GB /T 70.3 - 2023 Hexagon Socket Countersunk Head Screws with Reduced Loadability

Unit: 毫米(mm)

Thread Size
d

M2.5

P	Pitch
b	Ref.
d_k	Theoretical	max
	Actual	max
		min
d_s	max
	min
e	Ref.	min
k	Ref.	max
		min
r	min
s	Nominal Size
	max
	min
t	max
	min
Minimum tensile load(N)	8.8^②
	10.9^②
	12.9^②
	50^③
	70^③
	80^③

0.4	0.45	0.5
/	/	18
4.7	5.88	6.72
4.09	5.08	5.81
3.7	4.8	5.54
2	2.5	3
1.86	2.36	2.86
1.5	1.733	2.303
1.35	1.69	1.86
1.13	1.408	1.522
0.1	0.1	0.1
1.3	1.5	2
1.36	1.56	2.08
1.32	1.52	2.02
0.85	1.15	1.25
0.75	1	1.1
1330	2180	3220
1730	2820	4180
2020	3310	4910
830	1360	2010
1160	1900	2810
1330	2180	3220

Thread Length
b

①,e mim=1.14 S min
②,80% of the values for F_m,min as specified in GB/T 3098.1.
③,80% of the values for F_m,min as specified in GB/T 3098.6.
④,a ≤ 2P.

GB /T 70.3 - 2008

Hexagon Socket Countersunk Head Screws
Suppliers(2)

GB /T 70.3 - 2000

Hexagon Socket Countersunk Head Screws
Suppliers(2)

IFI 535 - 1982

Metric Socket Countersunk Head Cap Screws

DIN 7991 - 1986

Hexagon Socket Countersunk Head Cap Screws
Suppliers(6)

ISO 10642 - 2019

Hexagon Socket Countersunk Head Screws with Reduced Loadability
Suppliers(3)

ISO 10642 - 2004

Hexagon Socket Countersunk Head Screws
Suppliers(3)

ISO 10642 - 1997

Hexagon Socket Countersunk Head Screws
Suppliers(3)

JIS B 1194 - 2006

Hexagon Socket Countersunk Head Screws

Q 250

Hexagon Socket Countersunk Head Screws

ASME/ANSI B 18.3 - 2003 (R2008)

Spline Socket Flat Countersunk Head Cap Screws

ASME/ANSI B 18.3.5M - 1993

Metric Hexagon Socket Countersunk Head Screws

ASME/ANSI B 18.3.5M - 1986

Metric Hexagon Socket Countersunk Head Screws

ASME/ANSI B 18.3.5M - 1986 (R2008)

Metric Hexagon Socket Countersunk Head Cap Screws (ASTM F835M / F879M / A1-70)

UNI 5933 - 1988

Hexagon Socket Countersunk Head Screws - ISO Metric Coarse Pitch Thread - Product Grade A

NF E 25-146 - 2004

Hexagon Socket Countersunk Head Screws

BS 4168-8 - 1982

Metric Hexagon Socket Countersunk Head Screws

BS 2470 - 1973

Hexagon Socket Countersunk Head Screws - Unified Thread

CNS 4558 - 1981

Hexagon Socket Countersunk Head Screws

DIN EN ISO 10642 - 2020

Hexagon Socket Countersunk Head Screws
Suppliers(6)

DIN EN ISO 10642 - 2013

Hexagon Socket Countersunk Head Screws
Suppliers(6)

DIN EN ISO 10642 - 2004

Hexagon Socket Countersunk Head Screws
Suppliers(6)

IS 6761 - 1994 (R2004)

Countersunk Head Screws with Hexagon Socket

ASME B 18.3 (T8) - 2012

Hexagon Socket Flat Countersunk Head Cap Screws [Table 8] (ASTM F835 / F879)
Suppliers(1)

ASME B 18.3 - 2003 (R2008)

Hexagon Socket Flat Countersunk Head Cap Screws
Suppliers(1)

Suzhou Yongchuang Fastener Factory
Contact:	Mr. Tang
Cellphone：	+86-15298892886
QQ：	546348066
email：	syjgjsz@163.com
Material: stainless steel, carbon steel; Nominal diameter: M1-M14; Nominal length: 5-400mm

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 70.3
ISO	ISO 10642
DIN	DIN EN ISO 10642
UNI	UNI 5933
Some of the above standards may be approximate equivalent. If there is any objection, the standard original shall prevail.