BRASS SCREWS,  BRASS COLD FORGED SCREWS

Brass cold forged screws are fasteners whose heads and basic shanks are formed by cold heading. External threads can be rolled where the alloy, design and equipment permit. Cable Glands India reviews drawings for electrical OEMs, EPC contractors, utilities and distributors requiring brass machine screws, terminal screws and panel hardware with defined drive, point, finish and assembly fit. The drive and the bearing surface are as important to the purchase specification as the thread.

Price: US$ 16/kg

Detailed product overview

Machine screws for tapped components

Machine screws enter an already threaded component or are paired with a nut. The screw length and usable full thread determine how far the joint engages. Specify the length datum for each head style. A countersunk screw commonly uses a different length datum from a pan head screw. Review the maximum permissible projection behind the assembly. Keep the end chamfer and incomplete threads out of the engagement calculation.

Pan, round and truss heads

A pan head offers a raised profile and flat bearing underside. A round head suits designs calling for a domed envelope, and a truss head can offer a wider bearing footprint under shallow clearance. Confirm screwdriver access above the installed device. Specify head height, bearing diameter and recess depth together. Where the screw bears on an insulator, evaluate surface pressure and distortion.

Countersunk and raised countersunk screws

The conical underside locates against a compatible countersink. Match the actual included angle to the mating drawing. An edge contact can shift the head height and create a visible gap even when torque is achieved. Define flushness or permitted projection after tightening. Verify that the recess does not break through the head on the shallowest permitted countersunk geometry.

Terminal and clamping screws

In a terminal block, a screw can act on a pressure plate, cage or conductor as intended by the approved joint. Point geometry and surface condition affect the load path. Choose a flat, radiused or otherwise specified end in conjunction with the contact design. Repeated tightening, tool access and finish influence installation behavior. Include the terminal or an approved fixture for functional checks.

Socket, slotted and cross-recess drives

A slotted drive requires a controlled slot width and depth. Cross recesses and internal drives need a declared profile and matching tool. Confirm recess size, depth and orientation if the screw will be fed automatically. Tool engagement, cam-out and forming feasibility change with head volume and alloy. Select recess gauges or an assembly test that correspond to the intended drive.

Captive, thread-forming and set screw variants

Captive screws are retained by a reduced shank, groove or companion retainer. A thread-forming screw requires a validated hole size and parent material. Set screws may be headless and rely on point geometry, so route feasibility is reviewed individually. Wood, tapping and other special thread profiles likewise require a separate drawing review. Review insertion and removal torque where service access is required.

Key features

• Pan, round, truss, flat countersunk, raised countersunk and drawing-specific forms.
• Metric or Unified machine threads, and special profiles by feasibility review.
• Drawing-defined point, recess, slot or external drive; approved driver where critical.
• Thread gauges, recess fit, head dimensions, seating and agreed torque verification.
• Drawing-based material, finish and dimensional review before tooling.

Related engineering terms and design details

Head-to-shank transition

The fillet affects both load transfer and seating. An underhead radius can contact a sharp hole edge before the nominal bearing face seats. Set the clearance at the mating part and provide an allowed radius. Inspect the transition for forming laps or tool marks where it is critical to function.

Rolled external threads

A rolled thread is displaced from a prepared shank by dies. Control blank diameter, material condition and runout. A full thread near the head may require a suitable relief or change in forming sequence. State final gauge requirements after any coating. Where a special pitch or very short threaded portion is needed, review tooling and inspection separately.

Point styles and screw start

Flat, chamfered, dog and special points each serve different assembly needs. A controlled lead chamfer helps locate a screw in a tapped hole. A dog point can locate in a groove or bore. Specify point length separately from effective engagement. Include the end condition required to protect adjacent insulation or mating surfaces.

Drive integrity under assembly torque

Specify the tightening driver, bit profile and access angle when validating the screw. Damaged bits and incorrect recess match can distort results. On soft substrates torque can increase because the screw reaches the bottom rather than because the joint is tight. Record whether the fixture uses a hard or compliant mating component.

Tin or nickel coating

Coating thickness and finish can change thread fit and driver engagement. Provide a drawing that distinguishes significant measurement surfaces from other areas. Check post-finish gauges, recess fit and seating if any are critical. Where conductivity is part of the assembly, specify the electrical test on the finished joint.

Automated screw feeding

Supply feeder and driver details along with part orientation and feed direction. Screws with wide heads, narrow shanks or captive features can overlap in a track. Check sample parts through the intended equipment before setting production release limits. Include packaging orientation and debris requirements where necessary.

Technical specifications

Brass grades and international equivalents

Use these designations as cross-reference guidance. National standards may specify different compositional limits, allowable product forms, delivery conditions and mechanical properties. The approved material specification and lot documentation govern acceptance. Review the alloy and temper for the cold work required by the drawing.

