Silver Plated Fasteners | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

2-56
4-40
6-32
8-32
10-24
10-32
1/4"-20
1/4"-28
5/16"-24
3/8"-24
M3
M4
M5
M6

	Length Length

	Material Material

18-8 Stainless Steel

A286 Stainless Steel

	Finish Finish	Show

Silver Plated

	Finish Finish	Hide

Black Ultra-Corrosion-
Resistant Coated

Blue Ultra-Corrosion-
Resistant Coated

Cadmium Yellow-
Chromate Plated

Chromate Conversion
Coated

Chrome Plated

Copper Coated

Copper Plated

Corrosion-Resistant
Coated

Corrosion-Resistant
Coating

Dry Film Lubricated

Galvanic Barrier Coated

Hot-Dipped Galvanized

Lacquer Coated

Latex Coated

Metalized

Neoprene Rubber Coated

Silver Ultra-Corrosion-
Resistant Coated

Trivalent Zinc Plated

Ultra-Corrosion-Resistant
Coated

Yellow-Chromate Plated

Zinc Galvanized

Zinc Plated

Zinc Yellow-Chromate
Plated

	Head Type Head Type

	Socket

	Socket Head Profile Socket Head Profile

	Standard

	Threading Threading

	Fully Threaded
	Partially Threaded

	Drive Style Drive Style


Hex	External Hex

	Thread Direction Thread Direction

	Right Hand

	Specifications Met Specifications Met

	Head Diameter Head Diameter

	Thread Type Thread Type

	Thread Pitch Thread Pitch

	Head Height Head Height

	Thread Spacing Thread Spacing

Coarse

Fine

	Nut Type Nut Type


Flange	Hex

Locknut	Rivet Mount

	Drive Size Drive Size

	Thread Fit Thread Fit

Class 3A

Class 3B

Class 6g

	Tensile Strength Tensile Strength

70,000 psi

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Hardness Hardness

Rockwell B70

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83 Products

About Nuts, Materials, and Finishes

About Socket Head Screws

Fully Threaded

Partially Threaded

Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.Silver-plated stainless steel screws have mild lubricity so they thread smoothly.

Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

Screws that meet ASME B1.1, ASME B18.3, ISO 21269, and ISO 4762 (formerly DIN 912) comply with standards for dimensions. Screws that meet ASTM B456 and ASTM F837 comply with standards for materials.

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

			Head
Lg.	Threading	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
2-56
Silver-Plated 18-8 Stainless Steel
1/8"	Fully Threaded	Coarse	9/64"	0.086"	5/64"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/16"	Fully Threaded	Coarse	9/64"	0.086"	5/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1/4"	Fully Threaded	Coarse	9/64"	0.086"	5/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
3/8"	Fully Threaded	Coarse	9/64"	0.086"	5/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1/2"	Fully Threaded	Coarse	9/64"	0.086"	5/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000

			Head
Lg.	Threading	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
4-40
Silver-Plated 18-8 Stainless Steel
1/4"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/8"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1/2"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
5/8"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/4"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
6-32
Silver-Plated 18-8 Stainless Steel
1/4"	Fully Threaded	__	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/8"	Fully Threaded	__	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1/2"	Fully Threaded	__	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
5/8"	Fully Threaded	__	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
3/4"	Fully Threaded	__	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1"	Partially Threaded	3/4"	Coarse	0.226"	0.138"	7/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
8-32
Silver-Plated 18-8 Stainless Steel
3/8"	Fully Threaded	__	Coarse	0.27"	0.164"	9/64"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
1/2"	Fully Threaded	__	Coarse	0.27"	0.164"	9/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
5/8"	Fully Threaded	__	Coarse	0.27"	0.164"	9/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
3/4"	Fully Threaded	__	Coarse	0.27"	0.164"	9/64"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1"	Partially Threaded	3/4"	Coarse	0.27"	0.164"	9/64"	70,000	ASME B18.3, ASTM F837	5	000000000	00000

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
10-24
Silver-Plated 18-8 Stainless Steel
1/2"	Fully Threaded	__	Coarse	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/4"	Fully Threaded	__	Coarse	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1"	Partially Threaded	7/8"	Coarse	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
10-32
Silver-Plated 18-8 Stainless Steel
3/8"	Fully Threaded	__	Fine	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
1/2"	Fully Threaded	__	Fine	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
5/8"	Fully Threaded	__	Fine	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
3/4"	Fully Threaded	__	Fine	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	0000
1"	Partially Threaded	7/8"	Fine	5/16"	0.19"	5/32"	70,000	ASME B18.3, ASTM F837	5	000000000	00000

				Head
Lg.	Threading	Min. Thread Lg.	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
1/4"-20
Silver-Plated 18-8 Stainless Steel
1/2"	Fully Threaded	__	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
5/8"	Fully Threaded	__	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
3/4"	Fully Threaded	__	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
1"	Fully Threaded	__	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
1 1/4"	Partially Threaded	1"	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000
1 1/2"	Partially Threaded	1"	Coarse	3/8"	1/4"	3/16"	70,000	ASME B18.3, ASTM F837	5	000000000	00000

Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum

Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems. 18-8 stainless steel releases gas at a slower rate than other metals, allowing your system to achieve higher levels of vacuum. Screws are silver plated for lubricity, reducing wear over time. Length is measured from under the head.

