TIB 14-027 - Common Frame Fasteners Torque Specifications

Page 1 of 3

Technical Information Bulletin
14-027

Section
Frame - 14

Subject
Common Frame Fasteners Torque Specifications

Release Date
9/25/2020

Condition
Beginning in January 2020, all M10, M12, M16, and M20 frame fasteners will be the same depending on the plant. Torque specifications for these
fasteners are different from previous fasteners.

Chassis Affected
All Kenworth and Peterbilt chassis. Refer to the 11th digit of the VIN and the chart below for plant implementation dates.
Table 1 Production Implementation Dates
Plant location 11th digit of VIN Start date
St Therese

M

01/06/2020

Renton

R

07/06/2020

Denton

D

07/06/2020

Chillicothe

J

09/14/2020

Mexicali

F

11/09/2020

Action
Information Only
Refer to the information below for part numbers and torque specifications for the new fasteners.

Parts

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TIB 14-027 - Common Frame Fasteners Torque Specifications

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Parts are available from PACCAR Parts.
Part Number
W34-1163-XXX

Description
M10 bolt. Available in many lengths from 15 mm to 275 mm.
XXX= length of the bolt. 15 mm bolt=015, 275 mm bolt=275.
M12 bolt. Available in many lengths from 20 mm to 290 mm.

W34-1159-XXX

XXX= length of the bolt. 20 mm bolt=020, 290 mm bolt=290.
M16 bolt. Available in many lengths from 30 mm to 300 mm.

W34-1160-XXX

W34-1161-XXX

XXX= length of the bolt. 30mm bolt=030, 300 mm bolt=275.
M20 bolt. Available in many lengths from 40 mm to 300 mm.
XXX= length of the bolt. 40 mm bolt=040, 300 mm bolt=300.

W20-1028-XXX Nut, hex, locking, metric. XXX = size. 010=10 mm.
W34-1162-XXX Washer, Metric, Hard. XXX=size. 010=10 mm.

Procedure
PACCAR introduced new frame fasteners that are now common to all Kenworth and Peterbilt chassis.

CAUTION
Using old style nuts, bolts, or washers with new Common Frame fasteners will result in
incorrect torque values and clamp loads. This could cause a frame failure. Old style fastener
sets and new Common Frame fastener sets may be separately installed in the same frame,
but the sets cannot be mixed together. DO NOT use old style fasteners on Common
Fasteners and vice versa. Failure to comply may result in equipment or property damage.

NOTE
The new finish also affects torque values. Refer to the Torque Specification chart.

Characteristics of the Common Frame Fasteners
New finish is more resistant to salt spray, has better paint adhesion, and is RoHS compliant.
Do not lubricate these fasteners.
Bolts and washers can be reused, but nuts can only be reused once. If in doubt, install new nuts.
If a bolt must be replaced, then nuts and bolts must be replaced in pairs.
Fasteners must be torqued from the nut to achieve correct clamp load.
Old style bolts and the new Common Fasteners may be difficult to distinguish. If in doubt, replace the nut and bolt with new parts.
Old style nuts use a nylon locking feature. The new style Common Fastener nuts use a metal locking feature.
Bolts that were paired with a nylon locking feature cannot be used with the metal lock nuts.
Bolts paired with a metal lock nut cannot use a nut with a nylon locking feature.

Torque specifications for Common Frame Fasteners

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TIB 14-027 - Common Frame Fasteners Torque Specifications

Page 3 of 3

CAUTION
Incorrectly-tightened fasteners may break or fail to achieve the correct clamp load. Use a torque wrench for
final tightening of these fasteners. An impact gun may over-torque or break fasteners due to the coating on
the bolt threads. When torqueing, the nut must rotate slightly before achieving the torque value. If the nut
does not rotate, the fastener is over-torqued and must be replaced. Failure to comply may result in
equipment or property damage.

CAUTION
Incorrect clamp loads may cause unexpected frame movement or failure. The intended clamp load may not
be achieved if the nut is held and torque is applied to the bolt. To achieve correct clamp loads, the frame
fasteners must be torqued with the nut. Failure to comply may result in equipment or property damage.
Diameter

Recommended Torque Value

M10

29-41 lbs-ft (39.4-55.6 N·m)

M12

51-69 lbs-ft (69.1-93.5 N·m)

M16

125-165 lbs-ft (169.5-223.7 N·m)

M20

230-300 lbs-ft (311.8-406.8 N·m)

Authored by: OF

Access to PACCAR’s Enterprise Portal is provided as a benefit of doing business with PACCAR. All applications and content accessed through this system
are confidential and proprietary and the property of PACCAR Inc and its suppliers, and must be kept strictly confidential pursuant to the contract
licensing such access. Disclosure, publication, release or distribution of any material found on PACCAR systems to any person other than employees
with a need to know such information is strictly prohibited. All activity on this system is monitored. If PACCAR suspects or discovers any unauthorized
activity, access may be immediately terminated without prior notification. Violators may be subject to legal action.

© Copyright 2020 PACCAR Inc. All rights reserved. We welcome your feedback on this page. For technical questions or concerns about this page,
please contact the DealerNet Webmaster.

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14-027 Common Frame Fasteners and Torque Changes

Page 1 of 3

Service Bulletin
14-027

Section
14 - Frame

Description
PACCAR offers common frame fasteners on all Peterbilt and Kenworth vehicles. These common fasteners have different torque specifications than
previous fasteners.

