LOW HEAD AND ULTRA-LOW HEAD HEXAGON SOCKET HEAD CAP SCREWS
CBSS（Ultra-low head hexagon socket head cap screws）
t
L
725
Base unit price
CBS
CBSST
1 ～ 99 pcs. 100 ～ 300 1 ～ 99 pcs. 100 ～ 300
27
11
27
14
29
13
32
16
31
15
36
19
30
14
33
17
32
34
35
34
16
18
19
18
38
42
45
42
20
23
25
23
32
16
38
20
36
39
36
19
22
19
48
54
48
27
31
27
34
18
42
23
36
39
42
46
53
19
22
25
29
36
48
54
60
68
86
27
31
35
39
51
49
32
77
45
48
31
75
44
L
E
B
Strength class
～


S45C（M3～8・M12）
22～32HRC Black oxide（Fe3O4）
8.8
SCM435
（M10）
SUSXM7
A2－50
－
－
ℓ
Catalog No.
t
M×P A E B max.
CBS CBSST Type M－L
CBS 3－6
CBSST 8
Full
10
Full
3×0.5 5.5 2 2 1.5 thread thread
12
16
12
20
CBS 4－6
CBSST 8
10
Full
Full
4×0.7 7 2.8 2.5 2.3 thread thread
12
16
20
25
CBS 5－8
CBSST 10
12
Full
Full
5×0.8 8.5 3.5 3 2.7 thread thread
16
20
25
16 24
30
CBS 6－8
CBSST 10
12
Full
Full
thread
16
thread
20
6×1.0 10 4 4
3
25
30
35
18
26
40
45
CBS 8－10
CBSST 12
16
Full
thread Full
20
thread
25
8×1.25 13 5 5 3.8
30
35
40
22
30
45
50
CBS 10－16
CBSST 20
25
Full
Full
thread thread
30
10×1.5 16 6 6 4.5
35
40
45
32 36
50
CBS 12－20
CBSST 25
30
Full
Full
12×1.75 18 7 8
5 thread thread
35
40
45
30 40
50
～ Equivalent to S20C
 48HRC
 Thin zinc coating
ℓ1
～ SCM435
 32～39HRC
 Black oxide
（Fe3O4）
ℓ1
Catalog No.
Base unit price
t
max. max. Type M－L 1～49 pcs. 50～300
CBSS 3－6
43
28
3×0.5 6 1.3 1.5
2
1.6
8
44
29
10
CBSS 4－6
38
23
4×0.7 8 1.5 2
2.5
1.6
8
39
24
40
25
10
CBSS 5－8
41
26
10
42
27
5×0.8 9 1.5 3
3
1.6
12
43
28
16
44
29
45
30
20
CBSS 6－8
44
29
10
46
31
12
47
32
6×1.0 10 1.5 3
4
2.0
16
49
34
20
51
36
52
37
25
CBSS 8－8
89
72
10
84
67
12
65
49
8×1.25 13 1.5 4
5
2.5
16
67
51
20
69
53
25
72
56
72
56
30
CBSS10－10
108
90
12
94
76
16
78
61
10×1.5 16 1.5 5
5
3.0
20
80
63
25
81
64
89
72
30
M×P
A
E
B
 For larger orders, ask about prices/delivery.
※“Strength class”indicates the tensile strength of the threads.
50 33
54 37
57 39
64 46
69 51
62 44
66 48
71 53
74 56
79 60
83 64
88 69
91 72
94 75
85 66
89 70
108 88
110 90
115 95
138 116
78
87
95
110
120
105
113
126
132
144
153
165
171
177
158
165
210
218
225
270
46
52
56
66
73
63
68
76
80
88
93
101
108
109
96
101
130
134
139
168
Example: 8.8
A2－50
Indicates that the minimum tensile
Indicates that the minimum yield
2
2
strength is 500N/mm｛51kgf/mm
point or proof strength is 80% of
｝.
the tensile strength.
S
teel class A2
（Austenitic stainless steel）
Indicates that the minimum
tensile strength is 800N/mm2
2
.
｛81.6kgf/mm ｝
Order
Catalog No.
CBS 4－10
CBSS5－12
Dispatch
 2 of these products form a single pair for use.
Strength class 10.9
Head strength class M3～M8 5.8
M10
4.8
7
Days
Bolt
■Features
Low head hexagon socket head cap screws
・C an be used without modification in locations where the heads of
conventional hexagon socket head cap screws would cause an obstruction.
● Ultra-low head hexagon socket head cap screws
・Developed in order to reduce the space required for the height of the screw head.
・Unlike flat head screws, countersinking of the opposite material is not required.
d
1.8
1.8
1.8
1.8
2.5
2.5
2.5
3.4
3.4
Base unit price Volume discount unit price
No.
1 ～ 19 pairs 20 ～ 199 pairs
3
4
101
71
5
6
8
118
82
10
126
88
12
176
123
＊
176
16
252
＊
218
20
319
 Prices marked with ＊ apply to orders for 20～99 pairs.
NLDP
Dispatch
NLDP 6
（chrome-free）
Catalog No.
Type
t
Catalog No.
Order
7
Days
Example
Can be used without enlarging the
size of the bolt head counterbore.
■Set sales
Catalog No.
Type
Set price
No.
3
4
5
6
8
10
12
16
20
NLDP－B
Pairs/set
Order
Catalog No.
NLDP－B6
Be sure that the quantity is correct when ordering.

