diff --git a/tests/nuts.scad b/tests/nuts.scad
index 2498bf5..9b3be3e 100644
--- a/tests/nuts.scad
+++ b/tests/nuts.scad
@@ -22,13 +22,12 @@ use <../utils/layout.scad>
 include <../vitamins/screws.scad>
 
 module nuts() {
-    for(nyloc = [false, true])
-        translate([0, nyloc ? 20 : 0])
-            layout([for(n = nuts) 2 * nut_radius(n)], 5)
-                nut(nuts[$i], nyloc);
+    layout([for(n = nuts) 2 * nut_radius(n)], 5) let(n = nuts[$i]) {
+        for(nyloc = [false, true])
+            translate([0, nyloc ? 20 : 0])
+                nut(n, nyloc);
 
-    translate([0, 40])
-        layout([for(n = nuts) 2 * nut_radius(n)], 5) let(n = nuts[$i]) {
+        translate([0, 40]) {
             if(n == M3_nut)
                 nut(n, brass = true);
 
@@ -45,6 +44,26 @@ module nuts() {
             if(n == M8_nut)
                 #nut_trap(M8_cap_screw, n, h = 30);
         }
+
+        translate([0, 60]) {
+            if(n == M3_nut)
+                sliding_t_nut(M3_sliding_t_nut);
+
+            if(n == M4_nut)
+                sliding_t_nut(M4_sliding_t_nut);
+
+            if(n == M5_nut)
+                sliding_t_nut(M5_sliding_t_nut);
+        }
+
+        translate([0, 80]) {
+            if(n == M3_nut)
+                hammer_nut(M3_hammer_nut);
+
+            if(n == M4_nut)
+                hammer_nut(M4_hammer_nut);
+       }
+    }
 }
 
 if($preview)
diff --git a/vitamins/nut.scad b/vitamins/nut.scad
index 39a6bb2..df60c6e 100644
--- a/vitamins/nut.scad
+++ b/vitamins/nut.scad
@@ -25,6 +25,7 @@
 include <../core.scad>
 use <washer.scad>
 use <screw.scad>
+use <../utils/fillet.scad>
 use <../utils/rounded_cylinder.scad>
 use <../utils/thread.scad>
 use <../utils/tube.scad>
@@ -129,6 +130,75 @@ module wingnut(type) { //! Draw a wingnut
             female_metric_thread(thread_d, metric_coarse_pitch(thread_d), thickness, center = false, colour = colour);
     }
 }
+
+module sliding_t_nut(type) {
+    vitamin(str("sliding_t_nut(", type[0], "): Nut M", nut_size(type), " sliding T"));
+
+    size = [type[7], type[2], nut_thickness(type)];
+    tabSizeY1 = type[8];
+    tabSizeY2 = type[9];
+    tabSizeZ = type[10];
+    holeRadius  = nut_size(type) / 2;
+
+    if($preview)
+        color(grey80)
+            extrusionSlidingNut(size, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius);
+
+}
+
+module hammer_nut(type) {
+    vitamin(str("hammer_nut(", type[0], "): Nut M", nut_size(type), " hammer"));
+
+    size = [type[7], type[2], nut_thickness(type)];
+    tabSizeY1 = type[8];
+    tabSizeY2 = type[9];
+    tabSizeZ = type[10];
+    holeRadius  = nut_size(type) / 2;
+
+    if($preview)
+        color(grey80)
+            extrusionSlidingNut(size, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius, 0, hammerNut = true);
+
+}
+
+module extrusionSlidingNut(size, tabSizeY1, tabSizeY2, tabSizeZ, holeRadius, holeOffset = 0, hammerNut = false) {
+    // center section
+    linear_extrude(size[2] - tabSizeZ)
+        difference() {
+            square([size[0], size[1]], center = true);
+            if(hammerNut) {
+                translate([size[0] / 2, size[1] / 2])
+                    rotate(180)
+                        fillet(1);
+                translate([-size[0] / 2, -size[1] / 2])
+                    fillet(1);
+            }
+            if(holeRadius)
+                translate([holeOffset, 0])
+                    circle(holeRadius);
+        }
+    translate_z(size[2] - tabSizeZ)
+        linear_extrude(tabSizeZ)
+            difference() {
+                square([size[0], tabSizeY2], center = true);
+                if(holeRadius)
+                    translate([holeOffset, 0])
+                        circle(holeRadius);
+            }
+
+    // add the side tabs
+    for(m = [0, 1])
+        mirror([0, m, 0])
+            translate([0, tabSizeY2 / 2, size[2] - tabSizeZ]) {
+                cubeZ = 1;
+                translate([-size[0] / 2, 0, 0])
+                    cube([size[0], (tabSizeY1 - tabSizeY2) / 2, cubeZ]);
+                translate_z(cubeZ)
+                    rotate([0, -90, 0])
+                        right_triangle(tabSizeZ - cubeZ, (tabSizeY1 - tabSizeY2) / 2, size[0], center = true);
+            }
+}
+
 function nut_trap_radius(nut, horizontal = false) = nut_radius(nut) + (horizontal ? layer_height / 4 : 0); //! Radius across the corners of a nut trap
 function nut_trap_flat_radius(nut, horizontal = false) = nut_trap_radius(nut, horizontal) * cos(30);       //! Radius across the flats of a nut trap
 
diff --git a/vitamins/nuts.scad b/vitamins/nuts.scad
index 6de2459..4e6ff62 100644
--- a/vitamins/nuts.scad
+++ b/vitamins/nuts.scad
@@ -51,6 +51,13 @@ toggle_nut  = ["toggle_nut",  6.1, 9.2, 1.5, 1.5,  M6_washer,     1.5];
 
 M4_wingnut  = ["M4_wingnut",  4,  10,   3.75,8,    M4_washer,     0, 22, 10, 6, 3];
 
+//                                                                          sx  ty1 ty2 tz
+M3_sliding_t_nut = ["M3_sliding_t_nut", 3, 6, 4.0, 0,    M3_washer,     0,  10,  10,  6, 3];
+M4_sliding_t_nut = ["M4_sliding_t_nut", 4, 6, 4.5, 0,    M4_washer,     0,  11,  10,  6, 3.25];
+M5_sliding_t_nut = ["M5_sliding_t_nut", 5, 6, 4.5, 0,    M5_washer,     0,  11,  10,  7, 3.25];
+M3_hammer_nut =    ["M3_hammer_nut",    3, 6, 4.0, 0,    M3_washer,     0, 5.5,  10,  6, 2.75];
+M4_hammer_nut =    ["M4_hammer_nut",    4, 6, 4.5, 0,    M4_washer,     0, 5.5,  10,  6, 3.25];
+
 nuts = [M2_nut, M2p5_nut, M3_nut, M4_nut, M5_nut, M6_nut, M8_nut];
 
 use <nut.scad>