_15% differential paid for all 2nd shift positions. _. . . Who is Senior Metal Bellows. Senior Metal Bellows continues to refine and develop welded metal bellows technology and the integration of welded metal bellows into critical aerospace, semiconductor, medical, defense, and industrial applications. Our 115,000 square-foot manufacturing facility is conveniently located on Route 1 in Sharon, Massachusetts. We have demonstrated excellence in cre...