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QD BUSHING SERIES | TAPER-LOCK SHAFT MOUNTING | UK INDUSTRIAL SUPPLY
JA QD Type Bushings
Bore: 7/16″ – 1-1/4″ · OD 2.000″ · Weight 0.90 lb · Set Screw 10-24 · 60 in./lbs. Torque
Precision-Engineered QD Bushing for Compact Drive Assemblies
The JA QD bushing is the smallest member of the industry-standard Quick Detachable bushing family, engineered to deliver a secure, repeatable shaft connection for sheaves, sprockets, pulleys, and other hub-mounted drive components. The taper-lock design generates radial clamping force around the full bore circumference as cap screws are torqued to the 60 in./lbs. specification, eliminating the fretting wear and stress concentrations associated with conventional keyed-hub designs. Every JA QD bushing we supply is manufactured from solid medium-carbon steel with finish-ground bore and taper surfaces, then electroplated for corrosion protection in general industrial environments.
At QD-Bushings.top, our engineering team brings over 18 years of hands-on power transmission experience to every enquiry. We supply JA QD bushings to plant maintenance teams, OEM manufacturers, and procurement departments across England, Scotland, Wales, and Northern Ireland — with standard bore items available from UK stock and custom-machined bores delivered in as few as 10 working days. Whether you need a single replacement bushing or a blanket OEM contract, we offer competitive pricing and responsive technical support from first contact to delivery.
JA QD BUSHING — DIMENSIONAL REFERENCE DRAWING
JA QD Bushing — Full Dimensional Data
STANDARD DIMENSIONS IN INCHES | METRIC BORE SIZES ALSO STOCKED
| Parameter | Value | Notes |
|---|---|---|
| Bushing Type | JA | Smallest standard QD size |
| Available Bore Sizes | 7/16″, 9/16″, 15/16″, 1-3/16″, 1-1/16″, 1-1/4″, 24mm, 30mm, 38mm | Custom bores available |
| Dim. A (Face Width) | 0.375″ | Flange face width |
| Dim. B (Length) | 1.375″ | Total bushing length |
| Dim. D (OD) | 2.000″ | Outer diameter of taper body |
| Dim. E | 0.688″ | Flange projection |
| Dim. F | 0.563″ | Key stock width |
| Dim. G (Key Depth) | 0.125″ | Keyway depth in bore |
| Dim. L (Taper Length) | 1.000″ | Engaged taper length |
| Bolt Circle | 1.665″ | Pull-up bolt hole PCD |
| Set Screw Size | 10-24 | Standard Allen socket cap |
| Installation Torque | 60 in./lbs. (6.78 Nm) | Per bolt torque table |
| Weight | 0.90 LBS (0.41 kg) | Per unit, standard bore |
QD Bushing Bolt Torque Table — All Sizes
CRITICAL: TIGHTEN BOLTS ALTERNATELY AND EVENLY. DO NOT EXTEND WRENCH HANDLES.
| QD Bushing Size | Cap Screw Size | Torque (in./lbs.) | Metric (Nm) |
|---|---|---|---|
| JA ▲ This Product | 10 – 24 | 60 | ≈ 6.78 |
| SH, SDS, SD | .25 – 20 | 108 | ≈ 12.2 |
| SK | .3125 – 18 | 180 | ≈ 20.3 |
| SF | .375 – 16 | 360 | ≈ 40.7 |
| E | .5 – 13 | 720 | ≈ 81.3 |
| F | .5625 – 12 | 900 | ≈ 101.7 |
| J | .625 – 11 | 1620 | ≈ 183.1 |
| M | .75 – 10 | 2700 | ≈ 305.1 |
| N | .875 – 9 | 3600 | ≈ 406.7 |
| P | 1 – 8 | 5400 | ≈ 610.2 |
| W | 1.125 – 7 | 7200 | ≈ 813.5 |
| S | 1.125 – 7 | 9000 | ≈ 1017 |
ⓘ JA row highlighted. Metric Nm conversions are approximate. Verify with a calibrated torque wrench on-site.
Why Maintenance Engineers Across the UK Choose JA QD Bushings
ENGINEERING ADVANTAGES THAT REDUCE COST AND DOWNTIME
No Special Tooling Required
A standard Allen key is all that is needed for both installation and removal of the JA QD bushing. The pushoff hole system reverses the cap screws against the hub face to break the taper seal cleanly — no puller, press, or heat gun. This is particularly valuable for British plant operators working in confined equipment spaces or during unplanned breakdown events where specialist tooling may not be to hand.
