Brass Threaded Studs – Stud Bolts | Manufacturer & Exporter from India
We are one of the leading manufacturers, suppliers and exporters of Brass Threaded Studs from India. We have been supplying Brass Threaded Studs and Brass stud bolts to the world market for 3 decades. A Brass threaded stud is a cylindrical fastener with external threads on one or both ends (and sometimes continuous full-body threading), designed to be screwed permanently into one component while accepting a nut on the exposed end for assembly and disassembly. Brass threaded studs are widely used in electrical terminals, transformer bushings, earthing assemblies, circuit breaker connections, automotive components, plumbing manifolds, and precision mechanical assemblies where Brass’s combination of good electrical conductivity, corrosion resistance, and machinability is essential. Our Brass Threaded Studs are manufactured to DIN 835, DIN 938, DIN 939, DIN 976, ANSI/ASME B18.31, IS 6739, and JIS B 1173 standards, with metric, UNC, UNF, BSP, and custom thread profiles available. ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certified, we deliver consistent quality to OEMs, electrical equipment manufacturers, and distributors across Europe, North America, and the Asia-Pacific region.
Overview
Brass Threaded Studs — also called Brass stud bolts, Brass double-ended studs, Brass all-thread studs, Brass terminal studs, or Brass press-in studs — serve a critical function in assemblies where one end of a fastener must remain permanently fixed while the other end requires repeated assembly and disassembly. This design avoids the wear and damage to the parent component’s internal thread that would result from repeatedly threading a bolt in and out.
The most common configurations of Brass threaded studs are: Double-ended studs (DIN 938/939) — with one short end (plant end) for installation into a tapped hole and one long end (nut end) for accepting a nut; Fully threaded studs (DIN 976 / B7 type) — with continuous threading along the entire body length, used as through-bolts or as cut-to-length connection studs; Single-ended studs — threaded on one end with a plain or shouldered shank; and Knurled/press-in studs — with a knurled or barbed shank pressed into a parent material for blind-side fastening in sheet metal or PCB assemblies.
In transformer and switchgear applications, Brass threaded studs serve as terminal connectors where the bushing stud accepts cable lug nuts from multiple conductors. In earthing and grounding systems, Brass terminal studs are pressed into Copper busbars. In plumbing and HVAC manifolds, Brass studs connect multiple valve bodies or distribution headers. The versatility of Brass threaded studs — covering electrical, mechanical, and fluid system applications — makes them one of the most frequently specified Brass components in industrial procurement.
| Standard | Grade | Cu% | Pb% | Zn% | Tensile Strength | Remarks |
|---|---|---|---|---|---|---|
| India IS 319 | Grade 1 (CW614N equivalent) | 57–59 | 2.5–3.5 | Bal. | 340–400 MPa | Standard machining grade |
| Europe EN 12164 | CW614N (CuZn39Pb3) | 59 | 3.0 | Bal. | 350–420 MPa | Standard CNC bar stock |
| Europe (Naval Brass) | CuZn36Sn1Pb / CW712R | 62–64 | 0.2–0.6 | Bal. | 370–450 MPa | Superior marine corrosion resistance |
| USA ASTM B16 | C36000 | 60–63 | 2.5–3.7 | Bal. | 345–415 MPa | US standard free-cutting Brass |
| USA ASTM B124 | C37700 (Forging Brass) | 58–61 | 1.5–2.5 | Bal. | 340–400 MPa | For hot-forged studs |
| UK BS 2874 | CZ121 / CZ122 | 57–59 | 2.5–3.5 | Bal. | 340–400 MPa | British standard |
| Germany DIN | Ms58 / CuZn39Pb3 | 57–60 | 2.5–3.5 | Bal. | 340–420 MPa | German standard, DIN 17660 |
| Japan JIS H 3250 | C3604 | 59–63 | 1.8–3.7 | Bal. | 335–400 MPa | Japanese OEM grade |
| China GB/T 4423 | HPb59-1 / HPb59-3 | 57–61 | 1–3 | Bal. | 320–390 MPa | Chinese equivalent |
| High Conductivity | Tellurium Copper (C14500) | 99.5+ | — | — | 220–350 MPa | For electrical terminal studs requiring >90% IACS |
Manufacturing Process
Brass Threaded Studs are manufactured by CNC turning from Brass hex bar or round bar stock. The process begins with bar stock feeding into CNC turning centers, where the required diameter is turned to tolerance, and both ends are threaded using precision CNC thread-cutting or thread-milling cycles. For double-ended DIN 938/939 type studs, the different pitch ends (plant end shorter pitch, nut end coarser pitch) are cut in two separate operations with precise thread length control. For fully threaded studs (DIN 976), Brass rod is threaded along its full length on a thread-rolling machine or CNC thread mill. Knurled press-in studs are manufactured with a knurled mid-section produced by knurling tools on the CNC lathe. After threading, all studs are deburred, cleaned, and inspected using go/no-go ring gauges for external threads and laser micrometers for shank diameter. Plating (nickel, tin, silver) is applied post-machining as required.
