GB /T 68 - 2016 Slotted Countersunk Flat Head Screws

Unit: 毫米(mm)

Thread Size
d

M1.6

M2.5

P	Pitch
a	max
b	min
d_k	Theoretical	max=nominal size
	Actual	max=nominal size
		min
k	max=nominal size
n	Nominal Size
	max
	min
r	max
t	max
	min
x	max

0.35	0.4	0.45
0.7	0.8	0.9
25	25	25
3.6	4.4	5.5
3	3.8	4.7
2.7	3.5	4.4
1	1.2	1.5
0.4	0.5	0.6
0.6	0.7	0.8
0.46	0.56	0.66
0.4	0.5	0.6
0.5	0.6	0.75
0.32	0.4	0.5
0.9	1	1.1

per 1000 units ≈ kg(7.85kg/cm3)

Thread Length
b

①,Try not to use the specifications in parentheses
②,When L value( M1.6~M3.0 screw)≤ 30mm, full thread should be made（b=L-k-a）;
③,When L value( M3.5~M10 screw)≤ 45mm, full thread should be made（b=L-k-a）;

GB /T 68 - 2000

Slotted Countersunk Head Screws (Commen Head Style)
Suppliers(2)

GB 68 - 1985

Slotted Countersunk Head Screws
Suppliers(2)

GB 948 - 1988

Slotted Countersunk Head Screws with Waisted Shank

IFI 513 - 1982

Metric Slotted Flat Countersunk Head Machine Screws

DIN 963 - 1990

Slotted Countersunk Head Screws
Suppliers(1)

DIN 7969 - 2017

Slotted Countersunk Head Bolts with Hexagon Nut for Steel Structures

DIN 7969 - 1989

Slotted Countersunk Head Screws for Structural Steel Bolting for Supply with or Without Nuts

DIN 8245 - 1972

Slotted Countersunk (Flat) Head Screws for Fine Mechanics; M 0.4 to M 1.4

ISO 2009 - 2011

Slotted Countersunk Flat Head Screws (Common Head Style) - Product Grade A

ISO 2009 - 1994

Slotted Countersunk Flat Head Screws (common Head Style) - Product Grade A

JIS B 1116 - 2009

Slotting Countersunk Head Screws for Fine Mechanics

JIS B 1101 (T8) - 2017

Slotted Countersunk Head Screws - Table 8

JIS B 1101 (JA4) - 2017

Slotted Countersunk Head Screws - Table JA.4

JIS B 1101 (AAT2) - 1996

Slotted Countersunk Head Screws [Annex Attached Table 2]

JIS B 1101 (AT3) - 1996

Slotted Countersunk Head Screws [Attached Table 3]

JIS B 1179 (T1-1) - 1994

Slotted Flat Head Bolts, Fine Finished [Table 1-1]

JIS B 1179 (T1-2) - 1994

Slotted Flat Head Bolts, Rough Finished [Table 1-2]

ASME/ANSI B 18.6.7M - 1998

Metric Soltted Countersunk Screws

ASME/ANSI B 18.6.3 - 2010

80° Slotted Flat Countersunk Head Machine Screws

ASME/ANSI B 18.6.3 - 2010

Slotted 100 Deg Flat Countersunk Head Screws (Machine screws only)

ASME/ANSI B 18.6.3 - 2010

Close Tolerance 100 Degree Slotted Countersunk Head Screws

ASME/ANSI B 18.6.3 - 2010

80° Slotted Undercut 82-deg Flat Countersunk Head Machine Screws

ASME/ANSI B 18.6.2 (T1) - 1998 (R2010)

Slotted Flat Countersunk Head Cap Screws [Table 1] (A307, SAE J429, F468, F593)

ASME/ANSI B 18.11 - 1961 (R1983)

