Bk 521-910HC Hex Black Iron Bushing 1/4x1/8

Product Description

The BK 521-910HC is a hexagon black iron pipe bushing designed to reduce a 1/4-inch male NPT thread down to a 1/8-inch female NPT thread. Constructed from black malleable iron meeting ANSI/ASTM A-197 material standards, this bushing provides a durable, pressure-rated connection point in iron pipe systems. Threads conform to ANSI B1.20.1 for reliable sealing when properly assembled. The hex body allows standard wrench engagement for controlled makeup. Licensed plumbers and pipefitters use this type of fitting when reducing branch connections, gauge ports, or instrument taps in gas and fluid distribution systems.

This bushing is suited for residential and light commercial piping applications involving natural gas, propane, steam, or water service where black iron fittings are specified. It is sold individually and is appropriate for new installation or maintenance work where a threaded size reduction is required at a valve, manifold, or appliance connection point. Each unit is flag tagged and individually inspected to confirm dimensional and thread compliance.

Key Features

• Black malleable iron construction per ANSI/ASTM A-197
• Hexagon body for full wrench engagement during installation
• 1/4-inch male NPT to 1/8-inch female NPT configuration
• Threads cut to ANSI B1.20.1 for consistent fit and seal
• Dimensions conform to ANSI/ASME B16.3, B16.14, and B16.39
• 100 percent inspected and quality tested at the factory

Compatibility

Designed as an OEM-style replacement or new-work fitting for black iron threaded pipe systems requiring a 1/4-inch male to 1/8-inch female NPT reduction.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Shut off and depressurize the affected line before disassembly or fitting makeup. Apply an approved pipe thread sealant or PTFE tape to the male threads per the applicable code — IFGC for gas systems, IPC for water and steam. Do not overtighten; use the hex body with a properly sized wrench and avoid pipe-wrench contact on the hex flats where possible to prevent deformation.

Technical Specifications

• Material: Black Malleable Iron
• Material Standard: ANSI/ASTM A-197
• Thread Standard: ANSI B1.20.1
• Dimensional Standard: ANSI/ASME B16.3, B16.14, B16.39
• Male Thread Size: 1/4 inch NPT
• Female Thread Size: 1/8 inch NPT
• Body Style: Hexagon
• Weight: 0.044 pounds
• Sold As: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-910HC