Hardlock

Dimensions - Hard Lock Nuts PDF Print E-mail

Dimensions and Specifications for Hard Lock Nuts

Hard Lock Nut Standard Dimensions (inch)

d
s
e
m & m1
L

Unit Weight
Normal Size or Basic Major Dia. of Thread
Width Across Flats
Width Across Corners
Thickness Hex Nuts
Overall Height
Basic
 Max.
Min.
Max.
Min.
Basic
 Max.
Min.
Approx.
Approx.
UNC 1/4
0.2500
7/16
 0.438
0.428
0.505
0.488
 7/32 0.226
0.212
0.370
3.3
UNC 5/16
0.3125
1/2
 0.500
 0.489
0.577
0.557
 17/64 0.273
0.258
0.433
7.9
UNC 3/8
 0.3750
9/16
 0.562
0.551
0.650
0.628
21/64
 0.337
0.320
 0.535
17.6
UNC 7/16
0.4375
11/16
 0.688
0.675
0.794
0.768
3/8
 0.385
0.365
0.610
20.8
UNC 1/2
0.5000
3/4
 0.750
0.736
0.866
0.840
7/16
 0.448
0.427
0.724
28.1
UNC 5/8
0.6250
15/16
 0.938
 0.922
1.083
1.051
35/64
 0.559
0.515
0.937
52.8
UNC 3/4
0.7500
1-1/8
 1.125
1.088
1.299
1.240
41/64
 0.665
0.597
1.106
105.0
UNC 7/8
0.8750
1-5/16
 1.312
1.269
1.516
1.447
3/4
 0.776
0.704
1.307
130.0
UNC 1
1.0000
1-1/2
 1.500
 1.450
1.732
1.653
55/64
 0.887
0.811
 1.500
246

 

Tightening Torque

Size

Concave Nut
UNC 1/4
4 - 5 N•m
UNC 5/16
9 -13 N•m
UNC 3/8
18 - 24 N•m
UNC 7/16
27 - 39 N•m
UNC 1/2
40 - 58 N•m
UNC 5/8
70 - 100 N•m
UNC 3/4
120 - 150 N•m
UNC 7/8
150 - 250 N•m
UNC 1
250 - 390 N•m


metric

Hard Lock Nut Standard Dimensions (mm)


S
H (lower nut)
H1 (upper nut)
B (width)
C
ℓ (total height)
h
Set/
Weight
Margin
Coarse
Fine
Std. Dimen.
Toler-ance
Std. Dimen.
Toler-ance
Std. Dimen.
Toler-ance
Approx
Approx
Approx
g
M6
1.0
-
5
0
-0.48
5
0
-0.48
10
0
-0.6
11.5
8.3
3.3
3.3
M8
1.25
1.0
6.5
0
-0.58
6.5
0
-0.58
13
0
-0.7
15
11
4.5
8.6
M10
1.5
1.25
8
//
8
//
17
//
19.6
13.5
5.5
17.6
M12
1.75
1.5
10
//
10
//
19
0
-0.8
21.9
17
7.0
27.3
M14
2.0
1.5
11
0
-0.7
11
0
-0.7
22
//
25.4
18.5
7.5
39
M16
2.0
1.5
13
//
13
//
24
//
27.7
22.5
9.5
52.8
M18
2.5
1.5
15
//
15
//
27
//
31.2
25.5
10.5
80
M20
2.5
1.5
16
//
16
//
30
//
34.6
27.5
11.5
105
M22
2.5
1.5
18
//
18
//
32
0
-1.0
37
31.5
13.5
130
M24
3.0
2.0
19
0
-0.84
19
0
-0.84
36
//
41.6
33
14
180
M27
3.0
2.0
22
0
-1.84
22
0
-1.84
41
//
47.3
38
16
246
M30
3.5
2.0
24
0
-1.84
24
0
-1.84
46
//
53.1
42
18
375
M33
3.5
2.0
26
0
-1.84
26
0
-1.84
50
//
57.7
46
20
480
M36
4.0
3.0
29
0
-1.84
29
0
-1.84
55
0
-1.2
63.5
50
21
630
M39
4.0
3.0
31
0
-2.0
31
0
-2.0
60
&
69.3
54
23
935
M42
4.5
4.0
34
0
-2.0
34
0
-2.0
65
//
75
59
25
1080
M45
4.5
4.0
36
0
-2.0
36
0
-2.0
70
//
80.8
63
27
1330
M48
5.0
4.0
38
0
-2.0
38
0
-2.0
75
//
86.5
67
29
1595
M52
5.0
4.0
42
0
-2.0
42
0
-2.0
80
//
92.4
75
33
2055
M56
5.5
4.0
45
0
-2.0
45
0
-2.0
85
0
-1.4
98.1
79
34
2410
M64
6.0
4.0
51
0
-2.2
51
0
-2.2
95
//
110
89
38
3172

