ISO 14581 - 2022 Hexalobular Socket Countersunk Flat Head Screws (common head style) with Reduced Loadability

Unit: 毫米(mm)

Thread Size
d

(M2.5)

P	Pitch
a	max
b	Ref.
d_k	theoretical	max
	actual	max
		min
d_s	≈
k	max=nominal size
	min
r	max
	min
x	max
Socket No.
A	Ref.
t	max
	min
Minimum tensile load(N)	4.8
	8.8
	10.9
	50
	70

0.4	0.45	0.5
0.8	0.9	1
25	25	25
4.4	5.5	6.3
3.8	4.7	5.5
3.5	4.4	5.2
1.7	2.15	2.6
1.2	1.5	1.65
0.985	1.224	1.369
0.5	0.6	0.8
0.1	0.1	0.1
1	1.1	1.25
T6	T8	T10
1.75	2.4	2.8
0.64	0.79	0.83
0.51	0.66	0.7
700	1140	1700
1330	2180	3220
1730	2820	4190
830	1360	2020
1170	1900	2820

per 1000 units ≈ kg(7.85kg/cm3)

Thread Length
b

GB /T 2673.2 - 2020

Hexalobular Socket High Countersunk Head Screws

GB /T 2673.1 - 2018

Hexalobular Socket Countersunk Flat Head Screws
Suppliers(1)

GB /T 2673 - 2007

Hexalobular Lobular Socket Countersunk Head Screws
Suppliers(1)

GB 2673 - 1986

Hexagon Lobular Socket Countersunk Head Screws
Suppliers(1)

ISO 14581 - 2013

Fasteners — Hexalobular Socket Countersunk Flat Head Screws
Suppliers(3)

ISO 14582 - 2013

Hexalobular Socket Countersunk Head Screws, High Head

Q 258

Hexagon Lobular Socket Countersunk Head Screws

NF E 25-107 - 2007

Screws with Six Lobes Recessed Countersunk Head - Symbol FX

YJT 4029

Suppliers(1)

DIN EN ISO 14581 - 2023

Hexalobular Socket Countersunk Flat Head Screws (Common Head Style) with Reduced Loadability

QC /T 856 - 2011

Hexalobular Socket Countersunk Head Screws

ASME B 18.3 (Table 8-III) - 2012

Hexagon Socket Flat Countersunk Head Cap
Suppliers(1)

ASME B 18.6.3 (H1B-VI) - 2024

82° Hexalobular Socket Countersunk Flat Head Screws [TABLE 2.2.1-2 VI]

ASME B 18.6.3 (T2-VI) - 2013

82° Hexalobular Socket Countersunk Flat Head Screws

JASO F 116 - 2005

T-type TORX Countersunk Head Bolts

JASO F 116 - 2005

T-type TORX Countersunk Head Machine Screws

Yuyao Hutson Metal Product Co., Ltd.
Contact:	Ma Huazhen/Xu Tianyang
Cellphone：	+86-13095941973
email：	62828345@163.com
Material: stainless steel, A2-70, A2-80, A4-70, A4-80, A2(302, 303, 304), A4(316), 410, 430; Complete specifications

GotopScrews International Co., Limited
Contact:	Manager Zhuang
Cellphone：	86-13008864675
email：	hongwei@gotopscrews.com
Material: carbon steel, alloy steel, stainless steel, copper, aluminum, titanium; Specifications: M0.6~M6; Length: 1~60mm; Surface Treatment: galvanizing, nickel plating, zinc nickel alloy, electrophoresis, dacromet, CD grain, PVD, etc.

Shanghai ATM Precision Fastening Technology Co., Ltd.
Contact:	Xu Hai
Cellphone：	+86-18621311857
QQ：	513543434
email：	asialuosi@163.com
Materials: 301, 302, 303, 304, 304L, 316, 316L, 316Ti, 317L, 310S, 321, 347, 1.4529, 1.4539, 1.4462, 1.4547, 1.4980, 904L, 2205, 2507, 2520, S32750, S32760, 1Cr13, 1Cr17, 2Cr13, 3Cr13, 14Cr17Ni2, 410, 416, 420, 430, 431, 440, 630, 631, 17-4PH, MP35N, 600, 601, 625, 660, 718, 750, 800, 825, 925, 926, C22, C276, A286, GH2132, GH4033, GH4080, GH4169, GH4145, 9C18Mo, 4Cr10Si2Mo, 35CrMoA, 42CrMoA, 40CrNiMoA, 25Cr2Mo1VA, SCM435, SCM440, 4130, 4140, 4145, A36, A307, A320, A325, A490, A574, F1554; stainless steel, alloy steel, titanium alloys, nickel-based alloys, high-temperature alloys, corrosion-resistant alloys, nickel-cobalt alloys, special alloys, and other special materials per customer specifications. Grades: A1-50, A2-50, A2-70, A2-80, A3-70, A4-70, A4-80, A4-90, A4-100, A5-80, B8, B8M, B8C, B8T, B6, B7, B7M, B16, C1-50, C1-70, C1-110, C3-80, C3-120, C4-70, D2-80, D2-100, D4-80, D4-100, D6-80, D6-100, D8-80, D8-100, P1-90, P1-120, F51, F53, F55, F60, 10.9, 12.9, 14.9, 15.9, 16.9; Other grades available upon request. Specifications: M3–M120, 1/4"–4". No limitation on product diameter or length; custom non-standard parts can be manufactured upon request. Surface Treatments: passivation, black oxide, phosphating, electrophoretic coating, zinc plating, nickel plating, chrome plating, cadmium plating, gold plating, silver plating, tin plating, copper plating, zinc diffusion, marine zinc, aluminum diffusion, aluminum spraying, Dacromet, Geomet, Teflon coating, zinc-nickel alloy plating, nickel-cobalt alloy plating, hot-dip galvanizing, ceramic composite coatings, molybdenum disulfide coating, tungsten disulfide coating, nano-coatings, and other surface finishes per customer requirements.

GB	GB /T 2673.1
ISO	ISO 14581
Some of the above standards may be approximate equivalent. If there is any objection, the standard original shall prevail.