Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of carbon steel hexagon socket countersunk head cap bolt grade 8.8 in China. Welcome to buy bulk high quality carbon steel hexagon socket countersunk head cap bolt grade 8.8 made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Drywall screws are not priced by quantity alone. Weight per piece has a direct effect on cost, especially for large orders. A small difference in screw weight can change the total tonnage and the final price.
Send us the details, drawing on my factory-floor experience, we can analyze your specific market conditions and store requirements to help you determine the most precise and appropriate pricing.e-no guesswork on weight.
Please specify:
01
- Diameter × length
- Head type (bugle head, countersunk, etc.)
02
- Thread type (fine or coarse)
- Coating (black phosphate, gray phosphate, zinc, etc.)
03
- Target weight per piece (g/pc)
- Order quantity
04
- Packaging (dimensions of the box/outer carton, package weight, and whether the logo style or color can be customized)
Product Specification
| Item | Allen bolts |
| Standard | DIN912 |
| Material | Carbon Steel |
| Grade/Class | 8.8 |
| Finish/Surface Treatment | Galvanized/Zinc Plated/HDG/Black Oxide |
| Drive Type | Hex Socket |
| Thread Type | Metric Thread |
| Customization | Available |
|
Screw Thread d |
M10 |
M12 |
(M14) |
M16 |
M20 |
M24 |
M30 |
M36 |
||
|
P |
Pitch |
1.5 |
1.75 |
2 |
2 |
2.5 |
3 |
3.5 |
4 |
|
|
dk |
max |
16.27 |
18.27 |
21.33 |
24.33 |
30.33 |
36.39 |
45.39 |
54.46 |
|
|
min |
15.73 |
17.73 |
20.67 |
23.67 |
29.67 |
35.61 |
44.61 |
53.54 |
||
|
ds |
max |
10.00 |
12.00 |
14.00 |
16.00 |
20.00 |
24.00 |
30.00 |
36.00 |
|
|
min |
9.78 |
11.73 |
13.73 |
15.73 |
19.67 |
23.67 |
29.67 |
35.61 |
||
|
k |
max |
10.00 |
12.00 |
14.00 |
16.00 |
20.00 |
24.00 |
30.00 |
36.00 |
|
|
min |
9.64 |
11.57 |
13.57 |
15.57 |
19.48 |
23.48 |
29.48 |
35.38 |
||
|
s |
Nominal size |
8 |
10 |
12 |
14 |
17 |
19 |
22 |
27 |
|
|
min |
8.025 |
10.025 |
12.032 |
14.032 |
17.05 |
19.065 |
22.065 |
27.065 |
||
|
max |
12.9 |
8.115 |
10.115 |
12.142 |
14.142 |
17.23 |
19.275 |
22.275 |
27.275 |
|
|
other |
8.175 |
10.175 |
12.212 |
14.212 |
17.23 |
19.275 |
22.275 |
27.275 |
||
|
t |
min |
5 |
6 |
7 |
8 |
10 |
12 |
15.5 |
19 |
|
|
Length of Thread b |
- |
- |
- |
- |
- |
- |
- |
- |
||
Key Features
Class 8.8
Tensile strength ≥800 MPa,Yield strength ≥ 640 MPa, for bolted joints specified to 8.8.
01
Hex socket drive
Tightened with a hex key or bit; no wrench clearance needed around the head, so it fits tight assemblies.
02
Cylindrical head
Compact profile for socket head cap screw applications.
03
Metric threads
Diameters, pitches and lengths to match your assembly.
04
Finish options
Black oxide, zinc plating and other coatings available to spec.
05
Typical Applications
Machine building
mounting brackets, guards, motor mounts and linear rail components.
Automation and equipment
frame assembly, sensor and actuator mounting, panel fixing.
Metal fabrication
fastening plates and profiles where the compact cylindrical head fits flush in a counterbore.
Fixtures and jigs
clamping and positioning components in tooling.
Maintenance and replacement
matching the original diameter, pitch and property class.
Custom Packaging&Private Label Available
Choose from bulk cartons, poly bags with branded labels, or retail-ready packaging. Minimum order quantities can be adjusted to support both small contractors and large-scale procurement needs.
We offer custom box/bags printing and labeling services to help you build your own product line.
FAQ
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