NVS AISI 316 (A4-70) Stainless Steel Countersunk Socket Head Screw DIN 7991
AISI 316 (1.4401) · Countersunk head, hexagon socket drive, metric thread · DIN 7991 · ISO 10642 · M3–M20 · 10–100 mm · 90 sizes
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3,42₺ incl. VAT
excl. VAT: 2,85₺
Category
Stock Code
NVS-BE-HAVSA7991-316
Warranty Period
24 Month
Price
2,85 ₺ + VAT
NVS AISI 316 (A4-70) Stainless Steel Countersunk Socket Head Screw DIN 7991
NVS AISI 316 (A4-70) stainless steel countersunk socket head screw: countersunk head, hexagon socket drive, metric thread. Size range: M3–M20 · 10–100 mm (90 sizes). This screw has a conical countersunk head with a hexagon socket. The head sits in a countersunk hole flush with the surface, so it is used on flat surfaces where no protrusion is wanted.
AISI 316 (1.4401) is a molybdenum-alloyed stainless steel. It resists chloride media, sea water and chemicals significantly better than grade 304 and is recommended for swimming pools, coastal sites, chemical plants and outdoor use.
Applications
- Flush joints on boat and yacht fittings
- Treatment plants and the chemical industry
- Flush mounting in acidic or chlorinated environments
Size, weight and item code table
| Thread | Length | Weight | Item code |
|---|---|---|---|
| M3 | 10 mm | ≈ 0.57 g | NVS7991A4310 |
| M3 | 12 mm | ≈ 0.66 g | NVS7991A4312 |
| M3 | 16 mm | ≈ 0.84 g | NVS7991A4316 |
| M3 | 20 mm | ≈ 1 g | NVS7991A4320 |
| M3 | 25 mm | ≈ 1.4 g | NVS7991A4325 |
| M3 | 30 mm | ≈ 1.7 g | NVS7991A4330 |
| M4 | 10 mm | ≈ 1.1 g | NVS7991A4410 |
| M4 | 12 mm | ≈ 1.2 g | NVS7991A4412 |
| M4 | 16 mm | ≈ 1.6 g | NVS7991A4416 |
| M4 | 20 mm | ≈ 1.9 g | NVS7991A4420 |
| M4 | 25 mm | ≈ 2.3 g | NVS7991A4425 |
| M4 | 30 mm | ≈ 3 g | NVS7991A4430 |
| M4 | 35 mm | ≈ 3.5 g | NVS7991A4435 |
| M4 | 40 mm | ≈ 4 g | NVS7991A4440 |
| M5 | 10 mm | ≈ 1.9 g | NVS7991A4510 |
| M5 | 12 mm | ≈ 2.1 g | NVS7991A4512 |
| M5 | 16 mm | ≈ 2.6 g | NVS7991A4516 |
| M5 | 20 mm | ≈ 3.1 g | NVS7991A4520 |
| M5 | 25 mm | ≈ 3.8 g | NVS7991A4525 |
| M5 | 30 mm | ≈ 4.4 g | NVS7991A4530 |
| M5 | 35 mm | ≈ 5.5 g | NVS7991A4535 |
| M5 | 40 mm | ≈ 6.3 g | NVS7991A4540 |
| M5 | 45 mm | ≈ 7.1 g | NVS7991A4545 |
| M5 | 50 mm | ≈ 7.9 g | NVS7991A4550 |
| M5 | 60 mm | ≈ 9.4 g | NVS7991A4560 |
| M6 | 10 mm | ≈ 2.7 g | NVS7991A4610 |
| M6 | 12 mm | ≈ 3.1 g | NVS7991A4612 |
| M6 | 16 mm | ≈ 3.8 g | NVS7991A4616 |
| M6 | 20 mm | ≈ 4.5 g | NVS7991A4620 |
| M6 | 25 mm | ≈ 5.4 g | NVS7991A4625 |
| M6 | 30 mm | ≈ 6.3 g | NVS7991A4630 |
| M6 | 35 mm | ≈ 7.2 g | NVS7991A4635 |
| M6 | 40 mm | ≈ 9 g | NVS7991A4640 |
| M6 | 45 mm | ≈ 10 g | NVS7991A4645 |
| M6 | 50 mm | ≈ 11 g | NVS7991A4650 |
| M6 | 60 mm | ≈ 13 g | NVS7991A4660 |
| M6 | 70 mm | ≈ 16 g | NVS7991A4670 |
| M6 | 80 mm | ≈ 18 g | NVS7991A4680 |
| M8 | 10 mm | ≈ 5.6 g | NVS7991A4810 |
| M8 | 12 mm | ≈ 6.2 g | NVS7991A4812 |
| M8 | 16 mm | ≈ 7.5 g | NVS7991A4816 |
| M8 | 20 mm | ≈ 8.7 g | NVS7991A4820 |
| M8 | 25 mm | ≈ 10 g | NVS7991A4825 |
| M8 | 30 mm | ≈ 12 g | NVS7991A4830 |
| M8 | 35 mm | ≈ 14 g | NVS7991A4835 |
| M8 | 40 mm | ≈ 15 g | NVS7991A4840 |
| M8 | 45 mm | ≈ 17 g | NVS7991A4845 |
| M8 | 50 mm | ≈ 20 g | NVS7991A4850 |
| M8 | 60 mm | ≈ 25 g | NVS7991A4860 |
