Stock Drive Products / Sterling Instrument

What Stock Drive Products / Sterling Instrument does

Stock Drive Products / Sterling Instrument (trading as SDP/SI) is a US-based private manufacturer of precision mechanical components, headquartered in Hicksville, New York, and founded in 1950. The company employs between 251 and 500 people and operates as an established, mature industrial supplier in the precision components segment. Its commercial presence is anchored by the company website at sdp-si.com, through which it serves engineering and OEM customers sourcing catalog and specialty mechanical components.

The company's product portfolio centers on precision mechanical components for power transmission and motion applications. Its most recently highlighted product is the Shaftloc® Fastening System, introduced in June 2025, a reusable two-piece fastening device engineered to mount mechanical components securely onto a shaft. The design enables quick installation, adjustment, and repositioning without damaging the shaft — a functional differentiator versus conventional shaft fastening methods such as setscrews or keyed assemblies. No additional product lines, custom engineering services, or platform-level offerings are disclosed in the available data.

SDP/SI's business model is consistent with that of a traditional mid-market industrial component manufacturer: it sells proprietary and catalog mechanical components through direct channels (notably its own e-commerce site) to engineering and OEM buyer segments. Specific pricing models, customer-segment breakdown, named customer logos, geographic end-markets, and revenue mechanics are not disclosed in the supplied data, leaving material gaps in commercial and financial characterization. No funding history, parent company, M&A activity, or leadership roster is documented in the source material.

Name

Stock Drive Products / Sterling Instrument

Website

https://sdp-si.com

Company type

Private

Founded year

1950

Headcount range

251–500 employees

Short description

Stock Drive Products / Sterling Instrument (SDP/SI) is a US-based private manufacturer of precision mechanical components founded in 1950, headquartered in Hicksville, NY, serving engineering and OEM customers via its sdp-si.com catalog and, most recently, its Shaftloc® reusable shaft fastening system.

Ownership category

akta.pro rank

Product category

Precision Mechanical Components

NAICS

Mechanical Power Transmission Equipment Manufacturing (333613), Hardware Manufacturing (332510)

SIC

Screw Machine Products (3451), Bolts, Nuts, Screws, Rivets & Washers (3452)

akta.pro primary industry

Spindles & High-Speed Drives (Machine Tool Spindles, High-speed Motors) (IMAGACAL)

Keywords

• Precision mechanical components
• Shaft fastening systems
• Mechanical drive components
• Stock drive products
• Industrial mechanical parts

Headquarters

HQ city

Hicksville

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Core offering

Stock Drive Products / Sterling Instrument (SDP/SI) is a U.S. manufacturer of precision mechanical components. The company's product portfolio includes the Shaftloc® fastening system, a reusable two-piece device designed for securely mounting mechanical components onto shafts, enabling quick installation, adjustment, and repositioning without shaft damage.

Product overview

Stock Drive Products / Sterling Instrument (SDP/SI) is a U.S. manufacturer of mechanical components. The company's product portfolio includes the Shaftloc® fastening system, a reusable device designed for securely mounting mechanical components onto shafts. The product features a simple two-piece design enabling quick installation, adjustment, and repositioning without shaft damage.

Differentiator

Problem solved

Functional benefit

Products and services

• Shaftloc® Fastening System

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Recent moves1 record

Expansion highlights1 record

Direct peers

• Thomson Industries: Thomson manufactures linear motion and mechanical motion control components including shafts, bearings, and guides — overlapping with SDP/SI's mechanical component portfolio and serving similar industrial design engineer customers.
• MISUMI: MISUMI offers configurable mechanical components including gears, shafts, and linear motion parts via a digital configurator platform. It serves the same design-engineer and small-OEM customer base as SDP/SI but with a digitally-native go-to-market model.
• PIC Design: PIC Design is a direct catalog competitor to SDP/SI, offering precision mechanical components including gears, shafts, couplings, and timing belts for design engineers and OEM applications. Both occupy the same niche of small-quantity, high-precision catalog distribution.
• Boston Gear: Boston Gear manufactures power transmission products including gears, drives, bearings, and speed reducers — directly overlapping SDP/SI's catalog of precision mechanical components for industrial buyers. Both serve OEMs and MRO customers via catalog distribution.

Broad incumbents

• Regal Rexnord: Regal Rexnord is a large diversified manufacturer of power transmission and motion control products including bearings, gears, couplings, and chain — overlapping broadly with SDP/SI's portfolio but serving a much wider customer base with global scale and brand recognition.
• SKF: SKF is a global leader in bearings, seals, and mechanical power transmission components. While broader and bearings-focused, SKF competes with SDP/SI for industrial OEM and MRO customers across overlapping mechanical component categories.
• Parker Hannifin: Parker Hannifin is a major diversified motion and control technologies provider with significant power transmission and mechanical component offerings. It competes broadly with SDP/SI across industrial OEM and aftermarket channels at significantly larger scale.

Others

• McMaster-Carr: McMaster-Carr is a broad-line industrial distributor carrying mechanical components (gears, shafts, fasteners) alongside many other categories. It is not a direct manufacturer like SDP/SI but competes for the same buyer's mechanical component spend via catalog/online channels.
• W.W. Grainger: Grainger is a major US industrial distributor carrying mechanical power transmission products. While not a manufacturer, Grainger competes for the same MRO and small-OEM procurement budgets as SDP/SI's distribution channels.

Regional players

• KHK Kohara Gear Industry: KHK is a Japanese manufacturer specializing in gears and gear-related mechanical components. It serves the same industrial catalog buyer profile as SDP/SI but is primarily Japan-focused and competes more in Asia than in SDP/SI's core US market.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

• LinkedInlinkedin.com/company/stock-drive-products-sterling-instrument---sdp-si

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stock Drive Products / Sterling Instrument