Spi 14-034-3 Screw Pitch Gage 51 Leaf 4-84 Tpi

Product Description

The SPI 14-034-3 is a 51-leaf screw pitch gage used to identify and verify thread pitch on fasteners and threaded components. Each leaf is stamped with its corresponding threads-per-inch (TPI) value, allowing technicians to quickly fan through the set and match pitch by feel and visual alignment. The gage covers a 4 to 84 TPI range with a 60-degree thread angle and is constructed from steel for durability in shop and field environments. Plumbers, pipefitters, HVAC technicians, and maintenance professionals use screw pitch gages during equipment service, fabrication, and parts identification work.

This gage is suited for identifying both external and internal thread pitch across a wide range of fasteners, pipe fittings, and machine screws encountered in mechanical and trade applications. The broad 4 to 84 TPI range covers coarse and fine thread series common in plumbing, HVAC, electrical, and general mechanical work. It is a practical addition to any service van, maintenance shop, or tool kit where fastener identification is a routine task.

Key Features

• 51 individual leaves covering 4 to 84 TPI range
• 60-degree thread angle suits unified and standard thread forms
• Works on both external and internal threaded components
• Steel construction for shop durability
• Leaves are stamped with TPI values for fast identification

Compatibility

Designed for use with external and internal threaded fasteners and fittings across the 4 to 84 TPI range. Suitable for unified thread series and other 60-degree thread forms encountered in trade and mechanical applications.

Installation Notes

No installation is required for this hand tool. To use, fan through the leaves and align the gage teeth against the threaded component until a flush, gap-free match is achieved. Always match the gage to a clean, undamaged thread section for accurate identification. Store the gage closed when not in use to protect the leaves from bending or contamination.