Atlas Copco WTB / WTF Hydraulic Bolt Tensioner

Atlas Copco WTB / WTF Hydraulic Bolt Tensioner

The Atlas Copco WTB / WTF series is designed for controlled tensioning and tightening of large bolts in industrial assembly applications.

It covers multiple bolt sizes, with defined load, stroke and envelope dimensions so you can match the tensioner to the joint and installation constraints.

Key Features

• Wide bolt-size coverage: The series includes models for M30, M33, M36, M39, M42 and M45 bolts.
• Matched to load demand: Each model has its own maximum load, making it easier to select the right tensioner for the joint requirement.
• Defined working stroke: Every model has a specified maximum stroke, helping match the tool to stud protrusion and installation geometry.
• Built for different envelopes: The models differ in A, B and D dimensions as well as weight, so you can choose around space limits at the joint.
• Ease of operation: The series features Automatic Reset “Snap Down” Nut Drive.
• Accurate family selection: The model table makes it easy to compare the variants and select the right tensioner for bolt diameter and installation conditions.

Frequently Asked Questions

How do I choose the right WTB / WTF model?
Step 1: Identify the bolt or stud diameter.
Step 2: Check the available stud protrusion and the stroke you need.
Step 3: Compare the model’s maximum load with the joint requirement.
Step 4: Confirm the external dimensions and weight if the joint area has space limitations.

What bolt sizes does the series cover?
The series includes models for M30 through M45 bolts.

What should I check before ordering?
Check the bolt diameter, stud protrusion, maximum stroke and the space around the joint.
Matching those factors to the model helps avoid installation issues.

Are the models mechanically different from one another?
Yes.
The models differ in bolt diameter coverage, minimum and maximum stud protrusion, maximum load, A/B/D dimensions and weight.

What does Automatic Reset “Snap Down” Nut Drive mean?
It is an automatic-reset drive arrangement that helps streamline the working cycle and returns to position after use.

Where are hydraulic bolt tensioners like these used?
They are used in industrial assembly applications where controlled tightening of large, precise bolts is required.

What is included in the WTB / WTF family?
The family includes several model variants, and each one is defined for its own bolt size and load range.

ℹ️ Please note: this specification includes technical diagrams from the Atlas Copco catalog. The complete data and drawings are available in the PDF attached to this page (the “More details – PDF” button).

Atlas Copco WTB / WTF Hydraulic Bolt Tensioner – Specifications

	Model	Bolt Diameter	Stud Protrusion (Mm)		Max Stroke	Maximum Load		Hydraulic Pres­ sure Area		Dia A	Height B	D	Weight
Ordering No.		Metric	min	max	mm	kN	lbs	mm2	in2	mm	mm	mm	kg
8434220062	WTB30	M30	59	69	8	465.38	104622	3447.21	5.343	72	205	64	6.16
8434220063	WTB33	M33	64	73	10	575.80	129444	4265.09	6.611	79	217.5	71	7.24
8434220064	WTB36	M36	71	81	10	678.26	152478	5024.05	7.787	84.5	229.5	77	8.75
8434220065	WTB39	M39	76	86	10	810.58	182225	6004.20	9.307	92	263	83	11.12
8434220066	WTB42	M42	83	93	10	929.67	208999	6886.37	10.674	97	262.5	95	12.75
8434220067	WTB45	M45	88	98	10	1079.48	242682	7996.12	12.394	105	275.5	94.5	15.86
8434220068	WTB48	M48	94	104	10	1221.57	274620	9048.67	14.025	111	286.5	100.5	17.84
8434220350	WTB56	M56	110	120	10	1686.19	379070	12490.29	19.359	132	314	115	26.5
8434220351	WTB64	M64	124	134	10	2221.00	499300	16461.30	25.515	150	352	124	35

Technical diagram from the Atlas Copco catalog (p. 58)