Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3227-2008 Assembly tools for screws and nuts - Driving squares for power socket tools, with the following main technical changes made:
——The figure and dimensions of circlip positioning (K-shaped) male square are added (see Figure 3 and Table 2);
——The figure and dimensions of L-shaped square hole matching circlip positioning (K-shaped) male square are added (see Figure 7 and Table 4).
This standard has been redrafted and modified in relation to ISO 1174-2:1996 Assembly tools for screws and nuts - Driving squares - Part 2: Driving squares for power socket tools.
Structural adjustments have been made to this standard with respect to ISO 1174-2:1996. Annex A lists a comparison of between this standard and ISO 1174-2:1996 in terms of clause numbers.
This standard includes technical differences with respect to ISO 1174-2:1996. The clauses and subclauses concerned are identified by a vertical single line (|) located in the blank on its external margin of the page. These technical differences and reasons are listed in Annex B.
For the convenience of application, the following editorial modifications are made in this standard:
——The standard name is modified to be consistent with the existing standard series;
——The informative Annex A to the international standard is deleted.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee 173 on Drilling Machinery and Pneumatic Tool of Standardization Administration of China.
The previous editions of the standard are as follows:
——GB/T 3227-1978, GB/T 3227-1982, GB/T 3227-1988, GB/T 3227-2000, and GB/T 3227-2008.
Assembly tools for screws and nuts - Driving squares for power socket tools
1 Scope
This standard specifies the types, dimensions and designation of the male and female driving squares for power socket tools of the assembly tools for screws and nuts.
This standard is applicable to driving squares for power socket tools of assembly tools for screws and nuts, namely male and female driving squares (hereinafter referred to as "male and female squares").
2 Normative references
The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 321-2005 Preferred numbers - Series of preferred numbers (ISO 3:1973, IDT)
GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits - Part 1: Bases of tolerances, deviations and fits (ISO 286-1:1988, MOD)
3 Types and dimensions of driving squares
3.1 The types of male square are shown in Figures 1, 2 and 3, and the dimensions are shown in Tables 1 and 2. The nominal dimensions and limit dimensions in column s1 in Tables 1 and 2 shall comply with the requirements of GB/T 321-2005 and grade IT10 in GB/T 1800.1-2009.
Figure 1 Type E (with plunger retainer)
Figure 2 Type F (with through pinhole)
Table 1 Male square dimensions, types E and F Dimensions in millimeters
Type Nominal s1 d1
h11 d2
H13 d3
min e1 l1 l3 l5 r1
max min max min max Nominal Tolerance min max
E,F 6.3 6.35 6.29 1.5 2 9.5 8.4 8.0 7.5 4 ±0.2 1.3 0.5
E,F 10 9.53 9.47 3.9 3 14.0 12.7 12.2 11.0 5.5 ±0.2 2.0 0.6
E,F 12.5 12.70 12.63 4.6 4 18.5 16.9 16.3 15.5 8 ±0.3 2.3 0.8
E,F 16 15.88 15.81 4.6 4.5 23.5 21.2 20.4 16.3 8 ±0.3 2.3 1.0
F 20 19.05 18.97 — 6 28.0 25.4 24.4 23.0 10.2 ±0.3 — 1.2
F 25 25.40 25.32 — 6.5 37.5 34.0 32.4 28.0 15 ±0.3 — 1.6
F 40 38.10 38.00 — 8 55.5 50.0 48.0 39.3 16.1 ±0.3 — 2.5
F 63 63.50 63.38 — 10 93.0 84.0 82.0 55.6 38.1 ±0.4 — 4.0
Note: r1 applies to all transition points and surfaces to the face.
Example: male square F16 GB/T 3227-2018 indicates the designation of type F male square with nominal dimension of 16 for power socket tools.
Figure 3 Type K (circlip positioning)
Table 2 Male square dimensions, type K Dimensions in millimeters
Nominal s1 d3
min d4 d5 e1 l1
max l3
max r1
max r2
max min max min max min
10 9.53 9.47 14.0 5 4.95 9.2 12.7 12.2 12.0 8.5 1.5 1.25
12.5 12.70 12.63 18.5 7.55 7.5 12.3 16.9 16.3 16.5 13 1.5 1.25
16 15.88 15.81 23.5 11.0 10.9 15.5 21.2 20.4 17.3 13.3 2.5 1.25
20 19.05 18.97 28.0 13.0 12.9 18.7 25.4 24.4 24.0 19.5 3.0 1.75
25 25.4 25.32 37.5 20.0 19.8 25.0 34.0 32.4 29.0 23.5 4.0 2.25
Example: male square K16 GB/T 3227-2018 indicates designation of type K male square with nominal dimension of 16 for power socket tools.
3.2 The types of female square are shown in Figures 4, 5, 6 and 7, and the dimensions are shown in Tables 3 and 4. The nominal dimensions and limit dimensions in column s2 in Tables 3 and 4 shall comply with the requirements of GB/T 321-2005 and grade IT11 in GB/T 1800.1-2009.
