BSL® welding studs, also known as welding bolts, can provide external thread support for automotive steel sheet metal threaded fastening connections, and use welding to improve connection strength.
Suitable for high-strength connections of thicker automotive sheet metal parts, such as connections between automotive chassis and seats.
Usage scenarios
BSL® welding studs are available in auto standard parts and customized types.
For the structural dimensions of auto standard parts welding nuts, please refer to the relevant contents of the bearing surface projection welding bolts (Q198A, Q198B, Q198C types) and end projection welding bolts (Q199A, Q199B types) in the “Automobile Standard Parts Manual 2012 Edition”.
size
| Nominal diameter d | M4 | M5 | M6 | M8 | M10 | M12 | |
| P | Pitch | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 |
| d₁ | Maximum | 11.5 | 12.5 | 14.5 | 19 | 21 | 24 |
| Minimum | 11.23 | 12.23 | 14.23 | 18.67 | 20.67 | 23.67 | |
| k | Maximum | 2 | 2.5 | 2.5 | 3.5 | 4 | 5 |
| Minimum | 1.75 | 2.25 | 2.25 | 3.25 | 3.75 | 4.75 | |
| d₂ | Maximum | 8.75 | 9.75 | 10.75 | 14.25 | 16.25 | 18.75 |
| Minimum | 8.5 | 9.5 | 10.5 | 14 | 16 | 18.5 | |
| h | Maximum | 1.25 | 1.25 | 1.25 | 1.45 | 1.45 | 1.65 |
| Minimum | 0.9 | 0.9 | 0.9 | 1.1 | 1.1 | 1.3 | |
| d₃ | Maximum | 2.6 | 2.6 | 2.6 | 3.1 | 3.1 | 3.6 |
| Minimum | 2.4 | 2.4 | 2.4 | 2.9 | 2.9 | 3.4 | |
| r | Minimum | 0.2 | 0.2 | 0.3 | 0.3 | 0.4 | 0.4 |
| r1 | Maximum | 0.7 | 0.7 | 0.7 | 1 | 1 | 1 |
| a | Maximum | 1.95 | 2.05 | 2.25 | 2.7 | 2.95 | 3.4 |
| L | |||||||
| ①, The height difference of the three convex welds of the same bolt is ≤0.15mm, and the shapes of the three convex welds should be the same. | |||||||
Performance Table
| Thread specification d
（mm） |
5.8 | |
| Thread load (N) Min
|
Minimum tensile load (N) | |
| M4 | 3340 | 4570 |
| M5 | 5400 | 7380 |
| M6 | 7640 | 10400 |
| M8 | 13900 | 19000 |
| M10 | 22000 | 30200 |
| M12 | 32000 | 43800 |
Surface treatment
The recommended material grades and protection types for welding studs are as follows:
| Product Type | Material grade | Material Standards | Connection strength | Surface treatment and protection level |
| Bearing surface projection welding bolt
Q198A/Q198C |
SWCH8A
SWCH10A |
JIS G3507-1 | 5.8class | Natural oil immersion; black oil immersion |
| Bearing surface projection welding bolt
Q198B |
SWCH10A
10B21 |
SAE J403 | 5.8/8.8class | Natural oil-immersion; Black oil-immersion; Galvanized |
Natural oil-immersion; Black oil-immersion; Galvanized
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