普通螺纹基本尺寸 (GB/T 196—2003)                                   mm

表中数值按下列公式计算，数值圆整到小数点后第三位数；

D—内螺纹的基本大径；d—外螺纹的基本大径；D₂—内螺纹的基本中径；

d₂—外螺纹的基本中径；D₁—内螺纹的基本小径；d₁—外螺纹的基本小径；

P—螺距；H—原始三角形高度

公 称 直 径 D、d

螺 距

P

中 径

D₂ 或 d₂

小 径

D₁ 或 d₁

第一系列

第二系列

第三系列

1

0.25^①

0.838

0.729

0.2

0.870

0.783

1.1

0.25^①

0.938

0.829

0.2

0.970

0.883

1.2

0.25^①

1.038

0.929

0.2

1.070

0.983

1.4

0.3^①

1.205

1.075

0.2

1.270

1.183

1.6

0.35^①

1.373

1.221

0.2

1.470

1.383

1.8

0.35^①

1.573

1.421

0.2

1.670

1.583

2

0.4^①

1.740

1.567

0.25

1.838

1.729

2.2

0.45^①

1.908

1.713

0.25

2.038

1.929

2.5

0.45^①

2.208

2.013

0.35

2.273

2.121

3

0.5^①

2.675

2.459

0.35

2.773

2.621

3.5

(0.6)^①

3.110

2.850

0.35

3.273

3.121

4

0.7^①

3.545

3.242

0.5

3.675

3.459

4.5

(0.75)^①

4.013

3.688

0.5

4.175

3.959

5

0.8^①

4.480

4.134

0.5

4.675

4.459

5.5

0.5

5.175

4.959

6

1^①

5.350

4.917

0.75

5.513

5.188

7

1^①

6.350

5.917

0.75

6.513

6.188

8

1.25^①

7.188

6.647

1

7.350

6.917

0.75

7.513

7.188

9

(1.25)^①

8.188

7.647

1

8.350

7.917

0.75

8.513

8.188

10

1.5^①

9.026

8.376

1.25

9.188

8.647

1

9.350

8.917

0.75

9.513

9.188

11

(1.5)^①

10.026

9.376

1

10.350

9.917

0.75

10.513

10.188

12

1.75^①

10.863

10.106

1.5

11.026

10.376

1.25

11.188

10.647

1

11.350

10.917

14

2^①

12.701

11.835

1.5

13.026

12.376

(1.25)

13.188

12.647

1

13.350

12.917

15

1.5

14.026

13.376

(1)

14.350

13.917

16

2^①

14.701

13.835

1.5

15.026

14.376

1

15.350

14.917

17

1.5

16.026

15.376

(1)

16.350

15.917

18

2.5^①

16.376

15.294

2

16.701

15.835

1.5

17.026

16.376

1

17.350

16.917

20

2.5^①

18.376

17.294

2

18.701

17.835

1.5

19.026

18.376

1

19.350

18.917

22

2.5^①

20.376

19.294

2

20.701

19.835

1.5

21.026

20.376

1

21.350

20.917

24

3^①

22.051

20.752

2

22.701

21.835

1.5

23.026

22.376

1

23.350

22.917

25

2

23.701

22.835

1.5

24.026

23.376

(1)

24.350

23.917

26

1.5

25.026

24.376

27

3^①

25.051

23.752

2

25.701

24.835

1.5

26.026

25.376

1

26.350

25.917

28

2

26.701

25.835

1.5

27.026

26.376

1

27.350

26.917

30

3.5^①

27.727

26.211

(3)

28.051

26.752

2

28.701

27.835

1.5

29.026

28.376

1

29.350

28.917

32

2

30.701

29.835

1.5

31.026

30.376

33

3.5^①

30.727

29.211

(3)

31.051

29.752

2

31.701

30.835

1.5

32.026

31.376

35

1.5

34.026

33.376

36

4^①

33.402

31.670

3

34.051

32.752

2

34.701

33.835

1.5

35.026

34.376

38

1.5

37.026

36.376

39

4^①

36.402

34.670

3

37.051

35.752

2

37.701

36.835

1.5

38.026

37.376

40

(3)

