Manufacturer, Exporter & Supplier of Hex Cap Nut

Industrial Hex Cap Nuts – Precision Fastening Solutions in Stainless & Alloy Grades

Hex Cap Nuts are precision-engineered threaded fasteners designed to secure bolts and threaded rods in structural, mechanical, and industrial assemblies. Manufactured in hexagonal form for easy torque application, these nuts comply with international standards such as DIN 1587, ISO 4032, and ASTM A194, ensuring compatibility across global engineering systems. They are widely used in industries such as construction, oil & gas, heavy machinery, and automotive manufacturing, where secure fastening and load distribution are critical.

Available in materials like stainless steel (SS 304, SS 316), carbon steel, and alloy steel, Hex Cap Nuts offer varying levels of strength, corrosion resistance, and temperature performance. Their closed-end cap design provides added protection to exposed threads, preventing damage and enhancing safety in exposed environments.

KK Fasteners supplies these components to global markets with full material traceability, supporting OEMs and EPC contractors who require consistent quality and compliance across projects.

Technical Hex Cap Nuts Specifications

Parameter	Specification
Material Variants	Stainless Steel (SS 304, 316, 316L), Carbon Steel, Alloy Steel
Grades	A2-70, A4-80, Grade 2, Grade 5, Grade 8
Size Range	M3 to M64 / 1/8" to 2"
Thread Type	Metric, UNC, UNF, BSW
Standards	DIN 1587, DIN 917, ISO 4032, ASTM A194, BS 1083
Surface Finish	Plain, Zinc Plated, Hot-Dip Galvanized, Black Oxide, PTFE Coated
Type Variants	Closed-End Cap Nuts, Dome Nuts, Heavy Hex Cap Nuts
Mechanical Properties	Tensile Strength: Up to 800 MPa (depending on grade)

DIN 1587 Hex Cap Nuts Dimension Chart

thread	Series 1	M4	M5	M6	M8	M10	M12	(M14)	M16	(M18)	M20	(M22)	M24
		Series 2	-	-	-	M8x1	M10x1	M12x1,5	(M14x1,5)	(M16x1,5)	(M18x1,5)	M20x2	(M22x1,5)	M24x2
		Series 3	-	-	-	-	M10x1,25	M12x1,25	-	-	(M18x2)	M20x1,5	(M22x2)	-
P	Series 1	0,7	0,8	1	1,25	1,5	1,75	2	2	2,5	2,5	2,5	3
da	min.	4	5	6	8	10	12	14	16	18	20	22	24
da	max.	4,6	5,75	6,75	8,75	10,8	13	15,1	17,3	19,5	21,6	23,7	25,9
dk	max.	6,5	7,5	9,5	12,5	15	17	20	23	26	28	33	34
dw	min.	5,9	6,9	8,9	11,6	14,6	16,6	19,6	22,5	24,9	27,7	31,4	33,3
e min.	Product grade A	7,66	8,79	11,05	14,38	17,77	20,03	23,35	26,75	30,14	33,53	37,72	39,98
e min.	Product grade B	7,5	8,63	10,89	14,2	17,59	19,85	22,78	26,17	29,56	32,95	37,29	39,55
x max.	Series 1	1,4	1,6	2	2,5	3	-	-	-	-	-	-	-
	Series 2	-	-	-	2	2	-	-	-	-	-	-	-
	Series 3	-	-	-	-	2,5	-	-	-	-	-	-	-
g2 max.	Series 1	-	-	-	-	-	6,4	7,3	7,3	9,3	9,3	9,3	10,7
	Series 2	-	-	-	-	-	5,6	5,6	5,6	5,6	7,3	5,6	7,3
	Series 3	-	-	-	-	-	4,9	-	-	7,3	5,6	7,3	-
h	max. nominal size	8	10	12	15	18	22	25	28	32	34	39	42
	min. P. grade A	7,64	9,64	11,57	14,57	17,57	21,48	24,48	27,48	32,38	33,38	38,38	41,38
	min. P. grade B	7,42	9,42	11,3	14,3	17,3	21,16	24,16	27,16	31	33	38	41
m	max.	3,2	4	5	6,5	88	10	11	13	15	16	18	19
m	min.	2,9	3,7	4,7	6,14	7,64	9,64	10,3	12,3	14,3	14,9	16,9	17,7
Mw	min.	2,32	2,96	3,76	4,91	6,11	7,71	8,24	9,84	11,44	11,92	13,52	14,16
r	approx.	3,25	3,75	4,75	6,25	7,5	8,5	10	11,5	13	14	16,5	17
s	Max. = nominal size	7	8	10	13	16	18	21	24	27	30	34	36
	min. P. grade A	6,78	7,78	9,78	12,73	15,73	17,73	20,67	23,67	26,67	29,67	33,38	35,38
	min. P. grade B	6,64	7,64	9,64	12,57	15,57	17,57	20,16	23,16	26,16	29,16	33	35
t	min.	5,26	7,21	7,71	10,65	12,65	15,65	17,65	20,58	24,58	25,58	28,58	30,5
t	max.	5,74	7,79	8,29	11,35	13,35	16,35	18,35	21,42	25,42	26,42	29,42	31,5
w	min.	2	2	2	2	2	3	4	4	5	5	5	6
Weight kg/1000pcs		-	-	4,66	11	20,1	28,3	-	54,3	95	104