Vibration Dampening & Fretting Prevention
The QD taper’s full circumferential contact eliminates the micro-movement at bore-shaft interfaces that causes fretting corrosion and keyway enlargement in conventional pin-hub or split-taper designs. For UK inertial guidance systems, radar equipment, engine accessories, and high-cycle packaging machinery, the JA bushing’s clamping grip actively isolates vibration and protects both shaft and hub from fatigue damage that would otherwise shorten service intervals.
Fully Reusable Across Multiple Removal Cycles
Unlike interference-fit bushings that deform plastically on first removal, the JA QD bushing retains its dimensional integrity and clamping performance through repeated installation and disassembly cycles, provided the taper surfaces are kept clean and dry at each fitting. UK maintenance teams running refurbishment programmes on drive assemblies can reuse JA bushings without replacement, reducing ongoing parts spend significantly on high-turnover equipment like conveyor drives and pump sets.
Gap-Confirmation Design — Correct Fit is Visible
When properly installed to the specified torque, the JA QD bushing leaves a visible gap between the sprocket or sheave hub face and the bushing flange — confirming that the taper has fully engaged and the press-fit grip is active. This physical verification step eliminates the guesswork of hidden-interference fits and means any UK site engineer or apprentice can verify a correct installation on first inspection, without torque auditing equipment.
Installation, Materials & Industrial Applications
STEP-BY-STEP GUIDANCE FROM EXPERIENCED POWER TRANSMISSION ENGINEERS
Installation Steps
Standard QD Mounting Procedure
Ensure both the bushing taper and the hub bore are clean, dry, and free of oil or anti-seize lubricant before assembly — any contamination will prevent full taper engagement and reduce clamping force. Slide the JA bushing onto the shaft flange-end first and assemble the key, tightening the set screw hand-tight only. Position the sprocket or sheave so the drilled bolt holes align with the taper holes in the bushing flange, then thread in the pull-up bolts with lock washers.
Tighten pull-up bolts alternately and evenly, working up to the 60 in./lbs. specification in gradual stages without extending the wrench handle. A visible gap must remain between hub face and bushing flange at completion — closing this gap entirely indicates over-tightening or an incompatible bore condition. Re-torque after the initial run-in period under load.
Removal Procedure
Fast & Tool-Free Dismounting
To remove the JA QD bushing, back out the pull-up bolts completely and relocate them into the pushoff holes in the bushing flange — these threaded holes are specifically positioned to bear against the hub face when screws are tightened. As the cap screws are threaded in, they push the bushing axially out of the hub taper, breaking the interference cleanly without shock loading or hammering.
This pushoff system is the critical differentiator between QD bushings and standard taper-lock types, which require a drift punch or hydraulic puller for removal. For UK food processing, pharmaceutical, and packaging lines where drives must be stripped regularly for hygiene inspection, the QD pushoff mechanism reduces disassembly time from minutes to seconds and eliminates the risk of shaft or hub damage during the process.
Application Sectors
Where JA QD Bushings Work Hardest
The JA QD bushing is the standard mounting choice for V-belt sheaves on small-frame electric motors up to approximately 7.5 kW, roller chain sprockets on packaging and bottling conveyors, timing pulleys in indexing and registration drives, and centrifugal blower hubs in HVAC installations across UK commercial and industrial buildings. The compact 2″ OD makes it appropriate wherever hub envelope size is constrained.
Key UK industry sectors served include food and beverage production in the North West and Midlands, aggregate quarrying in Wales and Scotland, pharmaceutical and life sciences manufacturing in the South East, textile machinery refurbishment in Yorkshire, and offshore and marine auxiliary equipment for North Sea operations where the stainless steel variant with full material traceability is routinely specified.
Manufacturing & Custom Orders
15+ Years of OEM & Custom Bushing Production
Our manufacturing facility has produced QD bushings and related drive components for OEM and aftermarket customers across the globe for over fifteen years, accumulating the process knowledge and quality infrastructure that volume industrial buyers demand. CNC boring centres dedicated to bushing production allow us to machine any JA blank to a bespoke shaft diameter with H7 tolerance, including metric, non-standard inch, and polygon shaft configurations, without the extended lead times that characterise OEM supply chains. First-article inspection reports and EN 10204 3.1 material certification are available for all custom orders.
OEM and ODM service is a core part of our offering — if you are sourcing for a machine builder, a refurbishment programme, or a blanket-purchase agreement that requires consistent dimensional and material quality across multiple deliveries, we can support that. We have matched and beaten competitor pricing for procurement teams across the UK who needed better commercial terms without compromising on consistency or traceability. Send us your specification or current supplier’s part number and we will personalise a quote within one business day.
