DIN931 Bolts Hexagon Bolts China High Quality Origin Bolts Supplier

DIN931 Blots Introduction

DIN931 bolts, also known as outer hexagon bolts. It is a fastener composed of two parts, a hexagonal head and a threaded screw, and is generally used in conjunction with a nut.

DIN931 bolts are commonly used products in fasteners, and are widely used in the production, installation and maintenance of mechanical equipment, electronic products, communication equipment, furniture equipment, construction and other industries.

We are origin supplier of DIN931 Bolts from China.We provide customers with products that meet requirements. While guaranteeing the quality, we provide customers with competitively priced products. Our vision is to become your most reliable partner in China.

Three oxidized black, half-threaded DIN931 Bolts

DIN931 Bolts Details

SIZE: M5-M56

MATEAIL: Carbon Steel, Stainless steel

STANDARD: DIN931, ISO4014

GRADE: 4.8, 8.8, 10.9, 12.9, A2-70

SURFACE TREATMENT: ZP, HDG, BLACK, Dacromet

CUSTOMIZED SUPPORT: YES

DIN931 Bolts Specifications （DIN931-1-1987）

    Thread Size
d
    M1.6

    M2
    M2.5
    M3
    (M3.5)
    M4
    M5
    M6
    (M7)
    M8
    M10
    M12
  


    P
    Thread Pitch
    　
    0.35
    0.4
    0.45
    0.5
    0.6
    0.7
    0.8
    1
    1
    1.25
    1.5
    1.75
  

    b
    

Ref.
    L≤125
    9
    10
    11
    12
    13
    14
    16
    18
    20
    22
    26
    30
  

    125＜L≤200
    -
    -
    -
    -
    -
    -
    22
    24
    26
    28
    32
    36
  

    L＞200
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    45
    49
  

    c
    min
    　
    0.1
    0.1
    0.1
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
  

    max
    　
    0.25
    0.25
    0.25
    0.4
    0.4
    0.4
    0.5
    0.5
    0.5
    0.6
    0.6
    0.6
  

    da
    max
    　
    2
    2.6
    3.1
    3.6
    4.1
    4.7
    5.7
    6.8
    7.8
    9.2
    11.2
    13.7
  

    ds
    max=nominal size
    　
    1.6
    2
    2.5
    3
    3.5
    4
    5
    6
    7
    8
    10
    12
  

    
min
    Grade A
    1.46
    1.86
    2.36
    2.86
    3.32
    3.82
    4.82
    5.82
    6.78
    7.78
    9.78
    11.73
  

    Grade B
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    dw
    
min
    Grade A
    2.4
    3.2
    4.1
    4.6
    5.1
    5.9
    6.9
    8.9
    9.8
    11.6
    15.6
    17.4
  

    Grade B
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    e
    
min
    Grade A
    3.41
    4.32
    5.45
    6.01
    6.58
    7.66
    8.79
    11.05
    12.12
    14.38
    18.9
    21.1
  

    Grade B
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    k
    Nominal Size
    　
    1.1
    1.4
    1.7
    2
    2.4
    2.8
    3.5
    4
    4.8
    5.3
    6.4
    7.5
  

    
Grade A
    min
    0.98
    1.28
    1.58
    1.88
    2.28
    2.68
    3.35
    3.85
    4.65
    5.15
    6.22
    7.32
  

    max
    1.22
    1.52
    1.82
    2.12
    2.52
    2.92
    3.65
    4.15
    4.95
    5.45
    6.58
    7.68
  

    
Grade B
    min
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    max
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    k1
    min
    　
    0.7
    0.9
    1.1
    1.3
    1.6
    1.9
    2.28
    2.63
    3.19
    3.54
    4.28
    5.05
  

    r
    min
    　
    0.1
    0.1
    0.1
    0.1
    0.1
    0.2
    0.2
    0.25
    0.25
    0.4
    0.4
    0.6
  

    s
    max=nominal size
    　
    3.2
    4
    5
    5.5
    6
    7
    8
    10
    11
    13
    17
    19
  

    
min
    Grade A
    3.02
    3.82
    4.82
    5.32
    5.82
    6.78
    7.78
    9.78
    10.73
    12.73
    16.73
    18.67
  

    Grade B
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    
  

      Thread Size
d
    (M14)
    M16
    (M18)
    M20
    (M22)
    M24
    (M27)
    M30
    (M33)
    M36
    (M39)
    　
  

    P
    Thread Pitch
    　
    2
    2
    2.5
    2.5
    2.5
    3
    3
    3.5
    3.5
    4
    4
    　
  

    b
    

Ref.