Release Date
9/29/2020

Introduction
Introduction
In 2020, Peterbilt and Kenworth began using the same M10, M12, M16, and M20 frame fasteners on all vehicles.
Torque specifications for these fasteners are different from previous fasteners.
th
Refer to the 11 digit of the VIN and the chart below for vehicle manufacturing plant implementation dates.
Table 1 Production Implementation Dates

Plant location
St Therese
Chillicothe
Denton
Renton
Mexicali

11th digit of VIN
M
J
D
R
F

Start date
01/06/2020
09/14/2020
07/06/2020
07/06/2020
11/09/2020

Resolution
Information Only
Refer to the information below for part numbers and torque specifications for the new fasteners.

Warranty
Warranty does not apply, this is information only.

Parts
Parts are available from PACCAR Parts.

Part Number

Description

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14-027 Common Frame Fasteners and Torque Changes

W34-1163-XXX

W34-1159-XXX

W34-1160-XXX

W34-1161-XXX

W20-1028-XXX
W34-1162-XXX

Page 2 of 3

M10 bolt. Available in many lengths from 15 mm to 275
mm.
XXX= length of the bolt. 15 mm bolt=015, 275 mm
bolt=275.
M12 bolt. Available in many lengths from 20 mm to 290
mm.
XXX= length of the bolt. 20 mm bolt=020, 290 mm
bolt=290.
M16 bolt. Available in many lengths from 30 mm to 300
mm.
XXX= length of the bolt. 30mm bolt=030, 300 mm
bolt=275.
M20 bolt. Available in many lengths from 40 mm to 300
mm.
XXX= length of the bolt. 40 mm bolt=040, 300 mm
bolt=300.
Nut, hex, locking, metric. XXX = size. 010=10 mm.
Washer, Metric, Hard. XXX=size. 010=10 mm.

Procedure
PACCAR introduced new frame fasteners that are now common to all Peterbilt and Kenworth
chassis.

CAUTION
Using old style nuts, bolts, or washers with new Common Frame
fasteners will result in incorrect torque values and clamp loads. This
could cause a frame failure. Old style fastener sets and new Common
Frame fastener sets may be separately installed in the same frame, but
the sets cannot be mixed together. DO NOT use old style fasteners on
Common Fasteners and vice versa. Failure to comply may result in
equipment or property damage.

NOTE

The new finish also affects torque values. Refer to the Torque
Specification chart.

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14-027 Common Frame Fasteners and Torque Changes

Page 3 of 3

Characteristics of the Common Frame Fasteners
New finish is more resistant to salt spray, has better paint adhesion, and is RoHS compliant.
Do not lubricate these fasteners.
Bolts and washers can be reused, but nuts can only be reused once. If in doubt, install new nuts.
If a bolt must be replaced, then nuts and bolts must be replaced in pairs.
Fasteners must be torqued from the nut to achieve correct clamp load.
Old style bolts and the new Common Fasteners may be difficult to distinguish. If in doubt, replace the nut and
bolt with new parts.
Old style nuts use a nylon locking feature. The new style Common Fastener nuts use a metal locking feature.
Bolts that were paired with a nylon locking feature cannot be used with the metal lock nuts.
Bolts paired with a metal lock nut cannot use a nut with a nylon locking feature.
Torque specifications for Common Frame Fasteners
CAUTION
Incorrectly-tightened fasteners may break or fail to achieve the correct clamp load.
Use a torque wrench for final tightening of these fasteners. An impact gun may overtorque or break fasteners due to the coating on the bolt threads. When torqueing,
the nut must rotate slightly before achieving the torque value. If the nut does not
rotate, the fastener is over-torqued and must be replaced. Failure to comply may
result in equipment or property damage.

CAUTION
Incorrect clamp loads may cause unexpected frame movement or failure. The
intended clamp load may not be achieved if the nut is held and torque is applied to
the bolt. To achieve correct clamp loads, the frame fasteners must be torqued with
the nut. Failure to comply may result in equipment or property damage.

Diameter

Recommended Torque Value

M10

29-41 lbs-ft (39.4-55.6 N·m)

M12

51-69 lbs-ft (69.1-93.5 N·m)

M16

125-165 lbs-ft (169.5-223.7 N·m)

M20

230-300 lbs-ft (311.8-406.8 N·m)

Authored by: DKH

Access to PACCAR’s Enterprise Portal is provided as a benefit of doing business with PACCAR. All applications and content accessed through this
system are confidential and proprietary and the property of PACCAR Inc and its suppliers, and must be kept strictly confidential pursuant to the
contract licensing such access. Disclosure, publication, release or distribution of any material found on PACCAR systems to any person other
than employees with a need to know such information is strictly prohibited. All activity on this system is monitored. If PACCAR suspects or
discovers any unauthorized activity, access may be immediately terminated without prior notification. Violators may be subject to legal action.

© Copyright 2020 PACCAR Inc. All rights reserved. We welcome your feedback on this page. For technical questions or concerns about this
page, please contact the DealerNet Webmaster.

https://eportal.paccar.net/dealer/uspb/en/service/vehiclebulletins/vehiclefieldservice/Pages/... 10/1/2020