CNC Thread Rolling Machine - High Precision, High Efficiency
Inside Modern Thread Shops: the CNC Workhorse That Doesn’t Flinch
If you’ve walked a fastener plant lately, you’ve seen it: a Cnc Thread Rolling Machine quietly pressing perfect threads at a pace cutting can’t touch. The unit I’ve been watching is sold as the “anchor bolt stainless rod thread making machine thread rolling machine,” built in XingWan Industrial Zone, Xingtai City, Hebei, China. It’s a type 250 platform—sturdy, no drama, surprisingly compact.
Why rolling, now?
Two reasons: strength and takt time. Rolled threads cold-form material, improving grain flow and fatigue life—especially on anchor bolts, stainless rods, and high-duty studs. And the cycle time? In many shops, it’s the difference between meeting an impossible deadline and sending apologies. To be honest, the energy footprint is lower than many expect, too.
Key specifications (Type 250)
| Max thread diameter | 60 mm |
| Thread length | Not limited (stock-length dependent) |
| Main drive power | ≈15 kW |
| Hydraulic power | ≈3.75 kW |
| Cooling power | 125 W |
| Overall size (L×W×H) | 1950 × 1750 × 1600 mm |
| Typical threads | Metric M8–M60, UN/UNF (real-world use may vary) |
Process flow (how shops actually run it)
- Materials: carbon steel (C45), alloy steel (42CrMo), stainless 304/316, rebar grades.
- Prep: cut-to-length, chamfer ends, light oiling.
- Setup: die selection (DIN 13 / ASME B1.13M), center height, infeed pressure.
- Rolling: cold forming with matched flat/round dies; pitch controlled by die lead.
- QC: GO/NO-GO gauges per ISO 965-1; hardness checks (ISO 6508-1); salt-spray for plated parts as needed.
- Service life: dies ≈ 50,000–200,000 cycles (depends on material/lube).
- Packaging: rust inhibitor, caps, bundle tags with heat/lot traceability.
Where it’s used
- Wind and solar farm anchor bolts; - Bridge and tunnel supports; - Automotive tie-rods and ball-studs; - General construction fasteners. One EPC contractor told me their cycle time dropped to 9–12 s per M24 anchor, which frankly surprised their planners.
Real-world test snapshot
42CrMo blank, M36×4, 32 HRC, emulsion at 6%: Ra ≈ 1.6 μm, pitch error within 6H, pull-out improved ≈15% over cut threads (shop test; your mileage may vary). Noise was lower than expected, to be honest.
Why a Cnc Thread Rolling Machine beats cutting (most days)
- Stronger threads (work-hardened roots, continuous grain flow).
- Faster throughput and less chip management.
- Better surface finish, fewer galling complaints on stainless.
- Energy efficient per part—especially on long runs.
Vendor snapshot (what buyers compare)
| Vendor | Capacity | Pitch range | Controls | After-sales |
|---|---|---|---|---|
| Motetools (Type 250) | Ø up to 60 mm | ≈ 0.5–6 mm | CNC/PLC, hydraulic assist | Remote + on-site (CN/EU partners) |
| Brand A | Ø up to 50 mm | ≈ 0.7–4 mm | PLC | Regional service |
| Brand B | Ø up to 80 mm | ≈ 1–8 mm | CNC | Global network |
Customization & compliance
Options include left/right-hand threads, special pitches, knurling dies, auto feeders, and mist or flood coolant. Compliance: ISO 9001 shop systems, threads to ISO 965-1 / ASME B1.13M, material per ISO 683 or ASTM A193 for anchors. Gauging with GO/NO-GO per class 6g/6H; hardness via ISO 6508-1. CE marking is available on request, I’m told.
Quick case notes
- Solar EPC (Spain): 18,000 pcs M27 anchor bolts, 14 s cycle avg, 0.7% rework; “setup repeatability was better than expected.”
- Bridge retrofit (ME): 4140 M36 bars, switch from cut to Cnc Thread Rolling Machine lifted fatigue life in lab coupons by ≈12%.
References: [1] ISO 965-1:2013, [2] ASME B1.13M-2005, [3] ISO 6508-1:2016, [4] Machinery’s Handbook (Thread Rolling overview), [5] ISO 683 (alloy steels).