DX-K Series Safety Door Lock Operation Keys

Name: DX-K Series Safety Door Lock Operation Keys
Brand: DAIDISIKE
SKU: dx-k-series-safety-door-lock-operation-keys
Availability: InStock

11-model range of fixed and adjustable operation keys for DX-W2/W3/W5 and DX-D2/D3 safety door interlock switches.

▶ Watch it in action: Safety Light Curtain + Guard-Locking Door Switch Interlock — Wiring Demo

DX-K Series Safety Door Lock Operation Keys - product photo

🔍 Click to enlarge · 1/21

Technical Specifications

Model Count	11 models (DX-K1, DX-K1D, DX-K2, DX-K2D, DX-K3, DX-K3D, DX-K4, DX-K4D, DX-K5, DX-K6, DX-K8; no DX-K7)
Compatible Switches	DX-W2 / DX-W3 / DX-W5 / DX-D2 / DX-D3
Installation (Swing Door)	R>300mm
Preparation Position (DX-W2/W3/W5)	1~3.5mm
Preparation Position (DX-D2/D3)	1~2.5mm
Key Insertion Slot Center Tolerance	±1mm
Adjustable Types	DX-K5: horizontal adjustment (angle-adjustment screw); DX-K6: horizontal/vertical adjustment; DX-K8: horizontal/vertical adjustment, operating head press 3mm to rotate 90 degrees

Overview

An operation key (also called an actuator or tongue) is the mechanical part mounted on the moving guard door that inserts into a DX-W/DX-D safety interlock switch body mounted on the fixed frame. When the door closes, the key enters the switch's key slot and allows the switch to confirm the door is closed and, on locking versions, allows the switch to mechanically or electromagnetically lock the door shut. The DX-K series is intended for machine builders, panel/guard fabricators, and maintenance engineers who need to fit or replace the actuator side of a DX-W2/W3/W5/D2/D3 safety switch on a hinged (swing) guard door.

The DX-K series is an 11-model range of mechanical operation keys (actuators) for DX-W2/W3/W5 and DX-D2/D3 safety door interlock switches, offering fixed and adjustable geometries so the key can be precisely aligned to the switch head across a wide range of hinged-door mounting conditions. Ten body variants (DX-K1/K1D/K2/K2D/K3/K3D/K4/K4D plus K5/K6/K8) span T-type, L-type, extended T-type, extended L-type geometries, and three levels of on-site adjustability.

Key Facts — DX-K at a glance

The DX-K operation key series comprises 11 models (DX-K1, DX-K1D, DX-K2, DX-K2D, DX-K3, DX-K3D, DX-K4, DX-K4D, DX-K5, DX-K6, DX-K8); there is no DX-K7 in this numbering.
DX-K keys are designed to fit the DX-W2, DX-W3, DX-W5, DX-D2, and DX-D3 safety door lock/switch bodies.
The specified key-to-slot insertion tolerance is ±1mm.
Preparation clearance before fitting is 1~3.5mm for the DX-W2/W3/W5 switch family and 1~2.5mm for the DX-D2/D3 switch family.
Hinged (swing) door installations require a minimum swing radius of R>300mm.
DX-K5 offers horizontal adjustment; DX-K6 offers horizontal and vertical adjustment; DX-K8 offers horizontal and vertical adjustment plus a press-3mm, rotate-90-degree operating head.
DX-D6 door switches use a separate RFID-coded key system (DX-K9S/DX-K9D with brackets DX-K9-L/L1/T1/T2), which is not interchangeable with the mechanical DX-K1~K8 keys.

Features & Benefits

11-Model Range Covers Fixed and Adjustable Mounting Needs

Ten body variants (DX-K1/K1D/K2/K2D/K3/K3D/K4/K4D plus K5/K6/K8) span T-type, L-type, extended T-type, extended L-type geometries, and three adjustable designs, letting the same door-lock body be paired with a key that matches the actual door/frame geometry.

Buffer-Pad Variants (D-Suffix) Absorb Door Closing Impact

DX-K1D/K2D/K3D/K4D add a rubber buffer pad to their respective base geometry (T/L/long-T/long-L), cushioning the mechanical shock each time the door closes onto the key.

Progressive Adjustability Across K5/K6/K8 for Installation Tolerance Correction

DX-K5 offers horizontal adjustment via an angle-adjustment screw; DX-K6 adds both horizontal and vertical adjustment; DX-K8 combines horizontal/vertical adjustment with a press-and-rotate head (press 3mm, rotate 90 degrees), giving installers three levels of on-site alignment correction without re-drilling the door.

Defined Insertion Tolerance Simplifies Design-In

A published key-to-slot centering tolerance of ±1mm gives design engineers a concrete number to work to when specifying door/frame machining and bracket positions.

Documented Pre-Installation Clearance by Switch Family

Preparation position is specified as 1~3.5mm for the DX-W2/W3/W5 family and 1~2.5mm for the DX-D2/D3 family, letting fabricators machine the correct standoff before the switch and key are fitted.

