HB-DB SERIES · HEX REDUCER BUSHING

Reducer Bushing

Name: Reducer Bushing (Impact Socket Adapter)
Brand: Hydro Bard
SKU: HB-DB

Makes your larger impact and pneumatic sockets usable with the smaller nut and bolt sizes on hand. Our HB-DB series reducer bushings are CNC-machined to precision from material suited to high-torque applications, in 25 standard input sizes from 36-155 mm; custom intermediate sizes are also available on request. In the industry, this part is also known as an impact socket adapter or reduction bushing.

Get a Quote View Size Table User Manual (PDF) ↓

Input Size Range36–155mm

Standard Models25models

Fixed Cap Thickness (S)5mm

Custom Intermediate SizeCustomsize

Model and Size Table

The table below lists all standard sizes for the HB-DB series reducer bushings, based on the input, maximum output, H, and S dimensions from the BlackIron reference 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 produced on custom order — 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.

Technical Specifications

Input Hex Size (A)

36 mm – 155 mm, 25 standard steps

Output Hex Size (B)

Stepped, maximum producible output based on input size (see size table)

Body Height (H)

25 mm – 80 mm, varies by size

Cap Thickness (S)

5 mm (fixed across all models)

Material

Special steel suited to high-torque applications

Manufacturing Method

CNC precision machining

Custom Size Production

Intermediate sizes below the maximum output size in the table can be produced on request

Why Hydro Bard Reducer Bushing?

One Socket, Multiple Sizes

Instead of buying a separate socket for every nut size, adapt the large socket you already have to smaller sizes with a reducer bushing.

High Torque Resistance

Material selection and CNC machining built to withstand the demanding loads of impact and pneumatic torque applications.

25 Standard Sizes

Stocked and production-ready options across a wide input size range from 36 mm to 155 mm.

Custom Intermediate Sizes

Custom intermediate sizes below the maximum output size in the table are produced to your request.

Fixed Cap Thickness

A 5 mm cap thickness across all models ensures consistent strength and a secure seat.

Fast Delivery

Standard sizes ship from stock; custom sizes reach the field with a short production lead time.

Where Is It Used?

Energy & Petrochemical Plants Quickly switch between different nut sizes on flange and pipe connections.Flange & pipe connection maintenance

Wind Turbine Maintenance Work tower flange bolts of varying sizes with a single socket set.Tower flange maintenance

Heavy Machinery & Equipment Maintenance Tightening various nut sizes on chassis and axle connections.Field & shutdown maintenance

Steel Structure & Bridge Erection Flexible socket use on large structural bolts.Structural erection

Shipbuilding & Port Equipment Maintaining fasteners built to withstand marine environments.Marine environment maintenance

Frequently Asked Questions About Reducer Bushings

What does a reducer bushing do?

A reducer bushing fits inside a larger impact or pneumatic socket, letting you tighten a smaller nut or bolt with the socket you already own. This means you don't need to buy a separate socket for every size.

Which input and output sizes are available?

The HB-DB series is produced in 25 standard input sizes from 36 mm to 155 mm. For each input size, intermediate sizes below the maximum output size listed in the table can also be produced on custom order.

What material is the reducer bushing made from?

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

Can I order a custom size?

Yes. Intermediate sizes below the maximum output size listed in the table (for example 60→55, 60→50, 60→46, or 60→41 mm) can be produced to your request.

How do I determine the order code?

For standard sizes, the product code is based on the input size (e.g. HB-DB-060). For custom intermediate sizes, the code includes both the input and output sizes; for example, a bushing reducing a 60 mm input to a 50 mm output is coded HB-DB-60-50.

Why does cap thickness (S) matter?

Cap thickness determines the strength of the bushing's seating surface inside the socket. The HB-DB series uses a fixed 5 mm cap thickness across all sizes, which delivers consistent strength and seating performance.

Is a reducer bushing the same product as an impact socket adapter?

Yes. In the industry, the terms reducer bushing, impact socket adapter, and reduction bushing are used interchangeably for this part; they all describe the same product that adapts a larger socket for use with a smaller nut size.