Slotted 100° Flat Head Miniature Screws

UNI 6109

Slotted Countersunk Flat Head Screws

NF E 25-123 - 1994

Slotted Countersunk Flat Head Screws - Product Grade A

NF F 03-004 (F) - 1983

Railway Rolling Stock Grade A Countersunk Notched Head Machine

NF F 03-016 - 1983

Railway Rolling Stock Grade A Slotted Countersunk Head Screws Nuts Symbol FP

BS 1981 - 1991

Slotted Truncated Countersunk Head Screws: Short Length

BS 1981 - 1991

Slotted Countersunk Flat Head Screws

BS 4183 (T2) - 1967

Slotted Countersunk Head Machine Screws. Metric Series

BS 450 - 1958

Slotted 90°Countersunk Head Screws with B.S.W. & B.S.F. Threads [Table 2]

AS /NZS 1427 - 1996

ISO Metric Slotted Countersunk Head Screws [Table 1]

CNS 9678 - 1982

Slotted Countersunk Screws for Fine Mechanics

CNS 4411 - 1981

Slotted Countersunk Head Screws

CNS 4420 - 1981

Slotted Countersunk Head Bolts

CNS 4363 - 1980

Slotted Countersunk Head Screws for Fine Mechanics

GOST 17475 - 1980

Countersunk Head Screws of Accuracy Classes A and B（Slotted）

KS B 1021 (T5) - 2012 (R2022)

Slotted Countersunk Flat Head Screws [Table 5]

DIN EN ISO 2009 - 2011

Slotted Countersunk Flat Head Screws(Common Head Style)-Product Grade A
Suppliers(1)

GJB 3371 (/61) - 1998

100° Countersunk Head Bolts，Shank Tolerance f9

GJB 3372 (/36~/44) - 1998

Slotted 100 Deg Flat Countersunk Head Screws

GJB 3372 (/56) - 1998

Slotted 100 Deg Flat Countersunk Head Screws, Waisted Shank

IS 1365 - 2005

Slotted Countersunk Flat Head Screws (Common Head Style) - Product Grade A

ANSI B 18.11 - 1961 (R2017)

Slotted 100°Flat Head Miniature Screws [Table 3] (A276, B16, B151)

ASME B 18.6.3 (H1A) - 2024

82° Slotted Flat Countersunk Head Machine Screws (ASTM F837/F468) [TABLE 2.2.1-1]

ASME B 18.6.3 (H1C) - 2024

Slotted 100-deg Flat Countersunk Head Screws (ASTM F837/F468) [TABLE 2.2.1-3]

ASME B 18.6.3 (H1E) - 2024

Slotted Close Tolerance 100-deg Flat Countersunk Head Screws (ASTM F837/F468) [TABLE 2.2.1-5]

ASME B 18.6.3 (H3A) - 2024

Slotted Undercut 82-deg Flat Countersunk Head Machine Screws (ASTM F837/F468) [TABLE 2.2.3-1]

ASME B 18.6.3 (T1) - 2013

82° Slotted Flat Countersunk Head Machine Screws [Table 1] (ASTM F837 / F468)

ASME B 18.6.3 (T3) - 2013

Slotted 100-deg Flat Countersunk Head Screws [Table 3] (ASTM F837 / F468)

ASME B 18.6.3 (T5) - 2013

Slotted Close Tolerance 100-deg Flat Countersunk Head Screws (Machine Screws Only) (ASTM F837 / F468)

ASME B 18.6.3 (T9) - 2013

Slotted Undercut 82-deg Flat Countersunk Head Machine Screws (ASTM F837 / F468)

QJ 2370 - 1992

Slotted Countersunk Head Screws

QJ 2373 - 1992

Slotted Countersunk Head Screws

HB 7187~7195 - 1995

100° Countersunk Head Bolts

HB 7208~7216 - 1995

Slotted 100 Deg Flat Countersunk Head Screws

Jiangsu BofanKe Precision Metal Technology Co., Ltd.
Contact:	Director Tang
Cellphone：	86-15298892886 86-15262400870
email：	syjgjsz@163.com
Material: stainless steel, carbon steel; Nominal diameter: M1-M14; Nominal length: 5-400mm

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.

GB	GB /T 68
ISO	ISO 2009
DIN	DIN EN ISO 2009
NF	NF E 25-123
Some of the above standards may be approximate equivalent. If there is any objection, the standard original shall prevail.