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Aluminum Screw Machine Parts
Aluminum Screw Machine Parts — Precision Turned Aluminum Components
Aluminum Screw Machine Parts are high-precision, CNC-turned and auto-screw-machined components produced from aerospace-grade aluminum alloys including 6061-T6, 6063, 2011, and 5083 series. Electrical Accessories India manufactures these parts to serve electrical OEMs, EPC contractors, panel builders, power utilities, and industrial distributors worldwide. These components are used wherever tight dimensional tolerances, lightweight construction, and excellent electrical conductivity are required — from terminal connectors and spacer bushes to standoff insulators and contact pins. Price: US$ 8.80/Kilogram
Product Overview
What Are Aluminum Screw Machine Parts?
Aluminum screw machine parts refer to turned, bored, and threaded components produced on Swiss-type CNC screw machines, multi-spindle automats, or CNC turning centers. In the electrical and power hardware industry, these include: terminal pins, contact rods, bushing inserts, grounding studs, hex spacers, connector bodies, and sleeve couplings. Materials used include: Al 6061-T6, Al 6063-T5, Al 2011-T3 (free-machining alloy), Al 5083, Al 7075 — all chosen for specific combinations of machinability, conductivity, and corrosion resistance. Parts are produced in quantities from prototype samples to high-volume production runs of several million pieces per month, making this category suitable for both spot orders and annual rate contracts for OEMs.
Key Material Grades for Screw Machined Aluminum Parts
The most widely used alloy for electrical aluminum screw parts is 2011 (also known as “free-machining aluminum”) because of its superior chip-breaking behavior, which reduces cycle times and tool wear on high-speed CNC automats. For outdoor and marine-rated applications, 6061-T6 and 5083 provide higher corrosion resistance and anodize quality. For high-conductivity electrical contacts, EC-grade 1350 aluminum alloy is specified. Heat-treated 7075-T6 is available for structural fasteners requiring maximum tensile strength. The selection of alloy grade directly impacts the final mechanical properties, surface finish quality, and suitability for secondary treatments like hard anodizing, chromate conversion coating, or tin plating.
Dimensional Range and Machining Capabilities
Our CNC screw machining facility handles bar stock diameters from 2 mm to 65 mm, with part lengths up to 200 mm in a single setup. Thread forms produced include: Metric ISO (M3 to M42), UNC, UNF, BSP, and custom specials. Bore tolerances of H7 are standard; precision ground bores to IT5 are available for close-fit assemblies. Knurling (straight, diamond, spiral), cross-drilling, milling slots, deburring, and chamfering are performed in-line on the same machine. All critical dimensions are verified using CMM (Coordinate Measuring Machine) inspection with calibrated gauges traceable to NABL/ISO 17025 standards. This capability supports production of parts with geometric tolerances of ±0.01 mm on diameter and ±0.02 mm on length.
Surface Treatment and Finishing Options
Aluminum screw machine parts are available with: Natural (degreased and bright), Type II Anodize (12–25 microns), Hard Anodize Type III (25–75 microns), Chromate Conversion Coating (MIL-DTL-5541), Electroless Nickel Plating (5–15 microns), Tin Plating (for solderability), and Zinc Phosphate (for paint adhesion). The finish selected affects the contact resistance, torque values, and long-term environmental durability of the finished assembly. Hard anodize provides dielectric breakdown voltage of 700–2000 V depending on thickness, useful for electrically isolating metallic fasteners in HV assemblies.
Application Categories in Electrical Industry
In the electrical OEM segment, aluminum screw machine parts are consumed in: LV/MV switchgear bushings and spacers, transformer terminal connectors, motor terminal blocks, cable compression lugs, earthing and grounding hardware, junction box fittings, metering equipment, and panel wiring accessories. EPC contractors and utilities source these parts for substation construction, overhead line hardware, underground cable joint kits, and switchyard earthing systems. The low mass density of aluminum (2.70 g/cm³ vs. 8.96 g/cm³ for copper) reduces hardware weight by 60–65%, a critical advantage for overhead line fittings and portable electrical equipment.
Quality and Process Controls
Each batch undergoes: incoming material verification (mill test certificate, hardness check, spectrometric chemical analysis), dimensional inspection (first-off + AQL 1.0 Level II sampling), thread gauge verification (Go/NoGo gauges to ISO 1502), surface finish Ra measurement, and final visual/packaging inspection. Non-destructive testing (dye penetrant, ultrasonic) is available for safety-critical HV components. Electrical contact resistance testing is performed per IEC 61238-1 and IEEE 837 for compression lug and terminal assemblies.
