DIN 7991 - Hexagon socket countersunk head cap screws
Current norm: DIN EN ISO 10462
Equivalent norms: ISO 10642; UNI 5933;
Made from alloy steel, these screws are nearly twice as strong as stainless steel flat head screws. They're angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Black-oxide alloy steel screws have mild corrosion resistance in dry environments.
Zinc-plated alloy steel screws resist corrosion in wet environments. Screws with a blue-dyed finish have a distinctive blue color that makes them easy to identify.
More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. All are passivated for added protection against oxidation and corrosion. They may be mildly magnetic. Screws are angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.
Makings:QBH
Steel: 8.8, 10.9, 12.9
Stainless: A2, A4
Plastic: -
Non Ferrous: -
Thread: 6g
Screw Thread
d | |
| P | Pitch | | α | tol.(+2) | | b | L≤125mm | | 125＜L ≤ 200 | | L＞200 | | dk | max=nominal size | | min | | ds | max=nominal size | | min | | e | min | | k | max | | s | Nominal Size | | min | | max | | t | max=nominal size | | min | | | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 60° | 60° | | 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 | | / | / | / | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | | / | / | / | / | / | 45 | 49 | 53 | 57 | 61 | 65 | 69 | 73 | | 6 | 8 | 10 | 12 | 16 | 20 | 24 | 27 | 30 | 33 | 36 | 36 | 39 | | 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 | | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | | 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 | | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | 13.72 | 16 | 16 | | 1.7 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 | 7 | 7.5 | 8 | 8.5 | 13.1 | 14 | | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 10 | 12 | 12 | 14 | 14 | | 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 | | 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 | | 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 | | 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 | |
Process flow
Cold forging
Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment(if need) ➨ Finish ➨ Packing
Product Grade
Class4.8 Class5.8 Class6.8 Class8.8 Class10.9 Class12.9
A2-70 A2-80 A4-70 A4-80
Materials and Chemical compstition
1008
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Al |
| 0.06 | 0.06 | 0.33 | 0.013 | 0.003 | 0.01 | 0 | 0.01 | 0.028 |
1035
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.34 | 0.13 | 0.73 | 0.012 | 0.002 | 0.02 | 0.01 | 0.02 |
10B21
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | B |
| 0.2 | 0.04 | 0.81 | 0.017 | 0.007 | 0.017 | 0.0021 |
1045
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.45 | 0.23 | 0.58 | 0.014 | 0.006 | 0.057 | 0.008 | 0.016 |
40CR
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.4 | 0.21 | 0.54 | 0.015 | 0.008 | 0.95 | 0.02 | 0.02 |
35CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.35 | 0.22 | 0.59 | 0.01 | 0.003 | 0.93 | 0.01 | 0.01 | 0.21 |
42CRMO
| CHEMICAL COMPOSI % |
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
| 0.42 | 0.27 | 0.92 | 0.013 | 0.004 | 1.01 | 0.03 | 0.04 | 0.2 |
| CHEMICAL COMPOSI(% ) |
| Type | C | Si | Mn | P | S | Ni | Cr | Mo | Cu |
| ≤ | ≤ | ≤ | ≤ | ≤ | ≥ | ≥ | ≥ | ≈ |
| 201Cu | 0.08 | 1.00 | 7.5-10 | 0.06 | 0.03 | 4.00-6.00 | 14.0-17.0 | | 2.0-3.0 |
| 201 | 0.15 | 1.00 | 8.50 | 0.06 | 0.03 | 3.50-5.50 | 16.0-18.0 | | |
| 202 | 0.15 | 1.00 | 7.5-10 | 0.06 | 0.03 | 4.00-6.00 | 17.0-19.0 | | |
| 301 | 0.15 | 1.00 | 2.00 | 0.045 | 0.03 | 5.00-8.00 | 16.0-18.0 | | |
| 302 | 0.15 | 1.00 | 2.00 | 0.045 | 0.03 | 8.00-10.0 | 17.0-19.0 | | |
XM7
(302HQ) | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 8.50-10.5 | 17.0-9.00 | | 3.0-4.0 |
| 303 | 0.15 | 1.00 | 2.00 | 0.20 | ≥0.15 | 8.00-10.0 | 17.0-19.0 | ≤0.60 | |
| 304 | 0.07 | 1.00 | 2.00 | 0.035 | 0.03 | 8.00-10.0 | 18.0-20.0 | | |
| 304HC | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 8.00-10.0 | 17.0-19.0 | | 1.0-3.0 |
| 304M | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 8.50-10.0 | 18.0-20.0 | | |
| 316 | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 10.0-14.0 | 16.0-18.0 | 2.0-3.0 | |
316L
(12Ni) | 0.03 | 1.00 | 2.00 | 0.045 | 0.03 | 12.0-15.0 | 16.0-18.0 | 2.0-3.0 | |
316L
(10Ni) | 0.03 | 1.00 | 2.00 | 0.045 | 0.03 | 10.0-14.0 | 16.0-18.0 | 2.0-3.0 | |
| 321 | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 9.00-13.0 | 17.0-19.0 | | Ti≤5*C% |
| 2520 | 0.08 | 1.00 | 2.00 | 0.035 | 0.03 | 19.0-22.0 | 24.0-26.0 | | |
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
QBH BULK
20-25KG/CTN,36CTNS/PALLET
20-30KG/BAGS,36BAGS/PALLET
ONE TON/BOXES
50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING
Packing in small boxes according to customer’s requirements
Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE
SOLID WOOD FUMIGATION PALLET
EURO Pallet
THREE SPLINT PALLET
WOODEN BOX
The advantages of QBH
- QBH brand sales to the main quality assurance.
- Years of export trade management, excellent service, word-of-mouth guarantee.
- By working with TUV,escort for quality.
- Customization of non-standard parts can be made according to customer's requirements and drawings.
- For quality customers,we can provide a certain credit period.
Product Tags:
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DIN 7991 Carbon Steel CL8.8 10.9 12.9 Countersunk Head Screws Images
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