Self-Clinching & Weld Fasteners

Self-Clinch Locking Nuts

Hex-shaped clinch nuts with all-metal locking, M2.5 to M5.

Section: Self-clinching
Type: Nuts

Overview

Self-clinch locking nuts have an all-metal locking thread that resists vibration loosening, in a compact hex form.

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-LK, SG-LKS
Zinc Plated Steel	SG-LK
Stainless Steel	SG-LKS
Sizes	M2.5, M3, M4, M5
Sheet hardness (SG-LK/LKS)	HRB 70 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	M2.5		M3		M4		M5
Shank code	1	2	1	2	1	2	1	2
A shank max.	0.97	1.38	0.97	1.38	0.97	1.38	0.97	1.38
Min. sheet thickness	1.0	1.4	1.0	1.4	1.0	1.4	1.0	1.4
Recommended hole size +0.08	4.37		4.75		6.76		7.92
C max.	4.35		4.73		6.73		7.90
D max.	4.45		4.85		6.20		7.40
S nom.	6.35		6.35		8.73		9.53
H ±0.25	3.43		3.43		4.45		5.21
Min. distance to edge of sheet	3.90		4.00		5.20		5.60

Preferred range

Shank code	M2.5	M3	M4	M5
1	•	•	•	•
2	•	•	•	•

Performance data: SG-LK / SG-LKS

Thread	M2.5		M3		M4		M5
Shank code	1	2	1	2	1	2	1	2
Installation (kN) – aluminium	7.1	8.9	7.1	8.9	12.0	13.3	14.2	14.2
Installation (kN) – steel	13.3	13.3	13.3	13.3	17.8	19.1	17.8	19.1
Pushout (N) – aluminium	578	667	578	890	667	1112	667	1112
Pushout (N) – steel	667	711	667	1112	845	1334	1112	1334