Product Description
1/4″ UNF A2 Stainless Steel Hexagon Head Bolts With Shank
These 1/4″ UNF hexagon head bolts are manufactured from A2 stainless steel and feature a partially threaded plain shank. They have a standard 1/4″-28 Unified National Fine thread and are available in imperial lengths from 1 1/4″ to 5″.
The fine 28 TPI thread provides a smaller thread pitch than 1/4″ UNC and allows finer adjustment during assembly. The unthreaded portion provides a plain bearing surface through the joint, making these bolts suitable for machinery, automotive work, restoration, fabrication and general engineering.
Product specification
- Nominal diameter: 1/4″
- Thread: 1/4″-28 UNF
- Thread pitch: 28 threads per inch
- Available lengths: 1 1/4″ to 5″
- Thread form: Unified National Fine
- Thread coverage: Part threaded with plain shank
- Expected standard thread length: Approximately 3/4″
- Head type: Hexagon head
- Spanner size: 7/16″ AF
- Nominal head height: Approximately 5/32″
- Material: A2 stainless steel
- Relevant dimensional standard: ASME B18.2.1 pattern, subject to supplier confirmation
- Thread standard: ASME B1.1
A2 stainless steel provides good corrosion resistance in many indoor and general outdoor environments without requiring an additional protective coating. A4 stainless steel is normally preferable for coastal, marine, swimming-pool and other chloride-rich environments.
Stainless-steel threads can be susceptible to galling during assembly. Use clean mating threads, an appropriate anti-seize compound and controlled installation speeds, particularly when fitting stainless bolts and nuts together.
Compatibility and technical information
Use only matching 1/4″-28 UNF nuts. These bolts are not interchangeable with 1/4″-20 UNC, 1/4″ Whitworth or metric M6 fasteners.
| A | B | C | D | E | F | G |
| 1/4" | 1 1/2" | 3/4" | 7/16" | 5/32" | 28 | 3/4" |
| 1/4" | 1 3/4" | 3/4" | 7/16" | 5/32" | 28 | 5/8" |
| 1/4" | 2 1/2" | 7/8" | 7/16" | 5/32" | 28 | 1 3/4" |
| 1/4" | 2" | 3/4" | 7/16" | 5/32" | 28 | 1/4" |
| 1/4" | 1 1/4" | 7/8" | 7/16" | 5/32" | 28 | 3/8" |
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Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
