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.
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) |
Applications
Engineering vehicle service & maintenance doors
Off-road & special vehicle hatches
Agricultural & construction equipment covers
Bus & coach luggage compartment doors
RV & trailer storage compartment doors
Generator sets & outdoor equipment enclosures
Related Industries
Frequently Asked Questions
View All→References
- ISO 16750-3:2023, Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 3: Mechanical loads, International Organization for Standardization
- ASTM B117-19, Standard Practice for Operating Salt Spray (Fog) Apparatus, ASTM International
- ISO 12944-2:2017, Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments, International Organization for Standardization
How To
1. Plan the panel layout around the standard handing
The single-stage, left-hand configuration is the standard build; if the door needs right-hand actuation, raise it as a custom option at the inquiry stage rather than reworking on site.
2. Fix through Ø8.3mm holes, with threaded bosses as an option
The through-hole is the primary mount, with M8×1.25 or 5/16-18 UNC threaded bosses available; pick the threaded option where the frame cannot be drilled through.
3. Let the damper absorb the door's closing energy
The integrated damping device controls closing on heavy doors and resists vibration in harsh environments; pair it with doors heavy enough to need it, or closing feels over-damped.
4. Default to zinc-plated, upgrade to stainless outdoors
Zinc-plated steel is the standard build; move to stainless when the lock sits in corrosive or outdoor conditions — the page lists both for exactly this decision.
5. Use the dual-stage option for longer pull-in
A dual-stage option is available when the door needs more travel to reach full gasket compression; specify it with the gasket stack dimensions.
Ordering & customization terms
| MOQ from 100 pcs | details by product — ask us |
| OEM / ODM from 100 pcs | varies by product |
| Samples at actual cost | ~25 days if not in stock |
| Stock 10–15 days | production 15–20 days |
| T/T · PI in 24 h |
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