What Our B2B Clients Say
VERIFIED ACCOUNTS FROM UK INDUSTRIAL BUYERS
★★★★★
“We needed replacement JA bushings for chain sprockets on our bottling line conveyor at our Manchester facility. QD-Bushings.top matched our existing bore spec exactly, dispatched from UK stock within 48 hours, and the installation was textbook — gap confirmed, zero vibration issues since commissioning. Pricing was noticeably sharper than our previous MRO supplier.”
ALAN W. — Engineering Manager
Food & Beverage Production | Greater Manchester, England
★★★★★
“As a Yorkshire-based textile machinery rebuilder, finding JA bushings to non-standard metric bore sizes was always a headache through mainstream distributors. QD-Bushings.top’s custom bore service sorted it in ten days at a fair price. We now have a standing arrangement for all our QD bushing requirements and the quality has been consistent across every batch.”
SARAH K. — Operations Director
Textile Machinery Rebuilding | West Yorkshire, England
★★★★★
“We procure drive components for pharmaceutical production sites across the South East and traceability is paramount. QD-Bushings.top provided 3.1 certs with every delivery, their technical team confirmed compatibility with our existing V-belt sheave hubs on the first call, and the pricing structure for our quarterly call-off orders is genuinely competitive. Highly recommended as a specialist UK supplier.”
NEIL F. — Procurement Lead
Pharmaceutical Manufacturing | Surrey, England
Frequently Asked Questions
ANSWERED BY OUR POWER TRANSMISSION ENGINEERING TEAM
How do I correctly install a JA QD bushing on a V-belt sheave for a conveyor motor at a UK food processing plant?
Clean both the bushing taper and hub bore thoroughly — any oil or grease will prevent full taper engagement. Slide the JA bushing on the shaft flange-first, assemble the key hand-tight, then align the sheave hub with the bushing bolt holes. Thread in the pull-up bolts with lock washers and tighten alternately and evenly to 60 in./lbs. A visible gap between the hub face and bushing flange is the sign of a correctly made installation. Re-torque after the first loaded run cycle.
What is the price of JA QD bushings in the UK, and do you offer volume discounts for OEM orders with non-standard bore sizes?
Pricing depends on bore specification and order quantity. Standard bore JA bushings are available at competitive MRO rates, and we offer tiered volume discounts beginning at 50 units for OEM buyers. Custom-bored versions are priced according to specification. Email [email protected] with your part details for a same-day itemised quote — we are happy to match or improve on your current supplier’s pricing.
Which bore sizes are available for the JA QD bushing, and can I get a 30mm metric bore for a pump drive in Scotland?
Yes — we stock JA QD bushings with a 30mm metric bore. Standard available bores include 7/16″, 9/16″, 15/16″, 1-3/16″, 1-1/16″, 1-1/4″, 24mm, 30mm, and 38mm. If your pump shaft requires a different size, our CNC boring service can machine any standard JA blank to a custom diameter with H7 tolerance. We deliver to all Scottish postcodes from UK stock.
Where can I find a reliable QD bushing supplier in England who can provide OEM and ODM service with material certification for pharmaceutical projects?
QD-Bushings.top supports OEM and ODM procurement with full EN 10204 3.1 material certification on request. We supply pharmaceutical manufacturing sites across the South East, Midlands, and beyond, with documentation packages aligned to GMP supplier qualification requirements. Contact [email protected] to discuss your project requirements and documentation needs.
How does a QD bushing compare to a split taper bushing for a chain sprocket application in a Welsh aggregate plant, and which gives better value?
Both achieve shaft grip through taper interference, but the QD design includes dedicated pushoff holes for clean, tool-free removal — critical in dusty aggregate environments where corrosion can seize split-taper designs after extended service. The JA QD bushing’s heavier wall section and full-circumference contact also deliver superior vibration resistance in the high-shock loading typical of aggregate screening and crushing drives. For plants across Wales and the wider UK, the lower lifetime maintenance cost makes the QD the better long-term value, even at a slightly higher unit price.
Explore the Full QD Bushing Range
SAME TAPER-LOCK SYSTEM — SCALED FOR HIGHER TORQUE REQUIREMENTS
SH / SDS / SD
108 in./lbs.
SK
180 in./lbs.
SF
360 in./lbs.
E / F / J
720 – 1620 in./lbs.
M / N
2700 – 3600 in./lbs.
P / W / S
5400 – 9000 in./lbs.
UK INDUSTRIAL DRIVE COMPONENTS | OEM & MRO SUPPLY
Get Your JA QD Bushing Quote Today
Standard stock, custom bores, full traceability, competitive pricing, UK delivery — our team is ready to support your procurement from first enquiry to confirmed order. Expect a detailed quote within one working day.
edit by gzl