Product types and variants

Industrial applications

Manufacturing process

How to specify the part on a drawing

Start with an installed assembly view and a separate detail of the loose fastener. The assembly view identifies mating components, access for tools, neighboring parts and the required service position. The detail establishes dimensions that can be measured on incoming material. Use a section view when an internal surface, depth or transition controls fit. Give each critical dimension a datum and state whether the limit applies before or after finishing. The same dimension should have a single controlling callout. A purchase order should identify the released drawing revision and any governing specification so two suppliers can interpret the part consistently.

Feasibility of the cold forming route

The sequence starts by deciding how much metal needs to move at each die station. The finished shape is considered together with the feedstock diameter, material condition, lubricant, tool access and method of ejecting the blank. A large change in section may need multiple forming operations. Metal must be able to flow into the head or flange without producing folds at the transition. Sharp corners, narrow webs and asymmetric masses can require radius changes or a secondary operation. Where a radius is part of the application, the drawing should show which mating geometry provides clearance so it can be reviewed before tools are made.

Incoming material and lot identity

Define the alloy by designation and a material specification suitable for the incoming wire or rod. Temper, dimensions and surface condition can be as important to heading as chemical composition. Receive material with the lot identity and documentation agreed in the order. Where chemistry verification is required, specify the method and limits on the inspection plan. Verify lead and other restricted substances against the applicable customer requirement and the actual grade. Keep the incoming lot connected to the production and finishing batches so a process change or returned part can be traced. An equivalence table helps with purchasing discussions but the approved drawing and certificate govern acceptance.

Cutoff, blank development and forming

A cutoff establishes the volume available to fill the finished geometry. Consistent cutoff mass, straight feed and a sound end condition support repeatable formation. The first station can prepare a blank for a controlled upset. Later stations develop the profile, size an important diameter or create an internal recess where applicable. The tooling sequence and checks depend on the product. Trial blanks should be inspected at intermediate operations so a defect can be traced to the stage that created it. Record the approved first pieces before production and recheck the relevant characteristics after tool adjustment or replacement.

Secondary operations and cleaning

Secondary machining can establish a dimension that requires a tighter tolerance, a controlled finish or a feature that is difficult to form with an axial tool. Call out whether each functional feature may be machined or must remain as formed. Burrs at holes, grooves and transitions can interfere with plating or assembly. State the allowed edge condition rather than assuming a general deburr note gives the desired result. Use a cleaning process compatible with the finish and the end application. Check hidden recesses when they can retain lubricant, chips or debris. A finished part should be measured after the operations that can affect its fit.

Coating specification and inspection

A finish callout should identify the coating, significant surfaces, required thickness, any undercoat and the method used to verify it. The agreed acceptance condition should also address color or cosmetic appearance when the part remains visible. Internal features, recessed faces and narrow pockets can be difficult to measure. Select reference surfaces or an appropriate test section before the order is released. Specify the dimensions that must be checked after finishing and the relevant gauge condition. Use finished parts for assembly tests because friction, clearance and electrical behavior can differ from the bare part. If a coating requires masking, show the boundary on the drawing.

Quality standards, certifications and inspection

First article approval

Set the first article scope before tooling starts. A report can map measured values to numbered drawing callouts and identify the actual alloy, finish and sample lot. Use an inspection fixture that matches the drawing datums. Separate variable measurements, such as a measured height, from attribute checks, such as acceptance by a functional gauge. Confirm who approves the first article and which changes trigger resubmission. Where the result depends on a mating part, supply representative hardware or a controlled test fixture. Samples used for functional approval should identify their process route so prototype results are interpreted in context.

Production control and sampling

A control plan can identify where each characteristic is checked, how it is measured and what action follows a failed sample. High-risk characteristics may call for different checks from general dimensional features. If the purchase requires a particular sampling procedure, specify the inspection level and acceptance criteria alongside the test frequency. For automatic sorting, define the detectable defects and set up representative limit samples where appropriate. After a stoppage or tool change, identify the first-off verification needed before continuing. Keep the inspection lot linked to the accepted shipment and isolate suspect material while measurements are reviewed.

Measurement and calibration

Choose a measurement method that can resolve the drawing tolerance and reach the actual feature. Use an optical system, fixture, thread gauge or dimensional instrument according to the inspection plan. A measurement at the edge of a radius can vary with fixturing even when the part is stable, so define the measurement location. If the buyer will perform a different incoming method, compare results on the same samples before routine supply. Identify gauge size, tolerance class and condition where relevant. For disputed results, retain samples with lot records and use an agreed reference method.