    L≤125
    34
    38
    42
    46
    50
    54
    60
    66
    72
    78
    84
    　
  

    125＜L≤200
    40
    44
    48
    52
    56
    60
    66
    72
    78
    84
    90
    　
  

    L＞200
    53
    57
    61
    65
    69
    73
    79
    85
    91
    97
    103
    　
  

    c
    min
    　
    0.15
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.3
    　
  

    max
    　
    0.6
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    1
    　
  

    da
    max
    　
    15.7
    17.7
    20.2
    22.4
    24.4
    26.4
    30.4
    33.4
    36.4
    39.4
    42.4
    　
  

    ds
    max=nominal size
    　
    14
    16
    18
    20
    22
    24
    27
    30
    33
    36
    39
    　
  

    
min
    Grade A
    13.73
    15.73
    17.73
    19.67
    21.67
    23.67
    -
    -
    -
    -
    -
    　
  

    Grade B
    -
    15.57
    17.57
    19.48
    21.48
    23.48
    26.48
    29.48
    32.38
    35.38
    38.38
    　
  

    dw
    
min
    Grade A
    20.5
    22.5
    25.3
    28.2
    30
    33.6
    -
    -
    -
    -
    -
    　
  

    Grade B
    -
    22
    24.8
    27.7
    29.5
    33.2
    38
    42.7
    46.6
    51.1
    55.9
    　
  

    e
    
min
    Grade A
    24.49
    26.75
    30.14
    33.53
    35.72
    39.98
    -
    -
    -
    -
    -
    　
  

    Grade B
    -
    26.17
    29.56
    32.95
    35.03
    39.55
    45.2
    50.85
    55.37
    60.79
    66.44
    　
  

    k
    Nominal Size
    　
    8.8
    10
    11.5
    12.5
    14
    15
    17
    18.7
    21
    22.5
    25
    　
  

    
Grade A
    min
    8.62
    9.82
    11.28
    12.28
    13.78
    14.78
    -
    -
    -
    -
    -
    　
  

    max
    8.98
    10.18
    11.72
    12.72
    14.22
    15.22
    -
    -
    -
    -
    -
    　
  

    
Grade B
    min
    -
    9.71
    11.15
    12.15
    13.65
    14.65
    16.65
    18.28
    20.58
    22.08
    24.58
    　
  

    max
    -
    10.29
    11.85
    12.85
    14.35
    15.35
    17.35
    19.12
    21.42
    22.92
    25.42
    　
  

    k1
    min
    　
    5.96
    6.8
    7.8
    8.5
    9.6
    10.3
    11.7
    12.8
    14.4
    15.5
    17.2
    　
  

    r
    min
    　
    0.6
    0.6
    0.6
    0.8
    0.8
    0.8
    1
    1
    1
    1
    1
    　
  

    s
    max=nominal size
    　
    22
    24
    27
    30
    32
    36
    41
    46
    50
    55
    60
    　
  

    
min
    Grade A
    21.67
    23.67
    26.67
    29.67
    31.61
    35.38
    -
    -
    -
    -
    -
    　
  

    Grade B
    -
    23.16
    26.16
    29.16
    31
    35
    40
    45
    49
    53.8
    58.8
    　
  

Thread Size d	M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12
P	Thread Pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75
b	Ref.	L≤125	9	10	11	12	13	14	16	18	20	22	26	30
125＜L≤200	-	-	-	-	-	-	22	24	26	28	32	36
L＞200	-	-	-	-	-	-	-	-	-	-	45	49
c	min		0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
max		0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.5	0.6	0.6	0.6
da	max		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7
ds	max=nominal size		1.6	2	2.5	3	3.5	4	5	6	7	8	10	12
min	Grade A	1.46	1.86	2.36	2.86	3.32	3.82	4.82	5.82	6.78	7.78	9.78	11.73
Grade B	-	-	-	-	-	-	-	-	-	-	-	-
dw	min	Grade A	2.4	3.2	4.1	4.6	5.1	5.9	6.9	8.9	9.8	11.6	15.6	17.4
Grade B	-	-	-	-	-	-	-	-	-	-	-	-
e	min	Grade A	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12	14.38	18.9	21.1
Grade B	-	-	-	-	-	-	-	-	-	-	-	-
k	Nominal Size		1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8	5.3	6.4	7.5
Grade A	min	0.98	1.28	1.58	1.88	2.28	2.68	3.35	3.85	4.65	5.15	6.22	7.32
max	1.22	1.52	1.82	2.12	2.52	2.92	3.65	4.15	4.95	5.45	6.58	7.68
Grade B	min	-	-	-	-	-	-	-	-	-	-	-	-
max	-	-	-	-	-	-	-	-	-	-	-	-
k1	min		0.7	0.9	1.1	1.3	1.6	1.9	2.28	2.63	3.19	3.54	4.28	5.05
r	min		0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25	0.4	0.4	0.6
s	max=nominal size		3.2	4	5	5.5	6	7	8	10	11	13	17	19
min	Grade A	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73	12.73	16.73	18.67
Grade B	-	-	-	-	-	-	-	-	-	-	-	-

