Self-Clinching & Weld Fasteners

Blind Standoffs

Closed-end threaded spacers, sealed on one side.

Section: Self-clinching
Type: Standoffs

Overview

Blind standoffs are closed at one end, so the screw cannot pass through and the panel stays sealed. They press into thin sheet and hold boards or parts at a fixed height.

Full dimensions, preferred lengths and installation / push-out / torque-out performance data are in the tables below, taken from the self-clinching fasteners catalogue.

Specifications

Part numbers	SG-BSO, SG-BSOS, SG-BSO4, SG-BSOA
Zinc Plated Steel	SG-BSO
Stainless Steel	SG-BSOS
400 Series Stainless Steel	SG-BSO4
Aluminium	SG-BSOA
Sizes	M2, M2.5, M3, M3.5, M4, M5
Sheet hardness (SG-BSOA)	HRB 50 or less

Dimensions & performance data

All dimensions in mm unless stated. Values from the self-clinching fasteners catalogue. Install into sheet within the hardness limits shown in the specifications.

Dimensions (mm)

Thread	M2, M2.5, M3	M3 alt	M4	M5
C -0.13	4.2	5.39	7.12	7.12
A nom.	4.8	6.4	7.9	7.9
Min. sheet thickness	1.0	1.0	1.27	1.27
Recommended hole size +0.08	4.22	5.41	7.14	7.14
Min. distance to edge of sheet	6.0	6.8	8.0	8.0

Lengths L (+0.05/-0.13) and minimum thread depth B (mm)

Length L	5	6	7	8	10	12	14	15	16	18	20	22	25
Thread depth B min.	2.8	3.2	3.6	4.0		5.0	6.5			9.5

Performance data: SG-BSO / SG-BSOS (test sheet: steel, 1.5 mm)

Thread	M2, M2.5, M3	M3 alt	M3.5, M4	M5
Installation (kN), steel and stainless	9.9	14.8	17.9	17.9
Torsional resistance (Nm), steel and stainless	2.16	3.95	8.5	8.5
Pushout (N), steel and stainless	1050	1870	2500	2500
Pull-through (N) – steel	1470	1470	3180	3180
Pull-through (N) – stainless	1180	1180	2490	2490
Max. torque for mating screw (Nm) – steel	0.56	0.56	2.1	3.7
Max. torque for mating screw (Nm) – stainless	0.45	0.45	1.7	2.9