4. 直徑與牙數的标準系列
直徑與牙數标準組合系列應符合表1的規定。在表内，應選擇與直徑處于同一行内的牙數。
優先選用第一系列直徑。
對一般機械工程和商品緊固件，應優先選擇粗牙(UNC或UNRC)和細牙(UNF或UNRF)系列。如需要更小螺距的螺紋，則選擇超細牙系列(UNEF或UNREF)。粗牙、細牙和超細牙系列統稱為分類螺距系列。
當分類螺距系列無法滿足使用需求時，從8個恒定螺距系列(UN或UNR)中選取牙數。在恒定螺距系列中，優先選取8牙、12牙和16牙系列，不推薦選用括号内的牙數(4牙)。
6. 螺紋尺寸的米制化
先按英寸單位計算螺紋直徑的極限尺寸(最終尺寸)，然後利用1英寸等于25.4毫米進行米制尺寸轉化，最後進行米制尺寸的圓整。
本标準表1内的基本大徑是計算螺紋中徑和小徑基本尺寸，以及計算中徑公差和内螺紋小徑公差的依據，不宜代入米制形式的基本大徑進行有關尺寸和公差計算。
牙數的倒數是螺距，螺距是計算螺紋中徑和小徑基本尺寸以及螺紋公差的依據，不宜代入米制形式的螺距進行有關尺寸和公差計算。
基本大徑和螺距的米制尺寸可以作為螺紋檢驗、螺紋刀具和量規設計的參考尺寸。基本大徑和螺距的米制轉化值分别見表A.1和表A.2。
公稱直徑 | 基本 | 牙數/in n | |||||||||||
分類螺距系列 | 恒定螺距系列 | ||||||||||||
第一 | 第二 | 粗牙 | 細牙 | 超細牙 | 4 | 6 | 8 | 12 | 16 | 20 | 28 | 32 | |
0 |
| 0.0600 |
| 80 |
|
|
|
|
|
|
|
|
|
| 1 | 0.0730 | 64 | 72 |
|
|
|
|
|
|
|
|
|
2 |
| 0.0860 | 56 | 64 |
|
|
|
|
|
|
|
|
|
| 3 | 0.0990 | 48 | 56 |
|
|
|
|
|
|
|
|
|
4 |
| 0.1120 | 40 | 48 |
|
|
|
|
|
|
|
|
|
5 |
| 0.1250 | 40 | 44 |
|
|
|
|
|
|
|
|
|
6 |
| 0.1380 | 32 | 40 |
|
|
|
|
|
|
|
| UNC |
8 |
| 0.1640 | 32 | 36 |
|
|
|
|
|
|
|
| UNC |
10 |
| 0.1900 | 24 | 32 |
|
|
|
|
|
|
|
| UNF |
| 12 | 0.2160 | 24 | 28 | 32 |
|
|
|
|
|
| UNF | UNEF |
1/4 |
| 0.2500 | 20 | 28 | 32 |
|
|
|
|
| UNC | UNF | UNEF |
5/16 |
| 0.3125 | 18 | 24 | 32 |
|
|
|
|
| 20 | 28 | UNEF |
3/8 |
| 0.3750 | 16 | 24 | 32 |
|
|
|
| UNC | 20 | 28 | UNEF |
7/16 |
| 0.4375 | 14 | 20 | 28 |
|
|
|
| 16 | UNF | UNEF | 32 |
1/2 |
| 0.5000 | 13 | 20 | 28 |
|
|
|
| 16 | UNF | UNEF | 32 |
9/16 |
| 0.5625 | 12 | 18 | 24 |
|
|
| UNC | 16 | 20 | 28 | 32 |
5/8 |
| 0.6250 | 11 | 18 | 24 |
|
|
| 12 | 16 | 20 | 28 | 32 |
| 11/16 | 0.6875 |
|
| 24 |
|
|
| 12 | 16 | 20 | 28 | 32 |
3/4 |
| 0.7500 | 10 | 16 | 20 |
|
|
| 12 | UNF | UNEF | 28 | 32 |
| 13/16 | 0.8125 |
|
| 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
7/8 |
| 0.8750 | 9 | 14 | 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
| 15/16 | 0.9375 |
|
| 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
1 |
| 1.0000 | 8 | 12 | 20 |
|
| UNC | UNF | 16 | UNEF | 28 | 32 |
| 1-1/16 | 1.0625 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-1/8 |
| 1.1250 | 7 | 12 | 18 |
|
| 8 | UNF | 16 | 20 | 28 |
|
| 1-3/16 | 1.1875 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-1/4 |
| 1.2500 | 7 | 12 | 18 |
|
| 8 | UNF | 16 | 20 | 28 |
|
| 1-5/16 | 1.3125 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-3/8 |
| 1.3750 | 6 | 12 | 18 |
| UNC | 8 | UNF | 16 | 20 | 28 |
|
| 1-7/16 | 1.4375 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 | 28 |
|
1-1/2 |
| 1.5000 | 6 | 12 | 18 |
| UNC | 8 | UNF | 16 | 20 | 28 |
|
| 1-9/16 | 1.5625 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
1-5/8 |
| 1.6250 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-11/16 | 1.6875 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
1.-3/4 |
| 1.7500 | 5 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-13/16 | 1.8125 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
1-7/8 |
| 1.8750 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-15/16 | 1.9375 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2 |
| 2.0000 | 4-1/2 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 2-1/8 | 2.1250 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2-1/4 |
| 2.2500 | 4-1/2 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 2-3/8 | 2.3750 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2-1/2 |