Thread Size d	(M14)	M16	(M18)	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)
P	Thread Pitch		2	2	2.5	2.5	2.5	3	3	3.5	3.5	4	4
b	Ref.	L≤125	34	38	42	46	50	54	60	66	72	78	84
125＜L≤200	40	44	48	52	56	60	66	72	78	84	90
L＞200	53	57	61	65	69	73	79	85	91	97	103
c	min		0.15	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3
max		0.6	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1
da	max		15.7	17.7	20.2	22.4	24.4	26.4	30.4	33.4	36.4	39.4	42.4
ds	max=nominal size		14	16	18	20	22	24	27	30	33	36	39
min	Grade A	13.73	15.73	17.73	19.67	21.67	23.67	-	-	-	-	-
Grade B	-	15.57	17.57	19.48	21.48	23.48	26.48	29.48	32.38	35.38	38.38
dw	min	Grade A	20.5	22.5	25.3	28.2	30	33.6	-	-	-	-	-
Grade B	-	22	24.8	27.7	29.5	33.2	38	42.7	46.6	51.1	55.9
e	min	Grade A	24.49	26.75	30.14	33.53	35.72	39.98	-	-	-	-	-
Grade B	-	26.17	29.56	32.95	35.03	39.55	45.2	50.85	55.37	60.79	66.44
k	Nominal Size		8.8	10	11.5	12.5	14	15	17	18.7	21	22.5	25
Grade A	min	8.62	9.82	11.28	12.28	13.78	14.78	-	-	-	-	-
max	8.98	10.18	11.72	12.72	14.22	15.22	-	-	-	-	-
Grade B	min	-	9.71	11.15	12.15	13.65	14.65	16.65	18.28	20.58	22.08	24.58
max	-	10.29	11.85	12.85	14.35	15.35	17.35	19.12	21.42	22.92	25.42
k1	min		5.96	6.8	7.8	8.5	9.6	10.3	11.7	12.8	14.4	15.5	17.2
r	min		0.6	0.6	0.6	0.8	0.8	0.8	1	1	1	1	1
s	max=nominal size		22	24	27	30	32	36	41	46	50	55	60
min	Grade A	21.67	23.67	26.67	29.67	31.61	35.38	-	-	-	-	-
Grade B	-	23.16	26.16	29.16	31	35	40	45	49	53.8	58.8

DIN931 Bolts Specifications （DIN931-2-1987）

    Screw Thread
d
    M42
    (M45)
    M48
    (M52)
    M56
    (M60)
    M64
    (M68)
    M72
  


    P
    Pitch
    4.5
    4.5
    5
    5
    5.5
    5.5
    6
    6
    6
  

    b
    L≤125
    90
    96
    102
    -
    -
    -
    -
    -
    -
  

    125＜L≤200
    96
    102
    108
    116
    124
    132
    140
    148
    156
  

    L＞200
    109
    115
    121
    129
    137
    145
    153
    161
    169
  

    c
    min
    0.3
    0.3
    0.3
    0.3
    -
    -
    -
    -
    -
  

    max
    1
    1
    1
    1
    1
    1
    1
    1
    1
  

    da
    max
    45.6
    48.6
    52.6
    56.6
    63
    67
    71
    75
    79
  

    ds
    max=nominal size
    42
    45
    48
    52
    56
    60
    64
    68
    72
  

    min
    41.61
    44.38
    47.38
    51.26
    55.26
    59.26
    63.26
    67.26
    71.26
  

    dw
    min
    60.6
    64.7
    69.4
    74.2
    78.7
    83.4
    88.2
    92.9
    97.7
  

