Historical clue formulations

• Bit of letter-shaped hardware — 2025-12-07
• Letter-shaped fastener — 2025-08-13
• Fastener used in securing pipes — 2024-06-11
• Many a bike lock, essentially — 2019-08-07
• Letter-shaped fastener — 2019-07-08
• *Military vehicles — 2018-07-19
• It takes two nuts — 2014-04-25
• Curved connector — 2013-08-04
• Fastener with two nuts — 2013-07-07
• Horseshoe-shaped fastener — 2012-03-21
• Letter-shaped, threaded fastener — 2009-10-26
• Curved fastener — 2009-04-15
• Nut holder — 2008-05-04
• Letter-shaped fastener — 2007-09-12
• Letter-shaped fastener — 2006-04-25
• It has a nut on each end — 2005-11-27
• Bar with two screw threads — 2005-03-06
• Letter-shaped fastener — 2005-03-02
• Letter-shaped fastener — 2004-10-10
• Fastener — 2004-05-06
• Letter-shaped hardware — 2003-11-20
• Letter-shaped fastener — 2003-10-29
• It takes two nuts — 2003-05-28
• Axle securer — 2000-11-26
• Carpenter's double-nutter — 1995-11-01