Export and Logistics
Parts are packed in anti-corrosion poly bags, partitioned trays, or bulk fibre drums. Export packing complies with ISPM-15 wood treatment standards. Shipments are via sea (FCL/LCL), air freight, and courier. Standard lead times: 3–5 weeks for new tooling + production; 2–4 weeks for repeat orders. Regular export destinations include USA, UK, EU, Middle East, Southeast Asia, South Africa, and Australia.
Key Features
- Precision CNC turning with tolerance ±0.01 mm
- Material grades: 2011, 6061, 6063, 5083, 7075, 1350 EC
- Thread forms: Metric ISO, UNC, UNF, BSP, custom
- Bar diameter range: 2 mm to 65 mm
- Surface finishes: Anodize, Hard Coat, Chromate, Nickel, Tin Plating
- In-line operations: Knurling, cross-drilling, slotting, deburring
- CMM inspection with NABL-traceable calibration
- ISO 9001:2015 certified quality management system
- REACH and RoHS compliant alloys available
Free-Machining Alloy Advantage (Al 2011)
Al 2011-T3 and T8 are the preferred alloys for high-speed screw machining because they contain controlled additions of bismuth-tin (RoHS-compliant lead-free versions) that form short, brittle chips. This reduces chip entanglement, tool wear, and cycle times on multi-spindle CNC automats running at 3,000–5,000 RPM. Parts machined from 2011 exhibit surface finishes of Ra 0.8–1.6 µm without secondary polishing, suitable for direct anodizing or plating. Common parts: contact pins, terminal insert screws, coupling nuts, and precision spacers where high throughput and tight tolerances are required simultaneously.
High-Strength Structural Grade (Al 6061-T6)
6061-T6 (UTS: 310 MPa, Yield: 276 MPa) combines machinability with structural integrity and outdoor corrosion resistance. It anodizes to a uniform, hard oxide layer providing excellent long-term protection. Common parts: grounding studs, earthing bolts, cable anchor clamps, panel mounting pillars, bus bar spacers, and substation fitting hardware. Meets ASTM B221 (extruded bar) and ASTM B209 (sheet) standards, ensuring material traceability for power utility procurement. Weldable (TIG/MIG) for assemblies needing welded extensions.
Corrosion-Resistant Marine Grade (Al 5083)
Al 5083 (4.0–4.9% magnesium) offers the highest corrosion resistance among non-heat-treatable aluminum alloys. Critical for coastal substations, offshore platforms, marine electrical fittings, and chemical plant environments exposed to saltwater spray, SO₂, or H₂S atmospheres. Specified for earthing connectors, cable clamps, and junction box fittings for offshore wind, marine substations, and oil and gas installations. Same dimensional capabilities as 6061 on our CNC turning equipment.
Hard Anodize for Wear and Isolation Applications
Hard anodize (Type III, MIL-A-8625F) produces oxide layers of 25–75 microns with Vickers hardness of 350–500 HV. Specified for parts subject to friction, abrasion, or repeated assembly/disassembly: panel-mount bushings, cable gland bodies, locating pins, and threaded inserts. Also acts as a dielectric (breakdown voltage: 700–2000 V) useful for electrical isolation of metallic fasteners in HF or HV assemblies. Final thread and bore tolerances account for anodize layer buildup (50% growth into base, 50% outward).
