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CNC Turned SS 316 Marine Propeller Shaft with Taper Accuracy +/-0.02mm and Ra 0.4 Surface Finish

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CNC Turned SS 316 Marine Propeller Shaft with Taper Accuracy +/-0.02mm and Ra 0.4 Surface Finish

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Описание продукта

Подробная информация

Материал:

SS 316

Точность конусности:

+/- 0,02 мм

Поверхностная обработка:

Ra 0,4 (шея подшипника), Ra 0,8 (конус)

Прямолинейность:

<0,05 мм ППИ

Точность шпоночного паза:

+/-0,02 мм позиционно, параллельность 0,01 мм/100 мм

Максимальная длина:

3500 мм

Описание продукта

CNC Turned Stainless Steel 316 Marine Propeller Shaft

A propeller shaft is one of the few CNC-turned parts where the cost of failure isn't measured in warranty claims—it's measured in rescue operations. When that shaft snaps 40 nautical miles offshore because of a stress riser nobody caught at final inspection, your customer doesn't call customer service. They call the Coast Guard.

Marine propeller shafts live in a brutal environment. Constant torque loading, cyclic bending from hull flex, saltwater corrosion on the outside, and the occasional grounding impact transmitted through the drivetrain. The shaft runs inside a stern tube packed with grease or flooded with seawater-lubricated bearings, so the surface finish matters—rough finish equals accelerated bearing wear, which means vibration, which means everything else starts loosening up.

We turn these in 316 stainless for a reason. Yes, 304 is cheaper and most marine catalogs list "marine grade" without specifying which one. But 304 in a stern tube application? You're betting that the shaft will never see temperatures above 60°C and the chloride concentration will stay below 200ppm. In open ocean water, chloride runs 19,000-35,000ppm. 304 will pit. 316 will last.

The real engineering challenge on a propeller shaft isn't the turning—it's the taper. Most marine shafts have a SAE taper or a keyway taper for the propeller hub, and that taper has to be within 0.02mm of the drawing spec across its full length. If the taper is off, the propeller doesn't seat flat, the hub loosens under load, and you get fretting corrosion between the hub and the taper. That's how you end up with a prop falling off mid-voyage.

Key Features

Taper Accuracy: SAE taper and custom taper profiles held to +/-0.02mm—verified with taper gauges on every piece
Surface Finish: Ra 0.4 or better on bearing journal surfaces, Ra 0.8 on taper surfaces—critical for bearing life
Material: SS 316 bar stock from certified mills, with full MTR and chloride pitting resistance certification
Straightness: <0.05mm TIR over the full shaft length—verified between centers on a V-block
Keyway Precision: Milled keyways with positional tolerance +/-0.02mm, parallelism 0.01mm per 100mm
Corrosion Protection: Passivation per ASTM A967, optional electropolish for maximum surface integrity

Technical Specifications

Product Name	CNC Turned Stainless Steel 316 Marine Propeller Shaft
Material Options	SS 316, SS 316L, 17-4 PH (high strength)
Tolerance	+/-0.01mm (journal diameter), +/-0.02mm (taper), 6H thread tolerance
Surface Treatment	Passivation (ASTM A967), electropolish optional
Max Length	3500mm (single piece), longer with coupling
Certifications	ISO 9001:2015, IATF 16949, RoHS, CE, REACH
Lead Time - Prototype	5-10 days
Lead Time - Production	10-20 days (10-100 pcs), 20-30 days (100+ pcs)
MOQ	1 piece (prototype), 10+ (production)
Origin	Dongguan, China

Applications

Recreational Marine: Propeller shafts for sailboats, motor yachts, and fishing vessels from 20ft to 80ft
Commercial Vessels: Heavy-duty shafts for workboats, tugs, passenger ferries, and coastal cargo vessels
Naval Auxiliary: Precision shafts for patrol boats, research vessels, and coast guard craft
Dive Boat & Charter: Replacement and upgrade shafts for high-cycle commercial dive operations
Outboard Lower Units: Intermediate shafts and driveshaft components for marine propulsion systems
Ship Thruster Systems: Precision shafts for bow thrusters and stern thrusters