Key machinery used: CNC Swiss-type lathes (Star, Citizen), CNC turning centers (Mazak, Fanuc), thread-rolling machines, CNC thread mills, knurling tools, vibratory deburring systems, electroplating lines, CMM dimensional verification.
| Thread Dia. (d) | Pitch (mm) | Standard Lengths (mm) | Thread Class | Min. Tensile Load (kN) |
|---|---|---|---|---|
| M4 | 0.7 | 10, 16, 20, 25, 30 | 6g | 2.9 |
| M5 | 0.8 | 16, 20, 25, 30, 40 | 6g | 4.6 |
| M6 | 1.0 | 20, 25, 30, 40, 50 | 6g | 6.8 |
| M8 | 1.25 | 25, 30, 40, 50, 60, 70 | 6g | 12.2 |
| M10 | 1.5 | 30, 40, 50, 60, 80, 100 | 6g | 19.3 |
| M12 | 1.75 | 40, 50, 60, 80, 100, 120 | 6g | 28.0 |
| M16 | 2.0 | 50, 60, 80, 100, 120, 150 | 6g | 50.2 |
| M20 | 2.5 | 60, 80, 100, 120, 150, 200 | 6g | 78.7 |
| M24 | 3.0 | 80, 100, 120, 150, 200 | 6g | 113.5 |
| M30 | 3.5 | 100, 120, 150, 200, 250 | 6g | 179.1 |
International Standards
Brass Threaded Studs are manufactured to DIN 835 (Studs – End Double Studs, metric), DIN 938 (Studs – Plant End One Diameter), DIN 939 (Studs – Plant End Two Diameters), DIN 976-1 (Threaded Rods, metric), ANSI/ASME B18.31.1 (Continuous-Thread Studs), ANSI/ASME B18.31.2 (Fastener Studs), JIS B 1173 (Studs with Nuts), and IS 6739 (Double-ended Studs). Thread tolerances follow ISO 965-1 (metric) and ASME B1.1 (unified inch).
Plating and Finish
Brass Threaded Studs are supplied in natural Brass finish as standard. Nickel plating (electrolytic or electroless) is the most widely specified finish for corrosion resistance and appearance. Silver plating is specified for electrical terminal studs where maximum conductivity at contact surfaces is required (silver’s conductivity is the highest of all metals, providing lower contact resistance than bare Brass). Tin plating improves solderability for PCB and electronics assembly studs. Chrome plating is available for decorative or hydraulic applications. Passivation and lacquer coating preserve natural Brass colour.
Tolerances
External thread tolerance class 6g (metric, ISO 965) or 2A (unified, ASME B1.1) as standard. Tighter 4g/6g or 3A available on request. Shank diameter tolerance: h9 (ISO 286). Length tolerance: ±0.5 mm for lengths up to 100 mm; ±0.8 mm for lengths above 100 mm. Straightness: max 0.2 mm per 100 mm of length. All studs are 100% ring-gauged for thread compliance.