Custom Prototyping and NPI Support
First article inspection (FAI) reporting per AS9102 format is available for aerospace and defense OEM customers. Prototypes are produced from 2D drawings or 3D CAD models (STEP, IGES, DXF) with turnaround of 5–10 business days. Full PPAP Level 3 packages — including dimensional results, material certifications, process capability (Cpk) data, and control plans — are provided for OEM supplier qualification. This ensures smooth transition from prototype to high-volume production without quality disruptions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grades | Al 2011-T3/T8, Al 6061-T6, Al 6063-T5, Al 5083-H111, Al 7075-T6, Al 1350 EC Grade |
| Bar Diameter Range | 2 mm – 65 mm |
| Part Length | Up to 200 mm (single setup) |
| Diameter Tolerance | ±0.01 mm (IT6); precision bore to IT5 |
| Thread Standards | ISO Metric, UNC, UNF, BSP, BSPT, NPT, Whitworth |
| Surface Finish (Ra) | 0.8 – 3.2 µm standard; 0.4 µm precision |
| Hardness (6061-T6) | 95 HRB (Brinell 107 HB) |
| Tensile Strength (6061-T6) | 310 MPa |
| Conductivity (1350 EC) | ≥61% IACS |
| Quality Standard | ISO 9001:2015; AQL 1.0 Level II |
| Inspection | CMM, Thread Go/NoGo, Ra Profilometer, Spectrometric Analysis |
| Price | US$ 8.80/Kilogram |
International Alloy Equivalents
| Indian Standard | AA (USA) | EN (Europe) | JIS (Japan) | BS (UK) | DIN (Germany) |
|---|---|---|---|---|---|
| IS 64430 / HE-9 | AA 6061 | EN AW-6061 | JIS A6061 | BS 6082 | AlMgSi1 |
| IS 64432 / HE-30 | AA 6063 | EN AW-6063 | JIS A6063 | BS 6063 | AlMgSi0.5 |
| IS 64421 / HT-30 | AA 2011 | EN AW-2011 | JIS A2011 | FC1/H14 | AlCuBiPb |
| IS 54300 | AA 5083 | EN AW-5083 | JIS A5083 | NP8/5083 | AlMg4.5Mn0.7 |
| IS 64430 / HT-15 | AA 7075 | EN AW-7075 | JIS A7075 | DTD 5110 | AlZnMgCu1.5 |
Product Types and Variants
| Variant Type | Typical Application | Standard Thread/Size |
|---|---|---|
| Hex Spacers / Standoffs | PCB, panel, switchgear assembly | M3 to M16, L: 6–100 mm |
| Terminal Pins / Contact Rods | Transformer terminals, MCB contacts | Ø4–Ø25 mm |
| Grounding / Earthing Studs | Earthing busbars, MDB panels | M8 to M30 |
| Sleeve Couplings / Hex Couplings | Cable joint kits, conduit connections | M10 to M42 |
| Bushing Inserts | Transformer bushings, cable gland bodies | Custom OD/ID |
| Compression Ferrules | Cable end terminations | 10–630 mm² cable size |
| Connector Bodies | Plug and socket, DB connectors | Custom per drawing |
| Knurled Thumb Screws | Panel adjusters, hand-tighten fittings | M3 to M12 |
Applications in Industry
| Industry Segment | Typical Parts Used |
|---|---|
| Electrical OEMs (Switchgear, MCB, MCC) | Contact pins, terminal spacers, bus bar inserts |
| Power Utilities (T&D) | Earthing studs, compression lugs, line hardware |
| EPC Contractors (Substations) | Grounding fittings, cable joint hardware |
| Transformer Manufacturers | Terminal connectors, oil drain plugs, bushing fittings |
| Motor & Generator OEMs | Terminal box hardware, conduit connectors |
| Renewable Energy (Solar, Wind) | Earthing rods, rail clamps, DC cable fittings |
| Telecom & Data Center | Rack spacers, cable management fittings, earthing lugs |
| Railways & Traction | Overhead line fittings, earthing clamps, connectors |
Manufacturing Process
Raw aluminum bar stock is procured from IS-certified mills with Mill Test Certificates (MTCs) confirming chemical composition and mechanical properties. Material is loaded into CNC Swiss-type sliding headstock automats or fixed headstock turning centers. Rough machining removes material to within 0.3–0.5 mm of final dimension. Semi-finish and finish passes achieve the specified diameter tolerance (IT6/IT7). Threading is performed by rigid tapping, thread whirling, or single-point threading. In-process SPC (Statistical Process Control) charts are maintained for critical dimensions. After machining, parts undergo ultrasonic cleaning, inspection, and surface treatment as specified. Final inspection includes dimensional, visual, and electrical tests before dispatch.
Quality Standards and Certifications
| Standard | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ASTM B221 | Aluminum alloy extruded bar/rod/wire |
| IS 733 / IS 1285 | Indian Standard for aluminum alloy bars |
| IEC 61238-1 | Compression and mechanical connectors for power cables |
| IEEE 837 | Qualifying permanent connections for grounding systems |
| MIL-A-8625F | Anodic coatings for aluminum (Type II and III) |
| RoHS / REACH | Restriction of hazardous substances compliance |
Why Choose Electrical Accessories India?