    e
    min
    71.3
    76.95
    82.6
    88.25
    93.56
    99.21
    104.86
    110.51
    116.16
  

    k
    Nominal Size
    26
    28
    30
    33
    35
    38
    40
    43
    45
  

    max
    26.42
    28.42
    30.42
    33.5
    35.5
    38.5
    40.5
    43.5
    45.5
  

    min
    25.58
    27.58
    29.58
    32.5
    34.5
    37.5
    39.5
    42.5
    44.5
  

    k1
    min
    17.9
    19.3
    20.9
    22.8
    24.2
    26.2
    27.6
    29.8
    31.2
  

    r
    min
    1.2
    1.2
    1.6
    1.6
    2
    2
    2
    2
    2
  

    s
    max=nominal size
    65
    70
    75
    80
    85
    90
    95
    100
    105
  

    min
    63.1
    68.1
    73.1
    78.1
    82.8
    87.8
    92.8
    97.8
    102.8
  

    
    
    
    
    
    
    
    
    
    
    
  

      Screw Thread
d
    (M76)
    M80
    M90
    M100
    M110
    M125
    M140
    M160
    　
  

    P
    Pitch
    6
    6
    6
    6
    6
    6
    6
    6
    　
  

    b
    L≤125
    -
    -
    -
    -
    -
    -
    -
    -
    　
  

    125＜L≤200
    164
    172
    192
    -
    -
    -
    -
    -
    　
  

    L＞200
    177
    185
    205
    225
    245
    275
    305
    345
    　
  

    c
    min
    -
    -
    -
    -
    -
    -
    -
    -
    　
  

    max
    1
    2
    2
    2
    2
    2
    2
    2
    　
  

    da
    max
    83
    87
    97
    107
    117
    132
    147
    167
    　
  

    ds
    max=nominal size
    76
    88
    90
    100
    110
    125
    140
    160
    　
  

    min
    75.26
    79.26
    89.13
    99.13
    109.13
    124
    139
    159
    　
  

    dw
    min
    102.1
    106.9
    121.1
    135.4
    144.9
    168.6
    185.6
    214.1
    　
  

    e
    min
    121.81
    127.46
    144.08
    161.02
    172.32
    200.57
    220.8
    254.7
    　
  

    k
    Nominal Size
    48
    50
    57
    63
    69
    79
    88
    100
    　
  

    max
    48.5
    50.5
    57.6
    63.6
    69.6
    79.6
    88.7
    100.7
    　
  

    min
    47.5
    49.5
    56.4
    62.4
    68.4
    78.4
    87.3
    99.3
    　
  

    k1
    min
    33.2
    34.6
    40.3
    43.7
    47.9
    54.9
    61.1
    69.5
    　
  

    r
    min
    2
    2
    2.5
    2.5
    2.5
    2.5
    2.5
    2.5
    　
  

    s
    max=nominal size
    110
    115
    130
    145
    155
    180
    200
    230
    　
  

    min
    107.8
    112.8
    127.5
    142.5
    152.5
    177.5
    195.4
    225.4
    　
  

Screw Thread d	M42	(M45)	M48	(M52)	M56	(M60)	M64	(M68)	M72
P	Pitch	4.5	4.5	5	5	5.5	5.5	6	6	6
b	L≤125	90	96	102	-	-	-	-	-	-
125＜L≤200	96	102	108	116	124	132	140	148	156
L＞200	109	115	121	129	137	145	153	161	169
c	min	0.3	0.3	0.3	0.3	-	-	-	-	-
max	1	1	1	1	1	1	1	1	1
da	max	45.6	48.6	52.6	56.6	63	67	71	75	79
ds	max=nominal size	42	45	48	52	56	60	64	68	72
min	41.61	44.38	47.38	51.26	55.26	59.26	63.26	67.26	71.26
dw	min	60.6	64.7	69.4	74.2	78.7	83.4	88.2	92.9	97.7
e	min	71.3	76.95	82.6	88.25	93.56	99.21	104.86	110.51	116.16
k	Nominal Size	26	28	30	33	35	38	40	43	45
max	26.42	28.42	30.42	33.5	35.5	38.5	40.5	43.5	45.5
min	25.58	27.58	29.58	32.5	34.5	37.5	39.5	42.5	44.5
k1	min	17.9	19.3	20.9	22.8	24.2	26.2	27.6	29.8	31.2
r	min	1.2	1.2	1.6	1.6	2	2	2	2	2
s	max=nominal size	65	70	75	80	85	90	95	100	105
min	63.1	68.1	73.1	78.1	82.8	87.8	92.8	97.8	102.8

