Flat Head SQ Neck Bolt

DIN 605, DIN 608, ASME B18.9.

Flat head bolt are characterized by having a head with a flat top and bottom that is cone shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.

Technical Specification
Size:	M4-M24 1/4″-3/4″
Grade:	8.8, 10.9, GR.5, GR.8
Materials:	Carbon Steel, Alloy Steel, MS, Copper, Brass & Stainless Steel (SS 304,SS 302, SS 316)
Finish:	White Zinc Plated, Yellow Zinc Plated, Auto Black Plated, Chrome Plated & other as per customer requirement

Back

d			M6		M8		M10
P			1		1.25		1.5
b		1	18		22		26
		2	24		28		32
		3	—		41		45
dk		max.	16.55		20.65		24.65
		min.	15.45		19.35		23.35
ds		max.	6		8		10
		min.	5.52		7.42		9.42
fn		max.	7.45		9.45		11.55
		min.	6.55		8.55		9.45
r		max.	0.9		1.2		1.5
v		max.	6.48		8.58		10.58
		min.	5.52		7.42		9.42
L			ls and lg
			ls	lg	ls	lg	ls	lg
Nominal	min.	max.	min.	max.	min.	max.	min.	max.
30	28.95	31.05	—	12.50	—	16.00
35	33.75	36.25	—	12.50	—	16.00
40	38.75	41.25	17.00	22.00	—	16.00	—	18.00
45	43.75	46.25	22.00	27.00	16.75	23.00	—	18.00
50	48.75	51.25	27.00	32.00	21.75	28.00	16.50	24.00
55	53.50	56.50	32.00	37.00	26.75	33.00	21.50	29.00
60	58.50	61.50	37.00	42.00	31.75	38.00	26.50	34.00
65	63.50	66.50			36.75	43.00	31.50	39.00
70	68.50	71.50			41.75	48.00	36.50	44.00
80	78.50	81.50			51.75	58.00	46.50	54.00
90	88.75	91.75					56.50	64.00
100	98.25	101.75					66.50	74.00


d			M6		M8		M10
L			WEIGHT IN KG/1000 PCS
30			8.80		15.40
35			9.80		17.40
40			10.80		19.30		30.60
45			11.90		21.30		33.60
50			12.90		23.20		36.50
55			13.90		25.20		39.40
60			14.90		27.10		42.40
65					29.10		45.30
70					31.00		48.20
80					34.90		54.10
90							59.90
100							65.70