GB /T 3 - 1997 Run-outs, undercuts and chamfers for general purpose metric screw threads (ISO 3508:1976 / ISO 4755:1983)

外螺紋

1.1 外螺紋收尾和肩距的型式與尺寸按圖 1 和表 1 的規定。螺紋收尾的牙底圓弧半徑不應小于對完整螺紋規定的最小牙底圓弧半徑。

表 1 （mm）

螺距 P	收尾 x （max）		肩距 a (max)
螺距 P	一般	短的	一般	長的	短的
0.2	0.5	0.25	0.6	0.8	0.4
0.25	0.6	0.3	0.75	1	0.5
0.3	0.75	0.4	0.9	1.2	0.6
0.35	0.9	0.45	1.05	1.4	0.7
0.4	1	0.5	1.2	1.6	0.8
0.45	1.1	0.6	1.35	1.8	0.9
0.5	1.25	0.7	1.5	2	1
0.6	1.5	0.75	1.8	2.4	1.2
0.7	1.75	0.9	2.1	2.8	1.4
0.75	1.9	1	2.25	3	1.5
0.8	2	1	2.4	3.2	1.6
1	2.5	1.25	3	4	2
1.25	3.2	1.6	4	5	2.5
1.5	3.8	1.9	4.5	6	3
1.75	1.3	2.2	5.3	7	3.5
2	5	2.5	6	8	4
2.5	6.3	3.2	7.5	10	5
3	7.5	3.8	9	12	6
3.5	9	4.5	10.5	14	7
4	10	5	12	16	8
4.5	11	5.5	13.5	18	9
5	12.5	6.3	15	20	10
5.5	14	7	16.5	22	11
6	15	7.5	18	24	12
參考值	≈2.5 P	≈1.25 P	≈3 P	=4 P	=2 P

注：應優先選用“一般”長度的收尾和肩距；短”收尾和“短”肩距僅用于結構受限制的螺紋件上；產品等級為B 或C級的螺紋緊固件可采用“長”肩距。

1.2 外螺紋退刀槽的型式和尺寸按圖 2 和表 2 的規定。過度角（α）不應小于30°。

表 2 （mm）

螺距 P	g₂ （max）	g₁ （min）	d_g	r ≈
0.25	0.75	0.4	d-0.4	0.12
0.3	0.9	0.5	d-0.5	0.16
0.35	1.05	0.6	d-0.6	0.16
0.4	1.2	0.6	d-0.7	0.2
0.45	1.35	0.7	d-0.7	0.2
0.5	1.5	0.8	d-0.8	0.2
0.6	1.8	0.9	d-1	0.4
0.7	2.1	1.1	d-1.1	0.4
0.75	2.25	1.2	d-1.2	0.4
0.8	2.4	1.3	d-1.3	0.4
1	3	1.6	d-1.6	0.6
1.25	3.75	2	d-2	0.6
1.5	4.5	2.5	d-2.3	0.8
1.75	5.25	3	d-2.6	1
2	6	3.4	d-3	1
2.5	7.5	4.4	d-3.6	1.2
3	9	5.2	d-4.4	1.6
3.5	10.5	6.2	d-5	1.6
4	12	7	d-5.7	2
4.5	13.5	8	d-6.4	2.5
5	15	9	d-7	2.5
5.5	17.5	11	d-7.7	3.2
6	18	11	d-8.3	3.2
參考值	≈3 P	/	/	/

注： 1. d 為螺紋公稱直徑代号。

2. dg 公差為：h13 ( d > 3mm )；
h12 ( d ≤ 3mm )。

1.3 外螺紋始端端面的倒角一般為 45°，也可采用 60°或 30°倒角；倒角深度應大于或等于螺紋牙型高度。對搓（滾）絲加工的外螺紋，其始端不完整螺紋的軸向長度不能大于 2P。