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

			Head
Lg.	Threading	Thread Spacing	Dia.	Ht.	Drive Size	Tensile Strength, psi	Environmental Rating	Specifications Met		Each
Silver-Plated 18-8 Stainless Steel
4-40
1/2"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	000000
3/4"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.183"	0.112"	3/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
6-32
1/2"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.226"	0.138"	7/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
8-32
1/2"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	0.27"	0.164"	9/64"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
10-32
1/2"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Fine	5/16"	0.19"	5/32"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1/4"-20
1/2"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
3/4"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
1"	Fully Threaded	Coarse	3/8"	1/4"	3/16"	70,000	Fed. Std. Class 100, ISO Class 5	__	000000000	00000
M3 × 0.5 mm
8mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	5.5mm	3mm	2.5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M4 × 0.7 mm
8mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	7mm	4mm	3 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M5 × 0.8 mm
8mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	8.5mm	5mm	4 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
M6 × 1 mm
8mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
10mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000
12mm	Fully Threaded	Coarse	10mm	6mm	5 mm	70,000	Fed. Std. Class 100, ISO Class 5	DIN 912, ISO 4762	000000000	00000

Mil. Spec. Stainless Steel Flex-Top Locknuts for Heavy Vibration

Choose these locknuts for their adherence to strict military standards for material and construction. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. Threads at the top of the nut expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. A silver plating adds lubricity so they thread on smoothly.

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

Silver-Plated 18-8 Stainless Steel
Thread Size	Wd.	Ht.	Specifications Met	Pkg. Qty.		Pkg.
4-40	1/4"	9/64"	MS21046C04, NASM21046	1	000000000	000000
6-32	5/16"	11/64"	MS21046C06, NASM21046	1	000000000	00000
8-32	11/32"	15/64"	MS21046C08, NASM21046	1	000000000	0000
10-32	3/8"	15/64"	MS21046C3, NASM21046	1	000000000	00000
1/4"-28	7/16"	9/32"	MS21046C4, NASM21046	1	000000000	00000
3/8"-24	9/16"	25/64"	MS21046C6, NASM21046	1	000000000	00000

Stainless Steel Distorted-Thread Flange Locknuts

These flange locknuts have excellent resistance to chemicals and salt water. They have an irregularly shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts. A flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. These nuts may be mildly magnetic. Height includes the flange.

A286 stainless steel nuts cannot be reused.

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

			Flange
Thread Size	Wd.	Ht.	Dia.	Thick.	Specifications Met	Pkg. Qty.		Pkg.
Silver-Plated A286 Stainless Steel
4-40	5/32"	1/8"	0.206"	0.03"	MS21043-04	5	000000000	000000
6-32	3/16"	9/64"	0.244"	0.03"	MS21043-06	5	000000000	0000
8-32	7/32"	3/16"	0.29"	0.03"	MS21043-08	5	000000000	00000
10-32	1/4"	3/16"	0.33"	0.03"	MS21043-3	5	000000000	0000
1/4"-28	5/16"	7/32"	0.42"	0.04"	MS21043-4	5	000000000	0000
5/16"-24	3/8"	17/64"	0.52"	0.04"	MS21043-5	1	000000000	0000
3/8"-24	7/16"	9/32"	0.62"	0.04"	MS21043-6	1	000000000	0000

Mil. Spec. Rivet-Mount Nuts

Silver-Plated Stainless Steel

Create threads in hard-to-work areas—where you can’t reach the back of a workpiece, or material is too thin to be tapped. For a strong grip, these nuts have distorted threads that increase friction with bolts. Because they mount with two rivets, they won’t spin when you’re tightening screws. However, these nuts do move inside their retainers, which lets you install bolts at a slight angle; use them to align with off-center parts. All meet military guidelines for dimensions and material.

A286 stainless steel nuts are corrosion resistant. Silver-plated stainless steel nuts withstand temperatures up to 800° F. The silver plating also adds lubricity and prevents seizing caused by friction between nuts and bolts.

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

	Base			Barrel		Mounting
Thread Size	Lg.	Wd.	Thick.	Dia.	Ht.	No. of Holes	Hole Dia.	Hole Ctr.-to-Ctr.	Specifications Met		Each
Silver-Plated A286 Stainless Steel—Unlubricated
4-40	21/32"	5/16"	3/32"	0.141"	1/16"	2	0.098"	13/32"	MS21076-04N	000000000	00000
6-32	61/64"	13/32"	1/32"	0.156"	11/64"	2	0.098"	11/16"	MS21060-06	000000000	0000
8-32	45/64"	23/64"	3/32"	0.168"	5/32"	2	0.098"	15/32"	MS21076-08N	000000000	00000
10-32	47/64"	13/32"	3/32"	0.194"	5/32"	2	0.098"	1/2"	MS21076-3N	000000000	0000
10-32	61/64"	13/32"	1/32"	0.194"	7/32"	2	0.098"	11/16"	MS21060-3	000000000	0000
1/4"-28	51/64"	1/2"	3/32"	0.254"	3/16"	2	0.098"	9/16"	MS21076-4N	000000000	00000
1/4"-28	1 19/64"	33/64"	1/32"	0.254"	1/4"	2	0.098"	1"	MS21060-4	000000000	00000
5/16"-24	1 1/64"	37/64"	7/64"	0.317"	7/32"	2	0.13"	23/32"	MS21076-5N	000000000	00000