BSL® welding nuts can provide internal thread support for automotive steel sheet metal, and improve the connection strength by welding.
Suitable for high-strength connection of thicker automotive sheet metal parts, such as automotive door frame parts.
About welding nuts
BSL® welding nuts are divided into automotive standard parts and customized types.
For the structural dimensions of automotive standard parts welding nuts, please refer to the relevant contents of welding nuts (Q364, Q366, Q368, Q369, Q370D, Q371B or Q375) in the “Automotive Standard Parts Manual 2012 Edition”.
Bosch’s customized welding nuts include: trimmed welding nuts (safety belt nuts), cap-type welding nuts, etc.
| Product Type/Code［1］ | Material | page number | Typical application scenarios | Product specifications/installation materials/installation thickness | |
| No.1 | Square weld nut
Q371 Q371B |
SWCH15A | Body sheet metal | M5/M6/M8，steel，1.5-3mmBody sheet metal | |
| No.2 | Hexagonal flange weld nuts
Q364 |
10B21 | Body sheet metal | M10/M12,钢，2-4mm | |
| No.3 | Cut edge weld nut
B3021-Q |
SWCH8A | seat belt | M6/M8/M10
7/16”,steel，2-4mm |
|
| No.4 | Cap type weld nut
B3021-G |
10B21 | Body sheet metal | M10，steel，2-3mm | |
00001 Note: For product coding rules, please refer to “Q/HBS GF001-2023 Bosch Enterprise Product Coding Rules”
| Product Code | Thread specification d |
e | h | h₁ | m | S | b | b₁ | d₃ | da | Guaranteed load N | ||||||||
| Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | |||
| Q37105 | M5 | 9.93 | 0.9 | 0.7 | 1 | 0.8 | 4.2 | 3.9 | 8 | 7.64 | 1 | 0.7 | 1.5 | 0.3 | 6.18 | 6 | 5.75 | 5 | 11000 |
| Q37106 | M6 | 12.53 | 0.9 | 0.7 | 1 | 0.8 | 5 | 4.7 | 10 | 9.64 | 1.2 | 0.9 | 1.5 | 0.3 | 7.72 | 7.5 | 6.75 | 6 | 15500 |
| Q37108 | M8 | 16.34 | 1.1 | 0.9 | 1 | 0.8 | 6.5 | 6.14 | 13 | 12.57 | 1.5 | 1.2 | 1.5 | 0.3 | 10.22 | 10 | 8.75 | 8 | 28300 |
| Q37110 | M10 | 20.24 | 1.3 | 1.1 | 1 | 0.8 | 8 | 7.64 | 16 | 15.57 | 1.8 | 1.4 | 1.5 | 0.3 | 12.77 | 12.5 | 10.8 | 10 | 44800 |
| Q37112 | M12 | 22.84 | 1.5 | 1.3 | 1.2 | 1 | 9.5 | 9.14 | 18 | 17.57 | 2 | 1.6 | 2 | 0.5 | 13.77 | 13.5 | 13 | 12 | 65300 |
Note 1: The code refers to the QC/T 326-2013 code of the automobile standard; for dimensions not listed, please refer to QC/T 863-2011.
The recommended material grades and protection types for weld nuts are as follows:
| Product Type | Material grade | Material Standards | Connection strength | Surface treatment and protection level |
| Square weld nut | SWCH15A
SWCH22A |
JIS G3507-1
SAE J403 |
8class | Natural oil immersion; black oil immersion |
| SWCH8A
10B21 |
6class | |||
| Welded hexagonal flange nuts | 10B21 | SAE J403 | 10class | |
| Cut edge weld nut | SWCH8A | JIS G3507-1 | — | |
| 40Cr | GB/T 3077 | 10class | ||
| Cap type weld nut | 10B21 | SAE J403 | 10class |
Welding nuts are welded with a special welding gun. The welding tools are determined by the user.
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