Assembly validation and use limits

An assembly can fail through the receiving component, coating, fit or installation method even when every loose fastener dimension passes. Use the production-intent mating materials and the intended tools for validation. Define maximum and minimum assembly conditions where variation affects the outcome. Record the loading direction, tightening or setting sequence, and how failure is judged. For electrical equipment, distinguish a dimensional check from qualification of the equipment or verification of continuity through a finished joint. Where vibration, heat, moisture or chemicals affect performance, identify the applicable tests and acceptance criteria with the equipment designer.

Packing and incoming inspection

The packaging method should protect formed heads, edges and coating and should preserve the identity of each lot. Identify part number, revision, quantity, finish and lot information on the package where required. A buyer feeding components automatically may need an agreed cleanliness level or packing arrangement. Small mixed variations can look alike, so separate revisions, sizes and finishes in order lines and containers. Retain enough samples to compare a delivered lot with its approval data if a fit issue arises. Define the receiving inspection that will be used for subsequent deliveries and record any deviations through a controlled approval.

Engineering changes and repeat supply

When a drawing or finish changes, review the effect on dies, gauges, fixtures, sample approval and inventory. Changes in mating hardware can also affect fit even when the fastener drawing stays the same. Identify which revision a given order must receive and whether the new part is interchangeable with current stock. Avoid mixing revisions in the same container unless the customer has agreed to it. On repeat orders send the released documents and reference the approved sample or inspection plan. Flag any change in annual demand, application, packaging or test method when requesting updated pricing.

Why choose Cable Glands India

Cable Glands India reviews drawing-defined fasteners in Jamnagar, Gujarat, India. Request production samples and an agreed inspection plan. Enquiries are welcome from India, the United States, the United Kingdom and other export markets.

Establish the purchase baseline

Include a part number, drawing revision, exact alloy and finish code, annual requirement and anticipated release quantity in the RFQ. Flag a mandatory manufacturing route, such as an as-formed bearing seat, when it is a design requirement. State the units for dimensions and distinguish shop tolerances from functional limits. If the part replaces hardware in an installed assembly, attach the approved earlier drawing or confirm which interfaces must match it. A quantity estimate is useful for tooling review, and lot size helps determine a sensible inspection and delivery plan. Keep samples identified by revision when multiple alternatives are submitted.

Separate dimensional and functional approval

Use dimensional inspection to confirm the component detail. Use an approved assembly fixture or representative mating parts to verify the performance expected in service. Put the numeric criterion, test method and acceptance condition on the purchase documents. Test reports should identify whether samples are bare or finished and whether fixtures reproduce the receiving part. If production tooling is required to reproduce a feature or material condition, qualify parts from the actual tool sequence. Confirm whether any tested or sectioned specimens are retained for records or excluded from the delivery quantity.

Confirm supply scope with the quote

The listed rate gives purchasing teams a common reference in USD per kilogram. A formal quotation identifies the drawing, alloy, finish, inspection scope, volume and any tooling or sample charges. State the destination and packing requirement to align the quote with the delivery program. If parts are supplied in piece counts, agree on the pricing and shipment units to avoid conversion differences. Identify any documentation that must travel with each lot. Cable Glands India can review the part and related fasteners as one enquiry while keeping each drawing revision and acceptance requirement separate.

Frequently asked questions

Which length datum should I use?

Use the chosen product standard or drawing. Declare overall length for countersunk forms when applicable and underhead length for the specified raised head.

Are the threads rolled?

Rolling is considered for compatible geometries and material conditions. Define the result and any process requirement on the drawing.

Can one screw fit several drivers?

Choose the exact drive profile and tool. Similar-looking cross recesses may require different bits.

How is a terminal screw point specified?

Identify point profile, radius, length and the component it bears against. Provide the assembly torque or verification method.

Can you make self-tapping brass screws?

Submit the thread profile and substrate data. Validate insertion, strip and removal behavior in the real joint.

Does plating change the required driver size?

A properly controlled finish should preserve the specified fit. Gauge the recess after plating where drive engagement is critical.

What is a captive screw?

A screw retained by a reduced shank, groove or separate retainer so it stays with the panel when released.

Can you quote both plain and plated screws?

Yes, identify each finish as a distinct revision or line item and supply the target coating thickness and test requirements.

What is the listed price?

US$ 16/kg is the listed rate. Send geometry, material, finish and volume for a drawing-based quotation.

Equivalent product and related terms

Related brass fasteners and parts

• Brass Cold Forged Parts and Cold Forged Components
• Brass Cold Forged Nuts
• Brass Cold Forged Rivets
• Brass Cold Forged Bolts
• Special Brass Cold Forged Fasteners
• Screws, Nuts, Bolts & Fasteners

Request a quotation

Send your drawing, alloy, finish, order volume and delivery destination. Include mating parts, inspection requirements and approval schedule.

Request a quote from Cable Glands India