Industries Served
Brass Threaded Studs are specified in transformer and switchgear terminal assemblies, power distribution panel boards, earthing and grounding electrode connections, plumbing manifolds and valve bodies, automotive engine and transmission assemblies, marine propulsion and deck hardware, precision instrumentation, medical devices, electronic PCB standoff connections, solar inverter terminal blocks, and HVAC system connections.
Turnaround Time
Standard DIN 976 fully threaded studs in common sizes M6–M20 and lengths up to 150 mm are available from stock. Custom sizes, DIN 938/939 double-ended types, or non-standard lengths have a lead time of 4–6 weeks from order confirmation and drawing approval.
Why Choose Us
Our three-decade track record of supplying precision Brass Threaded Studs to electrical equipment OEMs, transformer manufacturers, and industrial fastener distributors globally reflects our commitment to quality and consistency. We offer full custom capability — including non-standard diameters, compound thread ends (different thread specifications on each end of the same stud), undercut waist sections, and combined knurled/threaded profiles. Our vertical integration (bar procurement, machining, threading, plating, inspection, and export in-house) allows us to deliver with minimal lead times and maximum traceability. Custom packaging with customer branding is standard for our distribution partners. We are ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certified.
Customer Testimonials
“We source Brass transformer terminal studs from Cable Glands India in silver-plated finish for our transformer production. Their dimensional accuracy and plating quality have been consistently excellent. Lead times are predictable and their technical team understands exactly what we need without lengthy back-and-forth.”
— Andreas Fischer, Technical Procurement, Germany
“Cable Glands India manufactured custom double-ended Brass studs to our proprietary drawings for a medical device application. They produced first-article samples within three weeks, passed our dimensional inspection 100%, and have been in production ever since. Excellent partner.”
— Emma Thompson, Supply Chain Director, United Kingdom
Frequently Asked Questions (Q&A)
Q1: What is the difference between DIN 938 and DIN 939 Brass studs?
DIN 938 studs have the plant end (installation end) with the same thread pitch as the nut end. DIN 939 studs have the plant end threaded with a finer pitch than the nut end, providing a more secure installation in the parent component’s tapped hole.
Q2: Can you manufacture Brass studs with left-hand threads on one end?
Yes, we manufacture studs with left-hand external threads on one or both ends as required by the application, for example in differential assemblies or locking mechanisms where counter-rotation must be avoided.
Q3: What is the recommended hole size for press-in knurled Brass studs?
Press-in knurled stud OD is typically 0.2–0.4 mm larger than the hole diameter to achieve the required interference fit. Exact fit depends on parent material; for aluminium panels the interference is typically 0.1–0.2 mm per side, for plastic 0.3–0.5 mm per side.
Q4: Why is silver plating specified for electrical terminal studs?
Silver has the highest electrical conductivity of all metals and the lowest contact resistance when joining conductors. Silver-plated Brass terminal studs minimise voltage drop at busbar connections in high-current transformer and switchgear applications.
Q5: What is the maximum operating temperature for Brass threaded studs?
Brass retains approximately 85–90% of its room-temperature tensile strength up to 150°C. For higher temperatures, Stainless Steel or Copper-Nickel alloy studs are recommended. In electrical transformers where stud temperature may exceed 100°C, we recommend nickel-plated Brass for added thermal and corrosion resistance.
Q6: Can you supply Brass studs with metric thread on one end and UNC/UNF on the other?
Yes, compound thread studs with different thread forms on each end (e.g. M10 metric one end, 3/8″-16 UNC other end) are a speciality of ours and widely used in adaptor and conversion fittings. Please provide your specification or drawing for quotation.
Q7: What is the difference between a stud bolt and a threaded rod?
A stud bolt (DIN 938/939) is a precision-machined fastener with defined thread lengths and a controlled shank, designed to be installed into a specific tapped hole. A threaded rod (DIN 976) is a general-purpose continuous-thread bar sold in standard lengths and cut to size. We manufacture both.
