30°楔形防松螺纹的牙型应符合下图的规定(粗实线)。
外螺纹有普通螺纹(M)和MJ螺纹两种,其牙型应分别符合GB/T 192和GJB 3.1A的规定。
30°楔形防松螺纹有两种配合公差:精密级(4H/4h)和中等级(6H/6g)。
30°楔形防松内螺纹斜面大径和斜面小径与其中径具有相同的公差值(4H或6H)。
30°楔形防松内螺纹公差带位置见图2(剖面线部分)。
精密级和中等级内螺纹涂镀前的公差和直径极限尺寸应分别符合表1和表2的规定。
表1和表2内的斜面大径和斜面小径数值是牙底斜面与牙侧延长相交所形成的理论直径值。
本标准不规定涂镀后内螺纹的直径极限尺寸及其检验方法。
M外螺纹的基本尺寸和公差(4h和6g)应分别符合GB/T 196和GB/T 197的规定。
MJ外螺纹的基本尺寸和公差(4h和6g)应符合GJB 3.1A的规定。
注:在用户允许条件下,内螺纹斜面小径的最小值可以小于表1和表2的规定下限。
表1 精密级(4H)内螺纹的涂镀前公差和直径极限尺寸
螺纹规格 | 斜面大径D | 斜面小径D5 | 牙顶小径D1 | 斜面大径和斜面小径公差 TD | 牙顶小径公差TD1 | ||||
公称 直径 | 螺距 | max | min | max | min | max | min | ||
5 | 0.8 | 5.154 | 5.074 | 4.711 | 4.631 | 4.404 | 4.304 | 0.08 | 0.1 |
6 | 1 | 6.188 | 6.093 | 5.646 | 5.551 | 5.239 | 5.119 | 0.095 | 0.12 |
7 | 1 | 7.188 | 7.093 | 6.646 | 6.551 | 6.239 | 6.119 | 0.095 | 0.12 |
8 | 1 | 8.188 | 8.093 | 7.646 | 7.551 | 7.239 | 7.119 | 0.095 | 0.12 |
8 | 1.25 | 8.216 | 8.116 | 7.543 | 7.443 | 7.03 | 6.894 | 0.1 | 0.136 |
10 | 1 | 10.188 | 10.093 | 9.646 | 9.551 | 9.239 | 9.119 | 0.095 | 0.12 |
10 | 1.25 | 10.216 | 10.116 | 9.543 | 9.443 | 9.03 | 8.894 | 0.1 | 0.136 |
10 | 1.5 | 10.251 | 10.139 | 9.46 | 9.348 | 8.809 | 8.657 | 0.112 | 0.152 |
12 | 1.25 | 12.228 | 12.116 | 11.565 | 11.453 | 11.020 | 10.884 | 0.112 | 0.136 |
12 | 1.5 | 12.257 | 12.139 | 11.46 | 11.342 | 10.815 | 10.663 | 0.118 | 0.152 |
12 | 1.75 | 12.287 | 12.162 | 11.375 | 11.25 | 10.591 | 10.421 | 0 125 | 0.17 |
14 | 1.5 | 14.257 | 14.139 | 13.46 | 13.342 | 12.815 | 12.663 | 0.118 | 0.152 |
14 | 2 | 14.318 | 14.186 | 13.3 | 13.168 | 12.424 | 12.235 | 0.132 | 0.189 |
16 | 1.5 | 16.257 | 16.139 | 15.46 | 15.342 | 14.815 | 14.663 | 0.118 | 0.152 |
16 | 2 | 16.318 | 16.186 | 15.3 | 15.168 | 14.424 | 14.235 | 0.132 | 0.189 |
18 | 1.5 | 18.257 | 18.139 | 17.46 | 17.342 | 16.815 | 16.663 | 0.118 | 0.152 |
18 | 2 | 18.318 | 18.186 | 17.3 | 17.168 | 16.424 | 16.235 | 0.132 | 0.189 |
18 | 2.5 | 18.372 | 18.232 | 17.117 | 16.977 | 16 | 15.776 | 0.14 | 0.224 |
20 | 1.5 | 20.257 | 20.139 | 19.46 | 19.342 | 18.815 | 18.663 | 0.118 | 0.152 |
20 | 2 | 20.318 | 20.186 | 19.3 | 19.168 | 18.424 | 18.235 | 0.132 | 0.189 |
20 | 2.5 | 20.372 | 20.232 | 19.117 | 18.977 | 18 | 17.776 | 0.14 | 0.224 |
22 | 1.5 | 22.257 | 22.139 | 21.46 | 21.342 | 20.815 | 20.663 | 0.118 | 0.152 |
22 | 2 | 22.318 | 22.186 | 21.3 | 21.168 | 20.424 | 20.235 | 0.132 | 0 189 |
22 | 2.5 | 22.372 | 22.232 | 21.117 | 20.977 | 20 | 19.776 | 0.14 | 0.224 |
24 | 1.5 | 24.264 | 24.139 | 23.46 | 23.335 | 22.822 | 22.67 | 0.125 | 0.152 |
24 | 2 | 24.326 | 24.186 | 23.3 | 23.16 | 22.432 | 22.243 | 0.14 | 0.189 |
24 | 3 | 24.448 | 24.278 | 22.959 | 22.789 | 21.565 | 21.313 | 0.17 | 0.252 |
27 | 1.5 | 27.264 | 27.139 | 26.46 | 26.335 | 25.822 | 25.67 | 0.125 | 0.152 |
