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Click Specification

(Non-preferred) dimensions in parentheses.

Unit:mm

Countersunk Flat Head Screws (Common Head Style) with Cross Recess - Part 1: Property Class 4.8

GB /T 819.1 - 2016

Display drawing:

国标GB /T819.1 - 2016 GB819.1 819.1GB Countersunk Flat Head Screws (Common Head Style) with Cross Recess - Part 1: Property Class 4.8
Download CAD Model
国标GB /T819.1 - 2016 GB819.1 819.1GB Countersunk Flat Head Screws (Common Head Style) with Cross Recess - Part 1: Property Class 4.8
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.
Screw Thread
d
M1.6 M2 M2.5 M3 (M3.5) M4 M5 M6 M8 M10
P Pitch
a max
dk theor. max
Actual max=nominal size
min
k max=nominal size
r max
x max
Socket No.
M1 Ref.
M2 Ref.
Penetration depth Type H max
min
Type Z max
min
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
3.6 4.4 5.5 6.3 8.2 9.4 10.4 12.6 17.3 20
3.0 3.8 4.7 5.5 7.30 8.40 9.30 11.30 15.80 18.30
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 0.9 1 1.3 1.5 2 2.5
0.9 1 1.1 1.25 1.5 1.75 2 2.5 3.2 3.8
0 0 1 1 2 2 2 3 4 4
1.6 1.9 2.9 3.2 4.4 4.6 5.2 6.8 8.9 10
1.6 1.9 2.8 3 4.1 4.4 4.9 6.6 8.8 9.8
0.9 1.2 1.8 2.1 2.4 2.6 3.2 3.5 4.6 5.7
0.6 0.9 1.4 1.7 1.9 2.1 2.7 3.0 4.0 5.1
0.95 1.2 1.73 2.01 2.2 2.51 3.05 3.45 4.6 5.64
0.7 0.95 1.48 1.76 1.75 2.06 2.6 3 4.15 5.19
Weight of per 1000 steel products(≈kg)
- - - - - - - - - -
Length of Thread b min
- - - - - - - - - -
①,The diameter of the unthreaded portion is approximately equal to the diameter of the pitch or allowed to equal the major diameter of the thread.

Alternative history

GB 819 - 1976 GB 819 - 1985 GB /T 819.1 - 2000 GB /T 819.1 - 2016

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