Foreword i
1 Scope
2 Normative references
3 Types and dimensions of driving squares
Annex A (Informative) Comparison of this standard and ISO 1174-2:1996 in terms of clause numbers
Annex B (Informative) Technical differences between this standard and ISO 1174-2:1996 and the reasons
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3227-2008 Assembly tools for screws and nuts - Driving squares for power socket tools, with the following main technical changes made:
——The figure and dimensions of circlip positioning (K-shaped) male square are added (see Figure 3 and Table 2);
——The figure and dimensions of L-shaped square hole matching circlip positioning (K-shaped) male square are added (see Figure 7 and Table 4).
This standard has been redrafted and modified in relation to ISO 1174-2:1996 Assembly tools for screws and nuts - Driving squares - Part 2: Driving squares for power socket tools.
Structural adjustments have been made to this standard with respect to ISO 1174-2:1996. Annex A lists a comparison of between this standard and ISO 1174-2:1996 in terms of clause numbers.
This standard includes technical differences with respect to ISO 1174-2:1996. The clauses and subclauses concerned are identified by a vertical single line (|) located in the blank on its external margin of the page. These technical differences and reasons are listed in Annex B.
For the convenience of application, the following editorial modifications are made in this standard:
——The standard name is modified to be consistent with the existing standard series;
——The informative Annex A to the international standard is deleted.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee 173 on Drilling Machinery and Pneumatic Tool of Standardization Administration of China.
The previous editions of the standard are as follows:
——GB/T 3227-1978, GB/T 3227-1982, GB/T 3227-1988, GB/T 3227-2000, and GB/T 3227-2008.
Assembly tools for screws and nuts - Driving squares for power socket tools
1 Scope
This standard specifies the types, dimensions and designation of the male and female driving squares for power socket tools of the assembly tools for screws and nuts.
This standard is applicable to driving squares for power socket tools of assembly tools for screws and nuts, namely male and female driving squares (hereinafter referred to as "male and female squares").
2 Normative references
The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 321-2005 Preferred numbers - Series of preferred numbers (ISO 3:1973, IDT)
GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits - Part 1: Bases of tolerances, deviations and fits (ISO 286-1:1988, MOD)
3 Types and dimensions of driving squares
3.1 The types of male square are shown in Figures 1, 2 and 3, and the dimensions are shown in Tables 1 and 2. The nominal dimensions and limit dimensions in column s1 in Tables 1 and 2 shall comply with the requirements of GB/T 321-2005 and grade IT10 in GB/T 1800.1-2009.
Figure 1 Type E (with plunger retainer)
Figure 2 Type F (with through pinhole)
Table 1 Male square dimensions, types E and F Dimensions in millimeters
Type Nominal s1 d1
h11 d2
H13 d3
min e1 l1 l3 l5 r1
max min max min max Nominal Tolerance min max
E,F 6.3 6.35 6.29 1.5 2 9.5 8.4 8.0 7.5 4 ±0.2 1.3 0.5
E,F 10 9.53 9.47 3.9 3 14.0 12.7 12.2 11.0 5.5 ±0.2 2.0 0.6
E,F 12.5 12.70 12.63 4.6 4 18.5 16.9 16.3 15.5 8 ±0.3 2.3 0.8
E,F 16 15.88 15.81 4.6 4.5 23.5 21.2 20.4 16.3 8 ±0.3 2.3 1.0
F 20 19.05 18.97 — 6 28.0 25.4 24.4 23.0 10.2 ±0.3 — 1.2
F 25 25.40 25.32 — 6.5 37.5 34.0 32.4 28.0 15 ±0.3 — 1.6
F 40 38.10 38.00 — 8 55.5 50.0 48.0 39.3 16.1 ±0.3 — 2.5
F 63 63.50 63.38 — 10 93.0 84.0 82.0 55.6 38.1 ±0.4 — 4.0
Note: r1 applies to all transition points and surfaces to the face.
Example: male square F16 GB/T 3227-2018 indicates the designation of type F male square with nominal dimension of 16 for power socket tools.
Figure 3 Type K (circlip positioning)
Table 2 Male square dimensions, type K Dimensions in millimeters
Nominal s1 d3
min d4 d5 e1 l1
max l3
max r1
max r2
max min max min max min
10 9.53 9.47 14.0 5 4.95 9.2 12.7 12.2 12.0 8.5 1.5 1.25
12.5 12.70 12.63 18.5 7.55 7.5 12.3 16.9 16.3 16.5 13 1.5 1.25
16 15.88 15.81 23.5 11.0 10.9 15.5 21.2 20.4 17.3 13.3 2.5 1.25
20 19.05 18.97 28.0 13.0 12.9 18.7 25.4 24.4 24.0 19.5 3.0 1.75
25 25.4 25.32 37.5 20.0 19.8 25.0 34.0 32.4 29.0 23.5 4.0 2.25
Example: male square K16 GB/T 3227-2018 indicates designation of type K male square with nominal dimension of 16 for power socket tools.
3.2 The types of female square are shown in Figures 4, 5, 6 and 7, and the dimensions are shown in Tables 3 and 4. The nominal dimensions and limit dimensions in column s2 in Tables 3 and 4 shall comply with the requirements of GB/T 321-2005 and grade IT11 in GB/T 1800.1-2009.
Contents of GB/T 3227-2018
Foreword i
1 Scope
2 Normative references
3 Types and dimensions of driving squares
Annex A (Informative) Comparison of this standard and ISO 1174-2:1996 in terms of clause numbers
Annex B (Informative) Technical differences between this standard and ISO 1174-2:1996 and the reasons