| 2.5000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 2-5/8 | 2.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 | 20 |
|
|
2-3/4 |
| 2.7500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 2-7/8 | 2.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 | 20 |
|
|
3 |
| 3.0000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 3-1/8 | 3.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-1/4 |
| 3.2500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-3/8 | 3.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-1/2 |
| 3.5000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-5/8 | 3.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-3/4 |
| 3.7500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-7/8 | 3.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4 |
| 4.0000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 4-1/8 | 4.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-1/4 |
| 4.2500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-3/8 | 4.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-1/2 |
| 4.5000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-5/8 | 4.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-3/4 |
| 4.7500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-7/8 | 4.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5 |
| 5.0000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-1/8 | 5.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-1/4 |
| 5.2500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-3/8 | 5.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-1/2 |
| 5.5000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-5/8 | 5.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-3/4 |
| 5.7500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-7/8 | 5.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
6 |
| 6.0000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
注1：對基本大徑小于1/4 in的前10個螺紋，其公稱直徑欄内所列出的自然數是公稱直徑代碼，不是公稱直徑 的英寸值。 | |||||||||||||
公稱 | 基本大徑 D、d |
| 公稱 | 基本大徑 D、d |
| 公稱 | 基本大徑 D、d | |||
in | mm | in | mm | in | mm | |||||
0 | 0.0600 | 1.5240 | 1-1/8 | 1.1250 | 28.5750 | 3-1/4 | 3.2500 | 82.5500 | ||
1 | 0.0730 | 1.8542 | 1-3/16 | 1.1875 | 30.1625 | 3-3/8 | 3.3750 | 85.7250 | ||
2 | 0.0860 | 2.1844 | 1-1/4 | 1.2500 | 31.7500 | 3-1/2 | 3.5000 | 88.9000 | ||
3 | 0.0990 | 2.5146 | 1-5/16 | 1.3125 | 33.3375 | 3-5/8 | 3.6250 | 92.0750 | ||
4 | 0.1120 | 2.8448 | 1-3/8 | 1.3750 | 34.9250 | 3-3/4 | 3.7500 | 95.2500 | ||
5 | 0.1250 | 3.1750 | 1-7/16 | 1.4375 | 36.5125 | 3-7/8 | 3.8750 | 98.4250 | ||
6 | 0.1380 | 3.5052 | 1-1/2 | 1.5000 | 38.1000 | 4 | 4.0000 | 101.6000 | ||
8 | 0.1640 | 4.1656 | 1-9/16 | 1.5625 | 39.6875 | 4-1/8 | 4.1250 | 104.7750 | ||
10 | 0.1900 | 4.8260 | 1-5/8 | 1.6250 | 41.2750 | 4-1/4 | 4.2500 | 107.9500 | ||
12 | 0.2160 | 5.4864 | 1-11/16 | 1.6875 | 42.8625 | 4-3/8 | 4.3750 | 111.1250 | ||
1/4 | 0.2500 | 6.3500 | 1-3/4 | 1.7500 | 44.4500 | 4-1/2 | 4.5000 | 114.3000 | ||
5/16 | 0.3125 | 7.9375 | 1-13/16 | 1.8125 | 46.0375 | 4-5/8 | 4.6250 | 117.4750 | ||
3/8 | 0.3750 | 9.5250 | 1-7/8 | 1.8750 | 47.6250 | 4-3/4 | 4.7500 | 120.6500 | ||
7/16 | 0.4375 | 11.1125 | 1-15/16 | 1.9375 | 49.2125 | 4-7/8 | 4.8750 | 123.8250 | ||
1/2 | 0.5000 | 12.7000 | 2 | 2.0000 | 50.8000 | 5 | 5.0000 | 127.0000 | ||
9/16 | 0.5625 | 14.2875 | 2-1/8 | 2.1250 | 53.9750 | 5-1/8 | 5.1250 | 130.1750 | ||
5/8 | 0.6250 | 15.8750 | 2-1/4 | 2.2500 | 57.1500 | 5-1/4 | 5.2500 | 133.3500 | ||
