Bolts, screws and studs
Brass bolts, terminal screws and studs, rolled or cut threads, plain or plated.
For terminals, earthing and busbar joints
Turned and machined brass parts, made to your drawing.
Brass fasteners, threaded inserts, terminal parts and turned components, in leaded, low-lead and DZR brass. Manufactured in India, threaded and inspected against your drawing, and delivered to your Incoterm.
- Leaded, low-lead or DZR
- Threads gauged
- Measured records
Moulded-in insert, M5, knurledDWG REV. A
- Material
- CW614N, CuZn39Pb3
- Finish
- Nickel plated
- Critical dimension
- Thread M5 6H
- Inspection
- Thread gauged, after plating
What we make
Nuts and washers
Hex, square, flange and terminal nuts, with plain and spring washers.
For terminal blocks and switchgear
Threaded inserts
Knurled inserts for moulding-in, heat staking or press-fit into plastic.
For MCB housings, enclosures and mouldings
Terminal and neutral links
Turned and drilled terminal bodies, neutral links and earth bars with clamping screws.
For distribution boards and terminal blocks
Earthing and bonding parts
Earth studs, clamps, rod couplers and bonding terminals.
For panels, enclosures and earthing systems
Cable gland parts
Gland bodies, seal nuts and entry threads in brass, plain or nickel plated.
For cable entries into enclosures
Choosing a brass
Free-cutting brass machines fastest. DZR and low-lead grades answer to water and to the rules on lead.
Grade for the part and the market
- Free-cutting brass CW614N
- The fastest to machine, with sharp, clean threads. The usual grade for turned parts and fasteners.Watch for: Contains about 3% lead, allowed under a RoHS exemption that is under review; check your market.
- Forging brass CW617N
- Hot forged into near-net blanks, then machined, for terminal bodies and complex shapes.Watch for: A forging die is needed; it pays back at volume.
- DZR brass CW602N
- Resists dezincification, for parts that see water, condensation or outdoor air.Watch for: Looks the same as standard brass; it must be named on the drawing.
- Low-lead brass CW510L, CW724R
- Under 0.2% lead, for customers and markets that limit lead.Watch for: Slower to machine and costs more.
Finish for the use
- Natural
- Bare brass, cleaned and passivated.Watch for: Tarnishes over time; fine inside an enclosure.
- Nickel
- Bright and corrosion resistant, the usual finish for fasteners and glands.Watch for: Plating changes the thread fit; gauge after plating.
- Tin
- For faces that carry current, such as terminal parts.Watch for: Soft, so not for faces that wear.
Specifications
- Types
- Bolts, screws and studs; nuts and washers; threaded inserts; terminal and neutral links; earthing and bonding parts; cable gland parts
- Materials
- CW614N (CuZn39Pb3); CW617N (CuZn40Pb2); CW602N DZR; low-lead CW510L and CW724R; IS 319 equivalents
- Processes
- CNC and sliding-head turning, hot forging, thread rolling, knurling, milling
- Bar diameter
- 3–60 mm standard
- Thread sizes
- M2–M24 standard
- Threads
- Metric ISO coarse and fine, UNC, UNF, BSP; gauged go and no-go to 6g and 6H
- Finishes
- Natural, nickel, tin; passivation
- Checks
- Thread gauge; critical dimensions; material grade and lead content; plating thickness
- Quantities
- Prototype builds to mass production
Which brass
Machining speed, forming and corrosion pull in different directions. The use decides the grade.
Relative ratings for guidance, from published copper alloy data. Grades named to EN 12164 and EN 12165.
Free-cutting brass, CW614N
About 3% lead. The fastest to machine, with clean threads.
Machining
3 / 3
Forming
1 / 3
Damp and water
1 / 3
Forging brass, CW617N
About 2% lead. Hot forged into blanks, then machined.
Machining
2 / 3
Forming
3 / 3
Damp and water
1 / 3
DZR brass, CW602N
Resists dezincification in water and damp air.
Machining
2 / 3
Forming
2 / 3
Damp and water
3 / 3
Low-lead brass, CW510L, CW724R
Under 0.2% lead, for markets that limit lead.
Machining
1 / 3
Forming
2 / 3
Damp and water
2 / 3
| Grade | Machining | Forming | Damp and water |
|---|---|---|---|
| Free-cutting brass, CW614NAbout 3% lead. The fastest to machine, with clean threads. | 3 / 3 | 1 / 3 | 1 / 3 |
| Forging brass, CW617NAbout 2% lead. Hot forged into blanks, then machined. | 2 / 3 | 3 / 3 | 1 / 3 |
| DZR brass, CW602NResists dezincification in water and damp air. | 2 / 3 | 2 / 3 | 3 / 3 |
| Low-lead brass, CW510L, CW724RUnder 0.2% lead, for markets that limit lead. | 1 / 3 | 2 / 3 | 2 / 3 |
Questions buyers ask
Is leaded brass RoHS compliant?+
Copper alloys with up to 4% lead are allowed under a RoHS exemption, which covers free-cutting brass. The exemption is under review, so if your market limits lead, we quote low-lead brass instead.
What is DZR brass?+
Dezincification-resistant brass. In water and damp air, zinc can leach out of standard brass and leave it weak and porous. DZR brass resists this. Name it on the drawing, because it looks the same.
Do you gauge threads after plating?+
Yes. Plating adds thickness and changes the fit, so threads are gauged go and no-go after plating, to the class on your drawing.
Moulded-in or press-fit insert: which do I need?+
A moulded-in insert gives the highest pull-out and torque strength. Heat-staked and press-fit inserts go in after moulding, which keeps the moulding cycle short. The knurl is designed for the method.
Can you match an existing part from another supplier?+
Yes. Send the drawing, and a sample if the drawing is incomplete. We tell you what can be held before we quote, then make samples for your approval.
Can you take a small order?+
Yes. Small, engineering-heavy batches are work we take, from prototype quantities upwards.
Send the drawing
Email us your enquiry at contact@qumek.com. We respond within 12 hrs.
Your enquiries are confidential with us and we proceed with manufacturing only after signing a NDA.
Need a DFM review, a prototype or a test plan before production? See the services.