Reducer Bushing Selection: 36–155mm Input/Output

When Does a Reducer Bushing Help You?

When the large socket you have doesn't match the nut size you needWhen you want to use one large socket across many sizes instead of buying a separate socket for each

In flange/pipe connection maintenance at power and petrochemical plantsWhen you need to switch quickly between different nut sizes

In wind turbine tower flange maintenanceWhen you need to work across varying sizes with a single socket set

In heavy machinery and construction equipment maintenanceWhen various nut sizes are being tightened on chassis and axle connections

In steel structure and bridge assemblyWhen flexible socket use is needed for large structural bolts

HB-DB Series Input/Output Size Table

Product Code	Input Hex Size A (mm)	Max. Output Hex Size B (mm)	H (mm)	S (mm)
HB-DB-036	36	32	25	5
HB-DB-041	41	36	25	5
HB-DB-046	46	41	25	5
HB-DB-050	50	46	28	5
HB-DB-055	55	50	35	5
HB-DB-060	60	55	35	5
HB-DB-065	65	60	35	5
HB-DB-070	70	65	40	5
HB-DB-075	75	70	40	5
HB-DB-080	80	75	40	5
HB-DB-085	85	80	40	5
HB-DB-090	90	85	50	5
HB-DB-095	95	90	50	5
HB-DB-100	100	95	55	5
HB-DB-105	105	100	55	5
HB-DB-110	110	105	65	5
HB-DB-115	115	110	65	5
HB-DB-120	120	115	75	5
HB-DB-125	125	120	75	5
HB-DB-130	130	125	80	5
HB-DB-135	135	130	80	5
HB-DB-140	140	135	80	5
HB-DB-145	145	140	80	5
HB-DB-150	150	145	80	5
HB-DB-155	155	150	80	5

* Column B shows the maximum output size that can be produced for the given input size. Smaller intermediate sizes can be custom-ordered — for example, bushings reducing a 60 mm input to 55, 50, 46, or 41 mm output use the codes HB-DB-60-55, HB-DB-60-50, HB-DB-60-46, and HB-DB-60-41 respectively.

Find the Right Model in 4 Steps

Determine your socket's input size

Identify the internal hex input size (mm) of the impact socket you're using — this determines the A (input) size of the reducer bushing you need.

Measure the nut's wrench flat

Measure the flat-to-flat width of the nut or bolt head you'll be tightening, in millimeters — this is your target output size.

Find the matching model in the table

Check the maximum output (B) value corresponding to your input size; the output size you need must be equal to or smaller than this value.

Request a custom size if needed

If the table doesn't have an exact intermediate size, order a custom size using the input-output code system (e.g., HB-DB-60-46).

// QUICK CHECKLIST

01Socket's input size (A) determined

02Nut's wrench flat (mm) measured

03Matching maximum output (B) value checked in the table

04If no standard size fits, custom code order confirmed

If you have your measurements ready, send them via the quote form — we'll confirm the right model together.

One Socket, Multiple Sizes

Instead of buying a separate socket for every nut size, adapting the large socket you already have with a reducer bushing cuts both inventory load and field equipment weight. The HB-DB series is CNC-machined to precision from a special steel selected to withstand the demanding loads of pneumatic and impact torque applications. 25 standard input sizes from 36 mm to 155 mm are stocked and ready for production; custom intermediate sizes below the table's maximum output size can also be produced on request. A fixed 5 mm cap thickness across all models ensures consistent strength and a secure seat on the bushing's seating surface inside the socket. Standard sizes ship from stock; custom sizes reach the field with a short production lead time.

Frequently Asked Questions

How do I correctly match the input (A) and output (B) size?

The internal hex input size of the impact socket you're using must match the reducer bushing's A (input) size. The wrench-flat size of the nut or bolt you'll tighten must match the bushing's B (output) size — check the maximum B value corresponding to your input size in the size table.

What if I can't find an exact matching intermediate size in the table?

Intermediate sizes below the table's maximum output size can be produced as a custom order — for example, bushings reducing a 60 mm input to 55, 50, 46, or 41 mm output are ordered with the codes HB-DB-60-55, HB-DB-60-50, HB-DB-60-46, and HB-DB-60-41.

Are a reducer bushing and an impact socket adapter the same product?

Yes. In the industry, the names reducer bushing, impact socket adapter, and reduction bushing are used interchangeably for this part; they all describe the same product that makes a large socket usable on a smaller nut size.

Why is the cap thickness (S) the same across all sizes?

The HB-DB series uses a fixed 5 mm cap thickness across all sizes; this ensures consistent strength and a secure seat on the bushing's seating surface inside the socket.

What material is the reducer bushing made from, and how is its torque resistance?

It's CNC-precision-machined from an impact-resistant special steel suited to high-torque applications.

How to Choose the Right Reducer Bushing?