| M8 | 70 mm | ≈ 30 g | NVS7991A4870 |
| M8 | 80 mm | ≈ 35 g | NVS7991A4880 |
| M8 | 90 mm | ≈ 40 g | NVS7991A4890 |
| M8 | 100 mm | ≈ 45 g | NVS7991A48100 |
| M10 | 25 mm | ≈ 17 g | NVS7991A41025 |
| M10 | 30 mm | ≈ 19 g | NVS7991A41030 |
| M10 | 35 mm | ≈ 22 g | NVS7991A41035 |
| M10 | 40 mm | ≈ 24 g | NVS7991A41040 |
| M10 | 45 mm | ≈ 28 g | NVS7991A41045 |
| M10 | 50 mm | ≈ 31 g | NVS7991A41050 |
| M10 | 60 mm | ≈ 36 g | NVS7991A41060 |
| M10 | 70 mm | ≈ 42 g | NVS7991A41070 |
| M10 | 80 mm | ≈ 48 g | NVS7991A41080 |
| M10 | 90 mm | ≈ 53 g | NVS7991A41090 |
| M10 | 100 mm | ≈ 59 g | NVS7991A410100 |
| M12 | 20 mm | ≈ 22 g | NVS7991A41220 |
| M12 | 25 mm | ≈ 25 g | NVS7991A41225 |
| M12 | 30 mm | ≈ 29 g | NVS7991A41230 |
| M12 | 35 mm | ≈ 33 g | NVS7991A41235 |
| M12 | 40 mm | ≈ 36 g | NVS7991A41240 |
| M12 | 45 mm | ≈ 40 g | NVS7991A41245 |
| M12 | 50 mm | ≈ 44 g | NVS7991A41250 |
| M12 | 60 mm | ≈ 55 g | NVS7991A41260 |
| M12 | 70 mm | ≈ 64 g | NVS7991A41270 |
| M12 | 80 mm | ≈ 73 g | NVS7991A41280 |
| M12 | 90 mm | ≈ 82 g | NVS7991A41290 |
| M12 | 100 mm | ≈ 91 g | NVS7991A412100 |
| M16 | 40 mm | ≈ 66 g | NVS7991A41640 |
| M16 | 50 mm | ≈ 80 g | NVS7991A41650 |
| M16 | 60 mm | ≈ 93 g | NVS7991A41660 |
| M16 | 70 mm | ≈ 113 g | NVS7991A41670 |
| M16 | 80 mm | ≈ 129 g | NVS7991A41680 |
| M16 | 90 mm | ≈ 145 g | NVS7991A41690 |
| M16 | 100 mm | ≈ 162 g | NVS7991A416100 |
| M20 | 40 mm | ≈ 104 g | NVS7991A42040 |
| M20 | 50 mm | ≈ 125 g | NVS7991A42050 |
| M20 | 60 mm | ≈ 145 g | NVS7991A42060 |
| M20 | 70 mm | ≈ 167 g | NVS7991A42070 |
| M20 | 80 mm | ≈ 203 g | NVS7991A42080 |
| M20 | 90 mm | ≈ 230 g | NVS7991A42090 |
| M20 | 100 mm | ≈ 257 g | NVS7991A420100 |
Dimensions are in millimeters. Weights are approximate unit weights; values marked “≈” are theoretical, calculated from standard dimensions. Minor variations between production batches are possible.
Technical specifications
| Specification | Value |
|---|---|
| Material | AISI 316 stainless steel |
| Material number | 1.4401 · X5CrNiMo17-12-2 |
| Design | Countersunk head, hexagon socket drive, metric thread |
| Standard | DIN 7991 · ISO 10642 |
| Property class | A4-70 (ISO 3506-1) |
| Head type | Countersunk head, hexagon socket |
| Thread | Metric thread |
| Size range | M3–M20 · 10–100 mm |
| Number of sizes | 90 |
| Brand | NVS |
Selection and installation notes
- The countersink in the hole must have the right angle and depth for the screw head; if it is too shallow, the head stands proud of the surface, and if it is too deep, the seating is weakened.
- Stainless steel threads can gall (cold weld); lubricate the thread and tighten at low speed.
- A4 (316) is the right choice in sea water, chlorine and acidic environments; for fresh water and indoor use, A2 (304) is more economical.
- Direct contact between stainless steel and galvanized or carbon steel can cause galvanic corrosion; use insulation (washers, unions) between different metals.
For size selection, project lists and volume pricing, contact Novus Energy on WhatsApp +90 555 005 99 84 or at bilgi@novus.tr.
This item is also available in AISI 304 grade. See the full range in Stainless Steel Bolts.
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