Our standard metric size Hex Flange Nuts are Property Class 10 equivalent and are compatible with standard 4g6g, 6g, and MJ class of fit bolts. Our standard fractional size Hex Flange Nuts are SAE Grade 8 equivalent and designed to mate with standard 2A, 3A, and UNJ class of fit bolts.

Features Spiralock’s proprietary wedge ramp female thread and unique self-locking thread technology which adds a locking feature to tapped holes. This feature prevents vibration loosening while still allowing standard external threaded parts to spin freely during assembly.

The standard plating is clear zinc chromate. Other nut styles, platings, and materials are available upon request.

Spiralock nuts conform dimensionally to IFI standards. 

Fast Facts:

  • Stainless Steel provides exceptional corrosion resistance.
  • Features the Spiralock proprietary wedge ramp female thread.
  • Offers improved integrity and reliability of threaded joints.
  • Self-locking thread technology eliminates need for other locking devices.
  • Available in a wide range of metric sizes.
  • Available in a wide range of fractional sizes.
  • Available in standard and made-to-order styles.

Metric Sizes

Nominal Nut Size EDP # A
Flange Dia.
B
Across Flats
C
Across Corners
D
Nut Thickness
E
Minimum Flange Edge Thickness
M5 x 0.8 M05080M Max. Min. 11.81 7.77
8.00
8.79
9.25
4.70
5.00
0.99
M6 x 1.0 M06100M Max. Min. 14.20 10.00 9.78 11.55
11.05
6.00
5.70
1.10
M8 x 1.00 M08100M Max. Min. 17.90 13.00 12.73 15.01
14.38
8.00
7.60
1.20
M8 x 1.25 M08125M
M10 x 1.25 M10125M Max. Min. 21.80 15.00 14.73 17.32
16.64
10.00
9.60
1.50
M10 x 1.50 M10150M
M12 x 1.25 M12125M Max. Min. 26.00 18.00 17.73 20.78
20.03
12.00
11.60
1.80
M12 x 1.75 M12175M
M14 x 1.25 M14125M Max. Min. 29.90 21.00 20.67 24.25
23.35
14.00
13.30
2.10
M14 x 1.50 M14150M
M14 x 2.00 M14200M
M16 x 1.50 M16150M Max. Min. 34.50 24.00 23.67 27.71
26.75
16.00
15.30
2.40
M16 x 2.00 M16200M
M20 x 1.50 M20150M Max. Min. 42.80 30.00 29.16 34.64
32.95
20.00
18.90
3.00
M20 x 2.50 M20250M
M24 x 2.00 M24200M Max. Min. 51.73 36.00 34.80 41.57
39.67
24.00
22.86
3.60
M24 x 3.00 M24300M

Fractional Sizes

Nominal Nut Size EDP # A
Flange Dia.
B
Across Flats
C
Across Corners
D
Nut Thickness
E
Minimum Flange Edge Thickness
1/4 - 20 F04200M Max. Min. 0.594 0.574 0.438 0.428 0.505
0.488
0.236
0.222
0.040
1/4 - 28 F04280M
5/16 - 18 F05180M Max. Min. 0.680 0.660 0.500 0.489 0.577
0.557
0.283
0.268
0.040
5/16 – 24 F05240M
3/8 – 16 F06160M Max. Min. 0.750 0.728 0.562 0.551 0.650
0.628
0.347
0.330
0.040
3/8 – 24 F06240M
7/16 – 14 F07140M Max. Min. 0.937 0.910 0.688 0.675 0.794
0.768
0.395
0.375
0.040
7/16 – 20 F07200M
1/2 - 13 F08130M Max. Min. 1.031 1.000 0.750 0.736 0.866
0.840
0.458
0.437
0.050
1/2 - 20 F08200M
9/16 – 12 F09120M Max. Min. 1.188 1.155 0.875 0.861 1.010
0.982
0.506
0.483
0.050
9/16 –18 F09180M
5/8 – 11 F10110M Max. Min. 1.281 1.248 0.938 0.922 1.083
1.051
0.569
0.545
0.050
5/8 – 18 F10180M
3/4 - 10 F12100M Max. Min. 1.500 1.460 1.125 1.088 1.299
1.240
0.675
0.627
0.060
3/4 - 16 F12160M
7/8 – 9 F14090M Max. Min. 1.750 1.706 1.312 1.269 1.515
1.446
0.788
0.735
0.070
7/8 – 14 F14140M
1 – 8 F16080M Max. Min. 2.000 1.950 1.500 1.450 1.732
1.653
0.900
0.850
0.080
1 – 12 F16120M

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The availability of the products described on this site, and the product descriptions, may vary from country to country. Consult your STANLEY Engineered Fastening Account Executive or your local distributor for specific product information.