Recommended Manufacturing Tolerance For Tube / Section Mill Rolls

01	Keyway Width	+	0.1
		+	0.3
02	Keyway Depth	+	0.2
03	Bearing Bore	+	0.4
			K6	30 dia to 50 dia	+0.003/-0.013
				above 50 dia to 80 dia	+0.004/-0.015
				above 80 dia to 120 dia	+0.004/-0.018
04	Bearing Bore Depth	+	0.025	For O.D. Series Rolls /Precision Rolls
		+	0.000
		+	0.05	For NB Series Rolls
		+	0.000
05	Concentricity		0.02	Prescision
			0.03	O.D Series Rolls
			0.04	N.B Series Rolls
06	FACE RUN OUT		PRESCISION	OD SERIES	NB SERIES
	Upto 150 O.D.		0.015	0.020	0.025
	Upto 300 O.D.		0.025	0.035	0.045
	Above 300 0.D.		0.030	0.040	0.050
07	Bore		G-7
08	Root Dia	±	0.025	± 0.030	± 0.035
09	Roll Thickness Tolerance
	Upto 150 O.D.	±	0.025	± 0.030	± 0.035
	Upto 300 O.D.	±	0.030	± 0.035	± 0.040
	Upto 300 O.D.	±	0.040	± 0.045	± 0.050

11. Referance surface for profile is the opposite side of stamping groove

12. Hardness Rolls (D2/D3 )

	Forming	58/60 (HRC)
	Sizing	59/61 (HRC)
	T.H Rolls	60/62 (HRC)
	Welding Rolls( Hot Die Steel)	53/55 (HRC)