Senco SN4 Parts

O-ring kit + seal LB3500 + BB0059

All the O-rings in the tool, Plus the seal LB3500 Plus the top piston bumper BB0059 which stops the bolt in the center of the driver from damaging the upper valve assembly BA0103.

Senco LB3500 + SN4/SN70 O-rings + BB0059
Senco LB3500 + SN4/SN70 O-rings + BB0059
Senco Seal LB3500 + O-ring Kit IN STOCK
For Nailer SN4 SNIV SN70
Available Qty: 2

O-ring kit + seal LB3500 + BB0059 + Bumper BB0018

This kit includes everything above Plus the lower bumper BB0018, this bumper is located at the bottom of the cylinder directly below the driver, looking down inside your gun it looks like a donut. You must remove the driver to see it.

SN4 SN70 O-ring kit + LB3500 + Bumper BB0018 + BB0059
SN4 SN70 O-ring kit + LB3500 + Bumper BB0018 + BB0059
SN4 & SN70 O-ring kit
+ Washer Firing Valve Seal LB3500
+ Bumper BB0018 + BB0059
Available Qty: 8

Firing Valve Washer LB3500

Located on the valve BA0103 located in the cap on top of the gun. These get brittle with age due to dry rot. When installed the beveled edge goes up towards the top of the gun. The seal is available from below.

Senco LB3500
Senco LB3500
IN STOCK Ships same Day or the Next
Senco Seal LB3500 installs on valve BA0103
For Nailer SNIII SN3 SN4 SNIV SN70
Available Qty: 22

Other parts available

Front nose springs, Senco part # BF0008 Lock Spring and BF0023 Upper Lock Spring, sold as a pair, they are used but in very good condition. These 2 spring latches hold the nose together.

Senco SNIV 4 Nose Springs FB0023 FB0008
Senco SNIV 4 Nose Springs FB0023 FB0008
USED Senco SN-IV SN4 Nose Springs
Sold as a set
Part # FB0023 and FB0008
Available Qty: 1

Senco SN4 SN70 Feeder Spring Kit

Senco SN4 Feeder Spring Kit YK0028
Senco SN4 Feeder Spring Kit YK0028
Senco SN4 SN70 Feeder Spring Kit YK0028
OEM Feeder Spring kit
For Senco Models SN4 SNIV SN70

Lower Bumper BB0018. Brand New polyurethane bumper. Goes at the bottom of the cylinder below the piston and driver. Every time the gun fires, the driver goes down at full force and strikes this bumper. It’s what keeps the driver from bottoming out, the driver hits it and rebounds back to the top.

Aftermarket for Senco SN4 SN70 Bumper BB0018
Aftermarket for Senco SN4 SN70 Bumper BB0018
Bumper / Piston Stop p/n BB0018
For Senco SN4 SN70 SN3 AST4 Framing Nailers.
Available Qty: 5

O-ring kit only, All the O-rings in the tool, No other parts or seals.

O-ring rebuild kit for Senco SNIV
O-ring rebuild kit for Senco SNIV
Complete O-ring rebuild kit for the Senco SN4
Includes schematic & O-ring reference sheet.
Available Qty: 14

Installing LB3500 Video on Youtube

Installing LB3500

https://youtu.be/NXOOhNHqiRs?si=2UajdUkh8xFuuSW2

SNIV and SN70 Identification

SNIV on the left, and SN70 on the right. Both use the same nails and share all the parts and kits available on this page.

Senco SNIV and SN70 Framing nailer identification pictures.

Senco SN4 Schematic Diagram Download

https://www.rebuild-kits.com/wp-content/uploads/SEN-SN4-NFD017.-7-99.pdf