security Gateway Manual Netgate-4200
3.1.2 Which M.2 card sizes physically fit the sockets?
The M.2 sockets on the Netgate 4200 primarily support 80mm length cards, such as 2280, because 80mm cards can be
installed using only a metric machine screw for retention. M.2 NVMe SSDs are commonly available in 2280 size.
There are pre-drilled holes tapped to accept M2.5-0.45 machine screws for card retention at 42, 52 and 80mm lengths,
but the holes at 42 and 52mm are lower than the socket and the hole at 80mm.
Warning: Cards shorter than 80mm require a metal through-hole spacer or equivalent standoff in addition to an
appropriate length retention screw. For specifications, see the next question.
Fig. 2: Close-up view of M.2 socket #3 (J13) with retention screw locations marked
Tip: Shorter card sizes such as 2230 may also work using third party M.2 extender devices which increase the length
of an M.2 card up to the equivalent size of a 2280 card.
3.1.3 What size retention screws do the the M.2 sockets require?
80mm cards
80mm cards require a single M2.5-0.45 x 6mm Phillips pan head machine screw.
42 and 52mm cards
42 and 52mm cards require a screw and a through-hole spacer:
• M2.5-0.45 x 12mm Phillips pan head machine screw.
• 6.35mm / 0.25in tall metal through-hole spacer.
The spacer must have an inner diameter of 2.7mm (0.106in.) minimum and an outer diameter of 6mm
(0.23in.) maximum.
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