Grade 8 nuts are the hex nuts with heat treatment. The grade 8 nuts are six-sided general purpose fasteners with internal screw threads. For similar reasons as the bolt head – 6 sides give a good granularity of angles for a tool to approach from (good in tight spots), but more (and smaller) corners would be vulnerable to being rounded off. It takes only 1/6th of a rotation to obtain the next side of the hexagon and grip is optimal. However, polygons with more than 6 sides do not give the requisite grip and polygons with fewer than 6 sides take more time to be given a complete rotation. Other specialized shapes exist for certain needs, such as wingnuts for finger adjustment and captive nuts (e.g. cage nuts) for inaccessible areas. Ever Hardware provides custom-made fasteners and customizable packaging.

  • Metric size of grade 8 nuts
Hole Diameter D(mm) Pitch P(mm) Across Flats A/F(mm) External Diameter;across corners, A/C(mm) Height, H(mm)
2nd Coarse Fine ISO DIN JIS Hex nut Jam nut Nylon nut
1st choice
choice
1 0.25 2.5
1.2 0.25
1.4 0.3
1.6 0.35 3.2
1.8 0.35
2 0.4 4 1.6 1.2
2.5 0.45 5 2 1.6
3 0.5 5.5 6.4 2.4 1.8 4
3.5 0.6 6
4 0.7 7 7 7 8.1 3.2 2.2 5
5 0.8 8 8 8 9.2 4 2.7 5
6 1 0.75 10 10 10 11.5 5 3.2 6
7 1 11 5.5 3.5
8 1.25 1 13 13 12 15 6.5 4 8
10 1.5 1.25 or 1 16 17 14 19.6 8 5 10
12 1.75 1.5 or 1.25 18 19 17 22.1 10 6 12
14 2 1.5 21 22 19 11 7 14
16 2 1.5 24 24 22 27.7 13 8 16
18 2.5 2 or 1.5 27 15 9 18.5
20 2.5 2 or 1.5 30 30 34.6 16 10 20
22 2.5 2 or 1.5 32
24 3 2 36 41.6 19
27 3 2 41
30 3.5 2 46 53.1 24
33 3.5 2
36 4 3 55 63.5 29
39 4 3
42 4.5 3
45 4.5 3
48 5 3
52 5 4
56 5.5 4
  • Inch size of grade 8 nuts
UTS Nominal hole Pitch, P Across flats, Across corners, Height, H
size diameter, D Coarse (UNC) Fine (UNF) Extra fine (UNEF) A/F A/C Hex nut Jam nut Nylon nut
(in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm)
#0 532 0.1563 3.969
#1 532 0.1563 3.969
#2 0.086 2.1844 316 0.1875 4.763 5.18 1.65
#3 316 0.1875 4.763 5.1 1.85
#4 0.112 2.8448 14 0.25 6.35 7.05 2.25
#6 0.138 3.5052 516 0.3125 7.938 8.95 2.85
#8 0.164 4.1656 1132 0.344 8.731 0.386 9.8 3.05
#10 0.19 4.826 38 0.375 9.525 0.461 11.7 3.1
#12 0.216 5.4864 716 0.4375 11.113
14 14 0.25 6.35 716 0.4375 11.113
516 516 0.3125 7.9375 12 0.5 12.7 0.577
38 38 0.375 9.525 916 0.562 14.288 0.65
716 716 1116 0.675 17.463
12 12 0.5 12.7 34 0.75 19.05 0.866
916 916 78 0.875 22.225
58 58 1516 0.9375 23.813 1.083
34 34 0.75 18 1.125 28.575 1.299
78 78 516 1.3125 33.338
1 1 1 25.4 12 1.5 38.1 1.653

Ever Hardware makes the world a better place

Category Grade 8 Nuts
Finish Electro-Plating
Thread type Metric/Imperial/According to Request
Material Stainless Steel/Carbon Steel/Aluminum/Brass/Copper, etc.
Brand Ever Hardware
Place of origin China Mainland
Size Customized as required
Grade 8 nuts alloy steel zinc plated metric coarse full nuts hot dipped galvanized

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What Client’s Say

Those look great! All the specs look perfect.
Kent De Mond
Perfect ! This is that I need.
Hernán Balboa
Thank you very much.
The bolts are perfect and they’re fits good.
Ashley
The nut fits perfect on our M2.5 screw part.
Height is also ok.
Mirjam
I tested the bolts this morning and they are perfect. Thank you so much.
Bill McDonald

We are professional on precision grade 8 nuts and custom-made fasteners services!

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