27 | 2 | 27.326 | 27.186 | 26.3 | 26.16 | 25.432 | 25.243 | 0.14 | 0.189 |
27 | 3 | 27.448 | 27.278 | 25.959 | 25.789 | 24.565 | 24.313 | 0.17 | 0.252 |
30 | 1.5 | 30.264 | 30.139 | 29.46 | 29.335 | 28.822 | 28.67 | 0.125 | 0.152 |
30 | 2 | 30.326 | 30.186 | 29.3 | 29.16 | 28.432 | 28.243 | 0.14 | 0.189 |
30 | 3.5 | 30.505 | 30.325 | 28.765 | 28.585 | 27.153 | 26.869 | 0.18 | 0.284 |
33 | 2 | 33.326 | 33.186 | 32.3 | 32.16 | 31.432 | 31.243 | 0.14 | 0.189 |
33 | 3.5 | 33.505 | 33.325 | 31.765 | 31.585 | 30.153 | 29.869 | 0.18 | 0.284 |
36 | 2 | 36.326 | 36.186 | 35.3 | 35.16 | 34.432 | 34.243 | 0.14 | 0.189 |
36 | 3 | 36.448 | 36.278 | 34.959 | 34.789 | 33.565 | 33.313 | 0.17 | 0.252 |
36 | 4 | 36.561 | 36.371 | 34.591 | 34.401 | 32.703 | 32.403 | 0.19 | 0.3 |
39 | 2 | 39.326 | 39.186 | 38.3 | 38.16 | 37.432 | 37.243 | 0. 14 | 0.189 |
39 | 3 | 39.448 | 39.278 | 37.959 | 37.789 | 36.565 | 36.313 | 0.17 | 0.252 |
39 | 4 | 39.561 | 39.371 | 37.591 | 37.401 | 35.703 | 35.403 | 0.19 | 0.3 |
注:螺纹牙侧位置决定螺纹中径的大小;螺纹中径决定牙底斜面的长短。在30°牙侧角和斜面倾角条件下,斜面大径和斜面小径与螺纹中径的数学关系为D2=2D-D5-0.866 025 404P。 |
表2 中等级(6H)内螺纹涂镀前的公差和直径极限尺寸
螺纹规格 | 斜面大径D | 斜面小径D5 | 牙顶小径D1 | 斜面大径和斜面小径公差 TD | 牙顶小径公差TD1 | ||||
公称 直径 | 螺距 | max | min | max | min | max | min | ||
10 | 1.5 | 10.269 | 10.089 | 9.428 | 9.248 | 8.893 | 8.657 | 0.18 | 0.236 |
12 | 1.5 | 12.279 | 12.089 | 11.432 | 11.242 | 10.899 | 10.663 | 0.19 | 0.236 |
12 | 1.75 | 12.303 | 12.103 | 11.332 | 11.132 | 10.686 | 10.421 | 0.2 | 0.265 |
14 | 1.5 | 14.279 | 14.089 | 13.432 | 13.242 | 12.899 | 12.663 | 0.19 | 0.236 |
14 | 2 | 14.33 | 14.118 | 13.244 | 13.032 | 12.535 | 12.235 | 0.212 | 0.3 |
16 | 1.5 | 16.279 | 16.089 | 15.432 | 15.242 | 14.899 | 14.663 | 0.19 | 0.236 |
16 | 2 | 16.33 | 16.118 | 15.244 | 15.032 | 14.535 | 14.235 | 0.212 | 0.3 |
18 | 1.5 | 18.279 | 18.089 | 17.432 | 17.242 | 16.899 | 16.663 | 0.19 | 0.236 |
18 | 2 | 18.33 | 18.118 | 17.244 | 17.032 | 16.535 | 16.235 | 0.212 | 0.3 |
18 | 2.5 | 18.372 | 18.148 | 17.033 | 16.809 | 16.131 | 15.776 | 0.224 | 0.355 |
20 | 1.5 | 20.279 | 20.089 | 19.432 | 19.242 | 18.899 | 18.663 | 0.19 | 0.236 |
20 | 2 | 20.33 | 20.118 | 19.244 | 19.032 | 18.535 | 18.235 | 0.212 | 0.3 |
20 | 2.5 | 20.372 | 20.148 | 19.033 | 18.809 | 18.131 | 17.776 | 0.224 | 0.355 |
22 | 1.5 | 22.279 | 22.089 | 21.432 | 21.242 | 20.899 | 20.663 | 0.19 | 0.236 |
22 | 2 | 22.33 | 22.118 | 21.244 | 21.032 | 20.535 | 20.235 | 0.212 | 0.3 |
22 | 2.5 | 22.372 | 22.148 | 21.033 | 20.809 | 20.131 | 19.776 | 0.224 | 0.355 |
24 | 2 | 24.342 | 24.118 | 23.248 | 23.024 | 22.543 | 22.243 | 0.224 | 0.3 |
24 | 3 | 24.442 | 24.177 | 22.852 | 22.587 | 21.713 | 21.313 | 0.265 | 0.4 |
27 | 2 | 27.342 | 27.118 | 26.248 | 26.024 | 25.543 | 25.243 | 0.224 | 0.3 |