Screw Thread d	(M76)	M80	M90	M100	M110	M125	M140	M160
P	Pitch	6	6	6	6	6	6	6	6
b	L≤125	-	-	-	-	-	-	-	-
125＜L≤200	164	172	192	-	-	-	-	-
L＞200	177	185	205	225	245	275	305	345
c	min	-	-	-	-	-	-	-	-
max	1	2	2	2	2	2	2	2
da	max	83	87	97	107	117	132	147	167
ds	max=nominal size	76	88	90	100	110	125	140	160
min	75.26	79.26	89.13	99.13	109.13	124	139	159
dw	min	102.1	106.9	121.1	135.4	144.9	168.6	185.6	214.1
e	min	121.81	127.46	144.08	161.02	172.32	200.57	220.8	254.7
k	Nominal Size	48	50	57	63	69	79	88	100
max	48.5	50.5	57.6	63.6	69.6	79.6	88.7	100.7
min	47.5	49.5	56.4	62.4	68.4	78.4	87.3	99.3
k1	min	33.2	34.6	40.3	43.7	47.9	54.9	61.1	69.5
r	min	2	2	2.5	2.5	2.5	2.5	2.5	2.5
s	max=nominal size	110	115	130	145	155	180	200	230
min	107.8	112.8	127.5	142.5	152.5	177.5	195.4	225.4

Equivalent Standard for DIN931 Bolts- DIN EN ISO 4014

ISO 4014 Hexagon head bolts

    Thread Size
d
    M1.6
    M2
    M2.5
    M3
    (M3.5)
    M4
    M5
    M6
    (M7)
    M8
    M10
    M12
    (M14)
    M16
    (M18)
  


    P
    Pitch
    　
    0.35
    0.4
    0.45
    0.5
    0.6
    0.7
    0.8
    1
    1
    1.25
    1.5
    1.75
    2
    2
    2.5
  

    b
    L≤125
    　
    9
    10
    11
    12
    13
    14
    16
    18
    20
    22
    26
    30
    34
    38
    42
  

    125＜L≤200
    　
    15
    16
    17
    18
    19
    20
    22
    24
    26
    28
    32
    36
    40
    44
    48
  

    L＞200
    　
    28
    29
    30
    31
    32
    33
    35
    37
    39
    41
    45
    49
    53
    57
    61
  

    c
    max
    　
    0.25
    0.25
    0.25
    0.4
    0.4
    0.4
    0.5
    0.5
    0.6
    0.6
    0.6
    0.6
    0.6
    0.8
    0.8
  

    min
    　
    0.1
    0.1
    0.1
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.15
    0.2
    0.2
  

    da
    max
    　
    2
    2.6
    3.1
    3.6
    4.1
    4.7
    5.7
    6.8
    7.8
    9.2
    11.2
    13.7
    15.7
    17.7
    20.2
  

    ds
    max=nominal size
    　
    1.6
    2
    2.5
    3
    3.5
    4
    5
    6
    7
    8
    10
    12
    14
    16
    18
  

    Grade A
    min
    1.46
    1.86
    2.36
    2.86
    3.32
    3.82
    4.82
    5.82
    6.78
    7.78
    9.78
    11.73
    13.73
    15.73
    17.73
  

    Grade B
    min
    1.35
    1.75
    2.25
    2.75
    3.2
    3.7
    4.7
    5.7
    6.64
    7.64
    9.64
    11.57
    13.57
    15.57
    17.57
  

    dw
    Grade A
    min
    2.54
    3.34
    4.34
    4.84
    5.34
    6.2
    7.2
    8.88
    9.63
    11.63
    14.63
    16.63
    19.64
    22.49
    25.34
  

    Grade B
    min
    2.42
    3.22
    4.22
    4.72
    5.22
    6.06
    7.06
    8.74
    9.47
    11.47
    14.47
    16.47
    19.15
    22
    24.85
  

    e
    Grade A
    min
    3.41
    4.32
    5.45
    6.01
    6.58
    7.66
    8.79
    11.05
    12.12
    14.38
    17.77
    20.03
    23.36
    26.75
    30.14
  

    Grade B
    min
    3.28
    4.18
    5.31
    5.88
    6.44
    7.5
    8.63
    10.89
    11.94
    14.2
    17.59
    19.85
    22.78
    26.17
    29.56
  

