Bolt/Nut/Washer Size Chart
Thread specification M			M16			M20		M22			M24			M27			M30
Pitch P			2			2.5		2.5			3			3			3.5
Screw plug	dw	minute	27.9			34.5		38.5			41.5			42.8			46.5
	b	L	≤50	≥55		≤60	≥65	≤65		≥70	≤70	≥75		≤75	≥80		≤80	≥85
		nominal	30	35		35	40	40		45	45	50		50	55		55	60
	K”	maximum	17			19		21			23			24			25
	L		40-130			45-160		50-220			55-250			60-280			65-320
Screw mother	dw	minute	24.9			31.4		33.3			38.0			42.8			46.5
	c	maximum	0.8			0.8		0.8			0.8			0.8			0.8
		minute	0.4			0.4		0.4			0.4			0.4			0.4
	m	maximum	17.1			20.7		23.6			24.2			27.6			30.7
		minute	16.4			19.4		22.3			22.9			26.3			29.1
	S	maximum	27			34		36			41			46			50
		minute	26.16			33		35			40			45			49
Pad circle	d2	minute	31.4			38.4		40.4			45.4			50.1			54.1
		maximum	33			40		42			47			52			56
	d1	minute	17			21		23			25			28			31
		maximum	17.43			21.52		23.52			25.52			28.52			31.62
	h	Nominal	4.0			4.0		5.0			5.0			5.0			5.0
		minute	3.5			3.5		4.5			4.5			4.5			4.5
		maximum	4.8			4.8		5.8			5.8			5.8			5.8
	d3	minute	19.23			24.32		26.32			28.32			32.84			35.84
		maximum	20.03			25.12		27.12			29.12			33.64			36.64
Bolt Materials and Mechanical Properties
Performance Level		Thread specification	Material		Tensile strength, MPa				Specified non-proportional extension MPa				Hardness HRC			Elongation (%)		Shrinkage rate %
10.9S		M16–M24	20MnTiB		1040–1240				≥940				33–39			≥10		≥42
		M27–M30	35VB

Mechanical Properties of Nuts
Thread specification M	M16	M20	M22	M24	M27	M30
Guaranteed Load (kN)	163	255	315	367	477	583
Performance Level	10H
Materials	35 or 45 (GB/T 699), ML35 (GB/T 6478)
Hardness	Rockwell hardness: 98 HRB to 32 HRC; Vickers hardness: 222 to 304 HV30

Mechanical Properties of Washers
Hardness	Rockwell hardness: 35 HRC to 45 HRC; Vickers hardness: 329 to 436 HV30

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Torsional-shear type (national standard)