GB\/T 5280-2002 specifies the thread dimensions and end types for self-tapping screws (sheet metal screws) with thread sizes ranging from ST1.5 to ST9.5. This standard ensures uniformity in manufacturing, facilitating reliable fastening in materials like metal sheets without pre-drilled holes.<\/p>\n
As a key reference in mechanical fastening, it defines parameters such as pitch, major and minor diameters, and thread lengths for types C, F, and R, promoting compatibility and performance in industries including automotive, electronics, and construction. It aligns with international practices while addressing specific requirements for Chinese standards.<\/p>\n
The standard outlines thread geometry, including major diameter (d1), pitch diameter (d2), minor diameter (d3), chamfer (c), radius (r), and reference lengths (y) for different end types. These ensure proper thread formation and engagement, minimizing material damage during installation.<\/p>\n
Key parameters include pitch varying from 0.5 mm for ST1.5 to 2.1 mm for larger sizes, with tolerances for max\/min values to accommodate manufacturing variations. Type C for pointy ends, F for blunt, and R for rounded, each suited to specific material thicknesses.<\/p>\n
Below is the comprehensive table of thread dimensions as per GB\/T 5280-2002, providing precise values for engineering reference. Use this for design verification and production specifications.<\/p>\n
| Parameter<\/th>\n | ST1.5<\/th>\n | ST1.9<\/th>\n | ST2.2<\/th>\n | ST2.6<\/th>\n | ST2.9<\/th>\n | ST3.3<\/th>\n | ST3.5<\/th>\n | ST3.9<\/th>\n | ST4.2<\/th>\n | ST4.8<\/th>\n | ST5.5<\/th>\n | ST6.3<\/th>\n | ST8<\/th>\n | ST9.5<\/th>\n<\/tr>\n<\/thead>\n |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Toonhoogte<\/td>\n | 0.5<\/td>\n | 0.6<\/td>\n | 0.8<\/td>\n | 0.9<\/td>\n | 1.1<\/td>\n | 1.3<\/td>\n | 1.3<\/td>\n | 1.3<\/td>\n | 1.4<\/td>\n | 1.6<\/td>\n | 1.8<\/td>\n | 1.8<\/td>\n | 2.1<\/td>\n | 2.1<\/td>\n<\/tr>\n |
| d1 max<\/td>\n | 1.52<\/td>\n | 1.9<\/td>\n | 2.24<\/td>\n | 2.57<\/td>\n | 2.9<\/td>\n | 3.3<\/td>\n | 3.53<\/td>\n | 3.91<\/td>\n | 4.22<\/td>\n | 4.8<\/td>\n | 5.46<\/td>\n | 6.25<\/td>\n | 8<\/td>\n | 9.65<\/td>\n<\/tr>\n |
| d1 min<\/td>\n | 1.38<\/td>\n | 1.76<\/td>\n | 2.1<\/td>\n | 2.43<\/td>\n | 2.76<\/td>\n | 3.12<\/td>\n | 3.35<\/td>\n | 3.73<\/td>\n | 4.04<\/td>\n | 4.62<\/td>\n | 5.28<\/td>\n | 6.03<\/td>\n | 7.78<\/td>\n | 9.43<\/td>\n<\/tr>\n |
| d2 max<\/td>\n | 0.91<\/td>\n | 1.24<\/td>\n | 1.63<\/td>\n | 1.9<\/td>\n | 2.18<\/td>\n | 2.39<\/td>\n | 2.64<\/td>\n | 2.92<\/td>\n | 3.1<\/td>\n | 3.58<\/td>\n | 4.17<\/td>\n | 4.88<\/td>\n | 6.2<\/td>\n | 7.85<\/td>\n<\/tr>\n |
| d2 min<\/td>\n | 0.84<\/td>\n | 1.17<\/td>\n | 1.52<\/td>\n | 1.8<\/td>\n | 2.08<\/td>\n | 2.29<\/td>\n | 2.51<\/td>\n | 2.77<\/td>\n | 2.95<\/td>\n | 3.43<\/td>\n | 3.99<\/td>\n | 4.7<\/td>\n | 5.99<\/td>\n | 7.59<\/td>\n<\/tr>\n |
| d3 max<\/td>\n | 0.79<\/td>\n | 1.12<\/td>\n | 1.47<\/td>\n | 1.73<\/td>\n | 2.01<\/td>\n | 2.21<\/td>\n | 2.41<\/td>\n | 2.67<\/td>\n | 2.84<\/td>\n | 3.3<\/td>\n | 3.86<\/td>\n | 4.55<\/td>\n | 5.84<\/td>\n | 7.44<\/td>\n<\/tr>\n |
| d3 min<\/td>\n | 0.69<\/td>\n | 1.02<\/td>\n | 1.37<\/td>\n | 1.6<\/td>\n | 1.88<\/td>\n | 2.08<\/td>\n | 2.26<\/td>\n | 2.51<\/td>\n | 2.69<\/td>\n | 3.12<\/td>\n | 3.68<\/td>\n | 4.34<\/td>\n | 5.64<\/td>\n | 7.24<\/td>\n<\/tr>\n |
| c max<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.1<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n | 0.15<\/td>\n<\/tr>\n |
| r \u2248<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | 0.5<\/td>\n | 0.6<\/td>\n | 0.6<\/td>\n | 0.7<\/td>\n | 0.8<\/td>\n | 0.9<\/td>\n | 1.1<\/td>\n | 1.4<\/td>\n<\/tr>\n |
| y Type C<\/td>\n | 1.4<\/td>\n | 1.6<\/td>\n | 2<\/td>\n | 2.3<\/td>\n | 2.6<\/td>\n | 3<\/td>\n | 3.2<\/td>\n | 3.5<\/td>\n | 3.7<\/td>\n | 4.3<\/td>\n | 5<\/td>\n | 6<\/td>\n | 7.5<\/td>\n | 8<\/td>\n<\/tr>\n |
| y Type F<\/td>\n | 1.1<\/td>\n | 1.2<\/td>\n | 1.6<\/td>\n | 1.8<\/td>\n | 2.1<\/td>\n | 2.5<\/td>\n | 2.5<\/td>\n | 2.7<\/td>\n | 2.8<\/td>\n | 3.2<\/td>\n | 3.6<\/td>\n | 3.6<\/td>\n | 4.2<\/td>\n | 4.2<\/td>\n<\/tr>\n |
| y Type R<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | –<\/td>\n | 2.7<\/td>\n | 3<\/td>\n | 3.2<\/td>\n | 3.6<\/td>\n | 4.3<\/td>\n | 5<\/td>\n | 6.3<\/td>\n | –<\/td>\n<\/tr>\n |
| Nummer<\/td>\n | 0<\/td>\n | 1<\/td>\n | 2<\/td>\n | 3<\/td>\n | 4<\/td>\n | 5<\/td>\n | 6<\/td>\n | 7<\/td>\n | 8<\/td>\n | 10<\/td>\n | 12<\/td>\n | 14<\/td>\n | 16<\/td>\n | 20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Dimensions are in mm. Select sizes based on material thickness and load requirements for optimal performance.<\/p>\n Application Guidelines and Considerations<\/h2>\nWhen applying GB\/T 5280-2002, match thread size to substrate material; smaller pitches like 0.5 mm suit thin sheets, while larger like 2.1 mm handle thicker materials. Ensure proper pilot hole sizes to avoid cracking.<\/p>\n
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