[Product Overview]

The SLN Side Lock End Mill Holder (commonly known as a Weldon holder) is the ultimate solution for heavy-duty CNC milling. While collet chucks are excellent for finishing and holding small tools, aggressive roughing operations generate immense helical forces that can literally pull an end mill out of a standard collet, instantly destroying the workpiece and the tool. The side lock holder completely eliminates this risk. It uses one or two high-strength set screws that drive directly into the flat machined on the side of the cutting tool's shank (the Weldon flat), mechanically locking the tool in place and providing a positive, non-slip drive.

[Key Features & Advantages]

• Absolute Anti-Pullout Security: The mechanical locking action of the set screw against the Weldon flat guarantees that the end mill cannot spin or be pulled out of the holder, no matter how aggressive the depth of cut or feed rate.

• High-Precision Bore: The internal bore is precision honed to extremely tight tolerances (typically H4 or H5), ensuring a snug fit with the tool shank to maintain excellent concentricity and reduce runout.

• Premium Material & Hardness: Constructed from high-grade 20CrMnTi alloy steel and case-hardened to HRC 56-60. This provides a tough core to absorb heavy cutting vibrations and a highly wear-resistant surface.

• Dynamic Balancing (Optional/Standard): For high-speed machining, our tool holders can be dynamically balanced to G6.3 at 15,000 RPM or G2.5 at 25,000 RPM, protecting your machine's spindle bearings and ensuring smooth cuts.

• Coolant-Through Capability: Many of our SLN holders are available with internal coolant channels (AD or AD/B form), delivering high-pressure coolant directly to the cutting edge for improved chip evacuation and extended tool life.

[Why Partner with Pingyuan Zhenghao Machinery?]

• Direct Manufacturer Savings: Bypass trading companies and source heavy-duty CNC milling chucks directly from our factory for highly competitive wholesale pricing.

• Comprehensive Size Range: We manufacture SLN holders for all standard metric (e.g., SLN6 to SLN40) and imperial (e.g., 1/4" to 1-1/2") bore sizes, in various gauge lengths (stub, standard, and extended).

• Strict Quality Control: Every tool holder undergoes rigorous inspection using advanced air gauges to verify bore diameter and taper accuracy before it leaves our facility.

• OEM & Customization: We offer laser engraving of your brand logo, part numbers, and custom balancing specifications directly onto the tool holders for retail distribution.

Frequently Asked Questions (FAQ) - Selection Guide

Q1: When should I use a Side Lock (SLN) holder instead of an ER Collet Chuck?

A: You should use an SLN Side Lock holder for heavy roughing, high material removal rate (MRR) milling, and machining tough materials (like titanium or hardened steel) where the cutting forces are extreme. ER collets rely on friction and are better suited for finishing, drilling, or light milling where high concentricity is the priority over sheer holding power.

Q2: What is a "Weldon Flat"?

A: A Weldon flat is a precision-machined flat surface on the cylindrical shank of an end mill or drill. The set screw of the side lock holder seats directly against this flat to prevent the tool from rotating or pulling out.

Q3: Can I use a tool with a perfectly round shank in a Side Lock holder?

A:No. If you tighten the set screw against a round shank, it will crush and deform the shank, runout will be terrible, and the tool will eventually slip. You must either use tools manufactured with a Weldon flat or carefully grind a flat onto the shank yourself before using it in an SLN holder.

Q4: How tight should I make the set screw?

A: The set screw should be tightened firmly using a high-quality hex key. However, over-tightening can distort the tool holder bore or strip the threads. Always ensure the set screw is perfectly aligned with the flat on the tool shank before tightening.

Eliminate tool pullout and maximize your milling efficiency with our rigid SLN Side Lock Holders.

Contact our sales team today for a complete catalog and bulk pricing.