268 | Firestone Imperial Air Spring

Name: 268 | Firestone Imperial Air Spring
Brand: Firestone
SKU: 139723686
Rating: 5.0 (71 reviews)

Firestone Imperial Air Spring Style 268

Style: 268 (Two Ply Bellows):	Blind nuts, 1/4 NPT air inlet Blind nuts, 3/4 NPT air inlet Blind nuts, 1/4 NPT air inlet both ends 3/4 NPT air inlet both ends (no blind nuts) Socket head aluminum bead rings (bolts, nuts, washers not included, use cap screws) 3/4 NPT air inlet (only) upper plate, blind nuts lower plate Rubber bellows only
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Details

Brand

Firestone

Article Status

Normal

Bellows Style

268 (Replacement for Style 25)

New Bellows Style

268C

HS Code

8708809000

Material of Upper Plate

9 gauge carbon steel, 0.149" in thickness (Zinc/chromate plated for rust protection)

Material of Lower Plate

9 gauge carbon steel, 0.149" in thickness (Zinc/chromate plated for rust protection)

Air Inlet

1/4 NPT or 3/4 NPT

Medium

Compressed air

Place of Origin

USA

Application

Industrial equipment

Assembly Weight (bead plate version)

3.2 lbs

1.45 kg

Force to Collapse to Minimum Height (@ 0 PSIG)

30 lbs

13.61 kg

Dynamic Characteristics

Dynamic Characteristics at Design Height (Required for Airmount™ isolator design only)
Volume @ 100 PSIG = 86 in3			Natural Frequency
Gauge Pressure (PSIG)	Load (lbs.)	Spring Rate (lbs./in.)	Natural Frequency
Gauge Pressure (PSIG)	Load (lbs.)	Spring Rate (lbs./in.)	f (CPM)	f (Hz)
40	515	339	153	2.54
60	787	482	147	2.45
80	1062	634	145	2.42
100	1360	773	141	2.36
Recommended Airmount™ Isolator Design Height: 5.5 in.

Force Table

Force Table (Use for Airstroke™ actuator design)
Assembly Height (in.)	Volume @ 100 PSIG (in3)	Force (lbs.)
Assembly Height (in.)	Volume @ 100 PSIG (in3)	@ 20 PSIG	@ 40 PSIG	@ 60 PSIG	@ 80 PSIG	@ 100 PSIG
5.0	78	300	590	890	1210	1540
4.0	60	380	720	1080	1450	1810
3.0	39	420	800	1220	1640	2060