China Quality Inspection for Construction Bolt - HDG DIN933 Hex Head Bolt Hot Dipped Galvanized – Hongji manufacturers and suppliers

Quality Inspection for Construction Bolt - HDG DIN933 Hex Head Bolt Hot Dipped Galvanized – Hongji

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d					M1.6		M2		M2.5		M3		(M3.5)		M4		M5		M6		(M7)		M8		M10		M12		(M14)		M16
P			Pitch		0.35		0.4		0.45		0.5		0.6		0.7		0.8		1		1		1.25		1.5		1.75		2		2
a			Max		1.05		1.2		1.35		1.5		1.8		2.1		2.4		3		3		3.75		4.5		5.25		6		6
c			Min		0.1		0.1		0.1		0.15		0.15		0.15		0.15		0.15		0.15		0.15		0.15		0.15		0.15		0.2
			Max		0.25		0.25		0.25		0.4		0.4		0.4		0.5		0.5		0.5		0.6		0.6		0.6		0.6		0.8
d_a			Max		2		2.6		3.1		3.6		4.1		4.7		5.7		6.8		7.8		9.2		11.2		13.7		15.7		17.7
d_w			A Class	Min	2.4		3.2		4.1		4.6		5.1		5.9		6.9		8.9		9.6		11.6		15.6		17.4		20.5		22.5
			B Class	Min	-		-		-		-		-		5.7		6.7		8.7		9.4		11.4		15.4		17.2		20.1		22
e			A Class	Min	3.41		4.32		5.45		6.01		6.58		7.66		8.79		11.05		12.12		14.38		18.9		21.1		24.49		26.75
			B Class	Min	-		-		-		-		-		7.5		8.63		10.89		11.94		14.2		18.72		20.88		23.91		26.17
k			Nominal		1.1		1.4		1.7		2		2.4		2.8		3.5		4		4.8		5.3		6.4		7.5		8.8		10
			A Class	Min	0.98		1.28		1.58		1.88		2.28		2.68		3.35		3.85		4.65		5.15		6.22		7.32		8.62		9.82
				Max	1.22		1.52		1.82		2.12		2.52		2.92		3.65		4.15		4.95		5.45		6.56		7.68		8.98		10.18
			B Class	Min	-		-		-		-		-		2.6		3.26		3.76		4.56		5.06		6.11		7.21		8.51		9.71
				Max	-		-		-		-		-		3		3.74		4.24		5.04		5.54		6.69		7.79		9.09		10.29
k₁			Min		0.7		0.9		1.1		1.3		1.6		1.9		2.28		2.63		3.19		3.54		4.28		5.05		5.96		6.8
r			Min		0.1		0.1		0.1		0.1		0.1		0.2		0.2		0.25		0.25		0.4		0.4		0.6		0.6		0.6
s			Max=Nominal		3.2		4		5		5.5		6		7		8		10		11		13		17		19		22		24
			A Class	Min	3.02		3.82		4.82		5.32		5.82		6.78		7.78		9.78		10.73		12.73		16.73		18.67		21.67		23.67
			B Class	Min	-		-		-		-		-		6.64		7.64		9.64		10.57		12.57		16.57		18.48		21.16		23.16
d						(M18)		M20		(M22)		M24		(M27)		M30		(M33)		M36		(M39)		M42		(M45)		M48		(M52)
P	Pitch					2.5		2.5		2.5		3		3		3.5		3.5		4		4		4.5		4.5		5		5
a	Max					7.5		7.5		7.5		9		9		10.5		10.5		12		12		13.5		13.5		15		15
c	Min					0.2		0.2		0.2		0.2		0.2		0.2		0.2		0.2		0.3		0.3		0.3		0.3		0.3
	Max					0.8		0.8		0.8		0.8		0.8		0.8		0.8		0.8		1		1		1		1		1
d_a	Max					20.2		22.4		24.4		26.4		30.4		33.4		36.4		39.4		42.4		45.6		48.6		52.6		56.6
d_w	A Class	Min				25.3		28.2		30		33.6		-		-		-		-		-		-		-		-		-
	B Class	Min				24.8		27.7		29.5		33.2		38		42.7		46.5		51.1		55.9		59.9		64.7		69.4		74.2
e	A Class	Min				30.14		33.53		35.72		39.98		-		-		-		-		-		-		-		-		-
	B Class	Min				29.56		32.95		35.03		39.55		45.2		50.85		55.37		60.79		66.44		71.3		76.95		82.6		88.25
k	Nominal					11.5		12.5		14		15		17		18.7		21		22.5		25		26		28		30		33
	A Class	Min				11.28		12.28		13.78		14.78		-		-		-		-		-		-		-		-		-
		Max				11.72		12.72		14.22		15.22		-		-		-		-		-		-		-		-		-
	B Class	Min				11.15		12.15		13.65		14.65		16.65		18.28		20.58		22.08		24.58		25.58		27.58		29.58		32.5
		Max				11.85		12.85		14.35		15.35		17.35		19.12		21.42		22.92		25.42		26.42		28.42		30.42		33.5
k₁	Min					7.8		8.5		9.6		10.3		11.7		12.8		14.4		15.5		17.2		17.9		19.3		20.9		22.8
r	Min					0.6		0.8		0.8		0.8		1		1		1		1		1		1.2		1.2		1.6		1.6
s	Max=Nominal					27		30		32		36		41		46		50		55		60		65		70		75		80
	A Class	Min				26.67		29.67		31.61		35.38		-		-		-		-		-		-		-		-		-
	B Class	Min				26.15		29.16		31		35		40		45		49		53.8		58.8		63.1		68.1		73.1		78.1

Detail drawing

Stainless steel hex bolt9
Stainless steel hex bolt10
Stainless steel hex bolt11
Stainless steel hex bolt12
Stainless steel hex bolt13
Stainless steel hex bolt15

HDG generally refers to hot-dip galvanizing. Hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the iron and steel parts first, in order to remove the iron oxide on the surface of the iron and steel parts, after pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the hot dip coating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

The corrosion resistance is mainly determined by the thickness of the galvanized layer, so the thickness measurement is often the main basis for judging the quality of the galvanized layer. The angle and speed of the solution also have a great influence. Therefore, it is practically impossible to obtain a completely uniform coating thickness. Therefore, the measurement of the adhesion amount can never be judged by a single point (location). It is only meaningful to measure the average adhesion weight (g) per unit area (㎡). There are many methods to measure the adhesion amount, such as destructive section metallographic observation method, pickling method, non-destructive film thickness meter method, electrochemical method, estimation method of weight difference between incoming and outgoing goods, etc. The commonly used methods are the film thickness gauge method and the pickling method.

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Packing

We provide a variety of different packaging to meet different shipping environment and cost control. The most common types of packaging are ton packs, woven bags, boxes in bulk, boxes in boxes, plus pallets or wooden cases to meet sea or air transport requirements. Below are photos of the different packaging types we offer for reference.

Packaging and delivery
Packaging and delivery1
Packaging and delivery2
Packaging and deliver3
Packaging and delivery4
Packaging and delivery3