- 30+ Years Manufacturing Experience in precision aluminum machined components for electrical OEMs and export markets
- Fully Integrated Facility — raw material procurement, CNC machining, surface treatment, testing under one roof
- Export-Ready Documentation — MTCs, COAs, PPAP, FAI, RoHS/REACH declarations on request
- Competitive Pricing at US$ 8.80/Kilogram — volume discounts on annual rate contracts
- Technical Support — DFM review, material selection guidance, application engineering
- Global Reach — Supplied to US, UK, Germany, Australia, UAE, Singapore, South Africa, 40+ countries
- Short Lead Times — Repeat orders in 2–4 weeks; new tooling in 3–5 weeks
Frequently Asked Questions
Q1. What is the minimum order quantity (MOQ)?
For standard turned parts (spacers, studs, pins), MOQ is typically 500–1,000 pieces. For parts requiring special tooling, MOQ may be 2,000–5,000 pieces. Prototype quantities (1–50 pieces) accepted at sample pricing.
Q2. Which aluminum alloy is best for electrical screw machine parts?
For high-volume CNC screw machining: Al 2011-T3. For outdoor/corrosion-resistant parts: Al 6061-T6. For high-conductivity electrical contacts: Al 1350 EC grade. For marine/chemical plant applications: Al 5083-H111.
Q3. Can you supply hard-anodized parts?
Yes. Hard anodize (Type III, MIL-A-8625F) in 25–75 micron thickness on 6061 and 6063 alloys. Note: 2011 alloy does not anodize well due to copper content. 6061-T6 is the recommended substrate for hard-anodized parts.
Q4. What thread standards can you produce?
Metric ISO (M3–M42), UNC/UNF (ANSI B1.1), BSP/BSPT (BS 2779), NPT/NPTF (ANSI B2.1), and custom thread forms. Thread class 6g/6H (medium fit) standard; 4h/4H (close fit) available.
Q5. Do you supply RoHS-compliant alloys?
Yes. All alloys including the 2011 series are available in lead-free (bismuth-tin) RoHS-compliant versions. Full RoHS and REACH SVHC compliance certificates provided.
Q6. What is the delivery lead time?
New parts (new tooling setup): 3–5 weeks from drawing approval. Repeat orders: 2–4 weeks. Expedited (1–2 weeks) at premium freight charge for urgent requirements.
Q7. Can you provide PPAP documentation?
Yes. Full PPAP Level 3 packages including dimensional results, MTCs, process flow, PFMEA, control plan, MSA/gauge R&R, and Cpk report. AS9102 FAI format also available.
Q8. Are parts suitable for high-voltage applications?
Yes. For HV applications (>11 kV), parts are designed with smooth, burr-free surfaces and appropriate creepage/clearance distances per IEC 60071 and IEC 60664. Hard-anodized parts provide dielectric properties up to 2,000V breakdown voltage.
Q9. What countries do you export to?
USA, UK, Germany, France, Italy, Australia, UAE, Saudi Arabia, Singapore, Malaysia, South Africa, Bangladesh, Sri Lanka, Nepal and 40+ other markets.
Q10. Can you reverse-engineer from a sample?
Yes. Using CMM measurement and optical comparators, we create a detailed inspection drawing and produce matching first articles for approval before production.
Equivalent Terms in Other Languages
| Language | Term 1 | Term 2 | Term 3 |
|---|---|---|---|
| Spanish | Piezas de torno automático de aluminio | Componentes torneados de aluminio | Partes mecanizadas de aluminio |
| Russian | Детали из алюминия токарного автомата | Точёные алюминиевые детали | Алюминиевые станочные компоненты |
| French | Pièces décolletées en aluminium | Composants tournés en aluminium | Pièces usinées aluminium |
| Portuguese | Peças torneadas de alumínio | Componentes usinados em alumínio | Peças de torno automático alumínio |
| Italian | Parti tornite in alluminio | Componenti lavorati in alluminio | Pezzi di tornio automatico alluminio |
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Request a Quote — Aluminum Screw Machine Parts
Submit your drawing (PDF/DXF/STEP) with material grade, surface finish, annual quantity, and delivery location. Technical team responds within 24 hours (IST).
Price: US$ 8.80/Kilogram | MOQ: 500 pcs | Lead Time: 3–5 weeks new / 2–4 weeks repeat
Email: info@elecaccs.com | Location: Gujarat, India | Global Exporter since 1990s
