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Compression fittings and cam-style locks should be compared by their documented function and mounting requirements, not by a similar-looking faceplate. Start by deciding whether the compartment needs simple closure, a specified pull-in action, keyed access or a combination of those requirements.
This guide sets out the questions to resolve before selecting hardware. It does not establish a security grade, weatherproof seal, vibration rating or transport-restraint capacity for any proposed installation.
Start with the job of the fitting
Write down what must happen when the panel closes. Does a fitting simply keep a door shut? Is a particular engagement or pull-in action required? Must access be restricted by a key? Record those separately so one feature does not stand in for another.
Do not assume that a product described as a lock is keyed, or that a compression fitting makes the complete enclosure waterproof. Ask for the selected model's operating description and drawing.
Compare what the current listings actually say
DuraSlide's Small Chrome Non-Locking Compression fitting is listed as a flush compression type with zinc-alloy material and chrome finish. Its title expressly identifies a non-locking version. Do not select it on the assumption that it provides keyed security.
The Coin Lock description states a 20 mm body length and key reference 60111. It does not provide a complete operating drawing, cam geometry, security rating or permitted installation range. Confirm the actual model configuration before treating it as equivalent to another cam-style fitting.
Keep mounting dimensions distinct
Record panel thickness, any existing cut-out, the available space behind the panel and the engagement surface. Outside diameter, body length and grip range are different dimensions; one does not establish the others.
The compression listing gives a 1–24 mm grip range and a separate 5 mm door-thickness entry. The short description does not explain the complete mounting stack or adjustment method. Obtain the drawing and clarify those entries rather than interpreting the grip range as a universal panel-thickness allowance.
Likewise, the Coin Lock's stated body length is not automatically its maximum usable panel thickness. Allow for the actual mounting components only as documented for the selected configuration.
A requirements comparison sheet
| Question | Evidence to request |
|---|---|
| What closing action is required? | Exact operating description, engagement geometry and drawing. |
| Is keyed access required? | Selected locking variant, key arrangement and any documented security classification. |
| Will it fit the panel? | Cut-out, panel range, rear clearance and mounting stack. |
| Is sealing part of the brief? | Complete door and gasket design plus relevant verified fitting information. |
| Will it travel in a vehicle? | Documented suitability and separate equipment-restraint assessment. |
Check the complete door, not just the latch
A closure works with its supporting panel, engagement point, hinges and any gasket. Distortion or an unsuitable mounting arrangement cannot be resolved simply by selecting a fitting with a different name.
Use our trailer compartment planning guide to record door movement and equipment access. If replacing a grip as well, the handle measuring guide explains why the outside dimensions and cut-out must be checked separately.
Do not substitute appearance for performance evidence
A chrome finish does not establish an environmental rating or corrosion life. A key reference does not establish resistance to forced entry. A fitting that closes a door is not automatically an approved cargo-restraint component.
Where an operating or performance requirement is important, ask for supporting documentation for the exact model and installation. If that information is missing, keep the requirement unresolved rather than borrowing a specification from another product.
Before ordering
- Identify the existing fitting and document the desired function.
- Record the panel, cut-out, rear space and engagement details.
- Distinguish non-locking and locking variants.
- Request the model drawing and clarify ambiguous dimensions.
- Resolve sealing, security and transport requirements independently.
Common questions
Is every compression fitting keyed?
No. The current DuraSlide example is named non-locking. Verify the chosen variant.
Can I choose a replacement using body length alone?
No. Check the complete drawing, panel requirements, fixing components and engagement geometry.
Does a compression label guarantee a weatherproof compartment?
No. Confirm the complete installation and any relevant documented sealing performance.
