PLAIN PLUG AND RING GAUGES (CLASS Z, Y, X, XX)
How to Determine and Select the Proper Tolerance for Your Gauging Application
The normal rule of practice requires 10 % of product tolerance to divided between the ‘GO and NOGO” gauges. For plug gauges, a plus tolerance is applied to the GO member and a minus tolerance to NOGO member. Ring gauges receive reverse tolerance direction so that the GO member is a minus and the NOGO is plus tolerance. Applying this result practice results in gauge tolerance always being included in the part tolerance by up to 10%. This results in the possibility that 10% of good product could fail inspection that no bad product would ever pass.
Cylindrical Plain Plug/Ring Tolerance Classes (ASME/ANSI B89.1.6 & B89.1.5)

Proper Care Usage of Gauges
- Parts Dimensions to be gauged should be free of burrs to prevent gauging interference.
- Gauges should be turned or pushed slowly and gently. Forcing gauges will result in faulty gauging and possibility of damaging both the gauge and the part.
ID - Item Name
PP03
-
PLAIN PLUG 30-40 mm D/E
PP04
-
PLAIN PLUG 40-50 mm D/E
PP05
-
PLAIN PLUG 50-70 mm D/E
PP06
-
PLAIN PLUG 70-90 mm D/E
PP07
-
PLAIN PLUG 90-100 mm D/E
PP08
-
PLAIN PLUG 100-120 mm D/E
PP09
-
PLAIN PLUG 120-140 mm D/E
PP10
-
PLAIN PLUG 140-160 mm D/E
PP11
-
PLAIN PLUG 160-180 mm D/E
PP12
-
PLAIN PLUG 180-200 mm D/E
PP13
-
PLAIN PLUG 200-220 mm D/E
PP14
-
PLAIN PLUG 220-240 mm D/E
PP15
-
PLAIN PLUG 240-260 mm D/E
PP16
-
PLAIN PLUG 260-280 mm D/E
PP17
-
PLAIN PLUG 280-300 mm D/E
PR01
-
PLAIN RING 5-10 mm CLASS Z
PR02
-
PLAIN RING 10-30 mm CLASS Z
PR03
-
PLAIN RING 30-50 mm CLASS Z
PR04
-
PLAIN RING 50-60 mm CLASS Z
PR05
-
PLAIN RING 60-70 mm CLASS Z
PR06
-
PLAIN RING 70-80 mm CLASS Z
PR07
-
PLAIN RING 80-90 mm CLASS Z
PR08
-
PLAIN RING 90-100 mm CLASS Z
PR09
-
PLAIN RING 100-110 mm CLASS Z
PR10
-
PLAIN RING 110-120 mm CLASS Z
PR11
-
PLAIN RING 120-130 mm CLASS Z
PR12
-
PLAIN RING 130-140 mm CLASS Z
PR13
-
PLAIN RING 140-150 mm CLASS Z
PR14
-
PLAIN RING 150-160 mm CLASS Z
PR15
-
PLAIN RING 160-170 mm CLASS Z
PR16
-
PLAIN RING 170-180 mm CLASS Z
PR17
-
PLAIN RING 180-190 mm CLASS Z
PR18
-
PLAIN RING 190-200 mm CLASS Z
PR19
-
PLAIN RING 200-210 mm CLASS Z
PR20
-
PLAIN RING 210-220 mm CLASS Z
PR21
-
PLAIN RING 220-230 mm CLASS Z
PR22
-
PLAIN RING 230-240 mm CLASS Z
PR23
-
PLAIN RING 240-250 mm CLASS Z
PR24
-
PLAIN RING 250-260 mm CLASS Z
PR25
-
PLAIN RING 260-270 mm CLASS Z
PR26
-
PLAIN RING 270-280 mm CLASS Z
PR27
-
PLAIN RING 280-290 mm CLASS Z
PR28
-
PLAIN RING 290-300 mm CLASS Z