    L1
    max
    　
    0.6
    0.8
    1
    1
    1
    1.2
    1.2
    1.4
    1.4
    2
    2
    3
    3
    3
    3
  

    k
    Nominal Size
    　
    1.1
    1.4
    1.7
    2
    2.4
    2.8
    3.5
    4
    4.8
    5.3
    6.4
    7.5
    8.8
    10
    11.5
  

    Grade A
    max
    1.225
    1.525
    1.825
    2.125
    2.525
    2.925
    3.65
    4.15
    4.95
    5.45
    6.58
    7.68
    8.98
    10.18
    11.715
  

    min
    0.975
    1.275
    1.575
    1.875
    2.275
    2.675
    3.35
    3.85
    4.65
    5.15
    6.22
    7.32
    8.62
    9.82
    11.285
  

    Grade B
    max
    1.3
    1.6
    1.9
    2.2
    2.6
    3
    3.74
    4.24
    5.04
    5.54
    6.69
    7.79
    9.09
    10.29
    11.85
  

    min
    0.9
    1.2
    1.5
    1.8
    2.2
    2.6
    3.26
    3.76
    4.56
    5.06
    6.11
    7.21
    8.51
    9.71
    11.15
  

    k1
    Grade A
    min
    0.68
    0.89
    1.1
    1.31
    1.59
    1.87
    2.35
    2.7
    3.26
    3.61
    4.35
    5.12
    6.03
    6.87
    7.9
  

    Grade B
    min
    0.63
    0.84
    1.05
    1.26
    1.54
    1.82
    2.28
    2.63
    3.19
    3.54
    4.28
    5.05
    5.96
    6.8
    7.81
  

    r
    min
    　
    0.1
    0.1
    0.1
    0.1
    0.1
    0.2
    0.2
    0.25
    0.25
    0.4
    0.4
    0.6
    0.6
    0.6
    0.6
  

    s
    max=nominal size
    　
    3.2
    4
    5
    5.5
    6
    7
    8
    10
    11
    13
    16
    18
    21
    24
    27
  

    Grade A
    min
    3.02
    3.82
    4.82
    5.32
    5.82
    6.78
    7.78
    9.78
    10.73
    12.73
    15.73
    17.73
    20.67
    23.67
    26.67
  

    Grade B
    min
    2.9
    3.7
    4.7
    5.2
    5.7
    6.64
    7.64
    9.64
    10.57
    12.57
    15.57
    17.57
    20.16
    23.16
    26.16
  

    
  

       Thread  Size
d
    M20
    (M22)
    M24
    (M27)
    M30
    (M33)
    M36
    (M39)
    M42
    (M45)
    M48
    (M52)
    M56
    (M60)
    M64
  

    P
    Pitch
    　
    2.5
    2.5
    3
    3
    3.5
    3.5
    4
    4
    4.5
    4.5
    5
    5
    5.5
    5.5
    6
  

    b
    L≤125
    　
    46
    50
    54
    60
    66
    72
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    125＜L≤200
    　
    52
    56
    60
    66
    72
    78
    84
    90
    96
    102
    108
    116
    -
    -
    -
  

    L＞200
    　
    65
    69
    73
    79
    85
    91
    97
    103
    109
    115
    121
    129
    137
    145
    153
  

    c
    max
    　
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    0.8
    1
    1
    1
    1
    1
    1
    1
    1
  

    min
    　
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.2
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
    0.3
  

    da
    max
    　
    22.4
    24.4
    26.4
    30.4
    33.4
    36.4
    39.4
    42.4
    45.6
    48.6
    52.6
    56.6
    63
    67
    71
  

    ds
    max=nominal size
    　
    20
    22
    24
    27
    30
    33
    36
    39
    42
    45
    48
    52
    56
    60
    64
  

    Grade A
    min
    19.67
    21.67
    23.67
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    min
    19.48
    21.48
    23.48
    26.48
    29.48
    32.38
    35.38
    38.38
    41.38
    44.38
    47.38
    51.26
    55.26
    59.26
    63.26
  

    dw
    Grade A
    min
    28.19
    31.71
    33.61
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    min
    27.7
    31.35
    33.25
    38
    42.75
    46.55
    51.11
    55.86
    59.95
    64.7
    69.45
    74.2
    78.66
    83.41
    88.16
  

    e
    Grade A
    min
    33.53
    37.72
    39.98
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    min
    32.95
    37.29
    39.55
    45.2
    50.85
    55.37
    60.79
    66.44
    71.3
    76.95
    82.6
    88.25
    93.56
    99.21
    104.86
  