27 | 3 | 27.442 | 27.177 | 25.852 | 25.587 | 24.713 | 24.313 | 0.265 | 0.4 |
30 | 2 | 30.342 | 30.118 | 29.248 | 29.024 | 28.543 | 28.243 | 0.224 | 0.3 |
30 | 3.5 | 30.487 | 30.207 | 28.629 | 28.349 | 27.319 | 26.869 | 0.28 | 0.45 |
33 | 2 | 33.342 | 33.118 | 32.248 | 32.024 | 31.543 | 31.243 | 0.224 | 0.3 |
33 | 3.5 | 33.487 | 33.207 | 31.629 | 31.349 | 30.319 | 29.869 | 0.28 | 0.45 |
36 | 3 | 36.442 | 36.177 | 34.852 | 34.587 | 33.713 | 33.313 | 0.265 | 0.4 |
36 | 4 | 36.536 | 36.236 | 34.431 | 34.131 | 32.878 | 32.403 | 0.3 | 0.475 |
39 | 3 | 39.442 | 39.177 | 37.852 | 37.587 | 36.713 | 36.313 | 0.265 | 0.4 |
39 | 4 | 39.536 | 39.236 | 37.431 | 37.131 | 35.878 | 35.403 | 0.3 | 0.475 |
中等级公差只用于螺距不小于1.5mm的螺纹规格。 注:螺纹牙侧位置决定螺纹中径的大小;螺纹中径决定牙底斜面的长短。在30°牙侧角和斜面倾角条件下,斜面大径和斜面小径与螺纹中径的数学关系为D2=2D-D5-0.866 025 404P。 |
Miniature screw threads : Profiles , general plan and basic dimensions
General purpose metric screw threads - Tolerances
The blank diameters for rolling general purpose metric screw threads
Dryseal pipe threads with the thread angle of 60 degrees
Internal thread for wire thread inserts
Buttress Thread with the Flank Angles of 3 and 30 Degrees - Part 1: Profiles
Metric threads where pressure-tight joints are made on the threads
General purpose metric screw threads - Limits of sizes
Unified screw threads - General plan
Trapezoidal screw threads - Part 1: Profiles
General purpose metric screw threads - The plan for pipe systems
General purpose metric screw threads-Basic profile(ISO 68-1:1998, MOD)
General purpose metric screw threads - Basic dimenslons
General purpose metric screw threads - Limit deviations
General purpose metric screw threads - Preferable plan
General purpose metric screw threads - Limits of sizes for the screw threads of medium quality and preferable plan
General purpose metric screw threads - Limits of sizes for the screw threads of coarse quality and preferable plan
Tapping screws thread
Pipe Threads with 55 Degree Thread Angle where Pressure-Tight Joints are not Made on the Threads
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)
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)
The interference-fit threads
Run-outs, undercuts and chamfers for general purpose metric screw threads (ISO 3508:1976 / ISO 4755:1983)
The threads for transition fit
Pipe threads where pressure-tight joints are made on the threads
Screws thread shanks for thread forming screw-Metric coarse thread series
Specification for wood screws
Metric triangle lock with thread end
Metric Self-tapping Thread End
Whitworth pipe threads for pipe unions
Plastic threads
Threads and thread ends for tapping screws
ISO - Metric Trapezoidal Screw Threads
Thread and thread ends for wood screws