Minimum Door-Swing Radius Stated for Hinged-Door Applications

A published R>300mm requirement for swing (hinged) doors helps engineers confirm the DX-K key geometry is mechanically compatible with their door's arc of travel before ordering.

Cross-Compatible with the Full DX-W/DX-D Locking and Non-Locking Switch Family

The same DX-K1~K8 key range fits both the locking DX-W2/W3/W5 switches and the non-locking DX-D2/D3 switches, simplifying spare-parts stocking for sites running a mixed fleet of these switches.

Clearly Separated from the RFID-Coded Key System Used on DX-D6

DX-D6 door switches use a distinct RFID-coded key system (DX-K9S/DX-K9D) with dedicated brackets (DX-K9-L/L1/T1/T2); this is a different, non-interchangeable product family from the mechanical DX-K1~K8 keys, preventing incorrect part selection.

Applications

Hinged Guard Doors on CNC Machine Tool Enclosures — DX-K keys are designed to pair with the DX-W2/W3/W5 safety interlock switches commonly specified on machine-tool guard doors; the R>300mm swing-radius spec matches typical hinged access-door geometry.

Robot Cell Perimeter Guard Doors — Adjustable K5/K6/K8 keys allow alignment correction where perimeter fencing and door frames are field-assembled and exact key-to-switch centering can't be guaranteed at design time.

Retrofitting or Replacing a Worn/Damaged Actuator Key — Because DX-K1~K8 are a defined, standardized range tied to specific switch families (W2/W3/W5/D2/D3), maintenance staff can identify and order a like-for-like replacement rather than fabricating a custom part.

New Machine Builds Requiring Precise Door-to-Switch Alignment During Design — The published ±1mm insertion tolerance and 1~3.5mm / 1~2.5mm preparation clearances give mechanical designers concrete numbers to design the door frame and switch mounting bracket around.

Sites Standardizing Spare Parts Across Mixed W-Series and D-Series Switches — Since the same DX-K key range fits both locking (W2/W3/W5) and non-locking (D2/D3) switch families, plants can hold a smaller, shared set of key spares.

Doors with Impact/Vibration Where Cushioning Is Desired — The buffer-pad variants (K1D/K2D/K3D/K4D) are applicable where reducing mechanical shock on door closing is a design consideration.

Panel Builders Quoting Accessory/Spare-Parts Lists Alongside a DX-W/DX-D Switch Order — As an accessory line sold alongside the main switch body, the DX-K range lets integrators specify the correct actuator part number directly on the same purchase order as the switch.

Models & Ordering Information

Fixed Keys

DX-K1DX-K1DDX-K2DX-K2DDX-K3DX-K3DDX-K4DX-K4D

DX-K1 T-type, DX-K2 L-type, DX-K3 extended (long) T-type, DX-K4 extended (long) L-type; the D-suffix variant of each adds a rubber buffer pad to the same base geometry.

Adjustable Keys

DX-K5DX-K6DX-K8

DX-K5 horizontal adjustment (angle-adjustment screw); DX-K6 horizontal and vertical adjustment; DX-K8 horizontal and vertical adjustment plus a press-3mm, rotate-90-degree operating head. There is no DX-K7.

RFID-Coded Keys and Brackets (DX-D6 Only, Not Interchangeable with DX-K1~K8)

DX-K9SDX-K9DDX-K9-LDX-K9-L1DX-K9-T1DX-K9-T2

Used exclusively with the DX-D6 door switch; this is a separate RFID-coded key system with its own mounting brackets and does not fit or replace the mechanical DX-K1~K8 keys.

How to Select

Step 1: Confirm the compatible switch model, which determines the preparation position - DX-W2/DX-W3/DX-W5 (locking switches) require 1~3.5mm; DX-D2/DX-D3 (non-locking switches) require 1~2.5mm.
For hinged (swing) doors, confirm the door meets the R>300mm swing-radius requirement.
Step 2: Select the key geometry by door/frame mounting condition - use fixed keys DX-K1 (T-type), DX-K2 (L-type), DX-K3 (extended T-type, for thicker or more offset door frames), or DX-K4 (extended L-type) when the door mounting position is fixed and machining precision is controlled.
Where door closing produces noticeable impact or vibration and cushioning is wanted, choose the buffer-pad version of the matching base geometry - DX-K1D/K2D/K3D/K4D.
Where field installation has a slight horizontal deviation needing angle fine-tuning, choose DX-K5 (horizontal adjustment, angle-adjustment screw).
Where field installation has both horizontal and vertical deviation, choose DX-K6 (horizontal/vertical adjustment).
Where horizontal/vertical adjustment plus a rotatable operating head is needed for a special insertion angle, choose DX-K8 (horizontal/vertical adjustment, operating head press 3mm to rotate 90 degrees).
Step 3: Verify the installation tolerance - the key insertion slot center tolerance is ±1mm and should be held during installation/machining to ensure reliable insertion.
Do not cross-select with DX-D6 accessories: the DX-D6 door switch uses the RFID-coded key system DX-K9S/DX-K9D with dedicated brackets DX-K9-L/L1/T1/T2, a separate system that is not interchangeable with the mechanical DX-K1~K8 keys.

