Hex Head Lag Screw
Hex Head Lag Screws are essential fasteners designed specifically for securing pole line hardware to telephone poles and wooden structures. They feature a distinctive hex head design that allows for efficient installation using standard wrenches, making them ideal for utility and telecommunications applications.
These robust fasteners come in various diameters ranging from 1/4 inch to 5/8 inch with different length options. Hex Lag Screws are constructed from high-quality Grade 2 steel and undergo hot-dip galvanization according to ASTM A-153 standards. They incorporate gimlet thread points and regular threading patterns that ensure optimal grip and holding strength.
Hex Head Lag Screws can be paired with neoprene-backed steel washers for specialized applications like securing plastic U-cable guards. When used with these washers, they provide a protective cushion between the plastic components and the fastener head. The screws maintain a consistent thread length proportional to their overall size, typically featuring a 9/16-inch diameter washer when equipped.
Features:
• Hot-dip galvanized steel construction with Rockwell Hardness B70-B100 for superior corrosion resistance
• Gimlet thread point design enables precise installation and maximum holding power
• Available in multiple diameter sizes from 1/4″ to 5/8″ for versatile applications
• Compatible with neoprene-backed steel washers for specialized cable guard installations
• Minimum tensile strength of 2,350 pounds force for reliable structural support
Hex Head Lag Screw Drawing
| 螺纹尺寸 d | 6 | 8 | 10 | 12 | 16 | 20 | |
| P | 螺距 | 2.5 | 3 | 3.5 | 4 | 5 | 6 |
| ds | 最小值 | 5.7 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 |
| 最大值 | 6 | 8 | 10 | 12 | 16 | 20 | |
| C | 最大值 | 0.5 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 |
| e | 最小值 | 10.89 | 14.2 | 17.59 | 19.85 | 26.17 | 32.95 |
| k | 公称 | 4 | 5.3 | 6.4 | 7.5 | 10 | 12.5 |
| 最大值 | 4.38 | 5.68 | 6.85 | 7.95 | 10.75 | 13.4 | |
| 最小值 | 3.62 | 4.92 | 5.95 | 7.05 | 9.25 | 11.6 | |
| S | 最大值 | 10 | 13 | 16 | 18 | 24 | 30 |
| 最小值 | 9.64 | 12.57 | 15.57 | 17.57 | 23.16 | 29.16 | |
| da | 最大值 | 7.2 | 10.2 | 12.2 | 14.7 | 18.7 | 24.4 |
| dw | 最小值 | 8.7 | 11.4 | 14.4 | 16.4 | 22 | 27.7 |
| r | 最小值 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.8 |
| 千件钢制重≈kg | – | – | – | – | – | – | |
| 螺纹长度b | – | – | – | – | – | – | |
Frequently Asked Questions (FAQ)
What is a Hex Head Lag Screw?
A hex head lag screw is a heavy-duty wood fastener with thick shafts and coarse threads, designed for securing heavy lumber or materials bearing strenuous loads. It features a six-sided head and can be used with lag shields in masonry applications like concrete, brick, and mortar.
What sizes are available?
Lag screws typically range from #10 to 7/8″ in diameter. The length is measured from under the head to the tip. Two critical dimensions when ordering are the diameter and length. Thread length is typically half the nominal screw length plus 1/2″ or 6″, whichever is less.
What finishes are available?
Hex head lag screws come in zinc plating for moderate corrosion resistance, hot-dipped galvanized for higher corrosion resistance, and stainless steel for maximum corrosion resistance. Plain finish (uncoated with oil coating) is also available.
How do you properly install lag screws?
Pre-drill pilot holes slightly smaller than the root thread diameter for the full length of the screw. Use lubricant like vegetable oil or beeswax on threads. Install using an impact socket on an impact gun or wrench. Avoid water-based lubricants to prevent corrosion.
What head styles are available?
Hex heads are standard, but square heads are available for aesthetic or rustic looks. Both styles have the same strength and mechanical properties. Square heads were standard in construction-grade fasteners until the mid-1900s.
What grade and material are they made from?
Most lag screws are manufactured to ASTM A307 Grade A specification, made from low-strength, mild carbon steel. High-strength versions are available for specific applications. Check plans and specifications for correct grade requirements.