38.051

36.752

(2)

38.701

37.835

1.5

39.026

38.376

42

4.5^①

39.077

37.129

(4)

39.402

37.670

3

40.051

38.752

2

40.701

39.835

1.5

41.026

40.376

45

4.5^①

42.077

40.129

(4)

42.402

40.670

3

43.051

41.752

2

43.701

42.835

1.5

44.026

43.376

48

5^①

44.752

42.587

(4)

45.402

43.670

3

46.051

44.752

2

46.701

45.835

1.5

47.026

46.376

50

(3)

48.051

46.752

(2)

48.701

47.835

1.5

49.026

48.376

52

5^①

48.752

46.587

(4)

49.402

47.670

3

50.051

48.752

2

50.701

49.835

1.5

51.026

50.376

55

(4)

52.402

50.670

(3)

53.051

51.752

2

53.701

52.835

1.5

54.026

53.376

56

5.5^①

52.428

50.046

4

53.402

51.670

3

54.051

52.752

2

54.701

53.835

1.5

55.026

54.376

58

(4)

55.402

53.670

(3)

56.051

54.752

2

56.701

55.835

1.5

57.026

56.376

60

(5.5)^①

56.428

54.046

4

57.402

55.670

3

58.051

56.752

2

58.701

57.835

1.5

59.026

58.376

62

(4)

59.402

57.670

(3)

60.051

58.752

2

60.701

59.835

1.5

61.026

60.376

64

6^①

60.103

57.505

4

61.402

59.670

3

62.051

60.752

2

62.701

61.835

1.5

63.026

62.376

65

(4)

62.402

60.670

(3)

63.051

61.752

2

63.701

62.835

1.5

64.026

63.376

68

6^①

64.103

61.505

4

65.402

63.670

3

66.051

64.752

2

66.701

65.835

1.5

67.026

66.376

70

(6)

66.103

63.505

(4)

67.402

65.670

(3)

68.051

66.752

2

68.701

67.835

1.5

69.026

68.376

72

6

68.103

65.505

4

69.402

67.670

3

70.051

68.752

2

70.701

69.835

1.5

71.026

70.376

75

(4)

72.402

70.670

(3)

