What is a 4-point wheelchair tie-down system?

A 4-point tie-down uses four retractors or straps — two at the front and two at the rear of the wheelchair — to secure the chair to the vehicle floor. When combined with a lap and shoulder belt for the occupant, it meets federal ADA and WC18 securement standards for paratransit, NEMT, and school bus transport.

Is wheelchair securement required by law?

Yes. The Americans with Disabilities Act (ADA) requires that all public transit vehicles equipped to transport wheelchair users must have an approved securement system. NEMT providers, paratransit operators, and school bus fleets are all subject to federal and state securement regulations. Failure to comply can result in fines and significant liability in the event of an accident.

What does WC18 compliant mean?

WC18 is the RESNA/ANSI standard that defines performance requirements for wheelchair tie-down and occupant restraint systems (WTORS). WC18-compliant products have been crash-tested to withstand higher load forces than previous standards, providing greater protection for wheelchair users in the event of a collision or sudden stop.

Which wheelchair securement brands do you carry?

We are an authorized dealer for Q'Straint, AMF Bruns, and Sure-Lok — the three leading manufacturers of wheelchair tie-down and occupant restraint systems worldwide. All products meet or exceed WC18 compliance standards where applicable.

What is the difference between an L-track and a Slide N' Click system?

L-track is a recessed floor channel that accepts fittings at any point along its length, giving installers maximum flexibility in retractor placement. Slide N' Click is Q'Straint's proprietary system using pre-set anchor points that allow faster, tool-free securement — popular in high-volume paratransit operations where speed of securement matters.

What is the difference between a manual and retractable wheelchair strap?

Manual straps are fixed-length webbing straps with a hook or loop connection — simple, affordable, and reliable. Retractable systems use a spring-loaded mechanism to automatically take up slack, making securement faster and reducing trip hazards from loose webbing. Electric retractors add powered retraction, ideal for operators or drivers with limited hand strength or mobility.

Do you offer fleet pricing for multiple vehicles?

Yes. We offer fleet pricing for operators outfitting five or more vehicles. Submit your vehicle count, vehicle type, and preferred brand through our Fleet Quote form and a specialist will respond within one business day.

Do your products come with installation instructions?

Yes. All products ship with manufacturer installation guides. We also maintain a full library of installation and user guides on our website for Q'Straint, AMF Bruns, and Sure-Lok products. Our specialists are also available by phone at 800.884.6456 if you need installation support at no charge.

FREE STANDARD SHIPPING ON ORDERS OVER $100 - 800.884.6456

Q'Straint QLK 3/16" Base Mount (Shim) | QC04057

Vendor: Q'Straint
Regular price: $35.25
Sale price: $35.25
Unit price: per

Shipping calculated at checkout.

The QC04057 is a Q'Straint QLK 3/16" Base Mount Shim — a precision spacer used to make fine height adjustments to the QLK or QLK-150 docking base installation. Sold as a pack of 2 shims, each measuring approximately 8.5" x 1-3/16" x 3/16".

SKU: QC04057 | VENDOR: Q'STRAINT

Q'Straint QLK 3/16" Base Mount (Shim) | QC04057

🚚 Free Shipping on Orders Over $100 📏 3/16" Shim 🏷 Q'Straint

Key Features

📏

3/16" Fine Adjustment

Provides 3/16" of additional height adjustment to fine-tune the QLK base mount position for proper bracket alignment.

📦

2-Pack

Includes two (2) shims per order. Dimensions: approximately 8.5" x 1-3/16" x 3/16".

🔩

Steel Construction

Precision-machined steel shim for a stable, accurate fit under the QLK base mount.

🔗

QLK & QLK-150 Compatible

Works with all QLK and QLK-150 base mount configurations.

What's Included

Qty	Component	SKU
2	QLK 3/16" Base Mount Shim (~8.5" x 1-3/16" x 3/16")	QC04057

Full Feature Details

Key Feature Summary

Feature	Description
3/16" Fine Adjustment	Provides 3/16" of additional height adjustment to fine-tune the QLK base mount position for proper bracket alignment.
2-Pack	Includes two (2) shims per order. Dimensions: approximately 8.5" x 1-3/16" x 3/16".
Steel Construction	Precision-machined steel shim for a stable, accurate fit under the QLK base mount.
QLK & QLK-150 Compatible	Works with all QLK and QLK-150 base mount configurations.

Vehicle Applications

🚐 Wheelchair-Accessible Van (WAV) 🚗 Personal Vehicle / Minivan 🚑 Non-Emergency Medical Transport (NEMT) 🚐 Sprinter / Transit Van

Standards & Compliance

ANSI/RESNA WC18Wheelchair Tiedowns & Occupant Restraint Systems

SAE J2249Wheelchair Tie-Down Systems for Motor Vehicles

ISO 10542Wheelchairs — Tie-Down & Occupant Restraint Systems

📘 Compliance & Documentation: For state-by-state Medicaid/NEMT requirements, ADA guidance, and fleet documentation tools, visit our Compliance Resource Center. This product meets ANSI/RESNA WC18. For contract documentation and compliance verification, see the Compliance Resource Center.

🛡 Warranty: 3-year limited. * Registration required at qstraint.com for full coverage. Without registration, 1-year limited applies.

⚠ Warranty terms should be verified directly with the manufacturer.

⚠ California Prop 65 Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. See qstraint.com/prop-65

📄 QLK Resources: QLK Bracket Instruction List | All User Guides

Specifications

Specification	Detail
Brand	Q'Straint
SKU	QC04057
Price	35.25 — per pack (2 shims)
Shipping	Free Shipping on Orders Over $100
Warranty	3-year limited
Shim Height	3/16"
Dimensions	~8.5" x 1-3/16" x 3/16"
Qty per Order	2 shims
Compatible With	QLK / QLK-150

Frequently Asked Questions

What wheelchair docking system does this work with? +

This product is designed for Q'Straint QLK and/or QLK-150 Docking Systems. See the Specifications section above for specific compatibility. Not all Q'Straint QLK products are cross-compatible — contact us to confirm before ordering.

Is professional installation required? +

Yes. Q'Straint QLK docking systems and components must be installed by a certified WAV (Wheelchair Accessible Vehicle) modifier. Improper installation may void the warranty and compromise safety certifications.

What is the warranty on this product? +

Q'Straint offers a 3-year limited warranty when the product is registered at qstraint.com. Without registration, a 1-year limited warranty applies. Warranty terms should be verified directly with the manufacturer.

How do I find the right bracket for my wheelchair? +

Browse our full QLK Bracket List or contact us — we verify bracket compatibility before every order. Phone: (972) 420-0800 | Email: sales@wheelchairstrap.com

Q'Straint QLK 3/16" Base Mount (Shim) | QC04057

Key Features

3/16" Fine Adjustment

2-Pack

Steel Construction

QLK & QLK-150 Compatible

What's Included

Full Feature Details

Vehicle Applications

Standards & Compliance

Specifications

Frequently Asked Questions

Related Products

Questions about compatibility or installation?