s – size of the hexagon
t – length of the thread
d – the nominal diameter of the thread
h – height of the nut
m – hight of the nut part
dk – head diameter
da – Turning diameter shrinkage
dw – contact surface diameter
mw – minimum wrenching height

Stainless Steel Hex Cap Nuts - Grades

Stainless Steel 304 Hex Cap Nuts
Stainless Steel 304L Hex Cap Nuts
Stainless Steel 304H Hex Cap Nuts
Stainless Steel 310 Hex Cap Nuts
Stainless Steel 310S Hex Cap Nuts
Stainless Steel 310H Hex Cap Nuts
Stainless Steel 316 Hex Cap Nuts
Stainless Steel 316L Hex Cap Nuts
Stainless Steel 316Ti Hex Cap Nuts
Stainless Steel 317 Hex Cap Nuts
Stainless Steel 317L Hex Cap Nuts
Stainless Steel 321 Hex Cap Nuts
Stainless Steel 321H Hex Cap Nuts
Stainless Steel 347 Hex Cap Nuts
Stainless Steel 347H Hex Cap Nuts
Stainless Steel 904L Hex Cap Nuts
Stainless Steel 410 Hex Cap Nuts
Stainless Steel 446 Hex Cap Nuts
SMO 254 Hex Cap Nuts
17-4 PH Stainless Steel Hex Cap Nuts

Grades of Nickel Alloys Hex Cap Nuts

Inconel 600 Hex Cap Nuts
Inconel 601 Hex Cap Nuts
Inconel 625 Hex Cap Nuts
Inconel 718 Hex Cap Nuts
Incoloy 800 Hex Cap Nuts
Incoloy 825 Hex Cap Nuts
Monel 400 Hex Cap Nuts
Monel K500 Hex Cap Nuts
Nickel 200 Hex Cap Nuts
Nickel 201 Hex Cap Nuts
Hastelloy C276 Hex Cap Nuts
Hastelloy C22 Hex Cap Nuts
Hastelloy B2 Hex Cap Nuts
Hastelloy B3 Hex Cap Nuts
Hastelloy X Hex Cap Nuts

Duplex Steel Hex Cap Nuts- Grades

UNS S32205 Hex Cap Nuts
UNS S31803 Hex Cap Nuts

Super Duplex Steel Hex Cap Nuts - Grades

UNS S32750 Hex Cap Nuts
UNS S32760 Hex Cap Nuts

Inconel/Incoloy Hex Cap Nuts - Grades

Inconel 600 Hex Cap Nuts
Inconel 601 Hex Cap Nuts
Inconel 625 Hex Cap Nuts
Inconel 718 Hex Cap Nuts
Incoloy 800 Hex Cap Nuts
Incoloy 825 Hex Cap Nuts

Monel Hex Cap Nuts - Grades

Monel 400 Hex Cap Nuts
Monel K500 Hex Cap Nuts

Nickel Hex Cap Nuts - Grades

Nickel 200 Hex Cap Nuts
Nickel 201 Hex Cap Nuts

Hastelloy Hex Cap Nuts - Grades

Hastelloy C276 Hex Cap Nuts
Hastelloy C22 Hex Cap Nuts
Hastelloy B2 Hex Cap Nuts
Hastelloy B3 Hex Cap Nuts
Hastelloy X Hex Cap Nuts

Titanium Hex Cap Nuts - Grades

Titanium Grade 2 Hex Cap Nuts
Titanium Grade 5 Hex Cap Nuts

Tantalum Hex Cap Nuts- Grades

UNS R05200 Hex Cap Nuts
UNS R05252 Hex Cap Nuts
UNS R05255 Hex Cap Nuts
UNS R05400 Hex Cap Nuts

Cupro Nickel Hex Cap Nuts - Grades

CuNi 90/10 Hex Cap Nuts
CuNi 70/30 Hex Cap Nuts

Copper Hex Cap Nuts - Grades

UNS C11000 Hex Cap Nuts
UNS C10100 Hex Cap Nuts
UNS C10200 Hex Cap Nuts
UNS C12000 Hex Cap Nuts
UNS C12200 Hex Cap Nuts