内螺紋

3.1 内螺紋收尾和肩距的型式與尺寸按圖3 和表3 的規定。

表 3 （mm）

螺距 P	收尾 X max		肩距 A
螺距 P	一般	短的	一般	長的
0.2	0.8	0.4	1.2	1.6
0.25	1	0.5	1.5	2
0.3	1.2	0.6	1.8	2.4
0.35	1.4	0.7	2.2	2.8
0.4	1.6	0.8	2.5	3.2
0.45	1.8	0.9	2.8	3.6
0.5	2	1	3	4
0.6	2.4	1.2	3.2	4.8
0.7	2.8	1.4	3.5	5.6
0.75	3	1.5	3.8	6
0.8	3.2	1.6	4	6.4
1	4	2	5	8
1.25	5	2.5	6	10
1.5	6	3	7	12
1.75	7	3.5	9	14
2	8	4	10	16
2.5	10	5	12	18
3	12	6	14	22
3.5	14	7	16	24
4	16	8	18	26
4.5	18	9	21	29
5	20	10	23	32
5.5	22	11	25	35
6	24	12	28	38
參考值	= 4P	= 2P	≈ 6~5P	≈ 8~6.5P

注: 應優先選用“一般”長度的收尾和肩距；容屑需要較大空間時可選用“長”肩距，結構限制時可選用“短”收尾。

3.2 内螺紋退刀槽的型式與尺寸按圖4 和表4 的規定。

表 4 （mm）

螺距 P	G₁		D_g	R ≈
螺距 P	一般	短的	D_g	R ≈
0.5	2	1	D+0.3	0.2
0.6	2.4	1.2		0.3
0.7	2.8	1.4		0.4
0.75	3	1.5		0.4
0.8	3.2	1.6		0.4
1	4	2	D+0.5	0.5
1.25	5	2.5		0.6
1.5	6	3		0.8
1.75	7	3.5		0.9
2	8	4		1
2.5	10	5		1.2
3	12	6		1.5
3.5	14	7		1.8
4	16	8		2
4.5	18	9		2.2
5	20	10		2.5
5.5	22	11		2.8
6	24	12		3
參考值	= 4P	= 2P	/	≈0.5 P

注：
1. “短”退刀槽僅在結構受限制時采用。
2. Dg 公差為 H13。
3. D 為螺紋公稱直徑代号。

3.3 内螺紋入口端面的倒角一般為 120°，也可采用 90°倒角；端面倒角直徑為：（1.05～1)D。

GB /T 37462 - 2019

Locking threads with 30 degree wedge ramp

GB /T 15054.1 - 2018

Miniature screw threads : Profiles , general plan and basic dimensions

GB /T 197 - 2018

General purpose metric screw threads - Tolerances

GB /T 18685 - 2017

The blank diameters for rolling general purpose metric screw threads

GB /T 12716 - 2011

GB /T 27944 - 2011

Dryseal pipe threads with the thread angle of 60 degrees

GB /T 24425.5 - 2009

Internal thread for wire thread inserts

GB /T 13576.1 - 2008

Buttress Thread with the Flank Angles of 3 and 30 Degrees - Part 1: Profiles

GB /T 1415 - 2008

Metric threads where pressure-tight joints are made on the threads

GB /T 15756 - 2008

General purpose metric screw threads - Limits of sizes

GB /T 20670 - 2006

Unified screw threads - General plan

GB /T 5796.1 - 2005

Trapezoidal screw threads - Part 1: Profiles

GB /T 1414 - 2003

General purpose metric screw threads - The plan for pipe systems

GB /T 192 - 2003

General purpose metric screw threads-Basic profile（ISO 68-1:1998, MOD）

GB /T 196 - 2003

General purpose metric screw threads - Basic dimenslons

GB /T 2516 - 2003

General purpose metric screw threads - Limit deviations

GB /T 9144 - 2003

General purpose metric screw threads - Preferable plan

GB /T 9145 - 2003

General purpose metric screw threads - Limits of sizes for the screw threads of medium quality and preferable plan

GB /T 9146 - 2003

General purpose metric screw threads - Limits of sizes for the screw threads of coarse quality and preferable plan

GB /T 5280 - 2002

Tapping screws thread

GB /T 7307 - 2001

Pipe Threads with 55 Degree Thread Angle where Pressure-Tight Joints are not Made on the Threads

GB /T 7306.1 - 2000

Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads一 Parallel internal and taper external threads（eqv ISO 7-1:1994）

GB /T 7306.2 - 2000

Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads一 Taper internal and external threads（eqv ISO 7-1:1994）

