Key Slot Standards

The different Key layouts of the M.2 Slots – Image: RamCity. Consequently, this information also tells you whether the slot is compatible with PCIe x2 (B-key or M-key) or PCIe x4 (only M-key) operation. The x4 drives are considerably faster than the x2 drives since they use 4 PCIe lanes as opposed to 2, therefore multiplying the available. T-slots come in standard sizes. Needless to say things designed to fit in the T-slots are designed to fit these standard sizes. Similarly, the cutters designed for cutting T-slot are designed to cut standard size T-slots. Fig outline of a T-slot. The key characteristic of a T-slot is its width. Of course this can be metric or imperial.

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Standards for T-slots

T-slots come in standard sizes. Needless to say things designed to fit in the T-slots are designed to fit these standard sizes. Similarly, the cutters designed for cutting T-slot are designed to cut standard size T-slots.

fig outline of a T-slot

The key characteristic of a T-slot is its width. Of course this can be metric or imperial

Metric T-slots (all in millimeters)

A b B+ C C+ Hmin Hmax

Keys For Old Slot Machines

6 11 +1.5 5 +1 13 11

8 14.5 +1.5 7 +1 18 15

10 16 +2 7 +1 21 17

12 19 +2 8 +1 25 20

Imperial T-slots (All in inches)

diam of bolt width of slot depth of throatmax

A

Key Slot Standards Key

1/4 9/32 3/8 1/8 9/16 1/2 15/64 13/64

5/16 11/32 7/16 5/32 21/32 19/32

3/8 7/16

Key Slot Standards Games

1/2 9/16

5/8 11/16