Carbon Steel Hex Cap Nuts - Grades

Carbon Steel AISI 1018 Hex Cap Nuts
Carbon Steel AISI 1020 Hex Cap Nuts
Carbon Steel AISI 1040 Hex Cap Nuts
Carbon Steel AISI 1045 Hex Cap Nuts

Alloy Steel Hex Cap Nuts - Grades

Alloy Steel 4130 Hex Cap Nuts
Alloy Steel 4140 Hex Cap Nuts
Alloy Steel 4340 Hex Cap Nuts
Alloy Steel 8620 Hex Cap Nuts
ASTM A193 Alloy Steel Gr B7 Hex Cap Nuts
ASTM A193 Alloy Steel Gr B7M Hex Cap Nuts
ASTM A320 Alloy Steel Gr L7 Hex Cap Nuts
ASTM A320 Alloy Steel Gr L7M Hex Cap Nuts
ASTM A320 Alloy Steel Gr L43 Hex Cap Nuts
ASTM A320 Alloy Steel Gr L43 Hex Cap Nuts
ISO 898-1 Alloy Steel Gr 8.8 Hex Cap Nuts
ISO 898-1 Alloy Steel Gr 10.9 Hex Cap Nuts
ISO 898-1 Alloy Steel Gr 12.9 Hex Cap Nuts

Brass Hex Cap Nuts - Grades

UNS C21000 Hex Cap Nuts
UNS C22000 Hex Cap Nuts
UNS C22600 Hex Cap Nuts
UNS C23000 Hex Cap Nuts
UNS C24000 Hex Cap Nuts
UNS C26000 Hex Cap Nuts
UNS C26800 Hex Cap Nuts
UNS C27000 Hex Cap Nuts
UNS C27200 Hex Cap Nuts
UNS C28000 Hex Cap Nuts
UNS C33000 Hex Cap Nuts
UNS C33500 Hex Cap Nuts
UNS C34000 Hex Cap Nuts
UNS C34200 Hex Cap Nuts
UNS C35300 Hex Cap Nuts
UNS C35600 Hex Cap Nuts

Aluminium Hex Cap Nuts - Grades

Aluminium Alloy 1050 Hex Cap Nuts
Aluminium Alloy 1060 Hex Cap Nuts
Aluminium Alloy 1060 Hex Cap Nuts
Aluminium Alloy 1070 Hex Cap Nuts
Aluminium Alloy 1080 Hex Cap Nuts
Aluminium Alloy 1100 Hex Cap Nuts
Aluminium Alloy 1145 Hex Cap Nuts
Aluminium Alloy 2011 Hex Cap Nuts
Aluminium Alloy 2014 Hex Cap Nuts
Aluminium Alloy 2017 Hex Cap Nuts
Aluminium Alloy 2024 Hex Cap Nuts
Aluminium Alloy 2090 Hex Cap Nuts
Aluminium Alloy 3003 Hex Cap Nuts
Aluminium Alloy 5052 Hex Cap Nuts
Aluminium Alloy 5083 Hex Cap Nuts
Aluminium Alloy 6061 Hex Cap Nuts
Aluminium Alloy 6063 Hex Cap Nuts
Aluminium Alloy 6066 Hex Cap Nuts
Aluminium Alloy 6082 Hex Cap Nuts
Aluminium Alloy 7050 Hex Cap Nuts
Aluminium Alloy 7075 Hex Cap Nuts

Zirconium Hex Cap Nuts - Grades

UNS R60700 Hex Cap Nuts
UNS R60702 Hex Cap Nuts
UNS R60704 Hex Cap Nuts
UNS R60705 Hex Cap Nuts
UNS R60706 Hex Cap Nuts

Beryllium Copper Hex Cap Nuts - Grades

UNS C17200 Hex Cap Nuts
UNS C17300 Hex Cap Nuts
UNS C17500 Hex Cap Nuts
UNS C17510 Hex Cap Nuts

Phosphor Bronze Hex Cap Nuts - Grades

UNS C51000 Hex Cap Nuts
UNS C51900 Hex Cap Nuts
UNS C52100 Hex Cap Nuts
UNS C54400 Hex Cap Nuts

Silicon Bronze Hex Cap Nuts - Grades

UNS C65100 Hex Cap Nuts
UNS C65500 Hex Cap Nuts
UNS C66100 Hex Cap Nuts

Key Technical Features

Designed with a closed-end dome structure that protects exposed threads from corrosion and mechanical damage, improving assembly longevity.
Manufactured to ISO tolerance classes (6H), ensuring precise thread engagement and minimizing the risk of loosening under vibration.
Capable of handling tensile loads up to 800 MPa (Grade 8 variants), making them suitable for high-load structural applications.
Corrosion-resistant stainless steel grades (SS 316) provide excellent performance in marine and chemical environments.
Hexagonal geometry allows uniform torque distribution during tightening, reducing stress concentration on mating components.
Available with multiple coating options such as hot-dip galvanizing for enhanced outdoor durability.
Compatible with standard bolts and threaded rods across DIN, ISO, and ASTM systems, ensuring global interchangeability.
Smooth dome finish improves safety by eliminating sharp exposed threads in accessible assemblies.

