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   You are in: HOME > Technical Information > Acceptance Inspection and Quanlity Assurance > ISO 3269:2000(E) Fasteners-acceptance inspection
 
Table 1 - Dimensional characteristics of threaded fasteners

Dimensional chracteristics

Product group

1 Bolts, Screws and studs of grades A and B
2 Bolts, Screws
and studs of
grades C

3 Nuts of
grades A and B

4 Nuts of
grade C

5 Self-tapping acrews and wood screws

6 all thread forming screws not covered in colum 5, self drilling screws and chip-board screws

AQL

Width across flats

1

1.5

1

1.5

1.5
1

Width across conners

1

1.5

1

1.5

1.5
1

Nut height

-

-

1

1.5

-
-

Width of slot

-

-

-

-

1.5
1

Depth of slot

1

-

-

-

1.5
1

Recess penetration

1

-

-

-

1.5
1

Socket, Go gauge

1

-

-

-

-
-

Socket, No Go gauge

1

-

-

-

-
-

Configuration under head

1

-

-

-

-
1

Go thread gauge

1

1.5

1

1.5

-
1

Not Go thread gauge

1

1.5

1

1.5

-
1

Major diameter

-

-

-

-

2.5
1

Geometric tolerances

1

1.5

1

1.5

2.5
1

All others

1.5

2.5

1.5

2.5

2.5
1.5

Nonconforming fasters

2.5

4

2.5

4

4
2.5
 
Table 2 - Dimensional chracteristics of plain washers
Dimensional
Product grade A
Product grade C
chracteristics
AQL
Hole diameter
1
1.5
Outside diameter
1.5
2.5
Others
2.5
4
 

Table 3 - Dimensional characteristics of pins

Dimensional chracteristics
Product group
Parallel
Taper pins
Clevis pins
Spring pins
Split pins
AQL
Pin diameter
1
1
1
1
1
Surface roughness
1
1
1
-
-
Taper
-
1
-
-
-
Others
2.5
2.5
2.5
2.5
2.5
 
Table 4 - Dimensional cheracteristics of blind rivets

Dimensional

AQL

chracteristics

Shank diameter

1.5

Shank length

1.5

Head diameter

1.5

Mandrel portrusion

1.5

Others

2.5
 
Table 5 - Examples of sampling plans
Ac
AQL
0.65
1.0
1.5
2.5
4.0
n
LQ10
0
8
25
5
37
3
54
    
1
50
7.6
32
12
20
18
13
27
8
42
2
125
4.3
80
6.5
50
10
32
17
20
25
3
200
3.3
125
5.4
100
6.6
50
13
32
20
4
315
2.6
200
3.9
125
6.2
80
9.6
50
15
5
400
2.4
250
3.7
160
5.8
100
9.3
-
-
6
    
200
5.2
125
8.4
80
13
7
    
250
4.7
160
7.3
100
11.5
8
    
315
4.2
200
6.6
125
10
10
    
400
3.9
250
6
160
9.5
12
      
315
5.6
200
8.8
14
      
400
5
250
8
18
        
315
7.8
22
        
400
7.3
 
NOTE:　For all sampling plans the supplier's risk is less than or equal to 5 %
n　Sample size,number of fasteners in a sample
AQL:　Quality level in a sampling plan corresponding to a high probability of acceptance, in this international
AQL:　Standard, the probability is greater than or equal to 95 %.
LQ:　Quality level in a sampling plan corresponding to a low probability of acceptance, in this international
LQ:　Standard, the probability is greater than or equal to 10 %.
LQ10　is the percentage of fasteners that do not conform in respect of product characteristic. Having
LQ10　one chance in ten of being accepted under the sampling plan, offen refered to as the consumer's risk.
 
Table 6 - Characteristics of threaded fasteners, excepting dimensional chracteristics

Chracteristics

AQL

Mechanical characteristics

Non-dstructive tests

0.65

and surface integrity

Destructive tests

1.5

Chemical composition

1.5

Metallurgical characteristics

1.5

Functional ( performance) characteristics

1.5

Coating

1.5

Others

1.5
 
Table 7 - Mechanical characteristics of plain washers
Mechanical
characteristics
Carbon or alloy steel
stainless steel
Non-Ferrous metal
AQL
Hardness
0.65
  
0.65
-
 
Table 8 - Mechanical characteristics of pin
Mechanical
characteristics

Product group

Parallei, taper and clivis pins
Spring pins, Grooved pins
AQL
Sheer strength
-
1.5
Hardness
0.65
0.65
 
Table 9 - Mechanical characteristics of b lind rivets
Mechanical characteristics
AQL
Ultimate tensile strength
1.5
Ultimate shear strength
1.5
Mandrel break load
1.5
Mandrel push -out resistance
4.0
Mandrel head retention capability
4.0
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