McMaster-Carr

Choose these Class 10.9 steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. Dimensions meet ISO (formerly DIN) specifications. Length is measured from under the head.

Steel screws should be used in dry, noncorrosive environments. Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch.

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

				Head
Lg., mm	Threading	Min. Thread Lg., mm	Thread Spacing	Wd., mm	Ht., mm	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Class 10.9 Steel
M18 × 2.5 mm
55	Partially Threaded	37	Coarse	27	11.5	150,000	ISO 4014, DIN 931	5	000000000	00000
60	Partially Threaded	37	Coarse	27	11.5	150,000	ISO 4014, DIN 931	5	000000000	0000
70	Partially Threaded	37	Coarse	27	11.5	150,000	ISO 4014, DIN 931	5	000000000	00000
80	Partially Threaded	37	Coarse	27	11.5	150,000	ISO 4014, DIN 931	5	000000000	00000
100	Partially Threaded	37	Coarse	27	11.5	150,000	ISO 4014, DIN 931	5	000000000	00000

Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Fully Threaded

These Class 8.8 steel screws are suitable for fastening most machinery and equipment. Dimensions meet ISO (formerly DIN) specifications. Length is measured from under the head.

Zinc-plated steel screws resist corrosion in wet environments. Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.

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

			Head
Lg., mm	Threading	Thread Spacing	Wd., mm	Ht., mm	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
Zinc-Plated Class 8.8 Steel
M18 × 2.5 mm
30	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	00000
35	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	0000
40	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	0000
45	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	0000
50	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	0000
60	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	00000
70	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	00000
80	Fully Threaded	Coarse	27	11.5	110,000	ISO 4017, DIN 933	5	000000000	00000
M18 × 1.5 mm
30	Fully Threaded	Fine	27	11.5	110,000	ISO 8676, DIN 961	1	000000000	0000
40	Fully Threaded	Fine	27	11.5	110,000	ISO 8676, DIN 961	1	000000000	0000
50	Fully Threaded	Fine	27	11.5	110,000	ISO 8676, DIN 961	1	000000000	0000
60	Fully Threaded	Fine	27	11.5	110,000	ISO 8676, DIN 961	1	000000000	0000

18-8 Stainless Steel Hex Head Screws

Fully 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.

Metric screws are also known as A2 stainless steel screws.

Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.

Screws that meet ASME or ISO (formerly DIN) specifications comply with these dimensional standards.

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

			Head
Lg.	Threading	Thread Spacing	Wd.	Ht.	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel
M18 × 2.5 mm
30mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	00000
40mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	0000
50mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	0000
60mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	0000
80mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	0000
100mm	Fully Threaded	Coarse	27mm	11.5mm	100,000	ISO 4017, DIN 933	1	000000000	0000

Alloy Steel Socket Head Screws

Fully Threaded

Partially Threaded

With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.

Black-oxide steel screws are mildly corrosion resistant in dry environments.

Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Screws that meet ASME B18.3, ASME B18.3M, ISO 21269, and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

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

				Head
Lg., mm	Threading	Min. Thread Lg., mm	Thread Spacing	Dia., mm	Ht., mm	Drive Size, mm	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
M18 × 2.5 mm
Black-Oxide Class 12.9 Alloy Steel
30	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	00000
35	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
40	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	0000
45	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	0000
50	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	0000
55	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	0000
60	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	00000
65	Fully Threaded	__	Coarse	27	18	14	170,000	DIN 912, ISO 4762	5	000000000	00000
70	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
75	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
80	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
90	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
100	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
110	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
120	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
130	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
140	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
150	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
160	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
180	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000
200	Partially Threaded	48	Coarse	27	18	14	170,000	DIN 912, ISO 4762	1	000000000	0000

Metric Alloy Steel Hex Drive Flat Head Screws

Black Oxide and Blue-Dyed Zinc Plated

Made from alloy steel, these screws are nearly twice as strong as stainless steel flat head screws. They're angled under the head to sit flush within countersunk holes. Length is measured from the top of the head.

Black-oxide alloy steel screws have mild corrosion resistance in dry environments.

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

Black-Oxide Class 10.9 Alloy Steel
Lg., mm	Threading	Head Dia., mm	Head Ht., mm	Drive Size, mm	Tensile Strength, psi	Specifications Met	Pkg. Qty.		Pkg.
M18 × 2.5 mm
40	Fully Threaded	33	8	12	120,000	DIN 7991, ISO 10642	5	000000000	000000
50	Fully Threaded	33	8	12	120,000	DIN 7991, ISO 10642	5	000000000	00000
60	Fully Threaded	33	8	12	120,000	DIN 7991, ISO 10642	5	000000000	00000

Metric High-Strength Steel Threaded Rods—Class 10.9

These Class 10.9 steel threaded rods are about 25% stronger than medium-strength steel rods.