📘 Need the full method? How to Choose a Safety Door Switch / Interlock

When NOT to specify the DX-K — and what to use instead

The switch to be actuated is a DX-D6 guard-locking switch.

Why not: DX-D6 uses a separate RFID-coded key system (DX-K9S/DX-K9D with DX-K9-L/L1/T1/T2 brackets), which is not interchangeable with the mechanical DX-K1~K8 keys.

Use instead: DX-K9S (universal coded) or DX-K9D (uniquely coded) actuator with the matching DX-K9 bracket

The hinged door's swing radius is smaller than the published R>300mm minimum.

Why not: DX-K1~K8 installation data specifies a minimum swing radius of R>300mm for hinged-door applications.

Use instead: Consult the factory for a tight-radius mounting solution before ordering; no DX-K variant below this radius is currently cataloged

Field alignment is expected to vary by more than the fixed keys can absorb, but a fixed-geometry key (DX-K1-K4 or its D-suffix variant) is selected.

Why not: The published key-to-slot insertion tolerance is +/-1mm, and DX-K1-K4 (plus their D-suffix buffer variants) have no adjustment mechanism.

Use instead: DX-K5 (horizontal adjustment), DX-K6 (horizontal/vertical adjustment), or DX-K8 (horizontal/vertical adjustment plus rotating head)

Door closing produces noticeable mechanical shock, but a non-buffered fixed key is specified.

Why not: Only the D-suffix variants (DX-K1D/K2D/K3D/K4D) add a rubber buffer pad; the base T/L/extended-T/extended-L keys do not.

Use instead: The matching buffer-pad variant: DX-K1D, DX-K2D, DX-K3D, or DX-K4D

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Key body material
Overall key dimensions
Numeric adjustment range (mm) for the DX-K5/K6/K8 horizontal/vertical adjustment mechanisms
Mechanical load / breaking-force rating of the key body
Certificate or material-compliance documentation (e.g. RoHS)

Frequently Asked Questions

What is a DX-K key used for?

DX-K is the operation key (actuator) that mounts on the moving guard door and inserts into a DX-W2/W3/W5 or DX-D2/D3 safety interlock switch body mounted on the fixed door frame, allowing the switch to detect the door position (and, on DX-W locking versions, to lock the door).

How many DX-K models are there, and is there a DX-K7?

There are 11 models: DX-K1, DX-K1D, DX-K2, DX-K2D, DX-K3, DX-K3D, DX-K4, DX-K4D, DX-K5, DX-K6, and DX-K8. There is no DX-K7 in this numbering system, confirmed against the source PDF.

What is the difference between DX-K1 and DX-K1D?

DX-K1 is a T-type key. DX-K1D is the same T-type geometry with an added rubber buffer pad that cushions the impact when the door closes onto the key. The same D-suffix pattern applies to K2/K2D, K3/K3D, and K4/K4D.

Which DX-K models are adjustable?

DX-K5 (horizontal adjustment via an angle-adjustment screw), DX-K6 (horizontal and vertical adjustment), and DX-K8 (horizontal and vertical adjustment, plus a press-3mm-and-rotate-90-degree operating head). The other eight models (K1/K1D/K2/K2D/K3/K3D/K4/K4D) are fixed geometries.

What insertion tolerance do I need to design to?

The key must center within ±1mm of the switch's insertion slot centerline.

What preparation clearance should I leave before the switch and key are fitted?

1~3.5mm for switches in the DX-W2/W3/W5 family, and 1~2.5mm for switches in the DX-D2/D3 family.

Is there a minimum door swing radius for hinged doors?

Yes, a swing (hinged) door installation requires R>300mm.

Do DX-K1~K8 keys work with the DX-D6 door switch?

No. DX-D6 uses a separate RFID-coded key system (DX-K9S/DX-K9D) with its own mounting brackets (DX-K9-L/L1/T1/T2). This is a different product family from the mechanical DX-K1~K8 keys and the two are not interchangeable.

Can the same key range be used across both locking and non-locking switch families?

Yes, the DX-K1~K8 range is stated to fit both the locking DX-W2/W3/W5 switches and the non-locking DX-D2/D3 switches, though the preparation clearance differs between the two families - 1~3.5mm for W2/W3/W5, 1~2.5mm for D2/D3.

Are DX-K keys sold as a standalone product?

They are supplied as an accessory/spare-parts range alongside the main DX-W2/W3/W5/D2/D3 safety switch bodies, for initial fitment or replacement.

What certifications does the DX-K series hold?

Certification documents are available on request.

Works Well Together

On the same machine or line, DX-K is typically ordered together with: Safety Relays · Safety Light Curtains · Safety Mats

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