 

Lower nut (tightening nut)
Upper nut
(locking nut)
Material classification: Tightening torque
standard reference value list (Unit: Nm)
Materials are uniform
Class4 (SS400 or equivalent)
Class8 (S45C or equivalent)
Class10 (SCM435 or equivalent)
A2,A4
(SUS304, 306 or equivalent)
Tightening torque (Unit Nm)
4.8（320N／m㎡
8.8（640N／m㎡）
10.9（900N／m㎡）
50（210N／m㎡）
70（450N／m㎡）
2.3～6
-
-
1.5～4
3.3～9
4～5
5.6～15
11.2～30
15.8～42
3.7～10
7.9～21
9～13
11～30
22～59
31～84
7～20
16～42
18～24
19～52
39～104
55～146
13～34
27～73
27～39
31～82
62～165
87～232
20～54
44～116
40～58
48～129
97～257
136～362
32～84
68～181
70～100
66～177
133～354
187～498
44～116
93～249
100～150
94～251
188～502
265～706
62～165
132～353
120～200
128～341
256～683
360～960
84～224
180～480
150～250
163～434
325～868
458～1220
107～285
229～610
160～300
238～635
458～1269
669～1785
156～416
335～892
250～390
323～862
646～1723
909～2424
212～566
454～1212
270～440
440～1173
879～2345
1237～3298
289～770
618～1649
290～490
565～1506
1129～3012
1588～4235
371～988
794～2118
340～590
731～1949
1462～3898
2056～5481
480～1279
1028～2741
390～640
904～2411
1808～4821
2542～6780
593～1582
1271～3390
440～690
1128～3309
2257～6018
3174～8463
741～1975
1587～4231
490～740
1358～3620
2715～7240
3818～10181
891～2376
1909～5091
540～780
1755～4681
3510～9361
4937～13164
1152～3072
2468～6582
590～830
2183～5820
4365～11641
6139～16370
1432～3820
3069～8185
640～880
3288～8769
6577～17537
9248～24662
2158～5755
4624～12331
690～930

The tightening torque value is uniform in both the semi-thin and thin types regardless of the material used. 
*The screw standard is based on JIS B0205 and JIS B0207, and the nut standard is based on JIS B1181

At least M8 for hot dipped zinc plating.

The minimum preload of the above-mentioned lower nuts are 60% of the bolt’s yield tensile strength, given the torque constant of 0.1. The maximum preload cannot exceed 80% of the bolt’s yield tensile strength with a given torque constant of 0.2.

The torque constant is 0.1 when oil is applied to the nuts and bolts, and when oil is not applied, the torque constant is 0.2.

