Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of grade 4.8 black hexagon flange nut with serrations in China. Welcome to buy bulk high quality grade 4.8 black hexagon flange nut with serrations 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 |
Flange Nut(Serrated) |
|
Standard |
DIN6923 |
|
Material |
Carbon steel |
|
Grade/Class |
4.8 |
|
Finish/Surface treatment |
Black Oxide |
|
Serration |
Yes |
|
Size |
M5-M20 |
|
Head Style |
Hexagonal |
|
Feature |
Serrated Flange |
DIN 6923 serrated flange nut, black flange nut, black oxide hex nut, carbon steel flange nut, metric hex flange nut, serrated hex nut, industrial fasteners, automotive flange nut, machinery fastening nut, bulk flange nuts, wholesale fasteners, custom flange nut supplier.
Why Choose Black Oxide Serrated Flange Nuts?
Flange replaces the washer
The integrated flange spreads clamp load, so you skip a separate flat washer and one assembly step.
Serrated bearing surface
Teeth bite into the contact face and add friction against vibration loosening; not a substitute for a lock nut in high-vibration joints.
Black oxide finish
Uniform dark appearance for black-finished machinery and equipment. Light oil protection only: indoor and dry use, not for humid or outdoor service.
Class 4.8 carbon steel
Tensile ≥400 MPa, pairs with 4.8/5.8 bolts. Do not pair with 8.8 bolts in a load-bearing joint:the nut becomes the weak point.
Metric threads
Common coarse and fine pitches to match standard bolts.
Factory direct
Bulk cartons and pallets, export packaging, and size/finish confirmed against your spec before production.
Common Fastener Problems & Our Solutions
1. Nut and Bolt Strength Compatibility
Pain: A nut below the joint's strength requirement can strip before the bolt fails-a risk that shows up only under load.
Our solution: We confirm nut and bolt class together. Class 4.8 nuts pair with 4.8/5.8 bolts only; if the joint calls for 8.8, we quote Class 8 instead.
2. Black Finish and Rust Protection
Pain: Black oxide is often mistaken for corrosion protection. Without it, parts rust in storage, transit or humid shops.
Our solution: Black oxide ships oiled, indoor dry use only. For long transit or humid destinations we add VCI packaging; for corrosive service, we quote zinc or black zinc plating.
3. Serrations Marking the Contact Surface
Pain: Serrated flange nuts leave marks on painted, aluminum or soft surfaces, getting assemblies rejected on appearance.
Our solution: Tell us the contact material. Soft or visible surfaces get smooth flange nuts or a flat washer; serrated versions stay on unpainted steel and hidden joints.
4. Mixed Sizes or Specifications in Bulk Orders
Pain: Mixed sizes or wrong specs in one shipment cause sorting delays, assembly errors and returns.
Our solution: We pack by size and grade, mark size and class on every carton, and lock the spec sheet before production. Mixed POs go in separate inner boxes, not loose.
5. Inconsistent Quality on Repeat Orders
Pain: Drift in thread fit, dimensions or black finish between batches breaks replenishment.
Our solution: Each part number keeps one approved spec and one retained sample; repeat orders are checked against it-dimensions, thread fit, finish-before shipment.
|
Thread size d |
M5 |
M6 |
M8 |
M10 |
M12 |
M14 |
M16 |
M20 |
||
|
P |
Pitch |
Coarse thread |
0.8 |
1 |
1.25 |
1.5 |
1.75 |
2 |
2 |
2.5 |
|
Fine thread 1 |
/ |
/ |
1 |
1.25 |
1.5 |
1.5 |
1.5 |
1.5 |
||
|
Fine thread 2 |
/ |
/ |
/ |
1 |
1.25 |
/ |
/ |
/ |
||
|
b |
Reference value |
L ≤ 125 |
16 |
18 |
22 |
26 |
30 |
34 |
38 |
46 |
|
125 ＜ L ≤ 200 |
/ |
/ |
28 |
32 |
36 |
40 |
44 |
52 |
||
|
L ＞ 200 |
/ |
/ |
/ |
/ |
/ |
/ |
57 |
65 |
||
|
c |
min |
1 |
1.1 |
1.2 |
1.5 |
1.8 |
2.1 |
2.4 |
3 |
|
|
da |
Type A |
max |
5.7 |
6.8 |
9.2 |
11.2 |
13.7 |
15.7 |
17.7 |
22.4 |
|
Type B |
max |
6.2 |
7.4 |
10 |
12.6 |
15.2 |
17.7 |
20.7 |
25.7 |
|
|
dc |
max |
11.8 |
14.2 |
18 |
22.3 |
26.6 |
30.5 |
35 |
43 |
|
|
ds |
max |
5 |
6 |
8 |
10 |
12 |
14 |
16 |
20 |
|
|
min |
4.82 |
5.82 |
7.78 |
9.78 |
11.73 |
13.73 |
15.73 |
19.67 |
||
|
du |
max |
5.5 |
6.6 |
9 |
11 |
13.5 |
15.5 |
17.5 |
22 |
|
|
dw |
min |
9.8 |
12.2 |
15.8 |
19.6 |
23.8 |
27.6 |
31.9 |
39.9 |
|
|
e |
min |
8.71 |
10.95 |
14.26 |
16.5 |
17.62 |
19.86 |
23.15 |
29.87 |
|
|
f |
max |
1.4 |
2 |
2 |
2 |
3 |
3 |
3 |
4 |
|
|
k |
max |
5.4 |
6.6 |
8.1 |
9.2 |
11.5 |
12.8 |
14.4 |
17.1 |
|
|
K1 |
min |
2 |
2.5 |
3.2 |
3.6 |
4.6 |
5.1 |
5.8 |
6.8 |
|
|
r1 |
min |
0.25 |
0.4 |
0.4 |
0.4 |
0.6 |
0.6 |
0.6 |
0.8 |
|
|
r2 |
max |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.9 |
1 |
1.2 |
|
|
r3 |
min |
0.1 |
0.1 |
0.15 |
0.2 |
0.25 |
0.3 |
0.35 |
0.4 |
|
|
r4 |
≈ |
3 |
3.4 |
4.3 |
4.3 |
6.4 |
6.4 |
6.4 |
8.5 |
|
|
s |
Max = Nominal |
8 |
10 |
13 |
15 |
16 |
18 |
21 |
27 |
|
|
min |
7.78 |
9.78 |
12.73 |
14.73 |
15.73 |
17.73 |
20.67 |
26.67 |
||
|
t |
max |
0.15 |
0.2 |
0.25 |
0.3 |
0.35 |
0.45 |
0.5 |
0.65 |
|
|
min |
0.05 |
0.05 |
0.1 |
0.15 |
0.15 |
0.2 |
0.25 |
0.3 |
||
|
Thread length b |
- |
- |
- |
- |
- |
- |
- |
- |
||
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.
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