Example: An order for one NLDP－B6, will result in the delivery of 200 pairs.
5,040（25.2/pair）
168 pairs
6,720（33.6/pair）
8,400（42.0/pair）
15,120（75.6/pair）
15,120（151.2/pair）
84 pairs
17,640（176.4/pair）
Dispatch
7
Days
α＞β
α
■Principle of washers for loosening prevention
Washers for loosening prevention have wedge-shaped cams on the inside and radial ribs on
the outside. 2 of these washers form a single pair.
The cam angle
is set larger than the thread lead angle（β）
.
（α）
When a force acts to loosen the bolt, the cams of one washer press the cams of the other washer up
and away, however due to the wedge effect the washers do not separate by more than the thread pitch.
β
Correct
■Installing correctly
2 washers are delivered as a single pair, with adhesive already applied.
Before reusing these washers, check that the raised parts have not been crushed and that there is no
cracking. Then use in accordance with the correct installation method shown in the figure at right.
Remove any other washers or similar items before using these products.
■Precautions for repeated use
NLDP can be used repeatedly.At this time, be sure to use lubricating oil.
■Allowable temperature limit
25
20
NLDP
15
None
Ordinary washer
10
●
5
0
5
■Concerning the clamped material
Marks in the shape of the ribs on the outside of the washers will be left on the clamped material.
Use only clamped material with a hardness that is no greater than the hardness of the washers for loosening prevention.
Loosening prevention washer used: NLDP8
Bolt used: M8（strength class 12.9）
Clamped material used: Equivalent to S20C（28HRC） [Table]: Recommended bolt tightening torques and bolt tightening force when loosening prevention washers are used
30
0
Incorrect
When tightening a bolt and using washers for loosening prevention, refer to the
recommended values in the table below.
At values that are significantly less than the recommended values, the loosening prevention effects will not be achieved.
At values higher than the recommended values, removing the bolts will be difficult and the
loosening prevention washers may crack. Use caution.
■Graph of vibration test results
（reference）
Tester: Yanker type vibration tester
Amplitude: ±0.5mm
Frequency: 40 Hz
Incorrect
■Recommended tightening torque and tightening force
The maximum allowable temperature for NLDP is 200℃.
Do not use these washers at temperatures above this limit.

P.37
■Volume discount price
●CBS
・CBSST
Quantity
1～199
200～300
Applicable Base unit price Volume discount
price
Price list
5%
 For larger orders, ask about prices/delivery.
D
M3
7.0
3.4
M4
7.6
4.4
M5
9.0
5.4
M6
10.8
6.5
M8
13.5
8.7
M10
16.6
10.7
M12
19.5
13.0
M16
25.4
17.0
M20
30.7
21.4
 2 of these products form a single pair for use.
Tightening force kN
CBS
CBSST
E
ℓ
t
A
A
t
B
d
M×P
Type
NLDP
M×P
D
CBS （Low head hexagon socket head cap screw）
CBSST（Stainless steel low head hexagon socket head cap screw）
WASHERS FOR LOOSENING PREVENTION
15
10
20
25
Time sec.
[Fig.] Results of vibration tests with and without NLDP washers
NLDP
Bolt
M×P
3
4
5
6
8
10
12
16
20
3×0.5
4×0.7
5×0.8
6×1.0
8×1.3
10×1.5
12×1.8
16×2.0
20×2.5
Bolt strength class 12.9 Bolt strength class 10.9 Bolt strength class 8.8
µT＝0.12 GF＝0.75 µT＝0.14 GF＝0.71 µT＝0.14 GF＝0.71
Torque Tightening force Torque Tightening force Torque Tightening force
kN
Nm
kN
Nm
kN
Nm
2
3.9
4.6
6.7
9
10.9
15.7 15.4
37.6 28.1
74
44
127
65
310
120
607
188
µT: Thread coefficient of friction
 GF: Yield point ratio
1.7
3.8
7.5
13.1
31.3
62
106
258
506
3.2
5.6
9.1
12.9
23.4
37
54
100
156
1.3
3
5.9
10.3
24.8
49
84
203
398
2.4
4.2
6.8
9.7
17.6
28
40
75
118
726