73.051

71.752

2

73.701

72.835

1.5

74.026

73.376

76

6

72.103

69.505

4

73.402

71.670

3

74.051

72.752

2

74.701

73.835

1.5

75.026

74.376

78

2

76.700

75.835

80

6

76.103

73.505

4

77.402

75.670

3

78.051

76.752

2

78.701

77.835

1.5

79.026

78.376

82

2

80.701

79.835

85

6

81.103

78.505

4

82.402

80.670

3

83.051

81.752

2

83.701

82.835

90

6

86.103

83.505

4

87.402

85.670

3

88.051

86.752

2

88.701

87.835

95

6

91.103

88.505

4

92.402

90.670

3

93.051

91.752

2

93.701

92.835

100

6

96.103

93.505

4

97.402

95.670

3

98.051

96.752

2

98.701

97.835

105

6

101.103

98.505

4

102.402

100.670

3

103.051

101.752

2

103.701

102.835

110

6

106.103

103.505

4

107.402

105.670

3

108.051

106.752

2

108.701

107.835

115

6

111.103

108.505

4

112.402

110.670

3

113.051

111.752

2

113.701

112.835

120

6

116.103

113.505

4

117.402

115.670

3

118.051

116.752

2

118.701

117.835

125

6

121.103

118.505

4

122.402

120.670

3

123.051

121.752

2

123.701

122.835

130

6

126.103

123.505

4

127.402

125.670

3

128.051

126.752

2

128.701

127.835

135

6

131.103

128.505

4

132.402

130.670

3

133.051

131.752

2

133.701

132.835

140

6

136.103

133.505

4

137.402

135.670

3

138.051

136.752

2

138.701

137.835

145

6

141.103

138.505

4

142.402

140.670

3

143.051

141.752

2

143.701

142.835

150

8

144.804

141.340

6

146.103

143.505

4

147.402

145.670

3

148.051

146.752

2

148.701

147.835

155

6

151.103

148.505

4

152.402

150.670

3

153.051

151.752

160

8

154.804

151.340

6

156.103

153.505

4

157.402

155.670

3

158.051

156.752

165

6

161.103

158.505

4

162.402

160.670

3

163.051

161.752

170

8

164.804

161.340

6

166.103

163.505

4

167.402

165.670

3

168.051

166.752

175

6

171.103

168.505

4

172.402

170.670

3

173.051

171.752

180

8

174.804

171.340

6

176.103

173.505

4

177.402

175.670

3

178.051

176.752

185

6

181.103

178.505

4

182.402

180.670

3

183.051

181.752

190

8

184.804

181.340

6

186.103

183.505

4

187.402

185.670

3

188.051

186.752

195

6

191.103

188.505

4

192.402

190.670

3

193.051

191.752

200

8

194.804

191.340

6

196.103

193.505

4

197.402

195.670

3

198.051

196.752

205

6

201.103

198.505

4

202.402

200.670

3

203.051

201.752

210

8

204.804

201.340

6

206.103

203.505

4

207.402

205.670

3

208.051

206.752

215

6

211.103

208.505

4

212.402

210.670

3

213.051

211.752

220

8

214.804

211.340

6

216.103

213.505

4

217.402

215.670

3

218.051

216.752

225

6

221.103

218.505

4

222.402

220.670

3

223.051

221.752

230

8

224.804

221.340

6

226.103

223.505

4

227.402

225.670

3

228.051

226.752

235

6

231.103

228.505

4

232.402

230.670

3

233.051

231.752

240

8

234.804

231.340

6

236.103

233.505

4

237.402

235.670

3

238.051

236.752

245

6

241.103

238.505

4

242.402

240.670

3

243.051

241.752

250

8

244.804

241.340

6

246.103

243.505

4

247.402

245.670

3

248.051

246.752

255

6

251.103

248.505

4

252.402

250.670

260

8

254.804

251.340

6

256.103

253.505

4

257.402

255.670

265

6

261.103

258.505

4

262.402

260.670

270

8

264.804

261.340

6

266.103

263.505

4

267.402

265.670

275

6

271.103

268.505

4

272.402

270.670

280

8

274.804

271.340

6

276.103

273.505

4

277.402

275.670

285

6

281.103

278.505

4

282.402

280.670

290

8

284.804

281.340

6

286.103

283.505

4

287.402

285.670

295

6

291.103

288.505

4

292.402

290.670

300

8

294.804

291.340

6

296.103

293.505

4

297.402

295.670

310

6

306.103

303.505

4

307.402

305.670

320

6

316.103

313.505

4

317.402

315.670

330

6

326.103

323.505

4

327.402

325.670

340

6

336.103

333.505

4

337.402

335.670

350

6

346.103

343.505

4

347.402

345.670

360

6

356.103

353.505

4

357.402

355.670

370

6

366.103

363.505

4

367.402

365.670

380

6

376.103

373.505

4

377.402

375.670

390

6

386.103

383.505

4

387.402

385.670

400

6

396.103

393.505

4

397.402

395.670

410

6

406.103

403.505

420

6

416.103

413.505

430

6

426.103

423.505

440

6

436.103

433.505

450

6

446.103

443.505

460

6

456.103

453.505

470

6

466.103

463.505

480

6

476.103

473.505

490

6

486.103

483.505

500

6

496.103

493.505

510

6

506.103

503.505

520

6

516.103

513.505

530

6

526.103

523.505

540

6

536.103

533.505

550

6

546.103

543.505

560

6

556.103

553.505

570

6

566.103

563.505

580

6

576.103

573.505

590

6

586.103

583.505

600

6

596.103

593.505

注：①为粗牙螺距，其余为细牙螺距。

1.直径优先选用第一系列，其次第二系列，第三系列尽可能不用。

2.括号内的螺距尽可能不用。

3.M14×1.25仅用于火花塞，M35×1.5仅用于滚动轴承锁紧螺母。

4.对直径150～600mm的螺纹，需要使用螺距大于6mm的螺纹时，应优先选用8mm的螺距。