Bolted Connections with Reduced Shank; Metric Thread with Large Clearence, Nominal Dimensions and Limits
Aerospace - Lead and runout threads - Part 1: Rolled external threads
ISO metric trapezoidal screw threads - Basic and design profiles
ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data
Fasteners─Bolts,screws and studs─Nominal lengths and thread lengths
ISO inch screw threads─Basic dimensions
Pipe threads where pressure-tight joints are not made on the threads
Tapping Screws Thread
ISO general purpose metric screw threads - General plan
ISO general purpose metric screw threads — Selected sizes for screws, bolts and nuts
Limits of sizes for general purpose external and internal screw threads
Deviations for constructional screw threads
ISO general-purpose metric screw threads─Basic dimensions
Tapping Screw Threads and Ends
Limit gauges for metric screw threads
Tapping screw threads and ends
Limits of sizes and tolerances for metric coarse screw threads
Tapping Screw Threads and Ends
Locking Thread with 30° wedge ramp
Dimensions of Threads and Points for Type AB and Type ABR Thread-forming Screws
Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws
Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws
Thread Lengths for Type A, AB, B, BF, BP and BT Tapping Screws
Thread Lengths for Type C, D, F, G, T and TRS Tapping Screws
Lag screw threads
AB self-tapping teeth
self-tapping teeth-B
Self-tapping teeth-BF
Triangle lock self-tapping teeth--D、F、G
Threaded rods(inch series) (A307, F1554, A193, CRES,F593,F468)
Wood thread
Wood thread
Thread and body dimeters for wood screws
Pipe threads where pressure tight joints are made on the threads - Part 1 : Taper external threads and parallel internal threads - Dimensions, tolerances and designation
US triangle lock thread-S type
Metric triangle lock thread-S type
Metric triangle lock thread-C type
Metric triangle lock thread-B type
Metric triangle lock thread-P type
Thread and point details for Type Y thread cutting screws [TABLE 6]
Thread and point details for Type A threads [TABLE 23]
Screw Threads - UNJ Profile, Inch
Tapping thread for nylon lock
Screw Threads for Thread Forming Tapping Screws - Dimensions
ISO general purpose metric screw threads - General plan
Thread Lengths for Types A, AB, B, BF, BP, and BT Tapping Screws
Thread Lengths for Types C, D, F, G, T, and TRS Tapping Screws
Dimensions of Threads and Points for Types AB and ABR Thread-Forming Tapping Screws
Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws
Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws
Type AB, Thread Forming Tapping Screws [Table 5]
Type B and BP, Thread Forming Tapping Screws [Table 6]
Type A, Thread Forming Tapping Screws [Table E1]
Typ C, Thread Forming Tapping Screws [Table V1]