ASME B18.13.1M Rounded Head Screws

Filter by

System of Measurement

Thread Size

Length

Drive Style

Material

Rounded Head Style

Fastener Head Type

Finish

Washer Type

Screw Features

Thread Pitch

Head Diameter

Washer Material

Head Height

Tooth Location

Locking Type

Thread Type

Threading

Specifications Met

Federal Specification

Drive Size

Washer Finish

DFARS Specialty Metals

Exempt

Not Compliant

Export Control Classification Number (ECCN)

REACH

RoHS

98 Products

About Rounded Head Screws

These stainless steel screws have good chemical resistance and may be mildly magnetic. They’re passivated for added protection against oxidation and corrosion. All have a washer with sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

				Washer
Lg., mm	Threading	Head Dia., mm	Head Ht., mm	OD, mm.	Thick., mm	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M2.5 × 0.45 mm
4	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	000000
5	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
6	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	5.00	2.00	5.50	0.45	No. 1	70,000	ASME B18.13.1M	10	000000000	0000
M3 × 0.5 mm
4	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
5	Fully Threaded	5.60	2.40	6.50	0.45	No. 2	70,000	ASME B18.13.1M	25	000000000	00000
6	Fully Threaded	5.60	2.40	5.69	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	0000
8	Fully Threaded	5.60	2.40	5.69	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	0000
10	Fully Threaded	5.60	2.40	5.49	0.45	No. 1	70,000	ASME B18.13.1M	10	000000000	0000
12	Fully Threaded	5.60	2.40	5.69	0.45	No. 1	70,000	ASME B18.13.1M	10	000000000	0000
16	Fully Threaded	5.60	2.40	6.50	0.45	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	5.60	2.40	5.85	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
M4 × 0.7 mm
8	Fully Threaded	8.00	3.10	7.87	0.60	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
10	Fully Threaded	8.00	3.10	7.82	0.60	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
12	Fully Threaded	8.00	3.10	7.82	0.60	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	8.00	3.10	8.05	0.60	No. 2	70,000	ASME B18.13.1M	5	000000000	0000
25	Fully Threaded	8.00	3.10	8.05	0.60	No. 2	70,000	ASME B18.13.1M	5	000000000	0000
M5 × 0.8 mm
8	Fully Threaded	10.00	3.80	10.00	0.65	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
10	Fully Threaded	10.00	3.80	10.00	0.65	No. 2	70,000	ASME B18.13.1M	10	000000000	00000
12	Fully Threaded	10.00	3.80	10.00	0.65	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
14	Fully Threaded	10.00	3.80	10.00	0.65	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
16	Fully Threaded	10.00	3.80	10.00	0.65	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	9.50	3.70	10.50	0.58	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
M6 × 1 mm
10	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
12	Fully Threaded	12.00	4.60	11.00	0.75	No. 3	70,000	ASME B18.13.1M	10	000000000	00000
16	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
25	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	70,000	ASME B18.13.1M	10	000000000	0000

Metric Steel Pan Head Screws with External-Tooth Lock Washer

These screws have a washer with sharp external teeth that dig into surfaces for maximum holding power and vibration resistance. Also known as Sems screws, the washer rotates freely but is permanently attached. A zinc plating provides corrosion resistance in wet environments. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

				Washer
Lg., mm	Threading	Head Dia., mm	Head Ht., mm	OD, mm.	Thick., mm	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M3 × 0.5 mm
5	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	60,000	ASME B18.13.1M	25	000000000	000000
6	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	5.60	2.40	5.84	0.45	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
M4 × 0.7 mm
6	Fully Threaded	8.00	3.10	8.25	0.60	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	8.00	3.10	8.25	0.60	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	8.00	3.10	8.25	0.60	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	8.00	3.10	8.25	0.60	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	8.00	3.10	8.25	0.60	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
M5 × 0.8 mm
8	Fully Threaded	9.50	3.70	10.50	0.65	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	9.50	3.70	10.50	0.65	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	9.50	3.70	10.50	0.65	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	9.50	3.70	10.50	0.65	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
20	Fully Threaded	9.50	3.70	10.50	0.65	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
M6 × 1 mm
10	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	60,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	60,000	ASME B18.13.1M	25	000000000	00000
20	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	60,000	ASME B18.13.1M	25	000000000	00000
25	Fully Threaded	12.00	4.60	12.10	0.75	No. 3	60,000	ASME B18.13.1M	25	000000000	00000

Metric Stainless Steel Pan Head Screws with Internal-Tooth Lock Washer

Made from stainless steel, these screws have good chemical resistance and may be mildly magnetic. They’re passivated for added protection against oxidation and corrosion. The washer has sharp internal teeth that dig into surfaces to resist large amounts of vibration while the smooth outside edge provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

