ASME B18.2.3.3M Heavy Hex Structural Screws (Metric) Dimensions

ASME B18.2.3.3M Heavy Hex Structural Screw (Metric) Dimensions

Metric Dimensions for Heavy Hex Structural Bolts

ASME B18.2.3.3M Standard specifies the dimensions and requirements for metric heavy hex structural bolts, commonly used in structural steel connections and high-strength applications. It includes details on bolt geometry, thread specifications, and tolerance limits to ensure structural integrity and reliability. This page provides comprehensive ASME B18.2.3.3M Dimensions, including metric size charts and engineering data.

ASME B18.2.3.3M Heavy Hex Structural Screw Dimensions

Nominal Dia., D , and Thread Pitch	Body Diameter.,D _s	Width Across Flats,S	Width Across Corners, E	Head Height, K	Wrenching Height, K ₁	Washer Face Thickness,C	Washer FaceDia.,D _w
M12 × 1.75	12	11.73	21	20.67	24.25	23.35	7.76	7.24	5.2	0.6	0.3	19.6
M14 × 2	14	13.73	24	23.67	27.71	26.75	9.09	8.51	6.2	0.6	0.3	22.5
M16 × 2	16	15.73	27	26.67	31.18	30.14	10.32	9.68	7	0.8	0.4	25.3
M20 × 2.5	20	19.67	34	33	39.26	37.29	12.88	12.12	8.8	0.8	0.4	31.4
M24 × 3	24	23.67	41	40	47.34	45.2	15.44	14.56	10.5	0.8	0.4	38
M30 × 3.5	30	29.67	50	49	57.74	55.37	19.48	17.92	13.1	0.8	0.4	46.6
M36 × 4	36	35.61	60	58.8	69.28	66.44	23.38	21.72	15.8	0.8	0.4	55.9
All dimensions are in millimeters. Basic thread lengths, B, are the same as given in . Transition thread length, X, includes the length of incomplete threads and tolerances on grip gaging length and body length. It is intended for calculation purposes. For additional manufacturing and acceptance specifications, reference should be made to the Standard.

Nominal Dia., D , and Thread Pitch

Body Diameter.,D _s

Width Across Flats,S

Width Across Corners, E

Head Height, K

Wrenching Height, K ₁

Washer Face Thickness,C

Washer FaceDia.,D _w

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

M12 × 1.75

11.73

20.67

24.25

23.35

7.76

7.24

5.2

0.6

0.3

19.6

M14 × 2

13.73

23.67

27.71

26.75

9.09

8.51

6.2

0.6

0.3

22.5

M16 × 2

15.73

26.67

31.18

30.14

10.32

9.68

0.8

0.4

25.3

M20 × 2.5

19.67

39.26

37.29

12.88

12.12

8.8

0.8

0.4

31.4

M24 × 3

23.67

47.34

45.2

15.44

14.56

10.5

0.8

0.4

M30 × 3.5

29.67

57.74

55.37

19.48

17.92

13.1

0.8

0.4

46.6

M36 × 4

35.61

58.8

69.28

66.44

23.38

21.72

15.8

0.8

0.4

55.9

All dimensions are in millimeters.
Basic thread lengths, B, are the same as given in .
Transition thread length, X, includes the length of incomplete threads and tolerances on grip gaging
length and body length. It is intended for calculation purposes.
For additional manufacturing and acceptance specifications, reference should be made to the Standard.

Related Specifications

Surface Treatments

Xylan 1070 / 1014 / 1400 / 1424

Xylar 2 / 101

Geomet 321 / 500 / 720

SermaGard 1105 / 1280

Dacromet 320 / 500

TakeCoat 1000 Ceramic

Delta Tone/Seal

Magnigard

MolyKote

Sherardized

Zinc-Cobalt (ASTM B840)

Zinc-Nickel (ASTM B841)

Certifications

ISO 9001 - 2015 Certified
PED 2014/68/EC
NACE MR0175/ISO 15156-2
NORSOK M-650
DFAR
MERKBLATT AD 2000 W2/W7/W10

ASME B18.2.3.3M Heavy Hex Structural Screw (Metric) Dimensions

ASME B18.2.3.3M Heavy Hex Structural Screw Dimensions

Related Specifications

Surface Treatments

Certifications

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