The part numbers of standard AR20 to AR60 round type pressure gauges are “G36-10-01” and “G46-10-01”(for the R thread type).
For example, the part number of the AR30-03BG-A pressure gauge is “G36-10-01.”
Details on the round type pressure gauge (with color zones) can be found
https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=combination-units&fa_id=10974
Special Applications: 10-AR (Clean Series), Body Size: 20, Reverse Flow: No, Thread: N (NPT), Port Size: 01 [1/8 (Size 20)], Accessory, Not Attached: None, Option: 1NYZ (1+N+Y+Z)
Special Applications: 10- (Clean Room Compliant), Size: 20, Backflow Function: None, Thread: Rc, Port Size: 01 (1/8), Accessory: H (Set Nut for Panel Mount), Specifications: 1 (0.005 to 0.2 MPa Setting)
Special Applications: 10- (Clean Room Compliant), Size: 20, Backflow Function: K (Backflow Function), Thread: Rc, Port Size: 01 (1/8), Accessory: H (Set Nut for Panel Mount), Specifications: Y (Upward Facing Knob)
.: 10 (ø10), Port Size/Applicable Tubing O.D.: 01 (R1/8, Rc1/8), Thread Material/Surface Treatment: A (Brass), Sealant: P (Face Seal)
.: 10 (ø10), Port Size/Applicable Tubing O.D.: 01 (R1/8, Rc1/8), Thread Material/Surface Treatment: A (Brass), Sealant: P (Face Seal)
Size: 2 (1/8, 1/4 Basis), Style: 2 (Elbow), Control Method: 0 (Meter-out), Thread: Rc (Metric M3, M5; Unified 10-32UNF), Port Size: 01 (1/8), Option: N (Nickel Plated)
Actuation: 3 (3-Position Closed Center), Electrical Entry: LL (L-type Plug Connector w/Cover), Lead Wire Length: 10 (1000mm), Manual Override: Non-locking Push Type, A,B Port: 01 (1/8)
Actuation: 4 (3-Position Exhaust Center), Electrical Entry: TT (Terminal Type), Lead Wire Length: 10 (1000mm), Manual Override: Non-locking Push Type, A,B Port: 01 (1/8), Thread Type: N (NPT)
Body Size: 1 (M5x0.8, 10-32UNF), Type: 2 (Elbow), Control Type: 0 (Meter-out), Thread: R (or Metric), Port Size: M5 (M5x0.8), Applicable Tubing O.D.: 01 (ø1/8"), Seal: w/o Sealant
Body Size: 1 (M5x0.8, 10-32UNF), Type: 2 (Elbow), Control Type: 1 (Meter-in), Thread: R (or Metric), Port Size: M5 (M5x0.8), Applicable Tubing O.D.: 01 (ø1/8"), Seal: w/o Sealant
Body Size: 2 (1/8, 1/4), Type: 2 (Elbow), Control Type: 0 (Meter-out), Thread: G (G), Port Size: 01 (1/8), Applicable Tubing O.D.: 10 (ø10), Seal: w/o Sealant
Body Size: 1 (M5x0.8, 10-32UNF), Type: 3 (Universal), Control Type: 0 (Meter-out), Thread: R (or Metric), Port Size: M5 (M5x0.8), Applicable Tubing O.D.: 01 (ø1/8"), Seal: w/o Sealant
Body Size: 2 (1/8, 1/4), Type: 2 (Elbow), Control Type: 0 (Meter-out), Thread: N (NPT), Port Size: 01 (1/8), Applicable Tubing O.D.: 10 (ø10), Seal: S (w/Sealant)
Body Size: 2 (1/8, 1/4), Type: 2 (Elbow), Control Type: 0 (Meter-out), Thread: N (NPT), Port Size: 01 (1/8), Applicable Tubing: 10 (ø10), Seal Method: P (Face Seal)
.: 01 (1/8"), Port Size/Applicable Tubing O.D.: 32 (10-32UNF), Thread Material/Surface Treatment: N (Brass+Electroless Nickel Plated)
.: 01 (1/8"), Port Size/Applicable Tubing O.D.: 32 (10-32UNF), Thread Material/Surface Treatment: N (Brass+Electroless Nickel Plated)
Body Size: 20, Thread: Rc: Size 20, 25, 30, 40; M5: Size 10, Port Size: 01 (1/8), Option: Standard, Semi-Standard 1: 1 (0.02 to 0.2MPa Setting), Semi-Standard 2: Standard
Body Size: 20, Thread: Rc: Size 20, 25, 30, 40; M5: Size 10, Port Size: 01 (1/8), Option: CG (C + G), Semi-Standard 1: C (Bowl Guard), Semi-Standard 2: Standard
Body Size: 20, Thread: Rc: Size 20, 25, 30, 40; M5: Size 10, Port Size: 01 (1/8), Option: BC (B + C), Semi-Standard 1: 12 (1 + 2), Semi-Standard 2: Standard