1. Through hole: SO-M3-8-ZI

a. The materials are divided into: steel SO stainless steel SOS.

b. SO-3.5M3-8-ZC (3.5 represents a bottom hole of 5.4mm, with a C value of 5.38mm).

    SO-M3-8-ZC (bottom hole is 4.2mm, C value is 4.) 19MM).

    SO-M4-8-ZC (Bottom hole is 6.0, C value is 5.95mm).

    SO-3.5M4-8-ZC (bottom hole is 7.2, C value is 7 11MM).

2. Blind hole: BSO-M3-8-ZC

a. The materials are divided into: steel - BSO stainless steel - BSOS.

b. BSO-3.5M3-8-ZC (3.5 represents a bottom hole of 5.4MM, with a C value of 5.38mm).

    BSO-M3-8-ZC (bottom hole is 4.2mm, C value is 4 19MM).

    BSO-M4-8-ZC (Bottom hole is 6.0, C value is 5.95mm).

    BSO-3.5M4-8-ZC (bottom hole is 7.2, C value is 7 11MM).

1. Unobstructed.

2. The material is carbon steel (ordinary steel).

3. The thread specification is M3.

4. The bottom hole of the screw riveting is Ø 5.4.

5. Height is 8mm.

6. Surface treatment with white zinc plated rivet bolts.

3. British standard rivet bolts: such as SO-632-12-ZC

L=12 × 1/32 × 25.4=9.5mm

L=(length code × 1/32 × 25.4) mm

4. Note: in general, rivet bolts with SO, SOO, SOS, and SOOS codes are all processed into full thread bolts by default, unless otherwise specified in the engineering data.

Stud type: SO represents ordinary steel through-hole bolts,

                 SOS stands for stainless steel through-hole bolts,

                 SOA represents aluminum through-hole bolts

                 BSO stands for ordinary steel blind hole bolts,

                 BSOS stands for stainless steel blind hole bolts,

                 BSOA stands for aluminum blind hole bolts

                 SOO stands for ordinary steel through-hole threaded bolts,

                 SOOS stands for stainless steel through-hole threaded bolts,

                 SOOA stands for aluminum through-hole threaded bolts.

The difference between screw 3.5M3 and M3: Both are teeth of M3, but the wall thickness of 3.5M3 is larger than that of M3, which means the bottom hole is different.

The difference between screw 6440 and 440 is that the wall thickness of 6440 is larger than that of 440. The bottom hole of 6440 is 5.4, while the bottom hole of 440 is 4.2.