Stainless Steel Threaded Rod

Stainless steel threaded rod (also called a “stud” or “all-thread rod”) is a long metal rod with threads throughout its entire length, allowing nuts or other threaded components to be installed at any point. Its corrosion resistance, strength, and durability in harsh environments make it suitable for applications in construction, machinery manufacturing, the chemical industry, water treatment, and marine engineering. Common grades include 304 and 316. Wanzhi Steel manufactures threaded rod in various grades, diameters, and lengths, with custom sizes available. If you are interested, please get in touch with us.

 Specification

Item	Stainless steel threaded rod
Place of Origin	Hebei, China
Standard	AISI, ASTM, DIN, JIS, GB, EN
Surface treatment	Plain, Black, Zinc plate, Hot dipped galvanized, Passivated
Length	Customers’requests
Color	Silver, Black, Yellow, Customized
Thread Direction	left hand and right hand
Customized support	OEM, ODM, OBM
Thread Type	Fully threaded, half threaded, coarse threaded, fine threaded
Aliases	Studs threaded rods, Stud Bolt Screw
Function	Used with nuts, washers, and other accessories to achieve fixation, connection, and tightening
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Cartons+plastic Bags+pallet
Certification	ISO 9001, SGS, ABS, BV
MOQ	2000PCs, 3 Tons

Features

• Corrosion Resistance: Stainless steel effectively resists corrosion from moisture, acid, alkali, and salt spray environments, making it suitable for harsh environments such as the chemical industry, shipbuilding, and marine engineering.
• High Strength and Durability: Tensile strength typically ranges from 500-800 MPa, with some models reaching higher levels, enabling them to withstand heavy loads.
• High-Temperature Resistance: Mechanical properties and corrosion resistance are maintained in high-temperature environments, with some models (310S) maintaining stable performance from -269°C to high temperatures.

• Low-Temperature Toughness: Austenitic stainless steels (304L and 316L) maintain excellent impact properties at low temperatures and lack a ductile-brittle transition temperature, making them suitable for low-temperature applications such as polar engineering.
• Fatigue Resistance: The densely distributed threads ensure uniform stress distribution, making them suitable for environments with frequent vibration or cyclic stress, such as those found in aerospace hydraulic systems.
• Aesthetics and Cleanability: The smooth, easy-to-maintain surface, coupled with a metallic luster, meets aesthetically pleasing requirements in architectural decoration, household goods, and other applications.
• Hygienic Performance: Upgraded materials prevent chromium plating from fading, meeting hygiene standards in food and medical applications.

Weight calculation formula

Theoretical weight formula

Weight (kg) = [π × threaded rod diameter (m)² × threaded rod length (m) × stainless steel density] / 4

• Density of 304 stainless steel: approximately 7930 kg/m³.
• Density of 316L stainless steel: approximately 7980 kg/m³.
• General approximate value: 7850 kg/m³ (applicable to ordinary steel; fine adjustments may be made for stainless steel).

 

Simplified formula

Weight (kg) = diameter (mm)² × length (m) × 0.00623

Parameter Description:
The coefficient of 0.00623 is derived based on the density of stainless steel (7930 kg/m³).

D(thread diameter)	Pitch	D(thread diameter)	Pitch	D(thread diameter)	Pitch
M3	0.5	M14	2	M30	3.5
M4	0.7	M16	2	M33	3.5
M5	0.8	M18	2.5	M36	4
M6	1	M20	2.5	M39	4
M8	1.25	M22	2.5	M42	4.5
M10	1.5	M24	3	M45	4.5
M12	1.75	M27	3	M48	5
Unit: mm. Expression: D×L, e.g: M3×10 (diameter 3×length 10).

Application

Industrial Manufacturing & Mechanical Engineering

Component fastening and transmission in machine tools, automation equipment, and heavy machinery, such as equipment frame connections and screw adjustment mechanisms. In the automotive and aerospace sectors, it serves as a fastener for demanding mechanical systems.

Construction & Infrastructure

Suitable for outdoor or humid environments, such as building curtain walls, steel structure supports, and pipe fastening, such as roof supports and exterior wall mountings. It also serves as an adjustment rod or fastener in bridges and water conservancy facilities.

Chemical, Pharmaceutical, & Water Treatment

Used for connecting and fastening pipes in chemical reactors and pharmaceutical equipment, resistant to acids, alkalis, and organic solvents. In sewage treatment plants and water purification equipment, it is used for the installation of filter components and piping systems.

Marine & Outdoor Environmental Engineering

Component connections on ship decks and offshore platforms, as well as dock facility fastening, often utilize 316 stainless steel to resist seawater salt spray corrosion. It is also used for mounting brackets for photovoltaic power plants and wind turbines, as well as for outdoor advertising stands and railings.