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

Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met		Each
M18
50 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	000000
100 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	00000
150 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	00000
200 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	00000
300 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	00000
500 mm	2.5	150,000	Rockwell C32	DIN 975	0000000	00000
1 m	2.5	150,000	Rockwell C32	DIN 975	0000000	00000

Metric Medium-Strength Steel Threaded Rods—Grade B7

These Grade B7 threaded rods meet the pressure and temperature requirements of ASTM A193 and are often used to secure pressure tanks, valves, and flanges.

Zinc yellow-chromate plated steel threaded rods resist corrosion in wet environments.

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

Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met		Each
M18
50 mm	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	00000
100 mm	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	0000
300 mm	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	00000
1 m	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	00000
2 m	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	00000
Zinc Yellow-Chromate Plated Steel
M18
1 m	2.5	120,000	Rockwell C35	ASTM A193, DIN 976	000000000	00000

Medium-Strength Steel Threaded Rods—Class 8.8

An economical alternative to Grade B7 and Grade B16 threaded rods, these metric Class 8.8 rods are suitable for fastening most machinery and equipment.

Zinc-plated steel threaded rods resist corrosion in wet environments.

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

Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met		Each
M18
1 m	2.5	110,000	Rockwell C20	DIN 975	000000000	000000
Zinc-Plated Steel
M18
1 m	2.5	110,000	Rockwell C20	DIN 975	000000000	00000

Metric Fine-Thread Low-Strength Steel Threaded Rods

About half the strength of medium-strength steel threaded rods, use these for light duty hanging, mounting, and fastening.

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

Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met		Each
M18
150 mm	1.5	50,000	Rockwell B49	DIN 975	000000000	000000
300 mm	1.5	50,000	Rockwell B49	DIN 976	000000000	00000
1 m	1.5	50,000	Rockwell B49	DIN 975	000000000	00000

Metric Low-Strength Steel Threaded Rods

These threaded rods are about half the strength of medium-strength steel threaded rods for light duty hanging, mounting, and fastening.

Zinc-plated steel threaded rods are corrosion resistant in wet environments.

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

Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M18
300 mm	2.5	50,000	Rockwell B49	DIN 976	1	000000000	000000
Zinc-Plated Steel
M18
300 mm	2.5	50,000	Rockwell B49	DIN 976	1	000000000	00000
1 m	2.5	50,000	Rockwell B49	DIN 976	1	000000000	00000

Metric 18-8 Stainless Steel Threaded Rods

These 18-8 stainless steel threaded rods have good chemical resistance and may be mildly magnetic.

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

18-8 Stainless Steel
Lg.	Thread Pitch, mm	Tensile Strength, psi	Hardness	Specifications Met	Pkg. Qty.		Pkg.
M18
50 mm	2.5	70,000	Not Rated	DIN 976	1	000000000	00000
100 mm	2.5	70,000	Not Rated	DIN 976	1	000000000	00000
1 m	2.5	70,000	Not Rated	DIN 976	1	000000000	00000

Metric 18-8 Stainless Steel Coupling Nuts

Stainless Steel

Black-Oxide Stainless Steel

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.

Coupling nuts with a black-oxide finish have a dark surface color.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
18-8 Stainless Steel
M18	2.5	54	27	DIN 6334	000000000	000000	000000
Black-Oxide 18-8 Stainless Steel
M18	2.5	54	27	DIN 6334	000000000	00000	00000

Metric Super-Corrosion-Resistant
316 Stainless Steel Coupling Nuts

Made from 316 stainless steel, these coupling have excellent resistance to chemicals and salt water. Also known as extension nuts, use them to connect and extend threaded rods. They may be mildly magnetic.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
316 Stainless Steel
M18	2.5	54	27	DIN 6334	000000000	000000	000000

Metric Medium-Strength Steel Coupling Nuts—Class 8

Often referred to as extension nuts, use these to connect and extend threaded rods. They're comparable in strength to Class 8.8 bolts.

Zinc-plated steel coupling nuts resist corrosion in wet environments.

Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.

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

Thread						Each
Size	Pitch, mm	Lg., mm	Wd., mm	Specifications Met		1-9	10-Up
Zinc-Plated Steel—Class 8
M18	2.5	54	27	DIN 6334	000000000	000000	000000
Black-Oxide Steel—Class 8
M18	2.5	54	27	DIN 6334	000000000	00000	00000

Stainless Steel Extra-Long Coupling Nuts

These coupling nuts have good chemical resistance. Also known as sleeve nuts, they're at least twice the length of standard coupling nuts to provide more room to connect and extend long lengths of threaded rods.

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

Metric

Thread							Each
Size	Pitch, mm	Lg., mm	Wd., mm	Threading	Min. Thread Lg., mm		1-9	10-Up
18-8 Stainless Steel
M18	2.5	108	24	Partially Threaded	18	000000000	0000000	000000

Eyebolts—For Lifting

With Shoulder

Also known as machinery eyebolts.

