30-50% Price Premium

Distributors mark up left hand thread socket head cap screws excessively. You’re paying middleman margins for a standard product.

8-16 Week Lead Times

Specialty thread suppliers keep low inventory. When you need left hand fasteners fast, you wait — and your production line stops.

Inconsistent Quality

Mixed batches, wrong thread pitch, poor surface finish — rework and rejects eat your margins and delay projects.

Bolt-On Shipping Costs

Small-volume air freight from multiple suppliers inflates your landed cost. No consolidated shipping = no savings.

Powerful Factory, Direct Pricing

12,000㎡ facility with 200+ CNC machines. Factory-direct means 30-50% cost savings for you — no middlemen, no markups.

Quality Assurance You Can Trust

Every batch of left hand thread socket head cap screws is tested for hardness, tensile strength, and thread accuracy. ISO 9001, CE, RoHS certified.

High-Speed Global Delivery

10-15 days for standard orders. Express service: 7 days to USA/EU ports. Consolidated shipping to reduce your freight costs.

OEM/ODM Customization

Need a special thread length, head marking, or surface treatment? We engineer to your print. Low MOQ available for prototyping.

Full Traceability & ERP Integration

Heat number, material cert, dimensional report — all digital. Integrate with your procurement system for seamless ordering.

One-Stop Service

From material selection (carbon steel, alloy steel, stainless steel, brass) to logistics tracking — your dedicated account manager handles everything.

James Mitchell
Procurement Manager, Mitchell AgriParts (USA)

“We switched to Boen for our left hand socket head cap screws and cut our fastener spend by 34%. Quality is consistent — every batch passes our inspection. The 10-day delivery keeps our line running.”

Elena Rossi
Technical Director, Rossi S.p.A. (Italy)

“The traceability and certs Boen provides for left hand thread socket head cap screws are outstanding. Full material certs, dimensional reports — it makes our compliance audit effortless.”

A left hand socket head cap screw has reverse threads (tightens counterclockwise). It is used in applications where rotational forces would otherwise loosen a standard right-hand fastener — such as on rotating shafts, pulleys, fans, and certain automotive and agricultural equipment.

We offer metric sizes M3–M24 and imperial sizes #4–3/4″ in grades 12.9, 10.9, A2-70, A4-80, 304, 316, brass, and aluminum. Custom lengths and head styles are available for OEM orders.

For standard sizes, our MOQ is 500 pieces per size. For custom OEM/ODM projects, we can accommodate as low as 200 pieces for prototyping. Contact us for volume pricing.

Each order includes: Material Test Certificate (MTC), dimensional inspection report, hardness test report, and declaration of compliance (ISO 9001, CE, RoHS). Third-party testing (SGS, TÜV) is available upon request.

Standard delivery: 10-15 working days via air freight. Express service: 7 working days. Sea freight (FCL/LCL) takes 20-30 days depending on the port. We provide real-time tracking for all orders.

Absolutely. Our engineering team can review your drawing, sample, or application details and recommend the correct thread size, pitch, material, and surface treatment. We provide free technical consultation for volume buyers.

We accept T/T (bank transfer), L/C (letter of credit), PayPal, and Western Union. For first-time customers, a 30% deposit is standard, with 70% balance against the shipping document. We also offer open terms for qualified long-term partners.

We follow a 3-stage quality control process: (1) Incoming raw material inspection, (2) In-process dimensional and hardness checks, (3) Final inspection before packing — including thread gauge testing, visual inspection, and salt spray testing for coated parts. A full QC report is included with every shipment.

David Chen

Supply Chain Manager, Midwest Machinery (USA)

“Boen’s left hand thread socket head cap screws saved us 37% compared to our previous distributor. Delivery was 11 days, and the quality report was spot-on. We’ve placed 4 repeat orders this year.”

Sophie Müller

Technical Buyer, Müller Automation (Germany)

“The traceability and documentation Boen provides for left hand socket head cap screws is excellent. Every batch comes with full certs, and the thread accuracy is within 0.02mm. Highly reliable.”

Ahmed Al-Rashid

Operations Director, Gulf Energy (UAE)

“We needed a custom left hand thread socket head cap screw for a wind turbine project. Boen delivered prototypes in 8 days, and the full order was ready in 15. Exceptional service and product quality.”