What sizes does this cover?

The Socket & Wrench Size pack covers standard metric hex bolts from M3 to M36 and imperial hex bolts from 1/4" to 1-1/2". These are the most common sizes in hardware stores and automotive work.

Are these sizes guaranteed correct?

Sizes are based on ISO and SAE standards for standard hex head bolts and nuts. Actual fasteners vary by manufacturer, grade, and application. Always verify with the fastener when precision matters.

What about Torx, spline, or specialty fasteners?

This tool covers hex head fasteners only. Torx, spline, 12-point, and other drive types are not yet supported.

Can I use the nearest imperial socket on a metric bolt?

In a pinch it may work, but risks rounding the fastener head. Use the correct socket whenever possible. Related values shown are for reference, not substitution.

Will more packs be added?

Yes. Pilot Hole, Tap Drill, and Metric/Imperial conversion packs are planned. The architecture supports new reference sets without changing the app.

1-3/8" Bolt — 2-1/16" Socket/Wrench

The standard socket size for a 1-3/8" hex bolt is 2-1/16". Nearest metric equivalent: 52mm.

Result

Answer

2-1/16" socket/wrench

Common

Buy2-1/16" socket SAE socket set Pro SAE set

Wrench/Socket Size2-1/16"

Size in mm52.4mm

Nearest Metric Socket52mm

Bolt SystemImperial (SAE)

A standard 1-3/8" hex bolt or nut uses a 2-1/16" wrench or socket (52.4mm). The nearest metric equivalent is a 52mm socket.

Note

Less common bolt size. Verify before purchasing specialty sockets.

Related Sizes

← 1-1/4" → 1-7/8"1-1/2" → 2-1/4" →

About 1-3/8" Bolts

A 1-3/8" hex bolt requires a 2-1/16" socket or wrench (52.4mm). This is a less common imperial size, typically found in heavy equipment and industrial applications. The nearest metric socket is 52mm. For best results, always use the correct 2-1/16" socket to avoid rounding the fastener head.

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