Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of stainless steel din7991 csk head hex socket bolt in China. Welcome to buy bulk high quality stainless steel din7991 csk head hex socket bolt 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 |
Hexagon Socket Countersunk Head Cap Screws |
|
Head Type |
Countersunk Head |
|
Standard |
DIN7991 |
|
Material |
Stainless Steel/A2/A4/18-8/Carbon Steel |
|
Finish/Surface treatment |
Plain/Galvanized/Zinc Plated/HDG/Black Oxide |
|
Size |
M3-M24(customizable) |
|
Measuring |
Inch/Metric |
|
Trade terms |
EXW/FCA/FOB/CIF/DAP/DDP |
|
Packaging style |
Small boxes+cartons+pallets Small bags+cartons+pallets Bulk +cartons+pallets Bulk +bags+pallets |
|
Customization |
Available |
|
Payment terms |
30% T/T as deposit,70%balance before delivery |
|
Payment methods |
Bank account/Ali pay Qr code/Wechat Qr code/Western Union.... |
|
Original |
Handan city Hebei province China |
Product Structural Features
Countersunk head (90°)
Sits flush in a countersink, so it won't interfere with mating surfaces or sliding parts.
Hex socket drive
Tightened with a hex key or bit; compact tool access.
Metric threads
Standard metric diameters and pitches, with fine pitch available on request.
Material and strength
carbon steel 8.8/10.9, alloy steel up to 12.9, stainless A2-70/A4-70; class matched to the joint.
Finish options
plain, black oxide, zinc plated, and Dacromet-type coatings where corrosion demands it.
Made to order
non-standard sizes, materials and finishes quoted per project.
Surface Treatment Options
Plain / oiled：no plating; light oil for storage and transport only. Indoor, dry conditions.
Black oxide：dark finish for carbon steel, usually oiled. Minimal corrosion protection; not for humid or outdoor use.
Zinc plated：electroplated zinc, typically 5–8 μm. General indoor and sheltered outdoor fastening.
Nickel plated：bright decorative finish with moderate protection; chosen mainly for appearance.
Hot-dip galvanized：thick zinc layer, typically 40–80 μm, for outdoor and high-corrosion service. Coating adds to thread dimensions-check fit and consider oversize tapping.
Stainless natural：no coating; corrosion resistance comes from the grade itself (304 for general, 316 for chloride exposure).
|
Thread Size d |
M3 |
M4 |
M5 |
M6 |
M8 |
M10 |
M12 |
(M14) |
M16 |
(M18) |
M20 |
(M22) |
M24 |
|
|
p |
Pitch |
0.5 |
0.7 |
0.8 |
1 |
1.25 |
1.5 |
1.75 |
2 |
2 |
2.5 |
2.5 |
2.5 |
3 |
|
α |
tol.(+2) |
90° |
90° |
90° |
90° |
90° |
90° |
90° |
90° |
90° |
90° |
90° |
60° |
60° |
|
b |
L ≤ 125 |
12 |
14 |
16 |
18 |
22 |
26 |
30 |
34 |
38 |
42 |
46 |
50 |
54 |
|
125 ＜ L ≤ 200 |
/ |
/ |
/ |
24 |
28 |
32 |
36 |
40 |
44 |
48 |
52 |
56 |
60 |
|
|
L ＞ 200 |
/ |
/ |
/ |
/ |
/ |
45 |
49 |
53 |
57 |
61 |
65 |
69 |
73 |
|
|
dk |
Max. = Nominal |
6 |
8 |
10 |
12 |
16 |
20 |
24 |
27 |
30 |
33 |
36 |
36 |
39 |
|
Min. |
5.7 |
7.64 |
9.64 |
11.57 |
15.57 |
19.48 |
23.48 |
26.48 |
29.48 |
32.38 |
35.38 |
35.38 |
38.38 |
|
|
ds |
Max. = Nominal |
3 |
4 |
5 |
6 |
8 |
10 |
12 |
14 |
16 |
18 |
20 |
22 |
24 |
|
Min. |
2.86 |
3.82 |
4.82 |
5.82 |
7.78 |
9.78 |
11.73 |
13.73 |
15.73 |
17.73 |
19.67 |
21.67 |
23.67 |
|
|
e |
Min. |
2.3 |
2.87 |
3.44 |
4.58 |
5.72 |
6.86 |
9.15 |
11.43 |
11.43 |
13.72 |
13.72 |
16 |
16 |
|
k |
Max |
1.7 |
2.3 |
2.8 |
3.3 |
4.4 |
5.5 |
6.5 |
7 |
7.5 |
8 |
8.5 |
13.1 |
14 |
|
s |
Nominal |
2 |
2.5 |
3 |
4 |
5 |
6 |
8 |
10 |
10 |
12 |
12 |
14 |
14 |
|
Min. |
2.02 |
2.52 |
3.02 |
4.02 |
5.02 |
6.02 |
8.025 |
10.025 |
10.025 |
12.032 |
12.032 |
14.032 |
14.032 |
|
|
Max. |
2.1 |
2.6 |
3.1 |
4.12 |
5.14 |
6.14 |
8.175 |
10.175 |
10.175 |
12.212 |
12.212 |
14.212 |
14.212 |
|
|
t |
Max. = Nominal |
1.2 |
1.8 |
2.3 |
2.5 |
3.5 |
4.4 |
4.6 |
4.8 |
5.3 |
5.5 |
5.9 |
8.8 |
10.3 |
|
Min. |
0.95 |
1.55 |
2.05 |
2.25 |
3.2 |
4.1 |
4.3 |
4.5 |
5 |
5.2 |
5.6 |
8.44 |
9.87 |
|
Typical Applications
DIN 7991 countersunk screws are used where the head must sit flush: machine guards and covers, sheet-metal and panel assemblies, jig and fixture plates, and furniture fittings. Because the 90° head sinks into a countersink, it won't catch on moving parts or break the surface line-useful on sliding surfaces, visible panels and anywhere a protruding head would interfere.
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
Hot Tags: stainless steel din7991 csk head hex socket bolt, China stainless steel din7991 csk head hex socket bolt manufacturers, suppliers, factory