				Washer
Lg., mm	Threading	Head Dia., mm	Head Ht., mm	OD, mm.	Thick., mm	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M2.5 × 0.45 mm
4	Fully Threaded	5.00	2.00	5.59	0.38	No. 1	70,000	ASME B18.13.1M	25	000000000	000000
5	Fully Threaded	5.00	2.00	5.59	0.38	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
6	Fully Threaded	5.00	2.00	5.59	0.38	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	5.00	2.00	5.70	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	5.00	2.00	5.70	0.45	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	5.00	2.00	5.59	0.38	No. 1	70,000	ASME B18.13.1M	10	000000000	0000
M3 × 0.5 mm
4	Fully Threaded	5.60	2.40	6.68	0.43	No. 1	70,000	ASME B18.13.1M	25	000000000	00000
5	Fully Threaded	5.60	2.40	6.50	0.45	No. 2	70,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	5.60	2.40	6.50	0.45	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
M4 × 0.7 mm
16	Fully Threaded	8.00	3.10	8.50	0.60	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	8.00	3.10	8.46	0.51	No. 2	70,000	ASME B18.13.1M	5	000000000	00000
25	Fully Threaded	8.00	3.10	8.46	0.51	No. 2	70,000	ASME B18.13.1M	5	000000000	00000
30	Fully Threaded	8.00	3.10	8.43	0.51	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
M5 × 0.8 mm
8	Fully Threaded	10.00	3.80	9.60	0.56	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
10	Fully Threaded	9.00	3.45	10.00	0.60	No. 2	70,000	ASME B18.13.1M	10	000000000	00000
14	Fully Threaded	10.00	3.80	9.60	0.56	No. 2	70,000	ASME B18.13.1M	5	000000000	00000
16	Fully Threaded	10.00	3.80	9.60	0.56	No. 2	70,000	ASME B18.13.1M	5	000000000	00000
20	Fully Threaded	9.50	3.70	9.60	0.56	No. 2	70,000	ASME B18.13.1M	10	000000000	0000
M6 × 1 mm
10	Fully Threaded	12.00	4.60	11.99	0.64	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
12	Fully Threaded	12.00	4.60	11.74	0.64	No. 3	70,000	ASME B18.13.1M	5	000000000	00000
16	Fully Threaded	12.00	4.60	11.99	0.64	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	12.00	4.60	11.99	0.64	No. 3	70,000	ASME B18.13.1M	10	000000000	0000
25	Fully Threaded	12.00	4.60	11.99	0.64	No. 3	70,000	ASME B18.13.1M	10	000000000	0000

Metric Steel Pan Head Screws with Internal-Tooth Lock Washer

These screws have a washer with sharp internal teeth that dig into surfaces to resist large amounts of vibration. The smooth outside edge of the washer provides a finished look. Also known as Sems screws, the washer rotates freely but is permanently attached. All have a zinc plating to provide corrosion resistance in wet environments. Length is measured from under the head.

For technical drawings and 3-D models, click on a part number.

				Washer
Lg., mm	Threading	Head Dia., mm	Head Ht., mm	OD, mm	Thick., mm	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel
M2 × 0.4 mm
4	Fully Threaded	4.00	1.60	4.70	0.33	No. 1	60,000	ASME B18.13.1M	25	000000000	000000
5	Fully Threaded	4.00	1.60	4.70	0.33	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
6	Fully Threaded	4.00	1.60	4.70	0.33	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	4.00	1.60	4.70	0.33	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	4.00	1.60	4.70	0.33	No. 1	60,000	ASME B18.13.1M	25	000000000	00000
M4 × 0.7 mm
6	Fully Threaded	8.00	3.10	8.58	0.51	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
8	Fully Threaded	8.00	3.10	8.58	0.51	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	8.00	3.10	8.58	0.51	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	8.00	3.10	8.58	0.51	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	8.00	3.10	8.58	0.51	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
M5 × 0.8 mm
8	Fully Threaded	9.50	3.70	9.73	0.56	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
10	Fully Threaded	9.50	3.70	9.73	0.56	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
12	Fully Threaded	9.50	3.70	9.73	0.56	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
16	Fully Threaded	9.50	3.70	9.73	0.56	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
20	Fully Threaded	9.50	3.70	9.73	0.56	No. 2	60,000	ASME B18.13.1M	25	000000000	00000
M6 × 1 mm
10	Fully Threaded	12.00	4.60	12.14	0.64	No. 3	60,000	ASME B18.13.1M	10	000000000	0000
12	Fully Threaded	12.00	4.60	12.14	0.64	No. 3	60,000	ASME B18.13.1M	10	000000000	0000
16	Fully Threaded	12.00	4.60	12.14	0.64	No. 3	60,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	12.00	4.60	12.14	0.64	No. 3	60,000	ASME B18.13.1M	10	000000000	0000
25	Fully Threaded	12.00	4.60	12.14	0.64	No. 3	60,000	ASME B18.13.1M	10	000000000	0000
M8 × 1.25 mm
12	Fully Threaded	16.00	6.00	15.50	0.85	No. 4	60,000	ASME B18.13.1M	10	000000000	0000
16	Fully Threaded	16.00	6.00	15.50	0.85	No. 4	60,000	ASME B18.13.1M	10	000000000	0000
20	Fully Threaded	16.00	6.00	15.50	0.85	No. 4	60,000	ASME B18.13.1M	10	000000000	0000
25	Fully Threaded	16.00	6.00	15.50	0.85	No. 4	60,000	ASME B18.13.1M	10	000000000	0000
30	Fully Threaded	16.00	6.00	15.50	0.85	No. 4	60,000	ASME B18.13.1M	10	000000000	0000

Email Us

About Rounded Head Screws

Metric Stainless Steel Pan Head Screws with External-Tooth Lock Washer

Metric Steel Pan Head Screws with External-Tooth Lock Washer

Metric Stainless Steel Pan Head Screws with Internal-Tooth Lock Washer

Metric Steel Pan Head Screws with Internal-Tooth Lock Washer