264 TECHNICAL INFORMATION g s s e Ødk w Øda Øds t k L 120° d ℓ ℓ 120° t w Ødk v Ødw 45° v r da ds r r f Rounded or Chamfered Head Max. Rounding Beneath Neck Interior of hexagonal hole may be chamfered. Incomplete Threaded Portion Drill Bottom (2P or Less) (Min.) (Min.) Bottom of Cone May be roughed out when it is M4 or less. To be chamfered. (Max.) Chamfering Radius b (Reference) 1. Dimensions of Sections f (Max.)=1.7r (Max.) r (Max.)= da (Max.) – ds (Max.) 2 r (Min.)= Value in the Attached Table Unit: mm Nominal of Thread (d)(2) M2 M2.5 M3 M4 M5 M6 M8 M10 M12 (M14) M16 (M18) M20 (M22) M24 (M27) M30 Pitch of Thread (P) 0.4 0.45 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 b Reference 16 17 18 20 22 24 28 32 36 40 44 48 52 56 60 66 72 dk Max. (Basis)* 3.8 4.5 5.5 7 8.5 10 13 16 18 21 24 27 30 33 36 40 45 Max.** 3.98 4.68 5.68 7.22 8.72 10.22 13.27 16.27 18.27 21.33 24.33 27.33 30.33 33.39 36.39 40.39 45.39 Min. 3.62 4.32 5.32 6.78 8.28 9.78 12.73 15.73 17.73 20.67 23.67 26.67 29.67 32.61 35.61 39.61 44.61 da Max. 2.6 3.1 3.6 4.7 5.7 6.8 9.2 11.2 13.7 15.7 17.7 20.2 22.4 24.4 26.4 30.4 33.4 ds Max. (Basis) 2 2.5 3 4 5 6 810121416182022242730 Min. 1.86 2.36 2.86 3.82 4.82 5.82 7.78 9.78 11.73 13.73 15.73 17.73 19.67 21.67 23.67 26.67 29.67 e Min. 1.73 2.30 2.87 3.44 4.58 5.72 6.86 9.15 11.43 13.72 16.00 16.00 19.44 19.44 21.73 21.73 25.15 f Max. 0.51 0.51 0.51 0.60 0.60 0.68 1.02 1.02 1.45 1.45 1.45 1.87 2.04 2.04 2.04 2.89 2.89 k Max. (Basis) 2 2.5 3 4 5 6 810121416182022242730 Min. 1.86 2.36 2.86 3.82 4.82 5.70 7.64 9.64 11.57 13.57 15.57 17.57 19.48 21.48 23.48 26.48 29.48 r Min. 0.1 0.1 0.1 0.2 0.2 0.25 0.4 0.4 0.6 0.6 0.6 0.6 0.8 0.8 0.8 1 1 s Nominal (Basis) 1.5 2 2.5 3 4 5 6 8101214141717191922 Min. 1.52 2.02 2.52 3.02 4.02 5.02 6.02 8.025 10.025 12.032 14.032 14.032 17.05 17.050 19.065 19.065 22.065 Max. (1) Column 1 1.560 2.060 2.580 3.080 4.095 5.140 6.140 8.175 10.175 12.212 14.212 14.212 17.230 17.230 19.275 19.275 22.275 Column 2 1.545 2.045 2.560 3.080 4.095 5.095 6.095 8.115 10.115 12.142 14.142 14.142 t Min. 1 1.1 1.3 2 2.5 3 4 5 6 7 8 9 10 11 12 13.5 15.5 v Max. 0.2 0.25 0.3 0.4 0.5 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.7 3 dw Min. 3.40 4.18 5.07 6.53 8.03 9.38 12.33 15.33 17.23 20.17 23.17 25.87 28.87 31.81 34.81 38.61 43.61 w Min. 0.55 0.85 1.15 1.4 1.9 2.3 3.3 4 4.8 5.8 6.8 7.7 8.6 9.5 10.4 12.1 13.1 Note (1): Column 1 for s (max.) is applicable to strength class 8.8, 10.9, A 2-50 and A 2-70; Column 2 should be applied to strength class 12.9. Column 1 may be applicable to strength class 12.9 in accordance with an agreement made between the delivering and receiving parties. When the nominal of thread is M20 or larger, s (max.) should be applied to all strength classes. Note (2): Nominal of thread in brackets should not be used unless it is absolutely necessary. Reference 1. A side of the head should be knurled into a straight line or crisscross pattern [ refer to JIS B 0951 (knurling pattern) ]. dk (max.) should be the value marked with**. If no knurled pattern is needed, purchasers can so specify. However, dk (max.) should be the value marked with*. 2. Recommended nominal lengths (L) for individual nominal of thread are shown within the bold lines. If L is shorter than the dotted line, the thread should be fully threaded, and the incompletely threaded part length beneath the neck should be approximately 3P. 3. ℓg (max.) and ℓg (min.) for a screw, whose length (L) exceeds the dotted line, are obtained by the equations below: ℓg(Max)=Nominal Length(L)-b ℓs(Min)=ℓg(Max)-5P GeneralTechnical Information Hexagon Socket Head Cap Screws
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