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(Non-preferred) dimensions in parentheses.

Unit:mm

Slotted Countersunk Flat Head Screws

GB /T 68 - 2016

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国标GB /T68 - 2016 GB68 68GB Slotted Countersunk Flat Head Screws
Download CAD Model
国标GB /T68 - 2016 GB68 68GB Slotted Countersunk Flat Head Screws
Download CAD Model
Calculate weight and price. Weight 1000 pcs : kg x $ per kg = $ 1000 pcs
Default density g/cm3
×

Choose materials based on density.(g/cm3)

  • Carbon Steel 7.85
  • Stainless Steel 8.1
  • Stainless Steel 7.95
  • Stainless Steel 7.7
  • Titanium Alloy 4.5
  • Aluminum Alloy 2.8
  • Copper 8.89


Select here or enter material density on the calculation page.
Nominal Length L Tips:seclect Nominal Length L and get Weight Thread length.
Thread Size
d
M1.6 M2 M2.5 M3 (M3.5) M4 M5 M6 M8 M10
P Pitch
a max
b min
dk Theoretical max=nominal size
Actual max=nominal size
min
k max=nominal size
n Nominal Size
max
min
r max
t max
min
x max
0.35 0.4 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5
0.7 0.8 0.9 1 1.2 1.4 1.6 2 2.5 3
25 25 25 25 38 38 38 38 38 38
3.6 4.4 5.5 6.3 8.2 9.4 10.4 12.6 17.3 20
3 3.8 4.7 5.5 7.3 8.4 9.3 11.3 15.8 18.3
2.7 3.5 4.4 5.2 6.94 8.04 8.94 10.87 15.37 17.78
1 1.2 1.5 1.65 2.35 2.7 2.7 3.3 4.65 5
0.4 0.5 0.6 0.8 1 1.2 1.2 1.6 2 2.5
0.6 0.7 0.8 1 1.2 1.51 1.51 1.91 2.31 2.81
0.46 0.56 0.66 0.86 1.06 1.26 1.26 1.66 2.06 2.56
0.4 0.5 0.6 0.8 0.9 1 1.3 1.5 2 2.5
0.5 0.6 0.75 0.85 1.2 1.3 1.4 1.6 2.3 2.6
0.32 0.4 0.5 0.6 0.9 1 1.1 1.2 1.8 2
0.9 1 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8
Weight of per 1000 steel products(≈kg)
- - - - - - - - - -
Length of Thread b
- - - - - - - - - -
①,Try not to use the specifications in parentheses
②,When L value( M1.6~M3.0 screw)≤ 30mm, full thread should be made（b=L-k-a）;
③,When L value( M3.5~M10 screw)≤ 45mm, full thread should be made（b=L-k-a）;

Alternative history

GB 68 - 1985 GB /T 68 - 2000 GB /T 68 - 2016

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