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Click Specification

(Non-preferred) dimensions in parentheses.

Unit:mm

Hexagon lobular socket countersunk head screws

Q 258

Display drawing:

汽标代号Q 258 Q258 258Q Hexagon lobular socket countersunk head screws

Screw Thread
d

M6

M8

M10

M12

(M14)

M16

P		Pitch
b		min
d_k		Theoretical	max
		Actual	max
			min
k		max
Socket No.
A		Ref.
t		max
		min
a		max
r		max
x		max

1	1.25	1.5	1.75	2	2
38	38	38	48	48	48
12.6	17.3	20	24	28	32
11.3	15.8	18.3	22	25.5	29
10.9	15.4	17.8	21.5	25	28.5
3.3	4.65	5	6	7	8
T30	T40	T50	T55	T55	T60
5.6	6.75	8.95	11.35	11.35	13.45
1.8	2.5	2.7	3.5	3.7	4.1
1.4	2.1	2.3	3.02	3.22	3.62
2	2.5	3	3.5	4	4
1.5	2	2.5	2.5	2.5	3
2.5	3.2	3.8	4.3	5	5

Similar Standards

1		[ISO] ISO 14581 - 2013	Fasteners — Hexalobular Socket Countersunk Flat Head Screws View Suppliers
2		[GB] GB /T 2673.1 - 2018	Hexalobular Socket Countersunk Flat Head Screws View Suppliers
3		[GB] GB 2673 - 1986	Hexagon lobular socket countersunk head screws View Suppliers
4		[GB] GB /T 2673 - 2007	Hexalobular Lobular Socket Countersunk Head Screws View Suppliers
5		[ASME] ASME B 18.6.3 (T2-VI) - 2013	82° Hexalobular Socket Countersunk Flat Head Screws
6		[ISO] ISO 14582 - 2013	Hexalobular Socket Countersunk Head Screws, High Head
7		[NF] NF E 25-107 - 2007	Screws With Six Lobes Recessed Countersunk Head - Symbol FX
8		[GB] GB /T 2673.2 - 2020	Hexalobular Socket High Countersunk Head Screws
9		[ASTM] ASTM 18.3 (Table 8-III) - 2012	Hexagon Socket Flat Countersunk Head Cap