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Watson

Flat Mount (FM) Series

Specifications

  • Seals: Buna N (Viton optional)
  • Temperature: Buna N seals: -25ºF to 220ºF (Viton: -15ºF to 400ºF)
  • Operating pressure to 125psi
  • Piston rods are stainless steel
  • Rod bearings are 660 bronze. Length = 2 times rod diameter
  • Cylinder bodies are brass, optional electroless nickel plating

Cylinder Selection Guide

Single Acting

Single Acting, Spring Return, Rear Port

Bore Size Part Number
1/4 FM2RRO+ 1/4
3/8 FM3RRO + stroke
1/2 FM5RRO + stroke

Single Acting, Spring Return, Rear Side Port

Bore Size Part Number
1/4 FM2RBO + 1/4
3/8 FM3RSO + stroke
1/2 FM5SRO + stroke

Single Acting, Spring Extend, Front Side Port

Bore Size Part Number
1/4 FM2EOB + 1/4
3/8 FM3EOS + stroke

 

Double Acting

Double Acting, Rear Port, and Front Side Port

Bore Size Part Number
1/4 FM2DRB + stroke
3/8 FM3DRS + stroke
1/2 FM5DRS + stroke

Double Acting, Both Side Port

Bore Size Part Number
1/4 FM2DBB + stroke
3/8 FM3DSS + stroke
1/2 FM5DSS + stroke

 

Dimensions
Bore
1/4
3/8
1/2
STROKE
1/4
1/2
1/4
1/2
1/4
1/2
A1
1.06
1.31
1.25
1.50
1.31
1.56
B
6-32
6-32
8-32
8-32
1/4-28
1/4-28
C
0.37
0.37
0.37
0.37
0.37
0.37
D
0.12
0.12
0.15
0.15
0.15
0.15
E
0.8
1.06
0.93
1.18
1.00
1.25
F
9/64
9/64
9/64
9/64
9/64
9/64
G
7/16
7/16
5/8
5/8
3/4
3/4
H
0.10
--
0.18
0.18
--
--
I
0.31
0.31
0.37
0.37
0.37
0.37
J
3/8
3/8
1/2
1/2
5/8
5/8
K
5/8
5/8
3/4
3/4
7/8
7/8
L
0.15
0.15
0.15
0.15
0.15
0.15

 

Dimensions for Cylinders with Strokes over 1/2"
Bore
1/4
3/8
1/2
A2
0.81 + Stroke
1.00 + Stroke
1.06 + Stroke

 

Single Acting Stroke Availability

1/4" Bore = 1/4" Stroke, only
3/8” Bore = 1/4" or 1/2" stroke
1/2" Bore = 1/4" or 1/2" stroke

Double Acting Stroke Availability

1/4" Bore = Up to 1”* stroke
3/8” Bore = Up to 2”* stroke
1/2" Bore = Up to 2”* stroke

*1/4” increments