Industry Applications

Hex Cap Nuts are used in applications where thread protection, secure fastening, and aesthetic finishing are required alongside mechanical strength.

Automotive Assemblies — Used in wheel hubs and exposed bolt connections to protect threads and improve safety.
Construction & Structural Steel — Secures structural joints where exposed bolts require corrosion protection.
Oil & Gas Equipment — Applied in pipelines and flange connections to prevent thread damage in harsh environments.
Marine Installations — Stainless steel variants resist saltwater corrosion in shipbuilding and offshore platforms.
Industrial Machinery — Used in rotating equipment and housings to maintain secure fastening under vibration.
Electrical Enclosures — Provides safe, enclosed fastening points without exposed sharp threads.
Railway Infrastructure — Used in track systems and mechanical joints requiring durability and tamper resistance.

Manufacturing & Quality Assurance

Hex Cap Nuts are typically produced using cold forging or hot forging processes, followed by precision CNC machining to achieve accurate thread profiles and dimensional consistency. Thread rolling ensures superior surface finish and enhanced fatigue strength compared to cut threads.

Quality control involves dimensional inspection using calibrated gauges, hardness testing (Rockwell scale), and coating thickness verification for plated variants. Each batch undergoes material traceability checks aligned with ISO 9001 quality management systems.

At KK Fasteners, inspection protocols include lot-based documentation, ensuring that every shipment meets international standards and client-specific requirements.

Wide Range of Quality Products

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Competitive Pricing and Cost Savings

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Exceptional Customer Service

Personalized assistance, prompt responses, and a commitment to meeting your needs, making your purchase process seamless.

Send us your Requirement for Hex Cap Nuts

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Hex Cap Nuts - FAQs

What are Hex Cap Nuts?

Hex Cap Nuts are closed-end hexagonal fasteners designed to cover and protect exposed bolt threads while providing secure fastening. They are commonly used in structural and mechanical assemblies where safety, corrosion resistance, and a clean finished appearance are required.

What materials are used for Hex Cap Nuts?

Hex Cap Nuts are typically manufactured in stainless steel (SS 304, SS 316), carbon steel, and alloy steel. Stainless steel provides excellent corrosion resistance, while carbon and alloy steels offer higher tensile strength for heavy-duty and structural applications.

Which standards apply to Hex Cap Nuts?

Hex Cap Nuts are produced in accordance with international standards such as DIN 1587 (dome nuts), DIN 917 (high cap nuts), ISO 4032, and ASTM A194. These standards ensure dimensional accuracy and compatibility with global fastening systems.

How do I choose the right Hex Cap Nut?

The correct selection depends on load requirements, environmental conditions, and thread compatibility. For corrosive environments, stainless steel 316 is recommended, while high-strength alloy steel grades are suitable for applications involving heavy loads or dynamic stress.

How can I find a reliable Hex Cap Nuts manufacturer and exporter?

A reliable supplier should offer ISO-certified production, full material traceability, and compliance with international standards. KK Fasteners supports global clients with consistent quality, documented testing, and experience in supplying across multiple industries.

Hex Cap Nuts - Export Destination

Hex Cap Nuts Supplier in North America

Antigua and Barbuda, Bahamas, Barbados, Belize, Canada, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, United States.

Hex Cap Nuts Supplier in South America

Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Falkland Islands, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela.

Hex Cap Nuts Supplier in Europe

Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic (Czechia), Denmark, Estonia, Finland, France, Germany, Greece, Holy See, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom.

Hex Cap Nuts Supplier in Asia

Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Cyprus, Georgia, India, Indonesia, Iran, Iraq, Israel, Japan, Jordan, Kazakhstan, Kuwait, Kyrgyzstan, Laos, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, Oman, Pakistan, Palestine, Philippines, Qatar, Saudi Arabia, Singapore, South Korea, Sri Lanka, State of Palestine, Syria, Taiwan, Tajikistan, Thailand, Timor-Leste, Turkey, Turkmenistan, United Arab Emirates, Uzbekistan, Vietnam, Yemen.

Hex Cap Nuts Supplier in Australia

Australia, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Zealand, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.

Precision fastening requires consistency in both design and manufacturing. Hex Cap Nuts supplied by KK Fasteners are engineered to meet global standards while supporting project-specific customization. For detailed specifications, material certifications, or bulk pricing, request a quote or connect with the engineering team to discuss your application requirements.

Hex Cap Nuts