Q8: Do you offer Brass terminal studs for switchgear and busbar connections?
Yes. We specialise in Brass terminal studs for busbar connections, with flat-base, hexagonal-base, or weld-nut base configurations. These are widely used in MCB distribution boards, busbar chambers, and LV switchgear panels.
Q9: Can you match a competitor sample?
Yes, we regularly manufacture to customer samples. Please provide the sample along with required quantity and tolerance expectations, and our engineering team will reverse-engineer and produce matching components.
Q10: What thread class is standard for your Brass threaded studs?
External threads are manufactured to 6g class (metric) or 2A class (unified) as standard — a medium-fit tolerance class that provides reliable fit with standard nuts. Tighter 4g tolerance is available on request for precision applications.
Q11: Do you supply Brass threaded studs for solar panel mounting systems?
Yes. We supply Brass and Stainless Steel threaded studs for solar panel frame mounting, inverter terminal connections, and earthing assembly applications in solar installations globally.
Q12: Can Brass studs be used in marine environments?
Standard free-cutting Brass (CW614N) offers good corrosion resistance in marine environments but may be subject to dezincification in highly aggressive salt water. For marine use, we recommend dezincification-resistant (DR) Brass (CW608N) or Naval Brass (CW712R) studs for extended service life.
Q13: What is the torque rating for Brass threaded studs?
Torque values depend on thread size, engagement length, and material. As a reference, M10 Brass studs (CW614N) installed into Brass tapped holes achieve a recommended installation torque of approximately 25–35 Nm. Precise values depend on lubrication and assembly conditions; our engineering team can advise on specific applications.
Q14: Do you make Brass anchor studs for concrete and masonry?
We manufacture Brass anchor studs and Brass sleeve anchors for embedding in concrete and masonry, widely used in electrical grounding earthing systems. Please see our Brass Anchors product page for full details.
Q15: How do I specify a Brass threaded stud order?
Please specify: (1) Thread diameter and pitch (e.g. M10 × 1.5), (2) Type (fully threaded / double-ended DIN938 / DIN939), (3) Total length and thread lengths on each end if applicable, (4) Material grade, (5) Finish, (6) Quantity, and (7) Any special requirements (tolerance class, inspection documents, etc.). Send to sales@cableglandsindia.com for a prompt quotation.
Glossary of Terms
Thread class 6g – ISO external thread tolerance class for medium fit applications; the standard class for Brass studs and bolts. Plant end – The end of a double-ended stud that is permanently installed (screwed or pressed) into the parent component. Nut end – The exposed end of a double-ended stud that accepts a nut for assembly/disassembly. Knurling – A cross-hatched or diamond-pattern surface texture machined or rolled onto the shank of press-in studs to increase grip when pressed into a parent material. Silver plating – An electrodeposited coating of silver (minimum 10–25 µm) applied to terminal studs to reduce contact resistance and improve conductivity at electrical connections. Dezincification – A form of corrosion in which zinc is selectively leached from Brass in aggressive aqueous environments, leaving a porous copper residue; prevented by using DR (dezincification-resistant) Brass alloys.
Related Parts
Brass hex bolts, Brass hex nuts, Brass DIN 934 nuts, Brass lock nuts, Brass coupling nuts, Brass plain washers, Brass spring washers, Brass shim washers, Brass machine screws, Brass socket head cap screws, Brass all-thread rods, Brass anchor bolts, Brass terminal lugs, Copper terminal studs, Brass busbar connectors, Brass earthing studs, Brass hanger bolts
Request a Quote Today
For Brass Threaded Studs in standard DIN or ANSI sizes or fully custom specifications, reach out to our experienced technical sales team. We provide competitive pricing, fast turnaround, and material certificates as standard. Email: sales@cableglandsindia.com | Phone: +91-22-43449300. ISO 9001:2015 | ISO 14001:2015 | ISO 45001:2018 certified manufacturer and exporter from India.