DIN 7500 Trilobular thread-forming system
“DIN7500 is an ISO metric thread forming screw for a great number of applications, optimal in-place costs and joint performance.
Content How it works and Advantages 4 Advantages 5 Materials, Corrosion Protection, Assembly, Technical Support 9 Product Overview 10 3
The Thread-Forming Screw The Thread Thread-forming screws according DIN 7500can be driven into malleable materials without the need for tapping the mating thread.
Simple - Reliable - Fast Dril pilot hole No need for taping Drive screw in Tighten screw Advantages Thread forming screws form their mating threads eliminating the need for tapping. The thread formed is a regular thread (metric or inch), meaning, thread-forming screws can be replaced with conventional screws. Naturally, thread-forming screws may be used in tapped holes as well. Thus, the product range can be optimised.
Simple, Reliable, Fast The Trilobular Screw Thread The trilobular thread shape facilitates thread forming. The tapered point eases thread engaging and initial thread forming. The maximum taper length equals 4 thread pitches (max. 4xP). The tapered portion of the thread can not be fully loaded, which must be taken into account, when screw length is determined. A Tapered screw point max.
Application Guidelines Thread-forming displaces material, thus a small bulge is produced at the hole’s entrance. This may prevent parts from being tightly fastened. A 90º chamfer, with a depth of 0.5 to 1 x the thread pitch, will avert that. A shallow relief bore will do the same. By putting a relief bore at the entrance of the pilot hole, the thread engagement of the individual assembled parts can be kept constant.
Technical Support and Testing Whether a certain type of thread-forming screw is suitable for a given malleable material (steel, aluminum or non-ferrous metal) should be tested and evaluated through application testing. Bossard engineers carry out application testing to assess thread forming screws, sizes M2.5 to M8, for specifi c customer applications.
Information Concerning Pilot Data Holes Thread-forming screws can be installed in blind holes as well as through holes. Type and strength of material of the mating components, hole geometry and size, and engagement length are decisive for a proper installation. That information can be found in the tables to the left. Nominal diameter Data Thread pitch (mm) Tightening torque max. M2 M2,5 M3 M3,5 M4 M5 M6 M8 0,4 0,45 0,5 0,6 0,7 0,8 1 1,25 ca.
PRODUCT OVERVIEW The Thread-Forming Screw DIN 7500 Thread-Forming Screw Head DIN 7985 with Pozidriv cross recessed pan 1 BN 2724 | Case hardened, zinc plated, waxed 1 BN 4908 | INOX A2, waxed d1 d1 M2,5 d2 max. k max.
Hexalobular pan head thread forming screws ~Form C Head ISO 14583 1 BN 5653 | INOX A2, waxed d1 d1 L M2,5 M3 M4 M5 4 1 5 1 1 6 1 1 1 8 1 1 1 1 10 1 1 1 1 12 1 M6 1 M2,5 M3 M4 M5 M6 1 1 1 1 d2 max. 5 5,6 8 9,5 12 16 1 1 1 1 k max. 2,1 2,4 3,1 3,7 4,6 c 20 1 1 1 1 X8 X10 X20 X25 X30 25 1 1 1 t max.
Thread forming screws with Pozidriv cross recessed flat head with metric thread 1 BN 3327 | case hardened, zinc plated, waxed 1 BN 4919 | INOX A2, waxed d1 d1 M2,5 M3 M4 M5 M6 d2 max. 4,7 5,6 7,5 9,2 11 k max. 1,5 1,65 2,2 2,5 3 d 1 1 2 2 3 m~ 2,5 2,8 4 4,4 6,1 min. 1,22 1,48 1,6 2,05 2,46 max.
Hexalobular flat head thread forming screws with metric thread 1 BN 13278 | INOX A2, waxed d1 L d1 M2,5 M3 M4 M5 M6 5 1 6 1 1 8 1 1 1 10 1 1 1 1 1 12 1 1 1 1 1 M2,5 M3 M4 M5 M6 16 1 1 1 1 d2 max. 4,7 5,5 8,4 9,3 11,3 20 1 1 1 1 k max. 1,5 1,65 2,7 2,7 3,3 c 25 1 1 1 1 X8 X10 X20 X25 X30 30 1 1 1 t max.
Hexalobular pan head thread forming screws with ribs and metric thread 1 BN 14551 | Case-hardened zinc plated, waxed d1 L d1 M3 M4 d2 max. 6 8 k max. 2,52 3,25 n t max. 0,6 1 X10 x20 1,2 1,9 M3 5 1 6 1 8 1 1 1 12 1 16 1. 2. 1. Thread-forming grounding screws 2. Cost-savings example of light fixture assembly Subject to change without notice. Please refer to your local Bossard E-Shop for the current assortment and dimensions. Other variants upon request.
PROVEN PRODUCTIVITY – A PROMISE TO OUR CUSTOMERS The strategy for success no v ology Techn Hi ark iability rt Smart Fa cto Better Throughput bly et From years of cooperation with our customers we know what achieves proven and sustainable impact. We have identified what it takes to streng then the competitiveness of our customers. There fore we support our customers in three strategic core areas.
© Bossard / DIN 7500 / en / 07-09 / Subject to change without notice. www.bossard.