Why Choose Sinbo Precision

Taper Expertise: We don't just turn tapers—we verify them with calibrated taper gauges. The propeller hub fit is non-negotiable
Long Shaft Capability: Our turning centers handle shafts up to 3500mm between centers. We use steady rests to maintain straightness on long, thin shafts
Surface Finish at Scale: Ra 0.4 on a bearing journal is achievable on one piece. Achieving it on 50 pieces, every time, requires controlled tooling and coolant strategy—that's what we do
Marine Material Knowledge: We know 316 vs 316L vs 17-4 PH for marine. We'll tell you which one fits your application, even if it's the cheaper option
Straightness Guarantee: Every shaft gets checked between centers before shipping. If the TIR exceeds 0.05mm, it doesn't leave our shop

Manufacturing Process

Design Review: We review your shaft drawing for taper angle compatibility with SAE standards, keyway location relative to stress concentration zones, and surface finish requirements for your bearing system
Material Procurement: SS 316 bar stock from certified mills, tested for chemical composition and mechanical properties. Oversized stock for cleanup allowance
Precision Turning: Rough turn between centers with steady rest support for long shafts. Finish pass with insert tooling selected for 316 machining—sharp edge, proper rake, and no built-up edge
Keyway Milling: CNC milled keyways with end mills ground to match your keyway width. Positional accuracy verified with pin gauge
Grinding (if required): Cylindrical grinding for critical journal surfaces requiring Ra 0.2-0.4
Passivation & Inspection: ASTM A967 passivation, dimensional verification with micrometers and taper gauges, straightness check between centers

Frequently Asked Questions

Q: Do you make shafts longer than 3500mm?

A: For single-piece shafts, 3500mm is our max turning length. Beyond that, we can machine shaft sections with precision coupling flanges for field assembly. Most vessels under 100ft work within this range.

Q: What's the difference between 316 and 316L for propeller shafts?

A: 316L has lower carbon (<0.03%) which helps with weldability—important if you need to weld a coupling flange. For a solid bar shaft with no welding, standard 316 is fine and slightly stronger. The corrosion resistance difference in seawater is negligible.

Q: Can you balance the shaft?

A: We do static balance by default. Dynamic balancing requires specialized equipment—we coordinate with a qualified balancing shop if your application needs it.

Q: What taper standards do you support?

A: SAE J487 (standard marine taper), SAE J611, and custom taper angles per your drawing. Send us your propeller hub spec and we'll confirm compatibility.

Q: Do you supply coupling flanges with the shaft?

A: Yes. We can machine the shaft with integral flanges or supply separate flange couplings. For flanged connections, we verify flange face flatness to <0.05mm.

Q: How do you protect the shaft surface during shipping?

A: VCI (Vapor Corrosion Inhibitor) wrapping in sealed bags, with wooden cradles to prevent point contact damage. We've shipped shafts to Australia and Europe without surface issues.

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Sinbo Precision Mechanical Co., Ltd.

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части cnc механические

Части для свинцовых станков

Части для фрезеровки с ЧПУ

Обслуживания CNC подвергая механической обработке

Ковка вхолодную части

Части для фрезерной обработки с помощью CNC

Части из алюминия

Части нержавеющей стали CNC

Части CNC латунные

CNC штемпелюя части

Обработка пластиковых деталей

Гнуть части металлического листа

Новые энергетические автозапчасти

Соединители накопления энергии

Контактный терминал

Коннектор терминала батареи

Решения по производству с помощью ЧПУ

Подробная информация о продукции

части cnc механические

Части для свинцовых станков

Части для фрезеровки с ЧПУ

Обслуживания CNC подвергая механической обработке

Ковка вхолодную части

Части для фрезерной обработки с помощью CNC

Части из алюминия

Части нержавеющей стали CNC

Части CNC латунные

CNC штемпелюя части

Обработка пластиковых деталей

Гнуть части металлического листа

Новые энергетические автозапчасти

Соединители накопления энергии

Контактный терминал

Коннектор терминала батареи

Решения по производству с помощью ЧПУ

CNC Turned SS 316 Marine Propeller Shaft with Taper Accuracy +/-0.02mm and Ra 0.4 Surface Finish