Materials equivalent to SS400:
SWRM – mild steel wire rods, SWRH – hard steel wire rods, SWRCH – cold heading steel wire rod, SWCH – cold heading steel wire [NOTE: These are the same as above]

torque axial force simplified calculation formula
T=K×d×Ff
T:tightening torque
Ff:axial force
K:torque coefficient
d:nominal screw diameter

 

Thin Type Dimensions

S
H (lower nut)
H1 (upper nut)
B (width)
C
ℓ (total height)
h

Uper nut tight. torque SS400
(Nm)
Margin
Coarse
Std. Dimen.
Tolerance
Std. Dimen.
Tolerance
Std. Dimen.
Tolerance
Approx
Approx
Approx
M16
2.0
10
0
-0.58
10
0
-0.58
24
0 -0.8
27.7
16.5
6.5
70～100
M18
2.5
11
0
-0.7
11
0
-0.7
27
//
31.2
17.5
6.2
100～150
M20
2.5
12
//
12
//
30
//
34.6
19.5
7.5
120～200
M22
2.5
13
//
13
//
32
0
-1.0
37
21.5
8.5
150～250
M24
3.0
14
//
14
//
36
//
41.6
23
9.0
160～300
M27
3.0
16
//
16
//
41
//
47.3
26
10
250～390
M30
3.5
18
//
18
//
46
//
53.1
30
12
270～440
M33
3.5
20
0
-0.84
20
0
-0.84
50
//
57.7
34
13
290～490
M36
4.0
21
//
21
//
55
0
-1.2
63.5
34
13
340～590
M39
4.0
23
//
23
//
60
//
69.3
38
14
390～640
M42
4.5
25
//
25
//
65
//
75
40
15
440～690
M45
4.5
27
//
27
//
70
//
80.8
45
18
490～740
M48
5.0
29
//
29
//
75
//
86.5
49
20
540～780
M52
5.0
31
0
-1.0
31
0
-1.0
80
//
92.4
53
22
590～830
M56
5.5
34
//
34
//
85
0
-1.4
98.1
57
23
640～880
M64
6.0
38
//
38
//
95
//
110
63
25
690～930

*This product's lower nut tightening torque is approx. 60 ~ 80% of that of the «H-1» lower nut.

 

Semi Thin Type Dimensions

S
H (lower nut)
H1 (upper nut)
B (width)
C
ℓ (total height)
h

Uper nut tight. torque SS400
(Nm)
Margin
Coarse
Std. Dimen.
Tolerance
Std. Dimen.
Tolerance
Std. Dimen.
Tolerance
Approx
Approx
Approx
M16
2.0
13
0
-0.7
10
0
-0.58
24
0 -0.8
27.7
19.5
9.5
70～100
M18
2.5
15
0
-0.7
11
0
-0.7
27
//
31.2
21.5
10.5
100～150
M20
2.5
16
//
12
//
30
//
34.6
23.5
11.5
120～200
M22
2.5
18
//
13
//
32
0
-1.0
37
26.5
13.5
150～250
M24
3.0
19
0
-0.84
14
//
36
//
41.6
28
14
160～300
M27
3.0
22
//
16
//
41
//
47.3
32
16
250～390
M30
3.5
24
//
18
//
46
//
53.1
36
18
270～440
M33
3.5
26
//
20
0
-0.84
50
//
57.7
40
20
290～490
M36
4.0
29
//
21
//
55
0
-1.2
63.5
46
21
340～590
M39
4.0
31
0
-1.0
23
//
60
//
69.3
46
23
390～640
M42
4.5
34
//
25
//
65
//
75
50
25
440～690
M45
4.5
36
//
27
//
70
//
80.8
54
27
490～740
M48
5.0
38
//
29
//
75
//
86.5
58
29
540～780
M52
5.0
42
//
31
0
-1.0
80
//
92.4
64
33
590～830
M56
5.5
45
//
34
//
85
0
-1.4
98.1
68
34
640～880
M64
6.0
51
0
-1.2
38
//
95
//
110
78
38
690～930

*This product's lower nut tightening torque is the same as that of the«H-1» lower nut.
 

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