11/16 | 0.6875 | 17.4625 | 2-3/8 | 2.3750 | 60.3250 | 5-3/8 | 5.3750 | 136.5250 | ||
3/4 | 0.7500 | 19.0500 | 2-1/2 | 2.5000 | 63.5000 | 5-1/2 | 5.5000 | 139.7000 | ||
13/16 | 0.8125 | 20.6375 | 2-5/8 | 2.6250 | 66.6750 | 5-5/8 | 5.6250 | 142.8750 | ||
7/8 | 0.8750 | 22.2250 | 2-3/4 | 2.7500 | 69.8500 | 5-3/4 | 5.7500 | 146.0500 | ||
15/16 | 0.9375 | 23.8125 | 2-7/8 | 2.8750 | 73.0250 | 5-7/8 | 5.8750 | 149.2250 | ||
1 | 1.0000 | 25.4000 | 3 | 3.0000 | 76.2000 | 6 | 6.0000 | 152.4000 | ||
1-1/16 | 1.0625 | 26.9875 | 3-1/8 | 3.1250 | 79.3750 |
|
|
| ||
注：對基本大徑小于1/4 in的前10個螺紋，其公稱直徑欄内所列出的自然數是公稱直徑代碼，不是公稱直徑的英寸值。 | ||||||||||
牙數/in | 螺距 P |
| 牙數/in | 螺距 P | ||
in | mm | in | mm | |||
80 | 0.01250000 | 0.3175 | 16 | 0.06250000 | 1.5875 | |
72 | 0.01388889 | 0.3528 | 14 | 0.07142857 | 1.8143 | |
64 | 0.01562500 | 0.3969 | 13 | 0.07692308 | 1.9538 | |
56 | 0.01785714 | 0.4536 | 12 | 0.08333333 | 2.1167 | |
48 | 0.02083333 | 0.5292 | 11 | 0.09090909 | 2.3091 | |
44 | 0.02272727 | 0.5773 | 10 | 0.10000000 | 2.5400 | |
40 | 0.02500000 | 0.6350 | 9 | 0.111111111 | 2.8222 | |
36 | 0.02777778 | 0.7056 | 8 | 0.12500000 | 3.1750 | |
32 | 0.03125000 | 0.7938 | 7 | 0.14285714 | 3.6286 | |
28 | 0.03571429 | 0.9071 | 6 | 0.16666667 | 4.2333 | |
24 | 0.04166667 | 1.0583 | 5 | 0.20000000 | 5.0800 | |
20 | 0.05000000 | 1.2700 | 4.5 | 0.22222222 | 5.6444 | |
18 | 0.05555556 | 1.4111 | 4 | 0.25000000 | 6.3500 | |
Locking threads with 30 degree wedge ramp
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
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
Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation
ISO general-purpose metric screw threads─Basic dimensions
HA Thread [Figure 2]
HB Thread [Figure 4]
Symmetrical thread HC [Figure 4]
Asymmetrical thread HD [Figure 6]
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
The bar diameters for rolling general purpose screw threads
Special kind of fine screw for optical instruments
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 [Table 16]](https://imgcc.164580.com/upload/48/standard/2012/02/03/1328254371610499842.jpg)
Lag screw threads [Table 16]
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 [Table 1]](https://imgcc.164580.com/upload/48/standard/2011/07/29/1311927213993228307.jpg)
Wood thread [Table 1]
![Thread and body dimeters for wood screws [Table 1]](https://imgcc.164580.com/upload/48/standard/2024/12/23/1734937527164073998.jpg)
Thread and body dimeters for wood screws [Table 1]
![Wood thread [Table 1]](https://imgcc.164580.com/upload/48/standard/2011/04/29/1304063562598941856.jpg)
Wood thread [Table 1]
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]](https://imgcc.164580.com/upload/48/standard/2020/07/27/1595832347314908017.jpg)
Thread and point details for Type Y thread cutting screws [TABLE 6]
![Thread and point details for Type A threads [TABLE 23]](https://imgcc.164580.com/upload/48/standard/2020/07/27/1595832360911151243.jpg)
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]](https://imgcc.164580.com/upload/48/standard/2020/06/05/1591317360834420064.jpg)
Type AB, Thread Forming Tapping Screws [Table 5]
![Type B and BP, Thread Forming Tapping Screws [Table 6]](https://imgcc.164580.com/upload/48/standard/2020/06/05/1591320423186423886.jpg)
Type B and BP, Thread Forming Tapping Screws [Table 6]