    L1
    max
    　
    4
    4
    4
    6
    6
    6
    6
    6
    8
    8
    10
    10
    12
    12
    13
  

    k
    Nominal Size
    　
    12.5
    14
    15
    17
    18.7
    21
    22.5
    25
    26
    28
    30
    33
    35
    38
    40
  

    Grade A
    max
    12.715
    14.215
    15.215
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    min
    12.285
    13.785
    14.785
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    max
    12.85
    14.35
    15.35
    17.35
    19.12
    21.42
    22.92
    25.42
    26.42
    28.42
    30.42
    33.5
    35.5
    38.5
    40.5
  

    min
    12.15
    13.65
    14.65
    16.65
    18.28
    20.58
    22.08
    24.58
    25.58
    27.58
    29.58
    32.5
    34.5
    37.5
    39.5
  

    k1
    Grade A
    min
    8.6
    9.65
    10.35
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    min
    8.51
    9.56
    10.26
    11.66
    12.8
    14.41
    15.46
    17.21
    17.91
    19.31
    20.71
    22.75
    24.15
    26.25
    27.65
  

    r
    min
    　
    0.8
    0.8
    0.8
    1
    1
    1
    1
    1
    1.2
    1.2
    1.6
    1.6
    2
    2
    2
  

    s
    max=nominal size
    　
    30
    34
    36
    41
    46
    50
    55
    60
    65
    70
    75
    80
    85
    90
    95
  

    Grade A
    min
    29.67
    33.38
    35.38
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
  

    Grade B
    min
    29.16
    33
    35
    40
    45
    49
    53.8
    58.8
    63.1
    68.1
    73.1
    78.1
    82.8
    87.8
    92.8
  

Thread Size d	M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12	(M14)	M16	(M18)
P	Pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75	2	2	2.5
b	L≤125		9	10	11	12	13	14	16	18	20	22	26	30	34	38	42
125＜L≤200		15	16	17	18	19	20	22	24	26	28	32	36	40	44	48
L＞200		28	29	30	31	32	33	35	37	39	41	45	49	53	57	61
c	max		0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.6	0.6	0.6	0.6	0.6	0.8	0.8
min		0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.2	0.2
da	max		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7	15.7	17.7	20.2
ds	max=nominal size		1.6	2	2.5	3	3.5	4	5	6	7	8	10	12	14	16	18
Grade A	min	1.46	1.86	2.36	2.86	3.32	3.82	4.82	5.82	6.78	7.78	9.78	11.73	13.73	15.73	17.73
Grade B	min	1.35	1.75	2.25	2.75	3.2	3.7	4.7	5.7	6.64	7.64	9.64	11.57	13.57	15.57	17.57
dw	Grade A	min	2.54	3.34	4.34	4.84	5.34	6.2	7.2	8.88	9.63	11.63	14.63	16.63	19.64	22.49	25.34
Grade B	min	2.42	3.22	4.22	4.72	5.22	6.06	7.06	8.74	9.47	11.47	14.47	16.47	19.15	22	24.85
e	Grade A	min	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12	14.38	17.77	20.03	23.36	26.75	30.14
Grade B	min	3.28	4.18	5.31	5.88	6.44	7.5	8.63	10.89	11.94	14.2	17.59	19.85	22.78	26.17	29.56
L1	max		0.6	0.8	1	1	1	1.2	1.2	1.4	1.4	2	2	3	3	3	3
k	Nominal Size		1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8	5.3	6.4	7.5	8.8	10	11.5
Grade A	max	1.225	1.525	1.825	2.125	2.525	2.925	3.65	4.15	4.95	5.45	6.58	7.68	8.98	10.18	11.715
min	0.975	1.275	1.575	1.875	2.275	2.675	3.35	3.85	4.65	5.15	6.22	7.32	8.62	9.82	11.285
Grade B	max	1.3	1.6	1.9	2.2	2.6	3	3.74	4.24	5.04	5.54	6.69	7.79	9.09	10.29	11.85
min	0.9	1.2	1.5	1.8	2.2	2.6	3.26	3.76	4.56	5.06	6.11	7.21	8.51	9.71	11.15
k1	Grade A	min	0.68	0.89	1.1	1.31	1.59	1.87	2.35	2.7	3.26	3.61	4.35	5.12	6.03	6.87	7.9
Grade B	min	0.63	0.84	1.05	1.26	1.54	1.82	2.28	2.63	3.19	3.54	4.28	5.05	5.96	6.8	7.81
r	min		0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25	0.4	0.4	0.6	0.6	0.6	0.6
s	max=nominal size		3.2	4	5	5.5	6	7	8	10	11	13	16	18	21	24	27
Grade A	min	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73	12.73	15.73	17.73	20.67	23.67	26.67
Grade B	min	2.9	3.7	4.7	5.2	5.7	6.64	7.64	9.64	10.57	12.57	15.57	17.57	20.16	23.16	26.16

