Fit Method Selection (Excerpt from JIS B 0401-1:2016)

• Fit condition with recommended hole basis fit method
• Fit condition with recommended shaft basis fit method

Fit condition with recommended hole basis fit method

Hole basis	Shaft tolerance class
	Running fit							Transition fit				Interference fit
H6						g5	h5	js5	k5	m5		n5	p5
H7					f6	g6	h6	js6	k6	m6	n6		p6	r6	s6	t6	u6	x6
H8				e7	f7		h7	js7	k7	m7					s7		u7
			d8	e8	f8		h8
H9			d8	e8	f8		h8
H10	b9	c9	d9	e9			h9
H11	b11	c11	d10				h10

Fit condition with recommended shaft basis fit method

Shaft basis	Hole tolerance class
	Running fit							Transition fit				Interference fit
h5						G6	H6	JS6	K6	M6		N6	P6
h6					F7	G7	H7	JS7	K7	M7	N7		P7	R7	S7	T7	U7	X7
h7				E8	F8		H8
h8			D9	E9	F9		H9
h9				E8	F8		H8
			D9	E9	F9		H9
	B11	C10	D10				H10

Where possible, the first choice for fit should be selected from among the tolerance classes shown in color.

The best fit can be obtained from a combination of hole basis fit methods or a combination of shaft basis fit methods for special use.

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