During clinching processing of sheet metal factories and automation supporting enterprises, four mass defects frequently appear: nut spinning caused by oversized pilot hole, plate tearing by undersized hole, insufficient tooth engagement with low press tonnage and surface dent from over high tonnage. Yamaoluomu summarizes standard pilot hole sizes for mainstream M2~M8 thread specs covering all industries, matches press tonnage corresponding to sheet thickness, and adapts small batch manual work, medium batch pneumatic production lines and mass full-automatic hydraulic assembly lines to unify standardized sheet metal clinching workflow.
| Thread Size | S Carbon Steel Series Hole(mm) | CLS SUS304 Stainless Hole(mm) | SP Stainless Iron Series Hole(mm) | Min Matching Sheet Thickness(mm) |
| M2 | 4.2 | 4.2 | 4.3 | 0.8 |
| M2.5 | 4.7 | 4.7 | 4.8 | 0.8 |
| M3 | 5.4 | 5.4 | 5.5 | 1.0 |
| M4 | 6.5 | 6.5 | 6.6 | 1.2 |
| M5 | 8.0 | 8.0 | 8.1 | 1.5 |
| M6 | 9.6 | 9.6 | 9.7 | 1.8 |
| M8 | 12.2 | 12.2 | 12.3 | 2.0 |
| Sheet Thickness | Recommended Press Tonnage | Matching Equipment Type | Applicable Production Mode |
| 0.5~1.0mm Ultra-thin Sheet | 0.5~1 Ton | Small Manual / Pneumatic Clincher | Prototype sampling, small batch sample processing, maintenance re-clinching |
| 1.0~2.0mm Regular Thin Sheet | 1~3 Ton | Standard Pneumatic Clinching Machine | Medium & small sheet metal factory mass processing, semi-automatic single machine production line |
| 2.0~4.0mm Thick Aluminum / Steel Plate | 3~6 Ton | Fully Automatic Hydraulic Clincher | Mass continuous production lines for new energy & rail transit |
| Over 4.0mm Thick Sheet Metal | 6~10 Ton Heavy Hydraulic Press | Floor-standing Heavy Duty Hydraulic Clincher | Heavy equipment chassis, large energy storage cabinet thick plate structure |
1. Punch tolerance control: All pilot holes adopt positive tolerance +0.02~+0.05mm, negative tolerance is forbidden; undersized hole will directly tear sheet metal; 2. Sheet pre-treatment: Remove burrs around punched holes, unremoved burrs lead to tilted nuts and eccentric threads after clinching; 3. Pressing speed rule: Press ultra-thin sheets at low speed, single pressing stroke over 0.5s, high-speed impact easily causes surface dent; 4. Material matching adjustment: Enlarge pilot hole by 0.05mm for aluminum sheets and reduce press tonnage by 20% to avoid excessive plastic deformation of aluminum alloy; 5. First article inspection per batch: Pull-out force test 3 nuts for each sheet batch, mass production only allowed after passing pull test standard.
Small sheet metal sampling & repair shops: 0.8 ton desktop manual pneumatic clincher, low investment cost, flexible spec switching; Medium industrial control & home appliance sheet metal factories: 2 ton standard pneumatic clincher, compatible M2-M6 mainstream sizes, daily output 3000~8000 pcs; Mass automatic production lines for new energy vehicles & 5G cabinets: 5 ton servo hydraulic full-automatic clincher with auto feeding mechanism, stable 24-hour continuous operation; Heavy energy storage thick plate cabinet manufacturers: 8 ton heavy floor hydraulic clincher, suitable for M6-M8 large spec thick plate clinching work.
Contact: Mr. Deng
Phone: 13928071304
Tel: 0756-8586520
Email: lizhong@zhjiali.com
Add: 102, Building 4, No. 4 Fuyuan Road, Waisha Village, Shenwan Town, Zhongshan City, Guangdong Province,China