GB /T 1181 - 1998

The interference-fit threads

GB 1167 - 1996

The threads for transition fit

GB 7306 - 1987

Pipe threads where pressure-tight joints are made on the threads

GB /T 6559 - 1986

Screws thread shanks for thread forming screw-Metric coarse thread series

GB /T 922 - 1986

Specification for wood screws

IFI 502 - 1982

Metric triangle lock with thread end

IFI 502 - 1982

Metric Self-tapping Thread End

DIN 3858 - 2005

Whitworth pipe threads for pipe unions

DIN 7505 - 1986

Plastic threads

DIN 7970 - 1984

Threads and thread ends for tapping screws

DIN 103 - 1 - 1977

ISO - Metric Trapezoidal Screw Threads

DIN 7998 - 1975

Thread and thread ends for wood screws

DIN 2510-2 - 1971

Bolted Connections with Reduced Shank; Metric Thread with Large Clearence, Nominal Dimensions and Limits

ISO 3353-1 - 2020

Aerospace - Lead and runout threads - Part 1: Rolled external threads

ISO 2901 - 2016

ISO metric trapezoidal screw threads - Basic and design profiles

ISO 965-1 - 2013

ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data

ISO 888 - 2012

Fasteners─Bolts,screws and studs─Nominal lengths and thread lengths

ISO 725 - 2009

ISO inch screw threads─Basic dimensions

ISO 228-1 - 2000

Pipe threads where pressure-tight joints are not made on the threads

ISO 1478 - 1999

Tapping Screws Thread

ISO 261 - 1998

ISO general purpose metric screw threads - General plan

ISO 262 - 1998

ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts

ISO 965-2 - 1998

Limits of sizes for general purpose external and internal screw threads

ISO 965-3 - 1998

Deviations for constructional screw threads

ISO 7-1 - 1994

Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation

ISO 724 - 1993

ISO general-purpose metric screw threads─Basic dimensions

ISO 5835 (F2) - 1991

HA Thread [Figure 2]

ISO 5835 (F4) - 1991

HB Thread [Figure 4]

ISO 9268 (F4) - 1988

Symmetrical thread HC [Figure 4]

ISO 9268 (F6) - 1988

Asymmetrical thread HD [Figure 6]

JIS B 1125 (1) - 2015

Tapping Screw Threads and Ends

JIS B 0251 - 2008

Limit gauges for metric screw threads

JIS B 1125 (1) - 2003

Tapping screw threads and ends

JIS B 0203 - 1999

Taper pipe threads

JIS B 0209 - 1997

Limits of sizes and tolerances for metric coarse screw threads

JIS B 1125 (1) - 1995

Tapping Screw Threads and Ends

JB /T 10971 - 2010

Locking Thread with 30° wedge ramp

JB /T 9193 - 1999

The bar diameters for rolling general purpose screw threads

JB /T 9313 - 1999

Special kind of fine screw for optical instruments

ASME/ANSI B 18.6.3 (T40) - 2013

Dimensions of Threads and Points for Type AB and Type ABR Thread-forming Screws

ASME/ANSI B 18.6.3 (T41) - 2013

Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws

ASME/ANSI B 18.6.3 (T42) - 2013

Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws

ASME/ANSI B 18.6.3 (T46) - 2013

Thread Lengths for Type A, AB, B, BF, BP and BT Tapping Screws

ASME/ANSI B 18.6.3 (T47) - 2013

Thread Lengths for Type C, D, F, G, T and TRS Tapping Screws

ASME/ANSI B 18.2.1 (T16) - 2010

Lag screw threads [Table 16]

ASME/ANSI B 18.6.3 - 2010

AB self-tapping teeth

ASME/ANSI B 18.6.3 - 2010

self-tapping teeth-B

ASME/ANSI B 18.6.3 - 2010

Self-tapping teeth-BF

ASME/ANSI B 18.6.3 - 2010

Triangle lock self-tapping teeth--D、F、G

ASME/ANSI B 18.6.3 - 2010

ASME/ANSI B 18.31.3 - 2009

Threaded rods(inch series) (A307, F1554, A193, CRES,F593,F468)

ASME/ANSI B 18.6.1 (T1) - 1997

Wood thread [Table 1]

ASME/ANSI B 18.6.1 (T1) - 1981

Wood thread [Table 1]

ASME/ANSI B 18.6.1 (T1) - 1981 (R2016)

Thread and body dimeters for wood screws [Table 1]

EN 60423 - 2007

EN 10226-1 - 2004

Pipe threads where pressure tight joints are made on the threads - Part 1 : Taper external threads and parallel internal threads - Dimensions, tolerances and designation