Thread Size d	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)	M42	(M45)	M48	(M52)	M56	(M60)	M64
P	Pitch		2.5	2.5	3	3	3.5	3.5	4	4	4.5	4.5	5	5	5.5	5.5	6
b	L≤125		46	50	54	60	66	72	-	-	-	-	-	-	-	-	-
125＜L≤200		52	56	60	66	72	78	84	90	96	102	108	116	-	-	-
L＞200		65	69	73	79	85	91	97	103	109	115	121	129	137	145	153
c	max		0.8	0.8	0.8	0.8	0.8	0.8	0.8	1	1	1	1	1	1	1	1
min		0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3
da	max		22.4	24.4	26.4	30.4	33.4	36.4	39.4	42.4	45.6	48.6	52.6	56.6	63	67	71
ds	max=nominal size		20	22	24	27	30	33	36	39	42	45	48	52	56	60	64
Grade A	min	19.67	21.67	23.67	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	min	19.48	21.48	23.48	26.48	29.48	32.38	35.38	38.38	41.38	44.38	47.38	51.26	55.26	59.26	63.26
dw	Grade A	min	28.19	31.71	33.61	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	min	27.7	31.35	33.25	38	42.75	46.55	51.11	55.86	59.95	64.7	69.45	74.2	78.66	83.41	88.16
e	Grade A	min	33.53	37.72	39.98	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	min	32.95	37.29	39.55	45.2	50.85	55.37	60.79	66.44	71.3	76.95	82.6	88.25	93.56	99.21	104.86
L1	max		4	4	4	6	6	6	6	6	8	8	10	10	12	12	13
k	Nominal Size		12.5	14	15	17	18.7	21	22.5	25	26	28	30	33	35	38	40
Grade A	max	12.715	14.215	15.215	-	-	-	-	-	-	-	-	-	-	-	-
min	12.285	13.785	14.785	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	max	12.85	14.35	15.35	17.35	19.12	21.42	22.92	25.42	26.42	28.42	30.42	33.5	35.5	38.5	40.5
min	12.15	13.65	14.65	16.65	18.28	20.58	22.08	24.58	25.58	27.58	29.58	32.5	34.5	37.5	39.5
k1	Grade A	min	8.6	9.65	10.35	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	min	8.51	9.56	10.26	11.66	12.8	14.41	15.46	17.21	17.91	19.31	20.71	22.75	24.15	26.25	27.65
r	min		0.8	0.8	0.8	1	1	1	1	1	1.2	1.2	1.6	1.6	2	2	2
s	max=nominal size		30	34	36	41	46	50	55	60	65	70	75	80	85	90	95
Grade A	min	29.67	33.38	35.38	-	-	-	-	-	-	-	-	-	-	-	-
Grade B	min	29.16	33	35	40	45	49	53.8	58.8	63.1	68.1	73.1	78.1	82.8	87.8	92.8

FAQs

What is DIN931 bolts？

DIN931 bolts are half-buckle hexagonal bolts. It complies with the standards set by the Deutsches Institut für Normung (DIN), the German Institute for Standardization.

DIN931 bolts are typically made from materials such as steel, stainless steel or other alloys, depending on application requirements. Commonly used materials for DIN931 bolts include:
1. DIN931 bolts made of carbon steel: Suitable for general applications, carbon steel bolts have good strength and hardness.
2. DIN931 bolts made of stainless steel: Stainless steel bolts are known for their corrosion resistance and are very suitable for environments that require rust prevention.
3. DIN931 bolts made of alloy steel: Alloy steel bolts have higher strength and wear resistance and are preferred for applications requiring extra strength and durability.
4. Plastic material DIN931 bolts: It is often used in food machinery and other fields.

In addition, there are hexagonal bolts made of copper and aluminum. DIN931 bolts are available in a variety of different materials to suit a variety of applications.

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