Inserts
BSL® inserts are a type of rod with knurling or groove structure that can be embedded in plastic or other alloy products (mainly used in plastic products) to form an integrated connection product between the threaded part and the base material. Generally, the parts are embedded by die casting or injection molding of the molten base material to provide a threaded fastening connection or positioning reference hole for the base material.
Inserts are mainly used in battery pack assemblies for new energy vehicles.
| Product Type/Code［1］ | Performance level | page number | Typical application scenarios | Product specifications/installation materials/installation thickness | |
| No.1 | Light hole insert
B5030 |
— | Battery Pack | φ6.5，Cast aluminum/plastic，6mm | |
| No.2 | Insert stud
B5031 |
— | Battery Pack | M5–M8，Cast aluminum/plastic，5.5-11.5mm | |
| No.2 | Insert nut
B5032 |
— | Battery Pack | M3–M8，Cast aluminum/plastic，8-25mm | |
00001 Note: For product coding rules, please refer to “Q/HBS GF001-2025 Bosch Enterprise Product Coding Rules”
Table 1 Mechanical properties (steel-threaded inserts)
| Nominal thread diameter of steel inserts | M5 | M6 | M8 |
| Parts thread protection KN | 12.14 | 17.2 | 31.8 |
| Minimum breaking torqueNm | 8 | 15 | 30 |
| Surface hardness HV | 200-302 | ||
| Thread friction coefficient | 0.12–0.18 | ||
| Neutral salt spray test | 720H neutral salt spray test, no red rust | ||
| Coating test | Coating thickness：5ummin ；Nickel content：12-16% | ||
Table 2 Mechanical properties (copper-threaded insert)
| Nominal thread diameter of steel inserts | M3 | M4 | M5 | M6 | M8 |
| Nominal thread diameter of steel inserts KN | 2.21 | 3.86 | 6.25 | 8.84 | 13.54 |
| Minimum breaking torque Nm | 2 | 4 | 8 | 15 | 30 |
| Surface hardness HV | ≥120 | ||||
| Thread friction coefficient | 0.12–0.18 | ||||
Insert materials, surface treatment types, and product functions are as follows:
| type | Material | Surface treatment | Product Features |
| Light hole insert
B5030 |
copper：C3604 | Natural Polished | Provide assembly positioning base holes |
| Insert stud
B5031 |
copper：C3604 | Natural Polished | Provide external thread support connection |
| Insert nut
B5032 |
copper：C3604 | Natural Polished | Provide internal thread support connection |
| steel：1144，45# | 锌镍合金 |
The insert and the plastic part are integrated by die casting or injection molding. The specific die casting or injection molding method is determined by the customer.