Galvanized steel eyebolts have a hot-dipped finish for more corrosion resistance than zinc-plated steel.

Note: Capacities listed are for vertical lifting only. Eyebolts with shoulder can be used for angular lifting up to 45°, but the capacities will be significantly reduced. For angular lifting, we recommend Hoist Rings.

Warning: Never use to lift people or items over people.

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

Metric Thread

Thread							With Shoulder
Size	Pitch, mm	Lg., mm	Shank Lg., mm	Overall Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.		Each
Steel
M18	2.5	36	36	118	38	4,700	0000000	000000
M18	2.5	76	76	158	38	4,700	0000000	00000
Galvanized Steel
M18	2.5	51	51	133	38	4,700	0000000	00000

Eyebolts with Nuts—For Lifting

With Shoulder

Without Shoulder

Also known as nut eyebolts, these are designed for through-hole applications.

316 stainless steel are the most corrosion resistant eyebolts.

Warning: Never use to lift people or items over people.

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

Metric Thread

Thread							Nuts
Size	Pitch, mm	Lg., mm	Shank Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.	Threading	No. Included	Style	Overall Lg., mm		Each
With Shoulder
316 Stainless Steel
M18	2.5	26	26	38	5,125	Fully Threaded	1	Hex	102	0000000	000000
Without Shoulder
316 Stainless Steel
M18	2.5	26	26	38	5,125	Fully Threaded	1	Hex	102	0000000	00000

Eye Nuts—For Lifting

Create your own lifting eye by adding an eye nut to a stud or bolt.

316 stainless steel are the most corrosion resistant eye nuts.

Note: Capacity applies to the eye nut only. The stud or bolt you use will affect the overall capacity. Eye nuts are for vertical lifting only.

Warning: Never use to lift people or items over people.

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

Metric Thread

	Thread
	Size	Pitch, mm	Overall Lg., mm	Eye Dia., mm	Vertical Capacity, lbs.		Each
Steel
B	M18	2.5	98	38	6,000	0000000	000000
316 Stainless Steel
C	M18	2.5	99	42	4,700	0000000	00000

Metric Ball Screws and Nuts

Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, these have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread size and pitch. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.

Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.

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

Ball Screws—Right-Hand Threaded

Root diameter indicates the diameter the ball screw will be after machining away the threads.

Carbon Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Root Dia., mm	Hardness	Temperature Range, °F		Each
M18	8	500	1	8	±0.210 mm per 300 mm	14.4	Rockwell C58	Not Rated to 175°	00000000	0000000
M18	8	1,000	1	8	±0.210 mm per 300 mm	14.4	Rockwell C58	Not Rated to 175°	00000000	000000
M18	8	1,500	1	8	±0.210 mm per 300 mm	14.4	Rockwell C58	Not Rated to 175°	00000000	000000

Platform Ball Nuts—Right-Hand Threaded

Alloy Steel
Thread Size	Thread Pitch, mm	Lg., mm	Wd., mm	Ht., mm	Center Ht., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temperature Range, °F		Each
M18	8	56	48	44	17	1	8	Rockwell C58	2,940	0.1	Seals	Not Rated to 175°	00000000	0000000

Flange Ball Nuts—Right-Hand Threaded

				Flange
Thread Size	Thread Pitch, mm	Lg., mm	Dia., mm	Dia., mm	Thick., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temperature Range, °F		Each
Alloy Steel
M18	8	61	50	80	12	1	8	Rockwell C58	2,940	0.1	Seals	Not Rated° to 175°	00000000	0000000

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Selecting Compatible Lead Screws and Nuts

About Nuts, Materials, and Finishes

About Threaded Studs and Rods

About Hex Head Screws and Bolts

About Socket Head Screws

About Flat Head Screws

High-Strength Metric Class 10.9 Steel Hex Head Screws

Medium-Strength Metric Class 8.8 Steel Hex Head Screws

18-8 Stainless Steel Hex Head Screws

Alloy Steel Socket Head Screws

Metric Alloy Steel Hex Drive Flat Head Screws

Metric High-Strength Steel Threaded Rods—Class 10.9

Metric Medium-Strength Steel Threaded Rods—Grade B7

Medium-Strength Steel Threaded Rods—Class 8.8

Metric Fine-Thread Low-Strength Steel Threaded Rods

Metric Low-Strength Steel Threaded Rods

Metric 18-8 Stainless Steel Threaded Rods

Metric 18-8 Stainless Steel Coupling Nuts

Metric Super-Corrosion-Resistant316 Stainless Steel Coupling Nuts

Metric Medium-Strength Steel Coupling Nuts—Class 8

Stainless Steel Extra-Long Coupling Nuts

Eyebolts—For Lifting

Eyebolts with Nuts—For Lifting

Eye Nuts—For Lifting

Metric Ball Screws and Nuts

Metric Super-Corrosion-Resistant
316 Stainless Steel Coupling Nuts