What is your minimum order quantity?

Our MOQ starts from 50 pieces per SKU, for both catalog items and custom OEM programs. Lower quantities for prototype or trial orders are negotiable — tell us about your project and we will work it out with you.

What is the typical lead time?

Standard products: 2-4 weeks. Custom projects: 4-8 weeks depending on tooling and approval process.

Do you support ODM / OEM projects?

Absolutely. Our engineering team can develop custom locks, latches and handles from concept to mass production.

Can you ship samples for evaluation?

Yes, sample orders usually ship within 3-5 business days by air courier.

How do I request a quotation?

Use the contact form or email us with product SKU, estimated quantity and target market. We reply within 24 hours.

Rotary latch

SL-4003-21 Heavy Duty Damped Manual Drive Rotary Latch

The SL-4003-21 heavy-duty manual drive rotary latch adds an integrated damping device for controlled, slam-free closing of heavy doors and panels under dependable manual actuation.

SKU : sl-4003-21 · 4003-21 · 4003/21

This Manual Drive Rotary Latch is built for heavy-duty door and panel applications requiring dependable manual actuation. The integrated damping device ensures smooth, controlled closing and resists vibration in harsh operating environments. It comes in a single-stage, left-hand configuration as standard, with a dual-stage option available. Mounting is via Ø8.3mm through holes, with optional M8×1.25 or 5/16-18 UNC threaded fasteners. The latch is supplied in zinc-plated steel, with stainless steel available for corrosive or outdoor conditions — a solid choice for OEM volume supply and custom engineering projects.

Rotary Latch Stainless Steel Damping Vibration Resistant

Key Features

Manual drive design with integrated damping — smooth, vibration-resistant closing
Single-stage configuration (dual-stage optional)
Left-hand orientation as standard
Mounting: Ø8.3mm through holes; optional M8×1.25 / 5/16-18 UNC threaded fasteners
Zinc-plated steel as standard; stainless steel optional for corrosive environments
Heavy-duty construction for demanding vehicle & industrial applications
OEM volume supply and project customization supported

Detailed Specifications

Model	Grade & Direction	Mounting Method	Drive Method	Style	Material
SL-4003-21-11	Single pole (optional double pole), right	F8.3 through hole (optional M8x1.25 thread, 5/16-18 thread)	Manual Drive	Standard	Galvanized Steel (Optional Stainless Steel)
SL-4003-21-12	Single pole (optional double pole), right	F8.3 through hole (optional M8x1.25 thread, 5/16-18 thread)	Manual Drive	with damping	Galvanized Steel (Optional Stainless Steel)
SL-4003-21-21	Single pole (optional double pole), right	F8.3 through hole (optional M8x1.25 thread, 5/16-18 thread)	Bottom Drive	Standard	Galvanized Steel (Optional Stainless Steel)
SL-4003-21-22	Single pole (optional double pole), right	F8.3 through hole (optional M8x1.25 thread, 5/16-18 thread)	Bottom Drive	with damping	Galvanized Steel (Optional Stainless Steel)