--Fixtures Jigs Quick Locking Bolts--
Say goodbye to cumbersome thread adjustment. The D28 quick-lock bolt, specially designed for tooling fixtures, enables "lock with one twist", reducing changeover time by 80%.
◆How can a 30-second tightening action be compressed into just 1 second?
If your production line requires 50 fixture changes per day, traditional threaded bolts waste 230 hours of unproductive working hours for you each year.
The D28 quick-lock bolt – engineered specifically for high-frequency changeover scenarios. No need to fully thread it in; insert and lock instantly. Listen for that crisp "click" – the changeover is complete.
Products Parameters
| Parameter | Specification |
|---|---|
| Product Model | D28-QLB (Quick Locking Bolt) |
| Nominal Diameter (D) | 28mm |
| Applicable Length (L) | 50mm / 75mm (Non-standard customization supported) |
| Locking Type | 1/4 turn quick lock (90°) or Push-pull automatic lock |
| Max. Static Load | ≥ 35 kN (approx. 3.5 tons) |
| Repeat Positioning Accuracy | ± 0.01 mm |
| Operating Temperature | -40°C to 150°C |
| Safety Mechanism | Anti-mistake release button (requires special tool or specific angle to unlock) |
Products features
★. Patented "ball lock"/plunger structure
Built-in high-precision spring steel balls. When the bolt is inserted into the D28 bore to the preset depth, the steel balls automatically pop out and lock into the annular groove, forming a physical lock. No tools are required, and blind operation is equally precise.
★. Zero-clearance fit to eliminate vibration
Traditional bolts tend to loosen easily under vibration, leading to fixture displacement and workpiece scrappage. The D28 quick-lock bolt adopts a conical surface or expansion design (depending on the actual mechanical structure), with radial runout < 0.02 mm after locking, remaining completely stable even during high-speed CNC milling.
★. Ultra-fast changeover (SMED)
Designed specifically for Lean Production. Converts internal mold change time into external preparation time. Operators can complete the unlocking and relocking of tooling in one second without even stopping the machine.
★. Durable and corrosion-resistant
Material: 42CrMo alloy steel (or 304/316 stainless steel as applicable)
Heat treatment: Carburizing and quenching, surface hardness HRC 58-62
different size and colours of ball clamping bolts.
D28*50 Short bolts(Black)
D28*50 Short bolts(Original White)
D28*75 Long bolts(Black)
D28*75 Long bolts(Original White)
D16*24 Short bolts(Black)
D16*36 Long bolts(White)
Products Application
• Welding fixture: Quickly replace fixture plates for different vehicle models, resist welding spatter and thermal deformation.
• CNC machining center: Achieve rapid pallet exchange and improve spindle operating efficiency.
• Automated production line: Serve as the base locking unit for the quick-change device at the robot end.
• Inspection fixture: Rapidly switch inspection modules for multi-variety and small-batch parts.
Package and delivery
Each D28 Quick Locking Bolt is individually wrapped in anti-rust paper and sealed in a plastic bag, then packed in a foam-lined cardboard box to prevent damage during transit. Standard orders are processed within 3-5 business days, while sample orders (1-10 pieces) ship in 1-3 days. We ship worldwide via DHL, FedEx, or UPS (3-7 days), as well as air freight and sea freight for bulk orders. All shipments include a packing list and commercial invoice for customs clearance. Please inspect your package upon arrival and report any damage or shortage within 48 hours with photos. Import duties and taxes are the buyer's responsibility. For bulk orders of 500 pieces or more, contact us for discounted shipping rates.
Important Notes
♦All shipments include a packing list inside the carton.
♦A commercial invoice is attached to the outside for customs clearance.
♦For international orders, import duties and taxes are the buyer's responsibility unless otherwise arranged.
♦Insurance is optional but recommended for large orders. Please confirm at checkout.
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Q1: Can the D28 bolt be used on a standard welding table?
A: Yes, as long as your welding table has 28mm diameter holes with a locking groove. It works perfectly with most modular welding tables (e.g., Siegmund, Demmeler, or similar systems).
Q2: How is this different from a normal bolt?
A: No threading or tools required. Just insert and lock in 1 second with a 1/4 turn or push. Saves 80% of changeover time.
Q3: How do I clean the bolt if it gets dirty from welding?
A: Simply wipe off spatter with a wire brush or rag. The internal locking parts are sealed, so dust and debris won't affect performance. For best results, apply anti-spatter spray before welding.
Q4: How long does it last?
A: Tested for over 100,000 locking cycles under normal use.
Q5: Is it compatible with my existing welding table clamps and stops?
A: Yes. The D28 bolt uses the same 28mm hole standard as most professional welding tables. You can mix and match with your existing accessories without modification.
Q6: How fast can I reconfigure my welding fixture with D28 bolts?
A: A full fixture change takes less than 1 minute. Just unlock, reposition, and lock again. No wrenches, no screws. Perfect for job shops that weld many different parts daily.
Get an instant quote
📧 Email: evasummer@lemarmetal.com
📱 WhatsApp / WeChat: +8615995269947
💬 Facebook Messenger: Eva Lemarweldingtable
🌐 Official website: www.lemarmachine.com
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