Nut DIN 6331

Name: Nut DIN 6331
Brand: SPD Italy

S351 Shoulder Nut DIN 6331 – Stable, Strong Connection with High Durability

The S351 shoulder nut per DIN 6331, from SPD Italy, provides a professional and stable connection. The built-in shoulder replaces a separate washer and spreads the clamping force over a larger area. Made of tempered free-machining steel (Automatic Alloy Steel), it is intended for industrial applications that require high durability and excellent clamping strength. Available in 14 sizes, from M8 to M48.

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Key Advantages:

Built-in shoulder – replaces a washer and distributes the clamping load
Height 1.5×d – high stability and thread strength
Ideal for clamping clamps with T-bolts and threaded studs
Standard: DIN 6331
Inspection certificate 2.2 available on request
Made by SPD Italy – proven quality and reliability

Technical Specifications:

Product model: S351
Standard: DIN 6331
Material: Tempered free-machining steel (Automatic Alloy Steel)
Type: Hex nut with shoulder (Nut with washer)
Manufacturer: SPD Italy

Technical Drawing:

Dimensions Table (mm):

Model	M (Thread)	S (Wrench size)	E	H	A	D	Weight (g)
S351.00008	M8	13	14.8	12	3.5	18	12
S351.00010	M10	17	19.6	15	4	22	21
S351.00012	M12	19	21.5	18	4	25	36
S351.00014	M14	22	25	21	4.5	28	51
S351.00016	M16	24	27.5	24	5	31	70
S351.00018	M18	27	31	27	5	34	95
S351.00020	M20	30	34.6	30	6	37	130
S351.00022	M22	32	36.9	33	6	40	160
S351.00024	M24	36	41.6	36	6	45	230
S351.00027	M27	41	47.3	40	8	51	320
S351.00030	M30	46	53.1	45	8	58	470
S351.00036	M36	55	63.5	54	10	68	800
S351.00042	M42	65	75	63	12	80	1340
S351.00048	M48	75	86.5	72	14	92	2040

Legend: M – thread diameter, S – wrench size (across flats), E – diameter across corners, H – total height, A – shoulder thickness, D – shoulder diameter. Additional sizes available on request.

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