And for the MHL2 and MHF2 series, it indicates the opening/closing stroke.
For details, refer to the "How to Order" section in the web catalog of each series. The parallel type air gripper catalogs can be found here.

The MHL2 Series finger motion is synchronized by a rack-and-pinion mechanism. The double piston construction creates a compact gripper with a large holding force. Vacuum ports, copper fluorine and silicon free options available.

Angular Style Air Gripper Standard Type Series MHC2 Size: 10, 16, 20, 25 2

MHC2-10D JIS Symbol Double acting How to Order D 20 MHC2 Y59A S Number of auto switches Single acting Angular style air gripper 2 pcs. 1 pc. S Nil Bore size 10 mm 10 Action Auto switch Double acting D Single acting S 16 mm 16 20 mm 20 25 mm 25 Without auto switch (Built-in magnet) Nil For the applicable auto switch model, refer to the table below.

How Grip: Pinch, Parallel Type / Open, Parallel Type, Number of Fingers: 2 Pcs., Open Dimension L1(mm): 76, Closed Dimension L2(mm): 56, Type: [Main Body] Body, Operation Method: Double Acting, Main Body Shape: Square Shape (Wide), Gripping Force (Closed Side at 0.5 Mpa)(N): 14, Gripping Force (Open Side at 0.5 Mpa)(N): 14, Environment, Applications: Dust Resistant, Additional Function: Bearing

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 16mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: Wide Opening, Auto Switch: Solid State, 2-color Indication, 3 Wire PNP, Horizontal, Lead Wire: 1m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 20mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: Wide Opening, Auto Switch: Solid State, 2-color Indication, 3 Wire PNP, Horizontal, Lead Wire: 5m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 16mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: Wide Opening, Auto Switch: Solid State, Water Resist., 3 Wire NPN, Horizontal, Lead Wire: 1m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 20mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: Wide Opening, Auto Switch: Solid State, Gen. Purpose, 3 Wire NPN, Horizontal, Lead Wire: 1m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 40mm, Thread Type: NPT, Opening/Closing Stroke: Extra Wide Opening, Auto Switch: Solid State, Gen. Purpose, 3 Wire PNP, Horizontal, Lead Wire: 1m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 40mm, Thread Type: NPT, Opening/Closing Stroke: Extra Wide Opening, Auto Switch: Solid State, Gen. Purpose, 2 Wire, Horizontal, Lead Wire: 5m, Number: 1 pc.

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 25mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: Extra Wide Opening, Auto Switch: Solid State, Water Resist., 3 Wire PNP, Horizontal, Lead Wire: 1m, Number: 4 pcs.

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 40mm, Thread Type: NPT, Opening/Closing Stroke: Extra Wide Opening, Auto Switch: Solid State, Water Resist., 3 Wire PNP, Horizontal, Lead Wire: 1m, Number: -

Clean Series: Copper, Flourine & Silicon-Free+Low Particle Generation, Bore Size: 40mm, Thread Type: NPT, Opening/Closing Stroke: Extra Wide Opening, Auto Switch: Solid State, Water Resist., 3 Wire NPN, Horizontal, Lead Wire: 5m, Number: 4 pcs.

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 16mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: 1 (Wide Opening), Auto Switch: M9PW (Solid State, 2-color Indication, 3 Wire PNP, Horizontal), Lead Wire: M (1m)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 20mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: 1 (Wide Opening), Auto Switch: M9PW (Solid State, 2-color Indication, 3 Wire PNP, Horizontal), Lead Wire: Z (5m)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 16mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: 1 (Wide Opening), Auto Switch: M9NA (Solid State, Water Resist., 3 Wire NPN, Horizontal), Lead Wire: M (1m)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 20mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: 1 (Wide Opening), Auto Switch: M9N (Solid State, Gen. Purpose, 3 Wire NPN, Horizontal), Lead Wire: M (1m)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 40mm, Thread Type: TN (NPT), Opening/Closing Stroke: 2 (Extra Wide Opening), Auto Switch: M9P (Solid State, Gen. Purpose, 3 Wire PNP, Horizontal), Lead Wire: M (1m)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 40mm, Thread Type: TN (NPT), Opening/Closing Stroke: 2 (Extra Wide Opening), Auto Switch: M9B (Solid State, Gen. Purpose, 2 Wire, Horizontal), Lead Wire: Z (5m), Number: S (1 pc.)

Clean Series: 22 (Copper, Flourine & Silicon-Free+Low Particle Generation), Bore Size: 25mm, Thread Type: Rc: 32, 40 Bore; M Thread: 10, 16, 20, 25 Bore, Opening/Closing Stroke: 2 (Extra Wide Opening), Auto Switch: M9PA (Solid State, Water Resist., 3 Wire PNP, Horizontal), Lead Wire: M (1m), Number: 4 pcs.