Lenlok SP-300 Extended Spindle - 300mm x 7.6mm Square
The Lenlok SP-300 is a 300mm extended square spindle manufactured to the standard 7.6mm square profile used across a wide range of Australian lock hardware. It is designed for installations where the supplied or standard-length spindle is too short — typically arising on thick doors, aluminium-framed doors, gates, or retrofits where the door thickness or hardware stack-up pushes beyond what a factory spindle can bridge.
The SP-300 is a cut-to-length spindle, meaning it can be trimmed on-site to match any specific door thickness or hardware configuration. This makes it a practical stock item for locksmiths and tradies who regularly work across varied door profiles. It is a mechanical, passive accessory with no electronic or smart lock platform dependency — it suits any lever set, latch mechanism, or smart lock internally that accepts a standard 7.6mm square drive.
Key Features
- 300mm length — substantially longer than standard factory spindles, accommodating thick doors, gate applications, and non-standard hardware configurations where standard spindles are too short.
- 7.6mm square profile — matches the dominant Australian square spindle standard used across lever sets, latch mechanisms, and the majority of smart lock internals.
- Cut-to-length — the spindle can be cut on-site to the exact length required, avoiding the need to stock multiple fixed-length variants.
- Steel construction — provides the rigidity and longevity expected of a spindle under regular operating loads.
- Universal fit — compatible with any lock mechanism accepting a standard 7.6mm square spindle drive, regardless of brand or electronic vs mechanical type.
What's in the Box
- 1 x SP-300 extended spindle (300mm x 7.6mm square, steel)
Suitable Uses
- Thick timber or engineered doors where door thickness exceeds standard spindle reach
- Aluminium-framed doors where the hardware assembly pushes the spindle requirement beyond 60-80mm
- Gate installations requiring an extended spindle to bridge the gate frame and latch housing
- Smart lock retrofits on non-standard doors where the supplied spindle is insufficient
- Commercial or strata door retrofits where door thickness or hardware configuration varies from residential standard
- Locksmith and trade applications requiring a field-adjustable spindle stock item
Available Finish Options
Steel
(This Product)
STK SP-300
Finish selection does not affect functionality, compliance, or performance.
Full Specifications
| Brand | Lenlok |
| Model | SP-300 |
| Type | Extended square spindle |
| Length | 300mm |
| Profile size | 7.6mm square |
| Material | Steel |
| Application | Lever sets, latch mechanisms, smart lock internals |
| Cut to length | Yes - field trimmable to exact required length |
Frequently Asked Questions
Yes. The 300mm length is intentionally oversized so it can be trimmed on-site to match your exact door thickness and hardware setup. A clean cut with a hacksaw or angle grinder is sufficient — allow for correct engagement depth into both sides of the lock mechanism before marking your cut length.
Yes — 7.6mm square is the dominant standard in Australian lever sets, latch mechanisms, and the majority of smart lock internals that use a square drive. Some European hardware specifies 8mm square; always verify your lock's spindle bore before ordering.
Yes, for any smart lock that uses a square 7.6mm spindle drive internally. This is common in smart lever sets and some deadbolt-style smart locks. Check your lock's installation guide to confirm whether it uses a square spindle and what the bore size is. If you are retrofitting a smart lock onto a thick door and the supplied spindle falls short, the SP-300 is the typical solution — see also our guide on wrong spindle position as a common install mistake.
A hacksaw or angle grinder is sufficient for most steel spindles. Use a vice to hold the spindle securely during cutting. File or deburr the cut end to remove sharp edges before fitting, and ensure the cut face is square so the spindle seats cleanly in the lock hub.
Measure your door thickness, then add the depth each end of the spindle needs to engage into the lock hub on each side (typically 8-12mm per side, but confirm against your lock's installation instructions). The spindle must engage both hubs fully — an under-length spindle will result in handle slip or latch failure under load.
Additional Information
Once cut, the spindle cannot be extended. Measure door thickness and hub engagement depth carefully before trimming. A spindle that is even a few millimetres too short will result in incomplete hub engagement and unreliable handle operation. It is better to leave the spindle slightly long and recheck than to cut short.
While 7.6mm square is the Australian standard, some European-origin locks and a small number of Australian commercial fittings specify 8mm square. Always confirm your lock's spindle bore size against the manufacturer's installation guide or datasheet before purchase. For guidance on measuring your door and existing hardware, see Measuring Your Door - Door Thickness.
Warranty
Lenlok products are backed by Davcor Group Pty Ltd, distributed through Lock and Key Co. Warranty periods vary by product category:
- 5 years — door hardware, general locks, mechanical digital locks, padlocks, utility and window locks, toilet partition hardware
- 3 years — cylinders, keys, and cabinet furniture
- 12 months — electronic and digital locks
No PDF datasheet is currently available for this product. Contact Terry's if you require technical documentation.
Lenlok Warranty
Lenlok is a brand of Davcor Group Pty Ltd (ABN 95 003 562 598) — an Australian manufacturer, designer, and wholesale distributor of residential and commercial locking hardware. The Lenlok range covers door hardware, cylinders, padlocks, cabinet furniture, mechanical digital locks, and utility hardware.
Davcor distributes Lenlok through seven specialist divisions, including Lock and Key Co. — Davcor’s dedicated trade distribution arm supplying locksmiths and the security industry across Australia, New Zealand, and beyond. Whether you purchased your Lenlok product through Lock and Key Co., another trade channel, or directly through us, the same Davcor warranty applies.
All Lenlok products are guaranteed by Davcor Group Pty Ltd to be free from defects in materials and workmanship from the date of original purchase, for the period applicable to the specific product category (refer to the Warranty Period table below). This warranty covers replacement of product only.
Warranty Summary
Warranty Periods by Product Category
Source: Davcor Warranty Against Defects — Appendix A. Warranty period runs from the date of original purchase.
How to Make a Claim
- Contact Terry’s Tradies Pty Ltd and its associated websites, trading names, and subsidiaries (the place of purchase) in writing as soon as the defect becomes apparent — and no later than 14 days after the end of the applicable warranty period.
- Include in your written claim: a description of the defect, the date of supply, your contact details, and satisfactory proof of purchase.
- Do not return the product until a return authorisation number has been issued by Davcor. If return is required, the product must be in its original, complete, and saleable packaging.
- Davcor will test and assess the product. No claim is valid unless Davcor has confirmed a defect is present.
- Once a valid claim is confirmed, Davcor will — at its discretion — repair the defect, replace the product, or supply an equivalent product. If repair or replacement cannot be completed within a reasonable time, you may request a full refund, provided the product has been returned.
Delivery inspection: If you believe a product is defective or incorrectly supplied at the time of delivery, telephone notice must be given within 72 hours of receipt, with written notice (including full particulars) within 14 days of the invoice date.
Exclusions
Australian Consumer Law
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure, and to compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if they fail to be of acceptable quality and the failure does not amount to a major failure. The Lenlok/Davcor express warranty operates alongside and in addition to your rights under the Australian Consumer Law.
Further Information
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