Food, Healthcare, & Home

Equipment assembly and conveyor belt mounting in food production lines; fastening medical equipment frames and operating room instruments; and assembly of bathroom fixtures and outdoor furniture in homes.

 

Different size uses

• M3-M6: Small machinery, electronic equipment, and furniture assembly.
• M8-M12: Building construction, mechanical equipment, and automotive repair.
• M16+: Heavy industry, bridge construction, and large equipment fastening.
• #6–1/4″: Home DIY and light-duty fastening.
• 3/8″–1/2″: Construction, piping, and mechanical assembly.
• 5/8″ and above: Heavy industry, marine equipment, and oil equipment.

 

How to choose the right diameter?

• Light loads (e.g., hanging pictures, furniture): M4-M6 / #8–1/4″.
• Medium loads (e.g., brackets, mechanical components): M8-M12 / 3/8–1/2″.
• Heavy loads (e.g., steel structures, bridges): M16+ / 5/8″ and above.

Material grade

• A2 (304 Stainless Steel): Good corrosion resistance, suitable for general use (indoor/moderate environments).
• A4 (316 Stainless Steel): Higher corrosion resistance than 304 (resistant to salt water and chemicals).
• 316L: A low-carbon version of 316 Stainless Steel, used for welding applications.
• 410 Stainless Steel: Fair corrosion resistance, used in dry, low-corrosion environments, low cost.
• 303 Stainless Steel: Slightly less corrosion-resistant than 304, but with better machinability than 304, used for high-precision machined parts.

Grade	Corrosion resistance	Cost	Applicable environment	Core Advantages
304	Good	Medium	Ordinary environments, non-corrosive scenarios	High cost performance and strong versatility
316	Excellent	High	Corrosive environments such as coastal areas, high-salt environments, and chemical industries	Outstanding resistance to chloride ion corrosion
316L	Excellent	High	Welding environments, highly corrosive environments	Reduce intergranular corrosion after welding
410	Fair	Low	Dry, low-corrosion, high-strength environments	High strength, low cost

 

Mechanical property grade

Grade	Intensity Level	Nominal tensile strength lower limit (MPa)	Nominal yield strength lower limit (MPa)	Materials and Processing	Typical application scenarios
4.8	Lowest	≥400	≥320	Ordinary Carbon Steel	Furniture fixing, light bracket, low-stress structure
5.8	Low	≥500	≥400	Low Carbon Steel	Medium-load, non-critical mechanical fixation
6.8	Medium	≥600	≥480	Medium Carbon Steel	Small equipment assembly, connections with slightly higher stress
8.8	High-Intensity Entry	≥800	≥640	Alloy Steel (Quenched and Tempered)	Mechanical structure, steel structure connection, heavy load fixation
10.9	High	≥1000	≥900	High-Strength Alloy Steel	Automobile engines, heavy machinery high-load parts
12.9	Highest	≥1200	≥1080	High-Quality Alloy Steel (Precision Machining)	Aerospace, high-voltage equipment, extreme heavy-load scenarios

 

Illustrate:

• Strength calculation formula: Tensile strength = first digit × 100 MPa; Yield strength = product of two digits × 10 MPa.
• Higher grades require stricter material purity and heat treatment processes (such as quenching and tempering), resulting in higher costs.

Diameter representation

Metric Diameter Notation

The nominal diameter (major diameter) of a thread is directly indicated by the letter “M” prefix, followed by the diameter value (in mm). For example, M10 indicates a stainless steel threaded rod with a nominal diameter of 10 mm.

Inch Diameter Notation

The diameter is expressed as a fraction or decimal in inches. This is often combined with the thread thread number (TPI) to distinguish between coarse and fine threads, but the diameter itself is indicated separately. Common diameters include 3/8″ (0.375″), 1/2″ (0.5″), 5/8″ (0.625″), 3/4″ (0.75″), and 1″ (1″), etc.

Thread type

Classification by tooth pitch

• Coarse threads: (UNC in the US and BSW in the British standard) have fewer threads per inch, a shallower thread profile, a thicker root, greater shear resistance, and faster assembly. Examples include automotive chassis bolts and agricultural machinery connections.
• Fine threads: (UNF in the US and BSF in the British standard) have more threads per inch, a deeper thread profile, a larger thread contact area, and are naturally anti-loosening and have excellent fatigue resistance. They are used in precision engineering applications, such as hydraulic system fittings and optical equipment adjustment screws. The ultra-fine UNEF thread is primarily used in the North American market.